Bluetooth audio hearing aid that blocks noise signals from bluetooth audio module

Abstract

The present invention relates to a hearing aid having a Bluetooth audio function and provides a Bluetooth audio hearing aid that blocks Bluetooth noise signals by separately supplying power to a Bluetooth module and to a hearing aid module and an audio output amplifier module, and by transmitting left and right outputs of the Bluetooth module as input signals to the audio output amplifier module.

Description

Bluetooth audio hearing aid that blocks Bluetooth noise signals

[0001] The present invention relates to a hearing aid equipped with a Bluetooth audio function, and its technical field is a hearing aid technology that blocks noise signals generated from a Bluetooth module.

[0002] As background technology for the present invention, there is the Bluetooth headphone technology having a hearing aid function disclosed in Korean Registered Patent Publication No. 10-2502385B1, illustrated in Fig. 1. This technology comprises: a microphone for receiving an external sound source; a Bluetooth communication unit for receiving a terminal sound source by communicating via Bluetooth with a mobile communication terminal; a mode selection button for selecting a hearing aid mode to operate as a hearing aid or a headphone mode to operate as a headphone; a pre-amplifier for performing input gain control to adjust the external sound received through the microphone to a set stable level; a control unit for transmitting the external sound source received through the Bluetooth communication unit to an output amplifier when the hearing aid mode is selected via the mode selection button, and transmitting the terminal sound source received through the Bluetooth communication unit to an output amplifier when the headphone mode is selected via the mode selection button; an output amplifier for performing output gain control to amplify the output sound source output through the control unit to a preset output level and transmitting it to a speaker; and a speaker for outputting the sound source amplified through the output amplifier.

[0003] However, this technology has a problem in that noise signals can be played back through the speaker because it is not equipped with means to reduce or block noise generated from the Bluetooth communication unit and introduced into the circuit.

[0004]

[0005] As another background technology for the present invention, there is the technology of a smart user assistance device using Bluetooth disclosed in Korean Registered Patent Publication No. 10-1450014B1, illustrated in Fig. 2. This technology is characterized by a smart user assistance device that interacts with an external smart terminal via Bluetooth and processes stereo audio signals according to a device operation mode including an entertainment mode and a hearing aid mode to provide to the user.

[0006] However, this technology also has a problem in that the Bluetooth communication unit, stereo microphone set, stereo output unit, etc., are connected to the device control unit, so noise signals generated from the Bluetooth communication unit can be played back through the speaker.

[0007] The present invention aims to solve the problem of providing a Bluetooth audio hearing aid that blocks Bluetooth noise signals by completely blocking noise generated from a Bluetooth module, by supplying separate power to a Bluetooth module, a hearing aid module, and an audio output amplifier module, and by transmitting the left and right outputs of the Bluetooth module as input signals to the audio output amplifier module.

[0008] The present invention provides a Bluetooth audio hearing aid that blocks Bluetooth noise signals capable of transmitting the left and right outputs of the Bluetooth module as input signals to the audio output amplifier module, by supplying separate power to the Bluetooth module, the hearing aid module, and the audio output amplifier module.

[0009] According to the Bluetooth audio hearing aid for blocking Bluetooth noise signals of the present invention, by supplying separate power to the Bluetooth module, the hearing aid module, and the audio output amplifier module, and by transmitting the left and right outputs of the Bluetooth module as input signals to the audio output amplifier module, there is a technical effect of completely blocking noise generated from the Bluetooth module.

[0010] Figure 1 is a configuration of Bluetooth headphone technology having a hearing aid function as background technology.

[0011] Figure 2 illustrates, as other background technology, the configuration of a smart user assistance device technology using Bluetooth.

[0012] Drawing 3 is an example of the basic configuration of a hearing aid equipped with a Bluetooth audio function.

[0013] Drawing 4 is an example of the detailed configuration of a hearing aid equipped with a Bluetooth audio function.

[0014] Drawing 5 shows the basic configuration of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0015] Drawing 6 shows the basic configuration of the power module (104) of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0016] Figure 7 shows the configuration of a matching circuit of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0017] Figure 8 shows a detailed configuration of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0018] Figure 9 shows the basic configuration of another embodiment of a hearing aid having a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0019] Figure 10 illustrates the configuration of a matching circuit as another embodiment of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0020] Figure 11 shows a detailed configuration as another embodiment of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0021] The present invention relates to a hearing aid equipped with a Bluetooth audio function, and provides a Bluetooth audio hearing aid in the best form for carrying out the invention, wherein the power supply to the Bluetooth module, the hearing aid module, and the audio output amplifier module is supplied separately, and the left and right outputs of the Bluetooth module are transmitted as input signals to the audio output amplifier module, thereby blocking Bluetooth noise signals.

[0022] The following description merely illustrates the principles of the present invention. Accordingly, those skilled in the art may invent various devices that embody the principles of the present invention and are included within the concept and scope of the present invention, even though they are not explicitly described or illustrated in this specification. Furthermore, all conditional terms and embodiments listed in this specification are, in principle, explicitly intended only for the purpose of understanding the concept of the present invention and should be understood as not being limited to the embodiments and conditions specifically listed as such. Additionally, all detailed descriptions enumerating specific embodiments, as well as the principles, aspects, and embodiments of the present invention, should be understood as being intended to include structural and functional equivalents thereof.

[0023] The aforementioned objectives, features, and advantages will become clearer through the following detailed description in conjunction with the attached drawings. In describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions may unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0024]

[0025] Drawing 3 illustrates an example of the basic configuration of a hearing aid equipped with a Bluetooth audio function.

[0026] A hearing aid equipped with Bluetooth audio functions as shown in the drawing,

[0027] It is composed of a Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR; a hearing aid module (300) that amplifies the signal of the left and right microphones and outputs hearing-compensated hearing aid outputs HL and HR; a mode switching switch that selects the left and right outputs BL and BR of the Bluetooth module (200) and the outputs HL and HR of the hearing aid module (300), respectively; an audio output amplifier module (400) that receives the output of the Bluetooth module (200) and the output of the hearing aid module (300) selected by the mode switching switch as left and right input signals AL and AR, and transmits them to the user as audio signals; and a power module (100) that charges a secondary battery and connects the output voltage VDD of the charged secondary battery and the ground GND to the power supply of each module.

[0028] In a hearing aid equipped with the Bluetooth audio function as described above, the Bluetooth module (200) has a structure in which digital and analog circuits are mixed, such as a signal for pairing with a Bluetooth audio device, a pulse signal for transmitting and receiving audio data in packet units, and a D / A converter for converting received audio data into an analog output, thereby generating noise between VDD and GND. In particular, when a signal is transmitted from the Bluetooth module (200), this noise increases and affects the circuit operation of other modules, resulting in a noisy sound being output to the user's hearing.

[0029] In the present invention, electrical noise generated within a circuit as described above is classified as 'noise,' and sound noise generated therefrom is classified as 'noisy sound.'

[0030]

[0031] Drawing 4 illustrates an example of the detailed configuration of a hearing aid equipped with a Bluetooth audio function. The hearing aid equipped with a Bluetooth audio function is,

[0032] A Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR, and

[0033] A hