Auxiliary hearing device

Abstract

The invention provides an auxiliary hearing device. The auxiliary hearing device comprises an automatic switching circuit, an automatic gain pre-amplification circuit, a sound path amplification circuit, a single-chip microcomputer, a volume adjustment and power amplification circuit and N microphones, the automatic conversion circuit connects the N microphones with the automatic gain pre-amplification circuit in different time periods, and transmits audio signals of the microphones to the automatic gain pre-amplification circuit; the automatic gain pre-amplification circuit processes the audio signal, so that the intensity of the audio signal is within a preset intensity range, and the audio signal is transmitted to the sound path amplification circuit; the single chip microcomputer sends an amplification instruction to the sound path amplification circuit; the sound path amplification circuit divides the audio signal into a plurality of sound paths according to frequency bands; the audio signals of each sound path are amplified according to the amplification instruction and then transmitted to the volume adjustment and power amplification circuit; and the volume adjustment and power amplification circuit adjusts the volume of the audio signal according to the adjustment instruction and outputs the sound. The application can effectively improve the sound quality of hearing and audio signals.

Description

Technical Field

[0001] The present application relates to the technical field of hearing assistance, and in particular to an assistive hearing device. Background Art

[0002] Hearing aids are classified as Class II medical devices, which have very strict requirements on human safety, hygiene, environmental protection of materials, product quality, and medical clinical trials. Therefore, there are extremely strict review and regulatory conditions for the production and sales licenses of hearing aid products. In the medical diagnosis, medical testing, and fitting and adjustment of hearing aids, there are also strict medical and product technical specifications, which has formed a high threshold for the entry and use of hearing aids.

[0003] Hearing aids are devices that span the two disciplines of medicine and physics, and are synthesized through very complex micromechanics, microelectronics, and special acoustic technologies, thus forming a high technical threshold from research and development to production. In addition, hearing aids also involve the cost of medical diagnosis and medical testing equipment, the cost of hearing aid fitting and debugging instruments, and the cost of hearing aid fitters, which results in high costs and high prices for hearing aids, resulting in a common phenomenon that hearing-impaired patients cannot afford them, research and development and production manufacturers have low profits, and the popularity of hearing aids is low.

[0004] In order to solve the above problems, the model of over-the-counter drugs has led to the emergence of over-the-counter hearing aids. Over-the-counter hearing aids are called hearing aids, which are personal sound amplifiers. The hearing aid provides a cheap and convenient new hearing aid for patients with hearing impairments. It also simplifies the approval (inspection) procedures for the production, sale, and use of traditional hearing aids. In addition, it also reflects the flexibility and practicality of the government's management system for medical device products. However, in actual applications, although hearing aids have brought benefits to patients with moderate and mild hearing impairments, there are also cases where hearing-impaired patients are harmed. For example, some hearing aids in the prior art overemphasize the amplification effect of the hearing aid, which leads to self-excitation of the circuit, emitting a whistling sound, stimulating the auditory nerves of patients with hearing impairments, and causing harm. In addition, when using hearing aids or auxiliary hearing devices, the hearing-impaired patients cannot hear the sound, which is not only related to their hearing loss, but also related to the frequency range of the sound amplified by the hearing aids or auxiliary hearing devices; the hearing-impaired patients cannot hear the sound content clearly, which is not only related to the hearing-impaired patients' reduced resolution of language, but also related to the hearing aids or auxiliary hearing devices' processing methods for multiple overtones and harmonics above the fundamental frequency of the sound. Summary of the invention

[0005] In view of this, the present invention provides an assistive hearing device, which can effectively improve the sound quality of audio signals and enhance the user experience.

[0006] The technical solution of this application is specifically implemented as follows:

[0007] The present application provides an assistive hearing device, which includes: an automatic conversion circuit, an automatic gain preamplifier circuit, a sound path amplifier circuit, a single-chip microcomputer, a volume adjustment and power amplifier circuit, and N microphones; wherein N is an integer greater than or equal to;

[0008] The automatic conversion circuit is used to connect the N microphones to the automatic gain preamplifier circuit respectively in different time periods, and transmit the audio signals received by each microphone in the time period when it is connected to the automatic gain preamplifier circuit;

[0009] The automatic gain preamplifier circuit is used to process the received audio signal so that the intensity of the processed audio signal is within a preset intensity range, and transmit the processed audio signal to the sound path amplifier circuit;

[0010] The single chip microcomputer is used to send an amplification instruction to the sound path amplification circuit, wherein the amplification instruction includes amplification factor information corresponding to multiple sound paths;

[0011] The sound path amplification circuit is used to divide the received audio signal into multiple sound paths according to the frequency band; according to the received amplification instruction, the audio signal of each sound path is amplified respectively, and the amplified audio signal of each sound path is transmitted to the volume adjustment and power amplification circuit;

[0012] The volume adjustment and power amplification circuit is used to adjust the volume of the received audio signal according to the received adjustment instruction, and output the adjusted audio signal.

[0013] As can be seen from the above, in the assistive hearing device of the present invention, since the automatic switching circuit is connected to N microphones in time periods, and the audio signals received when each microphone is connected to the automatic switching circuit are transmitted to the automatic gain preamplifier circuit, the N microphones can be used cyclically in each time period to cyclically switch each sound path, thereby effectively suppressing howling; in addition, since the audio signal can be processed by the automatic gain preamplifier circuit so that the intensity of the processed audio signal is within a preset intensity range (for example, about 25 decibels), and then the audio signal is divided into multiple sound paths according to the frequency band by the sound path amplification circuit, and the audio signal of each sound path is amplified according to different amplification factors according to the amplification instruction sent by the single-chip microcomputer, so that the audio signal within the user's auditory frequency range can be effectively amplified, and other noise signals can be effectively suppressed, so that the user can more easily hear the sound content in the audio signal, and can also effectively improve the hearing and the sound quality of the audio signal to enhance the user's experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an assistive hearing device in a specific embodiment of the present application.

[0015] Figure 2 The structure of the automatic switching circuit in a specific embodiment of the present application is shown in FIG. Figure 1 .

[0016] Figure 3 The structure of the automatic switching circuit in a specific embodiment of the present application is shown in FIG. Figure 2 .

[0017] Figure 4 It is a schematic diagram of the structure of an automatic gain preamplifier circuit in a specific embodiment of the present application.

[0018] Figure 5 It is a schematic diagram of the structure of a fourth chip IC4 in a specific embodiment of the present application.

[0019] Figure 6 It is a schematic diagram of the structure of the fifth chip IC5 in a specific embodiment of the present application.

[0020] Figure 7 It is a structural schematic diagram of a sound path amplifier circuit in a specific embodiment of the present application.

[0021] Figure 8 It is a schematic diagram of the structure of a multi-order active bandpass filter in a specific embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 FIG. 1 is a schematic diagram of the structure of an assistive hearing device in an embodiment of the present invention. Figure 1 As shown, the assistive hearing device in the embodiment of the present invention includes: an automatic conversion circuit 101, an automatic gain preamplifier circuit 102, a sound path amplifier circuit 103, a single chip computer 104, a volume adjustment and power amplifier circuit 105 and N microphones 106; wherein N is an integer greater than or equal to 2;

[0024] The automatic conversion circuit 101 is used to connect the N microphones 106 to the automatic gain preamplifier circuit 102 in different time periods, and transmit the audio signal received by each microphone 106 in the time period when it is connected to the automatic gain preamplifier circuit 102;

[0025] The automatic gain preamplifier circuit 102 is used to process the received audio signal so that the intensity of the processed audio signal is within a preset intensity range, and transmit the processed audio signal to the sound path amplifier circuit 103;

[0026] The single chip computer 104 is used to send an amplification instruction to the sound path amplification circuit 103, wherein the amplification instruction includes amplification factor information corresponding to multiple sound paths;

[0027] The sound path amplification circuit 103 is used to divide the received audio signal into multiple sound paths according to the frequency band; according to the received amplification instruction, the audio signal of each sound path is amplified respectively, and the amplified audio signal of each sound path is transmitted to the volume adjustment and power amplification circuit 105;

[0028] The volume adjustment and power amplification circuit 105 is used to adjust the volume of the received audio signal according to the received adjustment instruction, and output the adjusted audio signal.

[0029] In the above-mentioned assistive hearing device of the present application, since the automatic conversion circuit is connected to N microphones in time periods, and the audio signals received when each microphone is connected to the automatic conversion circuit are transmitted to the automatic gain preamplifier circuit, the N microphones can be used cyclically in each time period to cyclically switch each sound path, so as to avoid repeated positive feedback of sound waves input from the microphone and then reflected back to the microphone after being output through subsequent circuits such as the automatic gain preamplifier circuit, the sound path amplifier circuit, the volume adjustment and power amplifier circuit, etc., so that the electronic amplification circuit lacks the necessary conditions for generating "circuit feedback", that is, the phase condition and the oscillation amplitude, which are the two basic elements for generating feedback sound, are lacking, so that the sound waves no longer have the conditions for self-excitation in the electronic amplification circuit, so that the howling can be effectively suppressed. Therefore, the assistive hearing device in the present application is actually a howling-free assistive hearing device (which can be called an optimal hearing device).

[0030] In addition, in the above-mentioned assistive hearing device of the present application, since the audio signal can be processed by the automatic gain preamplifier circuit so that the intensity of the processed audio signal is within the preset intensity range (for example, about 25 decibels), and then the audio signal is divided into multiple sound paths according to the frequency band through the sound path amplification circuit, and the audio signal of each sound path is amplified according to different amplification factors according to the amplification instruction sent by the single-chip microcomputer, so that the audio signal within the user's auditory frequency range can be effectively amplified, and other noise signals can be effectively suppressed, so that the user can hear the sound content in the audio signal more easily, and the sound quality of the audio signal can be effectively improved to enhance the user's experience.

[0031] In addition, in the technical solution of the present application, the above-mentioned assistive hearing device can be implemented through a variety of specific implementation methods. The following will take several specific methods as examples to introduce the technical solution of the present application in detail.

[0032] In the technical solution of the present application, the number of the above-mentioned microphones, that is, the value of N, can be preset according to the needs of the actual application scenario.

[0033] For example, as an example, in a preferred specific embodiment of the present application, the value of N can be 2, 3, 4 or 5, or other suitable values, which are not listed here one by one.

[0034] When the N microphones are used, a cycle can be divided into multiple time periods of the same length (or different lengths), and the N microphones are connected to the automatic conversion circuit in turn in different time periods through the automatic conversion circuit, so that only one microphone is connected to the automatic conversion circuit in each time period, so that the audio signal received by the microphone connected in the time period can be transmitted to the automatic gain preamplifier circuit. In other words, the N microphones can be used cyclically in each time period in a cycle, so that they can be cyclically switched in different sound paths to effectively suppress howling.

[0035] For example, when the value of N is 2, that is, two microphones are set, a cycle period (for example, 1 second) can be divided into four time periods of equal length (for example, the length of each time period can be 250 milliseconds). In the first time period, the first microphone is connected to the automatic conversion circuit; in the second time period, the second microphone is connected to the automatic conversion circuit; in the third time period, the first microphone is connected to the automatic conversion circuit; in the fourth time period, the second microphone is connected to the automatic conversion circuit.

[0036] For another example, when the value of N is 3, that is, 3 microphones are set, a cycle period (for example, 1 second) can also be divided into 4 time periods of equal length (for example, the length of each time period can be 250 milliseconds). In the first time period, the first microphone MIC1 is connected to the automatic conversion circuit; in the second time period, the second microphone MIC2 is connected to the automatic conversion circuit; in the third time period, the third microphone MIC3 is connected to the automatic conversion circuit; in the fourth time period, the second microphone MIC2 is connected to the automatic conversion circuit, as shown in FIG. Figure 3 shown.

[0037] For another example, when the value of N is 4, that is, four microphones are set, a cycle period (for example, 1 second) can also be divided into four time periods of equal length (for example, the length of each time period can be 250 milliseconds). In the first time period, the first microphone is connected to the automatic conversion circuit; in the second time period, the second microphone is connected to the automatic conversion circuit; in the third time period, the third microphone is connected to the automatic conversion circuit; in the fourth time period, the fourth microphone is connected to the automatic conversion circuit.

[0038] When the value of N is other values, the same can be applied and they are not listed here one by one.

[0039] In addition, as an example, in a preferred specific embodiment of the present application, when the value of N is 2, the N microphones may include: a first top-input sound silicon microphone and a first bottom-input sound silicon microphone.

[0040] For another example, in a preferred specific embodiment of the present application, when the value of N is 3, the N microphones may include: a first top-input sound silicon microphone MIC1, a first bottom-input sound silicon microphone MIC2, and a second top-input sound silicon microphone MIC3, such as Figure 3 shown.

[0041] For another example, as an example, in a preferred specific embodiment of the present application, when the value of N is 4, the N microphones may include: a first top sound input silicon microphone MIC1, a first bottom sound input silicon microphone MIC2, a second top sound input silicon microphone MIC3 and a second bottom sound input silicon microphone MIC4.

[0042] In addition, as an example, Figure 2 As shown, in a preferred specific embodiment of the present application, the automatic conversion circuit 101 may include: a first chip IC1 and a second chip IC2;

[0043] The first chip IC1 is used to send switch control signals corresponding to the N microphones to the second chip IC2 according to the received clock pulse signal;

[0044] The N microphones are respectively connected to the second chip IC2;

[0045] The second chip IC2 is used to turn on or off the corresponding microphone according to the received switch control signal, connect the N microphones to the automatic gain preamplifier circuit 102 in different time periods, and transmit the audio signal received by each microphone in the time period when it is connected to the automatic gain preamplifier circuit 102.

[0046] In addition, as an example, in a specific embodiment of the present application, the N microphones may be connected to the automatic gain preamplifier circuit 102 in a wired or wireless manner.

[0047] In addition, as an example, in a preferred specific embodiment of the present application, the first chip IC1 may be a decade counter circuit; the second chip IC2 may be a quadruple analog switch.

[0048] In addition, as an example, in a preferred specific embodiment of the present application, the first chip IC1 can also be used to receive a first reset pulse signal and a second reset pulse signal; perform a global reset according to the first reset pulse signal; and perform a cycle reset according to the second reset pulse signal.

[0049] Therefore, the first chip IC1 can perform a global reset according to the first reset pulse signal to reset the entire assistive hearing device to a preset initial state, and can also reset the cycle according to the second reset pulse signal, so as to start the next cycle and perform the next round of cyclic switching on each microphone.

[0050] For example, as an example, Figure 3 As shown, when the value of N is 3, that is, 3 microphones are set, in a preferred specific embodiment of the present application:

[0051] The first chip IC1 is provided with a clock pin 14, a reset pin 15 and four analog switch pins (for example, Figure 3 Pins 3, 2, 4, 7 on IC1 shown in );

[0052] The second chip IC2 is provided with four control terminal pins (for example, Figure 3 Pins 13, 5, 6, 12 on IC2 shown in ), 4 microphone pins (e.g. Figure 3 1, 3, 8, 10) and the 4 output pins (e.g., Figure 3 The pins on the IC2 shown in the figure are pins 11, 9, 4, 2); wherein the 4 analog switch pins, the 4 control end pins, the 4 microphone pins and the 4 output end pins correspond to each other one by one;

[0053] One end of two of the three microphones is connected to one microphone pin on the second chip IC2, and one end of the other microphone is connected to two microphone pins on the second chip IC2 (for example, Figure 3As shown, one end of the first top-input sound silicon microphone MIC1 and the second top-input sound silicon microphone MIC3 are respectively connected to pins 1 and 8 on IC2, and one end of the first bottom-input sound silicon microphone MIC2 is respectively connected to pins 3 and 10 on IC2);

[0054] The clock pin 14 of the first chip IC1 is used to receive a clock pulse signal;

[0055] The reset pin 15 of the first chip IC1 is used to receive a first reset pulse signal and a second reset pulse signal;

[0056] The four analog switch pins on the first chip IC1 are connected to the four control end pins on the second chip IC2 in a one-to-one correspondence (for example, the four analog switch pins 3, 2, 4, and 7 on IC1 are connected to the four control end pins 13, 5, 6, and 12 on IC2 in a one-to-one correspondence), and are used to send switch control signals to the corresponding control end pins of the second chip IC2 according to the clock pulse signal;

[0057] The four control terminal pins on the second chip IC2 are used to send the received switch control signals to the corresponding microphone pins respectively;

[0058] The four microphone pins on the second chip IC2 are respectively connected to the four output pins in a one-to-one correspondence, and are used to turn on or off the microphones connected thereto according to the received switch control signal, and transmit the audio signals received by the microphones connected thereto during the time period when they are turned on to the corresponding output pins;

[0059] The four output pins on the second chip IC2 are all connected to a microphone (MIC) signal bus, and transmit the received audio signal to the automatic gain preamplifier circuit through the microphone signal bus and the third coupling capacitor C3.

[0060] In the technical solution of the present application, when the first chip IC1 receives the clock pulse signal, it can output a switch control signal (for example, a high or low level signal) to the second chip IC2 at a preset frequency, and the second chip IC2 will turn on or off the N microphones according to the received switch control signal, so that the N microphones are connected to the automatic gain preamplifier circuit in turn and in different time periods. In the same time period, only one microphone is connected to the automatic gain preamplifier circuit, and the audio signal received by the connected microphone in the time period is transmitted to the automatic gain preamplifier circuit.

[0061] In the above specific embodiment, since three microphones are provided, and four analog switch pins, four control terminal pins, four microphone pins and four output terminal pins are provided respectively, a cycle period can be divided into four time periods of equal duration. For example, when the duration of a cycle period is 1 second, the duration of each time period can be 250 milliseconds; in the first time period, MIC1 is connected to the automatic conversion circuit; in the second time period, MIC2 is connected to the automatic conversion circuit; in the third time period, MIC3 is connected to the automatic conversion circuit; in the fourth time period, MIC2 is connected to the automatic conversion circuit (the microphone MIC2 is used twice in a cycle period), so the above automatic conversion circuit can be used to connect the three microphones to the automatic conversion circuit in turn in the four time periods, and only one microphone is connected to the automatic conversion circuit in each time period, so that the audio signal received by the microphone connected in the time period is transmitted to the automatic gain preamplifier circuit. In the above manner, N microphones can be used cyclically in various time periods in a cycle (for example, 1 second), and the connection between the currently connected microphone and the automatic gain preamplifier circuit is interrupted every period of time (for example, 250 milliseconds), which is equivalent to changing the sound path 4 times in a cycle. Due to the limitation of the speed of sound, it is difficult to form repeated positive feedback of sound waves from the microphone input to the electronic amplifier circuit and then reflected from the sound output back to the microphone within a time period (for example, 250 milliseconds) (in actual application scenarios, it generally takes at least 2 seconds of repeated positive feedback to form howling). Therefore, by switching the sound path in the above cycle, the necessary conditions for generating "circuit feedback" in the electronic amplifier circuit can be lacking, that is, the phase condition and oscillation amplitude, the two basic elements for generating feedback sound, are lacking, so that the sound wave no longer has the conditions for self-excitation in the electronic amplifier circuit, thereby effectively suppressing howling.

[0062] In addition, in other specific implementations of the present application (for example, specific embodiments using other numbers of microphones and other numbers of time periods), howling can also be effectively suppressed through similar principles or methods, which are not listed one by one here.

[0063] In addition, as an example, in a preferred specific embodiment of the present application, the clock pin 14 is further provided with a first delay circuit including a first resistor R1 and a first capacitor C1, which is used to make the angles of the rising edge and the falling edge of the received clock pulse signal have a preset tilt angle, so as to prevent the first chip IC1 from being interfered by clutter and causing malfunction, thereby affecting the normal rotation of multiple microphones;

[0064] The reset pin 15 is further provided with a second delay circuit including a second resistor R2 and a second capacitor C2, which is used to make the rising edge and the falling edge of the received reset pulse signal have a preset inclination angle to prevent the interference of clutter on the first chip IC1 and cause malfunction, affecting the normal rotation of multiple microphones.

[0065] In addition, as an example, in a preferred specific embodiment of the present application, the first chip IC1 is also provided with an output pin Q4, a power pin VDD and a ground pin VSS;

[0066] The output pin (i.e. Figure 3 The pin 10 of the IC1 shown in FIG. 1 is connected to the reset pin 15 through a second diode D2, and is used to output a second reset pulse signal at the end of a cycle;

[0067] The power supply pin VDD (i.e. Figure 3 Pin 16 of IC1 shown in FIG. 1 is used to connect to the power supply;

[0068] The ground pin VSS (i.e. Figure 3 Pin 13 of IC1 shown in the figure is used to connect to the ground line.

[0069] Through the second reset pulse signal, the first chip IC1 can start the next cycle and perform the next round of cyclic switching on each microphone.

[0070] In addition, as an example, in a preferred specific embodiment of the present application, a fifteenth capacitor C15 is also provided on the first chip IC1, one end of the fifteenth capacitor C15 is connected to the power pin VDD of the first chip IC1, and the other end is grounded, and is used to filter the AC signal in the circuit to prevent it from entering the power supply loop, protect the power supply, and bypass the AC signal.

[0071] In addition, as an example, in a preferred specific embodiment of the present application, the second chip IC2 is also provided with a power pin VDD and a ground pin GND;

[0072] The power supply pin VDD (i.e. Figure 3 Pin 14 of IC2 shown in the figure is used to connect to the power supply;

[0073] The ground pin GND (i.e. Figure 3 Pin 7 of IC2 shown in the figure is used to connect to the ground line.

[0074] In addition, as an example, in a preferred specific embodiment of the present application, the automatic conversion circuit 101 may further include: a voltage regulator IC7, a first bypass capacitor (for example, Figure 3The capacitor C19 shown in FIG. 1 ) and a plurality of second bypass capacitors (eg, Figure 3 Capacitors C14 and C9 shown in FIG.

[0075] The first end of the voltage regulator IC7 is connected to the power pin VDD of the first chip IC1 and the power pin VDD of the second chip IC2 respectively, and the second end is connected to the power supply (not shown in the figure), and is used to convert the voltage of the power supply into the working voltage required by the first chip IC1 and the second chip IC2;

[0076] One end of the first bypass capacitor is connected to a power supply (not shown in the figure), and the other end is grounded; it is used to filter the AC signal in the circuit;

[0077] One end of the second bypass capacitor is connected to the first end of the voltage regulator IC7, and the other end is grounded; the second bypass capacitor is used to filter the AC signal in the circuit.

[0078] Through the above-mentioned voltage regulator IC7, the voltage of the power supply (for example, 11.1 volts) can be converted into the operating voltage required by the first chip IC1 and the second chip IC2 (for example, 5 volts); and through the first bypass capacitor and the second bypass capacitor, the AC signal in the circuit can be filtered to prevent it from entering the power supply loop, thereby protecting the power supply and bypassing the AC signal.

[0079] In addition, as an example, Figure 4 As shown, in a preferred specific embodiment of the present application, the automatic gain preamplifier circuit 102 may include: a third chip IC3, a fourth chip IC4, a fifth chip IC5 and a voltage divider circuit;

[0080] The first input terminal of the third chip IC3 is connected to the output terminal of the automatic conversion circuit 101; the output terminal of the third chip IC3 is connected to an input terminal of the fourth chip IC4;

[0081] The first output terminal of the fourth chip IC4 is connected to an input terminal of the fifth chip IC5; the second output terminal of the fourth chip IC4 is connected to the sound path amplification circuit 103;

[0082] The output terminal of the fifth chip IC5 is connected to the second input terminal of the third chip IC3;

[0083] The third chip IC3 is used to transmit the audio signal received from the first input terminal to the fourth chip IC4, calculate the product of the signal received from the first input terminal and the second input terminal, and output the product as a gain value to the fourth chip IC4;

[0084] The fourth chip IC4 is used to perform a first-stage amplification on the received audio signal according to the received gain value; when the strength of the amplified signal is within a preset strength range, the amplified signal is output to the sound path amplifier circuit 103; when the strength of the amplified signal is not within the preset strength range, the amplified signal is rectified and output to the fifth chip IC5;

[0085] The voltage divider circuit includes: a first adjustable voltage divider resistor R k-1 and the second adjustable voltage divider resistor R k-2 The first adjustable voltage divider resistor R k-1 The first end is connected to the power supply, and the second end is connected to the second adjustable voltage divider resistor R k-2 and the first end of the fifth chip IC5; the second adjustable voltage dividing resistor R k-2 The second end of is grounded;

[0086] The fifth chip IC5 is used to perform low-pass filtering on the received signal, and determine the corresponding amplification factor according to the voltage output by the voltage divider circuit, and perform a second stage amplification on the low-pass filtered signal according to the determined amplification factor, and then output it to the third chip IC3.

[0087] In the above-mentioned specific embodiment of the present application, the third chip IC3 in the above-mentioned automatic gain preamplifier circuit 102 can receive the audio signal output by the automatic conversion circuit 101 through the first input terminal (which can be called the audio signal input terminal), and receive the amplified signal output by the fifth chip IC5 through the second input terminal (which can be called the reference signal input terminal), so the product of the signals received from the first input terminal and the second input terminal can be calculated, and the product can be output to the fourth chip IC4 as a gain value; the fourth chip IC4 can amplify the received audio signal according to the received gain value; if the intensity of the amplified signal is within the preset intensity range, the amplified signal can be directly output to the sound path amplifier circuit 103; and if the amplified signal is within the preset intensity range, the amplified signal can be directly output to the sound path amplifier circuit 103; and if the amplified signal is within the preset intensity range, the amplified signal can be directly output to the sound path amplifier circuit 103. When the intensity of the amplified signal is not within the preset intensity range, the amplified signal can be rectified and output to the fifth chip IC5; the fifth chip IC5 first performs a low-pass filter on the received signal, and then determines the corresponding amplification factor according to the voltage output by the voltage divider circuit (which can be called the automatic gain control voltage UREF), and then performs a second-stage amplification on the low-pass filtered signal according to the amplification factor, and then outputs it to the second input terminal of the third chip IC3, thereby starting the next closed-loop cycle, until the intensity of the audio signal is within the preset intensity range, and then the fourth chip IC4 outputs the audio signal to the sound path amplifier circuit 103, so that the intensity of the audio signal received by the sound path amplifier circuit 103 is within the preset intensity range.

[0088] In the technical solution of the present application, the above-mentioned preset intensity range can be pre-set according to the needs of the actual application scenario.

[0089] For example, as an example, in a preferred specific embodiment of the present application, the preset intensity range can be: 25 decibels (db), with an upper and lower fluctuation of no more than 2.5 dB, that is, the preset audio signal intensity range can be [22.5, 27.5] dB.

[0090] Of course, the above preset audio signal intensity range may also be other appropriate values, such as [20, 30] decibels, etc., which are not listed here one by one.

[0091] Therefore, through the above-mentioned automatic gain preamplifier circuit 102, the intensity of the output audio signal can be limited to a preset intensity range, for example, about 25 decibels, so that the audio signal with relatively small intensity in the original audio signal can be enhanced, and the audio signal with relatively large intensity in the original audio signal can be weakened, so that the intensity of the audio signal received by the sound path amplifier circuit 103 is within the preset intensity range.

[0092] In addition, as an example, in a preferred specific embodiment of the present application, the third chip IC3 may be an analog multiplier.

[0093] In addition, as an example, Figure 5 As shown, in a preferred specific embodiment of the present application, the fourth chip IC4 may include: a first-stage amplifier circuit and a precision rectifier circuit;

[0094] An input end of the first-stage amplifier circuit is connected to the output end of the third chip IC3; the output end of the first-stage amplifier circuit is respectively connected to an input end of the precision rectifier circuit and an input end of the sound path amplifier circuit 103;

[0095] The output end of the precision rectifier circuit is connected to the input end of the fifth chip IC5;

[0096] The first-stage amplifier circuit is used to perform a first-stage amplification on the received audio signal according to the received gain value; when the strength of the amplified signal is within a preset strength range, the amplified signal is output to the sound path amplifier circuit 103; when the strength of the amplified signal is not within the preset strength range, the amplified signal is output to the precision rectifier circuit;

[0097] The precision rectifier circuit is used to rectify the received signal and output the rectified signal to the fifth chip IC5.

[0098] In the technical solution of the present application, the signal output by the third chip IC3 can first be amplified by the first-stage amplifier circuit in the fourth chip IC4 (for example, the first-stage gain can be pre-set to 10 to 25 decibels, etc.). If the intensity of the signal amplified by the first-stage amplifier circuit is within the preset intensity range, the amplified signal can be directly output to the sound path amplifier circuit 103; if the intensity of the amplified signal is not within the preset intensity range, the amplified signal can be output to the precision rectifier circuit. After rectification by the precision rectifier circuit, a full-wave pulsating signal of the audio can be obtained and output to the fifth chip IC5.

[0099] In addition, as an example, Figure 6 As shown, in a preferred specific embodiment of the present application, the fifth chip IC5 may include: a first-order active filter circuit and a second-stage amplifier circuit;

[0100] An input end of the first-order active filter circuit is connected to a first output end of the fourth chip IC4, and an output end of the first-order active filter circuit is connected to a first input end of the second-stage amplifier circuit;

[0101] The second input terminal of the second-stage amplifier circuit is connected to the output terminal of the voltage divider circuit; the output terminal of the second-stage amplifier circuit is connected to the second input terminal of the third chip IC3;

[0102] The first-order active filter circuit is used to perform low-pass filtering on the received signal and output the low-pass filtered signal to the second-stage amplification circuit;

[0103] The second-stage amplifier circuit is used to determine a corresponding amplification factor according to the voltage output by the voltage divider circuit, and to perform a second-stage amplification on the signal after low-pass filtering according to the determined amplification factor, and then output the amplified signal to the third chip IC3.

[0104] In the technical solution of the present application, the full-wave pulsating signal of the audio output by the fourth chip IC4 can be filtered by the first-order active filter circuit, so that the pulsating amplitude of the signal tends to a stable average DC level; and then amplified by the second-stage amplifier circuit (for example, the second-stage gain can be pre-set to about 10 decibels) to obtain the amplified signal, and output to the third chip IC3, so as to meet the working conditions of the third chip IC3, and adjust the first-stage amplifier circuit in the fourth chip IC4 as the first-stage gain and the second-stage amplifier circuit in the fifth chip IC5 as the second-stage gain according to the gain of the audio signal required in the actual application. Therefore, the fourth chip IC4 and the fifth chip IC5 can form a closed-loop automatic gain amplifier circuit.

[0105] In addition, the automatic gain control voltage UREF outputted from the output end of the voltage divider circuit can be inputted into the second stage amplifier circuit through the second input end of the second stage amplifier circuit, and the automatic gain control voltage UREF is controlled by the first adjustable voltage divider resistor R k-1 and the second adjustable voltage divider resistor R k-2 The signal obtained by voltage division from the main power supply is obtained. Therefore, the second-stage amplifier circuit can determine the corresponding amplification factor according to the automatic gain control voltage UREF output by the voltage divider circuit, and then perform a second-stage amplification on the signal after low-pass filtering according to the amplification factor, and then output it to the second input end of the third chip IC3 as a reference signal of the third chip IC3, thereby starting the next closed-loop cycle, until the intensity of the audio signal is within the preset intensity range, and then the fourth chip IC4 outputs the audio signal to the sound path amplifier circuit 103, so that the intensity of the audio signal received by the sound path amplifier circuit 103 is within the preset intensity range.

[0106] In addition, as an example, Figure 7 As shown, in a preferred specific embodiment of the present application, the sound path amplification circuit 103 may include: M multi-order active bandpass filters, a sound path configurator, a multiple level configuration circuit and each sound path multiple level amplification circuit;

[0107] The M multi-order active bandpass filters are used to perform low-pass filtering and high-pass filtering on the received audio signal respectively, divide the received audio signal into audio signals of M sound paths according to the frequency band, and output the filtered audio signal to the sound path configurator;

[0108] The sound path configurator is used to output the received audio signals of each sound path to the multiple level configuration circuit, and record the frequency band information of the audio signals of each sound path, and output the recorded frequency band information to the single chip microcomputer 104;

[0109] The multiplication level configuration circuit is used to determine the amplification factors corresponding to the received audio signals of each sound path according to the received amplification instruction, and output the corresponding amplification factors to the multiplication level amplification circuit respectively;

[0110] The multiplication level amplifier circuit is used to amplify the received audio signals of each sound path according to the amplification factor corresponding to each sound path, and transmit the amplified audio signals of each sound path to the volume adjustment and power amplifier circuit 105.

[0111] In the technical solution of the present application, the number of the above-mentioned sound paths and multi-order active bandpass filters, that is, the value of M, can be preset according to the needs of the actual application scenario.

[0112] For example, as an example, in a preferred specific embodiment of the present application, the value of M can be 4, 8, 16, 24, 30, 32, 48, 56, 60, 64, 90, 100, 120, 128, 200 or 1000, etc., or other suitable values, which are not listed here. In general, the larger the value of M, the more the number of sound paths, and the better the sound effect.

[0113] In the above-mentioned specific embodiment of the present application, if it is necessary to divide the received audio signal into M sound paths according to the frequency band, M multi-order active bandpass filters can be set so that each sound path corresponds to a multi-order active bandpass filter one by one; each multi-order active bandpass filter can perform low-pass filtering and high-pass filtering on the audio signal of the sound path corresponding to it to suppress the corresponding high-frequency signal and low-frequency signal, and only allow the audio signal within the preset frequency range to pass, thereby removing the corresponding noise and interference to provide a clearer audio signal.

[0114] In addition, each multi-order active bandpass filter is connected to the multiple level configuration circuit through the sound path configurator, and the sound path configurator can record the frequency band information of the audio signal of each sound path, and output all the recorded frequency band information to the single chip microcomputer 104; and the single chip microcomputer 104 can output the corresponding amplification instruction to the multiple level configuration circuit according to the frequency band information of the audio signal of each sound path, and carry the information of the amplification factor corresponding to each sound path to be amplified in the amplification instruction. Therefore, the multiple level configuration circuit can determine the amplification factor corresponding to the audio signal of each sound path to be amplified according to the received amplification instruction, and output the corresponding amplification factor to the multiple level amplification circuit respectively. Therefore, the multiple level amplification circuit can amplify the audio signal of each sound path to be amplified according to the amplification factor corresponding to each sound path, and transmit the amplified audio signal of each sound path to the volume adjustment and power amplifier circuit 105.

[0115] In addition, in the technical solution of the present application, the frequency ranges (or frequency widths) of the above-mentioned M sound paths can be set according to the needs of the actual application scenario, so that the frequency widths of the various sound paths are the same or different.

[0116] For example, as an example, in a preferred specific embodiment of the present application, 100 sound paths can be set within the frequency range of 1Hz to 20000Hz (that is, the value of M is 100), and the frequency width of each sound path is 200Hz; 200 sound paths can also be set within the frequency range of 1Hz to 20000Hz (that is, the value of M is 200), and the frequency width of each sound path is 100Hz; ... and so on.

[0117] For another example, as an example, in a preferred specific embodiment of the present application, 16 sound paths may be set within the frequency range of 50 Hz to 8000 Hz (ie, the value of M is 16), and the frequency range of each sound path may be respectively:

[0118] The frequency range of the first sound path is: 50Hz~300Hz, and the center frequency is 175Hz;

[0119] The frequency range of the second sound path is: 301Hz~500Hz, and the center frequency is 400Hz;

[0120] The frequency range of the third sound path is: 501Hz~700Hz, and the center frequency is 600Hz;

[0121] The frequency range of the fourth sound path is: 701Hz~800Hz, and the center frequency is 750Hz;

[0122] The frequency range of the fifth sound path is: 801Hz~900Hz, and the center frequency is 850Hz;

[0123] The frequency range of the sixth sound path is: 901Hz~1000Hz, and the center frequency is 950Hz;

[0124] The frequency range of the 7th sound path is: 1001Hz~1200Hz, and the center frequency is 1100Hz;

[0125] The frequency range of the 8th sound path is: 1201Hz~1400Hz, and the center frequency is 1300Hz;

[0126] The frequency range of the 9th sound path is: 1401Hz~1600Hz, and the center frequency is 1500Hz;

[0127] The frequency range of the 10th sound path is: 1601Hz~2000Hz, and the center frequency is 1800Hz;

[0128] The frequency range of the 11th sound path is: 2001Hz~2500Hz, and the center frequency is 2250Hz;

[0129] The frequency range of the 12th sound path is: 2501Hz~3000Hz, and the center frequency is 2750Hz;

[0130] The frequency range of the 13th sound path is: 3001Hz~4000Hz, and the center frequency is 3500Hz;

[0131] The frequency range of the 14th sound path is: 4001Hz~5000Hz, and the center frequency is 4500Hz;

[0132] The frequency range of the 15th sound path is: 5001Hz~6500Hz, and the center frequency is 5750Hz;

[0133] The frequency range of the 16th sound path is: 6501Hz~8000Hz, and the center frequency is 7250Hz.

[0134] In addition, in the technical solution of the present application, the width of the frequency range (i.e., frequency width or frequency density) can be referred to as weight. For example, if the width of the frequency range of a sound path is XHz, the weight of the sound path can be X / 100. For example, if the width of the frequency range of a sound path is 100Hz, the weight of the sound path can be 1; if the width of the frequency range of a sound path is 150Hz, the weight of the sound path can be 1.5; if the width of the frequency range of a sound path is 200Hz, the weight of the sound path can be 2; ..., and so on.

[0135] Therefore, within the frequency range of 50Hz to 8000Hz, the above 16 sound paths have their own frequency ranges, so they have their own weights. For example, the weight of the first sound path is 2.5; the weights of the second, third, seventh, eighth, and ninth sound paths are 2; the weights of the fourth, fifth, and sixth sound paths are 1; the weight of the tenth sound path is 4; the weights of the eleventh and twelfth sound paths are 5; the weights of the thirteenth and fourteenth sound paths are 10; and the weights of the fifteenth and sixteenth sound paths are 15.

[0136] In general, the higher the weight, the smaller the average gain error. The narrower the frequency width of the sound path, the higher the accuracy of the frequency compensation of the multi-order active bandpass filter corresponding to the sound path. The audio signals around the center frequency in the sound path can get the compensation they deserve, and the audio signals outside the upper and lower cutoff frequencies get less amplification, and the fewer audio signals in the sound path that do not need to be amplified, so the noise in the processed audio signal can be lower, and the sound quality and timbre can be better.

[0137] In the above-mentioned frequency range of 50Hz to 1600Hz, 9 sound paths are set respectively (also corresponding to 9 multi-order active bandpass filters respectively), and 3 weights are used in alternating configuration (i.e., weights 2.5, 2, 1, 2 are alternately configured). The reason for the above-mentioned setting is that: in general, the vocal range of Chinese males is in the range of 82Hz to 700Hz, the vocal range of females is in the range of 82Hz to 1200Hz, and the vocal range of special people can reach 1600Hz. Therefore, the frequency range of 50Hz to 1600Hz can be used as the key area of ​​the audio signal, and different frequency bandwidths can be set for each sound path, and different sound quality and timbre enhancement processing can be performed, so that the above-mentioned auxiliary hearing device with 16 sound paths can be more suitable for Chinese hearing-impaired patients. In addition, there is information that foreigners have a slightly higher vocal range, and the vocal range can reach about 2000Hz, so the audio signal of about 2000Hz can be processed in the overtone harmonic domain.

[0138] Therefore, in the above specific embodiment, 16 sound paths are set within the frequency range of 50 Hz to 8000 Hz, and 7 weighted frequency widths are used to suit various hearing-impaired patients or users.

[0139] In addition, in the technical solution of the present application, the width (ie, weight) of the frequency range of each sound path can be flexibly set according to the needs of the actual application scenario.

[0140] For instance, as an example, in a preferred specific embodiment of the present application, the width of the frequency range of any one or more sound paths can be set to 50 Hz, and the weight of the sound path is 0.5; the width of the frequency range of any one or more sound paths can be set to 20 Hz, and the weight of the sound path is 0.2; ...; and so on, which are not listed one by one here.

[0141] In the technical solution of the present application, the number of sound paths can be flexibly set according to the needs of the actual application scenario or according to the needs of each user, and the frequency width of each sound path can be flexibly set. Therefore, the above specific embodiment is only used as an example. In actual use, multiple sound paths can be set according to the situation, and the frequency width of each sound path can be set respectively, which will not be listed one by one here.

[0142] In addition, as an example, in a specific embodiment of the present application, the address information of a sound path can also be set according to the center frequency of the sound path.

[0143] For example, the center frequency of a sound path can be set as the address information of the sound path; or, one or more characters can be added to the back or front of the center frequency of a sound path as the address information of the sound path for address storage and retrieval.

[0144] In addition, as an example, in a preferred specific embodiment of the present application, the multi-order active bandpass filter can be: a second-order active bandpass filter, a fourth-order active bandpass filter, a sixth-order active bandpass filter or an eighth-order active bandpass filter, or other suitable multi-order active bandpass filters, which are not listed here one by one. In general, the higher the order of the active bandpass filter, the faster the sound attenuation at the boundary of the passband, the narrower the boundary, the more obvious the frequency filtering effect, and the clearer the audio signal obtained after filtering.

[0145] In addition, as an example, Figure 8 As shown, in a preferred specific embodiment of the present application, when the multi-order active bandpass filter is a second-order active bandpass filter, the second-order active bandpass filter may include: a second-order active low-pass amplifier circuit and a second-order active high-pass amplifier circuit;

[0146] The second-order active low-pass amplifier circuit is used to perform low-pass filtering on the received audio signal and output the filtered signal to the second-order active high-pass amplifier circuit;

[0147] The second-order active high-pass amplifier circuit is used to perform high-pass filtering on the received audio signal and output the filtered audio signal to the multiple-level configuration circuit.

[0148] Through the above-mentioned second-order active low-pass amplifier circuit, the audio signal of the corresponding sound path can be low-pass filtered to suppress the corresponding high-frequency signal (the cutoff frequency of the second-order active low-pass amplifier circuit can be used as the upper cutoff frequency of the second-order active band-pass filter), and then the audio signal of the corresponding sound path can be high-pass filtered through the second-order active high-pass amplifier circuit to suppress the corresponding low-frequency signal (the cutoff frequency of the second-order active high-pass amplifier circuit can be used as the lower cutoff frequency of the second-order active band-pass filter), so that only the audio signal within the preset frequency range can pass (the frequency range included in the upper cutoff frequency and the lower cutoff frequency is the frequency range of the second-order active band-pass filter), thereby removing the corresponding noise and interference and providing a clearer audio signal.

[0149] In addition, as an example, in a preferred specific embodiment of the present application, the multi-order active bandpass filter may include a plurality of second-order active bandpass filters.

[0150] For example, in a specific embodiment of the present application, a fourth-order active bandpass filter may include two cascaded second-order active bandpass filters; a sixth-order active bandpass filter may include three cascaded second-order active bandpass filters; an eighth-order active bandpass filter may include four cascaded second-order active bandpass filters; and so on, which are not listed one by one here.

[0151] In addition, as an example, Figure 7 As shown, in a preferred specific embodiment of the present application, the multiple level configuration circuit may include: a first eight-bit timer IC8-1, a second eight-bit counter IC8-2 and K multiple resistors (for example, R30-1 to R30-16);

[0152] The K multiple resistors are connected in parallel; the first end of each multiple resistor is respectively connected to the output end of the sound path configurator and an input end of each sound path multiple stage amplifier circuit, and the second end is respectively connected to the first eight-bit timer IC8-1 and the second eight-bit counter IC8-2;

[0153] The first eight-bit timer IC8-1 and the second eight-bit counter IC8-2 are both four-input binary-controlled eight-bit counters;

[0154] The first eight-bit timer IC8-1 and the second eight-bit counter IC8-2 are connected in series to form a sixteen-bit counter (serial output);

[0155] The four input terminals of the first eight-bit timer IC8-1 and the second eight-bit counter IC8-2 (for example, the four parallel input terminals D0, D1, D2, and D3 shown in the figure) are connected one by one and are respectively connected to the single-chip computer 104 to form parallel input terminals.

[0156] In the technical solution of the present application, the number of the multiple resistors, that is, the value of K, can be preset according to the needs of the actual application scenario.

[0157] For example, as an example, in a preferred specific embodiment of the present application, the value of K can be 4, 8, 16, 24, 48 or 56, etc., or other suitable values, which are not listed here one by one.

[0158] In the above specific embodiment of the present application, the first eight-bit timer IC8-1 and the second eight-bit counter IC8-2 are connected in series to form a sixteen-bit counter with a series output, and the four input terminals of the first eight-bit timer IC8-1 and the second eight-bit counter IC8-2 can be used as four parallel input terminals of the sixteen-bit counter, and are respectively connected to the single-chip microcomputer 104. Therefore, the single-chip microcomputer 104 can send an amplification instruction to the two eight-bit counters through the above four parallel input terminals, and the amplification instruction can carry address information (for example, the center frequency information of each sound path) and the serial number of the corresponding multiple resistor, so as to control the two eight-bit counters to turn on the multiple resistor of the corresponding serial number according to the address information in the amplification instruction (for example, the corresponding multiple resistor can be grounded with a low level), and make only one multiple resistor be turned on in the same time period, while the other multiple resistors are in a non-conducting state. Therefore, when the corresponding multiplication resistor is turned on, it is equivalent to setting the corresponding amplification factor for the audio signal of the corresponding sound path; therefore, the multiplication stage amplification circuit can amplify the audio signal of each sound path by a corresponding multiple according to the amplification factor corresponding to each sound path.

[0159] In addition, as an example, in a preferred specific embodiment of the present application, the single-chip microcomputer 104 can also be used to output a clock pulse signal to the automatic conversion circuit 101 (for example, outputting a clock pulse signal to the clock pin 14 of the first chip IC1) and a reset pulse signal (for example, outputting a first reset pulse signal to the clock pin 14 of the first chip IC1).

[0160] In addition, as an example, in a preferred specific embodiment of the present application, the single chip microcomputer 104 can output an amplification instruction to the sound path amplification circuit 103 (for example, output an amplification instruction to the multiple level configuration circuit in the sound path amplification circuit 103) according to a preset configuration file (for example, a file such as a sound path configuration library) and the frequency band information of the audio signal of each sound path;

[0161] The configuration file includes the correspondence between each sound path and various amplification factors (for example, the correspondence between each sound path and each multiple resistor, or the correspondence between the frequency band information of the audio signal of each sound path and the serial number of each multiple resistor, etc.).

[0162] Through the above preset configuration file, the single chip microcomputer 104 can output an amplification instruction carrying information of the amplification factor corresponding to each sound path to the sound path amplification circuit 103.

[0163] In addition, according to the pure tone hearing threshold detection curve of deaf patients, the user's hearing will generally decrease with the increase of audio frequency, and the hearing ability is inversely proportional to the increase of audio frequency. Therefore, in the technical solution of this application, the above configuration file can be pre-set according to the needs of the actual application scenario.

[0164] For example, as an example, in a preferred specific embodiment of the present application, the configuration file may be: a sound path configuration library generated according to the user's pure tone hearing threshold detection curve.

[0165] For example, as an example, in a preferred specific embodiment of the present application, the required amplification factor (i.e., compensation factor) of the audio signal of each sound path can be calculated according to the user's pure tone hearing threshold detection curve during the fitting process, and a corresponding sound path configuration library can be generated according to the correspondence between the audio signal of each sound path and the amplification factor.

[0166] Therefore, in the technical solution of the present application, a corresponding configuration file (equivalent to a configuration file customized for the user) can be generated according to the actual user of the assistive hearing device, and a corresponding amplification instruction can be output to the multiplication level configuration circuit according to the above configuration file. Therefore, according to the specific hearing condition of the actual user, the audio signal of the corresponding sound path can be amplified by a corresponding multiple, the audio range suitable for the user can be adjusted accordingly, selective amplification and noise suppression can be performed, the power of the amplified sound can be compensated according to different frequencies according to the pure tone hearing threshold detection curve of the user, and the sound in the sound path can be compensated to a preset intensity range of the hearing threshold (for example, 25db, with an upper and lower fluctuation of no more than 2.5db), so that the actual user can hear clearer sound signals through the assistive hearing device.

[0167] For example, suppose that according to a user's pure tone hearing threshold detection curve, if the user's right ear needs 30 decibels of sound pressure intensity (hereinafter referred to as sound pressure) to hear a 125Hz sound, and 40 decibels of sound pressure is needed to hear a 250Hz sound. Then, if the 40 decibels of compensatory amplification power is used to amplify the 125Hz sound at the same time, the 125Hz sound is amplified by 10 decibels more, which will make the user uncomfortable. Conversely, if the 250Hz sound is amplified by 30 decibels of 125Hz, it is amplified by 10 decibels less, which will make it difficult for the user to hear the 250Hz voice signal clearly.

[0168] In addition, in the technical solution of the present application, the configuration file in the single-chip microcomputer 104 can be corrected or updated in real time according to the needs of the actual application scenario or the actual use effect, so that it can be easily upgraded and updated to achieve a better hearing compensation effect.

[0169] For another example, as an example, in a preferred specific embodiment of the present application, the left ear sound path configuration library and the right ear sound path configuration library can be generated respectively according to the pure tone hearing threshold detection curve of the user's left ear and the pure tone hearing threshold detection curve of the right ear.

[0170] In actual applications, the hearing curves of the left and right ears of hearing-impaired patients may be different. Therefore, in the technical solution of the present application, two independent sound path configuration libraries for the left and right ears can be used to compensate for the sound respectively, so that individual customization can be achieved for specific users, thereby effectively improving the stereo effect of the sound to achieve a higher sound resolution.

[0171] In addition, as an example, in a preferred specific embodiment of the present application, the configuration file can be set in the single-chip microcomputer 104, and can also be set in an external storage device (for example, a storage device such as a memory card).

[0172] Therefore, in the above specific embodiment of the present application, the single chip computer 104 can read the correspondence between each sound path or frequency band and each multiple resistance from the configuration file, and output an amplification instruction to the sound path amplification circuit 103 according to the correspondence.

[0173] For example, as an example, in a preferred specific embodiment of the present application, the single-chip computer 104 can start loading the memory card, and read the serial number of the multiple resistors corresponding to the frequency band information of the audio signal of each sound path (for example, the center frequency information of each sound path) from the configuration file of the memory card, and then carry the corresponding address information (for example, the center frequency information of each sound path) and the corresponding serial number of the multiple resistor in the amplification instruction, and send it to the sound path amplification circuit 103, so that the two eight-bit counters can be controlled to turn on the multiple resistors of the corresponding serial number according to the address information in the amplification instruction.

[0174] In addition, as an example, in a preferred specific embodiment of the present application, the single chip microcomputer 104 can also be used to control volume adjustment.

[0175] For example, as an example, in a preferred specific embodiment of the present application, one end of the single-chip microcomputer 104 is connected to the volume increase button and the volume decrease button respectively, and the other end is connected to the volume adjustment and power amplifier circuit 105.

[0176] Therefore, when the volume increase button is pressed, the single chip microcomputer 104 receives a volume increase signal, and sends a volume increase instruction to the volume adjustment and power amplifier circuit 105 according to the volume increase signal; and when the volume decrease button is pressed, the single chip microcomputer 104 receives a volume decrease signal, and sends a volume decrease instruction to the volume adjustment and power amplifier circuit 105 according to the volume decrease signal. The volume adjustment and power amplifier circuit 105 can increase or decrease the volume according to the received volume increase instruction or volume decrease instruction.

[0177] In addition, as an example, in a preferred specific embodiment of the present application, the single-chip microcomputer 104 can be connected to an external device (for example, an external computer, etc.) through a serial port to obtain and update programs and configuration files in the single-chip microcomputer 104, thereby realizing a program update function after a hearing curve changes or a product upgrade.

[0178] In summary, in the technical solution of the present application, since the automatic switching circuit in the assistive hearing device is connected to N microphones in time periods, and the audio signals received when each microphone is connected to the automatic switching circuit are transmitted to the automatic gain preamplifier circuit, the N microphones can be used cyclically in each time period to cyclically switch each sound path, thereby avoiding as much as possible the repeated positive feedback of sound waves input from the microphone and then reflected back to the microphone after being output through subsequent circuits such as the automatic gain preamplifier circuit, the sound path amplifier circuit, the volume adjustment and power amplifier circuit, etc., so that the necessary conditions for generating "circuit feedback" are missing in the electronic amplification circuit, that is, the phase condition and the oscillation amplitude, which are the two basic elements for generating feedback sound, are missing, so that the sound waves no longer have the characteristics of "circuit feedback" in the electronic amplification circuit. The condition for self-excitation is met, thereby effectively suppressing howling; in addition, since the audio signal can be processed by the automatic gain preamplifier circuit, the intensity of the processed audio signal is within the preset intensity range (for example, about 25 decibels), and then the audio signal is divided into multiple sound paths according to the frequency band through the sound path amplification circuit, and the audio signal of each sound path is amplified according to different amplification factors according to the amplification instruction sent by the single-chip microcomputer, so that the audio signal within the user's auditory frequency range can be effectively amplified, and other noise signals can be effectively suppressed, so that the user can hear the sound content in the audio signal more easily, and the sound quality of the audio signal can be effectively improved to enhance the user's experience.

[0179] Furthermore, the above-mentioned assistive hearing device in the present application can also be customized for specific users, thereby effectively improving the stereo effect of the sound to achieve a higher sound resolution.

[0180] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An assistive hearing device, characterized in that: The hearing aid device comprises: an automatic conversion circuit, an automatic gain preamplifier circuit, a sound path amplifier circuit, a single chip microcomputer, a volume adjustment and power amplifier circuit and N microphones; wherein N is an integer greater than or equal to; The automatic conversion circuit is used to connect the N microphones to the automatic gain preamplifier circuit respectively in different time periods, and transmit the audio signals received by each microphone in the time period when it is connected to the automatic gain preamplifier circuit; The automatic gain preamplifier circuit is used to process the received audio signal so that the intensity of the processed audio signal is within a preset intensity range, and transmit the processed audio signal to the sound path amplifier circuit; The single chip microcomputer is used to send an amplification instruction to the sound path amplification circuit, wherein the amplification instruction includes amplification factor information corresponding to multiple sound paths; the single chip microcomputer is also used to output a clock pulse signal and a reset pulse signal to the automatic conversion circuit; The sound path amplification circuit is used to divide the received audio signal into multiple sound paths according to the frequency band; according to the received amplification instruction, the audio signal of each sound path is amplified respectively, and the amplified audio signal of each sound path is transmitted to the volume adjustment and power amplification circuit; The volume adjustment and power amplification circuit is used to adjust the volume of the received audio signal according to the received adjustment instruction, and output the adjusted audio signal.

2. The assistive hearing device according to claim 1, characterized in that: The automatic conversion circuit comprises: a first chip and a second chip; The first chip is used to send switch control signals corresponding to the N microphones to the second chip respectively according to the received clock pulse signal; The N microphones are respectively connected to the second chip; The second chip is used to turn on or off the corresponding microphone according to the received switch control signal, connect N microphones to the automatic gain preamplifier circuit in different time periods, and transmit the audio signal received by each microphone in the time period when it is connected to the automatic gain preamplifier circuit.

3. The assistive hearing device according to claim 2, characterized in that: The first chip is also used to receive a first reset pulse signal and a second reset pulse signal; perform a global reset according to the first reset pulse signal; and perform a cycle reset according to the second reset pulse signal.

4. The assistive hearing device according to claim 3, characterized in that: When 3 microphones are set up: The first chip is provided with a clock pin, a reset pin and four analog switch pins; The second chip is provided with 4 control end pins, 4 microphone pins and 4 output end pins; wherein the 4 analog switch pins, 4 control end pins, 4 microphone pins and 4 output end pins correspond to each other one by one; One end of two of the three microphones is connected to one microphone pin on the second chip, and one end of the other microphone is connected to two microphone pins on the second chip; The clock pin of the first chip is used to receive a clock pulse signal; The reset pin of the first chip is used to receive a first reset pulse signal and a second reset pulse signal; The four analog switch pins on the first chip are connected to the four control end pins on the second chip in a one-to-one correspondence, respectively, and are used to send switch control signals to the corresponding control end pins of the second chip according to the clock pulse signal; The four control terminal pins on the second chip are used to send the received switch control signals to the corresponding microphone pins respectively; The four microphone pins on the second chip are respectively connected to the four output pins in a one-to-one correspondence, and are used to turn on or off the microphones connected thereto according to the received switch control signal, and transmit the audio signals received by the microphones connected thereto during the time period when they are turned on to the corresponding output pins; The four output pins on the second chip are all connected to the microphone signal bus, and the received audio signal is transmitted to the automatic gain preamplifier circuit through the microphone signal bus and the third coupling capacitor.

5. The assistive hearing device according to claim 1 or 2, characterized in that: The automatic gain preamplifier circuit comprises: a third chip, a fourth chip, a fifth chip and a voltage divider circuit; The first input terminal of the third chip is connected to the output terminal of the automatic conversion circuit; the output terminal of the third chip is connected to an input terminal of the fourth chip; The first output terminal of the fourth chip is connected to an input terminal of the fifth chip; the second output terminal of the fourth chip is connected to the sound path amplification circuit; The output terminal of the fifth chip is connected to the second input terminal of the third chip; The third chip is used to transmit the audio signal received from the first input terminal to the fourth chip, calculate the product of the signal received from the first input terminal and the second input terminal, and output the product as a gain value to the fourth chip; The fourth chip is used to perform a first-stage amplification on the received audio signal according to the received gain value; when the strength of the amplified signal is within a preset strength range, the amplified signal is output to the sound path amplifier circuit; when the strength of the amplified signal is not within the preset strength range, the amplified signal is rectified and output to the fifth chip; The voltage divider circuit comprises: a first adjustable voltage divider resistor and a second adjustable voltage divider resistor; a first end of the first adjustable voltage divider resistor is connected to a power supply, and a second end of the first adjustable voltage divider resistor is connected to a first end of the second adjustable voltage divider resistor and the fifth chip; a second end of the second adjustable voltage divider resistor is grounded; The fifth chip is used to perform low-pass filtering on the received signal, and determine the corresponding amplification factor according to the voltage output by the voltage divider circuit, perform a second stage amplification on the low-pass filtered signal according to the determined amplification factor, and output it to the third chip.

6. The assistive hearing device according to claim 5, characterized in that: The fourth chip includes: a first-stage amplifier circuit and a precision rectifier circuit; An input end of the first-stage amplifier circuit is connected to an output end of the third chip; an output end of the first-stage amplifier circuit is respectively connected to an input end of the precision rectifier circuit and an input end of the sound path amplifier circuit; The output end of the precision rectifier circuit is connected to the input end of the fifth chip; The first-stage amplifier circuit is used to perform a first-stage amplification on the received audio signal according to the received gain value; when the strength of the amplified signal is within a preset strength range, the amplified signal is output to the sound path amplifier circuit; when the strength of the amplified signal is not within the preset strength range, the amplified signal is output to the precision rectifier circuit; The precision rectifier circuit is used to rectify the received signal and output the rectified signal to the fifth chip.

7. The assistive hearing device according to claim 5, characterized in that: The fifth chip comprises: a first-order active filter circuit and a second-stage amplifier circuit; An input end of the first-order active filter circuit is connected to the first output end of the fourth chip, and the output end of the first-order active filter circuit is connected to the first input end of the second-stage amplifier circuit; The second input terminal of the second-stage amplifier circuit is connected to the output terminal of the voltage divider circuit; the output terminal of the second-stage amplifier circuit is connected to the second input terminal of the third chip; The first-order active filter circuit is used to perform low-pass filtering on the received signal and output the low-pass filtered signal to the second-stage amplification circuit; The second-stage amplifier circuit is used to determine the corresponding amplification factor according to the voltage output by the voltage divider circuit, and perform second-stage amplification on the low-pass filtered signal according to the determined amplification factor, and then output it to the third chip.

8. The assistive hearing device according to claim 1, characterized in that: The sound path amplification circuit comprises: M multi-order active bandpass filters, a sound path configurator, a multiple level configuration circuit and multiple level amplification circuits of each sound path; The M multi-order active bandpass filters are used to perform low-pass filtering and high-pass filtering on the received audio signal respectively, divide the received audio signal into audio signals of M sound paths according to the frequency band, and output the filtered audio signal to the sound path configurator; The sound path configurator is used to output the received audio signals of each sound path to the multiple level configuration circuit, record the frequency band information of the audio signals of each sound path, and output the recorded frequency band information to the single chip microcomputer; The multiplication level configuration circuit is used to determine the amplification factors corresponding to the received audio signals of each sound path according to the received amplification instruction, and output the corresponding amplification factors to the multiplication level amplification circuit respectively; The multiplication level amplifier circuit is used to amplify the received audio signals of each sound path according to the amplification factor corresponding to each sound path, and transmit the amplified audio signals of each sound path to the volume adjustment and power amplifier circuit.

9. The assistive hearing device according to claim 8, characterized in that: The frequency ranges of the M sound paths are set so that the frequency widths of the various sound paths are the same or different.

10. The assistive hearing device according to claim 8, characterized in that: The multi-order active bandpass filter is a second-order active bandpass filter, a fourth-order active bandpass filter, a sixth-order active bandpass filter or an eighth-order active bandpass filter; The second-order active bandpass filter comprises: a second-order active low-pass amplifier circuit and a second-order active high-pass amplifier circuit; The second-order active low-pass amplifier circuit is used to perform low-pass filtering on the received audio signal and output the filtered signal to the second-order active high-pass amplifier circuit; The second-order active high-pass amplifier circuit is used to perform high-pass filtering on the received audio signal and output the filtered audio signal to the multiple-level configuration circuit.

11. The assistive hearing device according to claim 8, characterized in that: The multiple level configuration circuit comprises: a first eight-bit timer, a second eight-bit counter and K multiple resistors; The K multiple resistors are connected in parallel; the first end of each multiple resistor is respectively connected to the output end of the sound path configurator and an input end of each sound path multiple stage amplifier circuit, and the second end is respectively connected to the first eight-bit timer and the second eight-bit counter; The first eight-bit timer and the second eight-bit counter are both four-input binary-controlled eight-bit counters; The first eight-bit timer and the second eight-bit counter are connected in series to form a sixteen-bit counter; The four input terminals of the first eight-bit timer and the second eight-bit counter are connected one by one and are respectively connected to the single chip microcomputer to form parallel input terminals.

12. The assistive hearing device according to claim 1, characterized in that: The single chip microcomputer outputs an amplification instruction to the sound path amplification circuit according to a preset configuration file and the frequency band information of the audio signal of each sound path; the configuration file includes the corresponding relationship between each sound path and various amplification factors.

13. The assistive hearing device according to claim 12, characterized in that: The configuration file is: A sound path configuration library generated based on the user's pure tone hearing threshold detection curve.

14. The assistive hearing device according to claim 13, characterized in that: According to the pure tone hearing threshold detection curve of the user's left ear and the pure tone hearing threshold detection curve of the right ear, a left ear sound path configuration library and a right ear sound path configuration library are generated respectively.

15. The assistive hearing device according to claim 1, characterized in that: The single chip microcomputer is also used to control volume adjustment; One end of the single chip microcomputer is connected to the volume increase button and the volume decrease button respectively, and the other end is connected to the volume adjustment and power amplifier circuit.

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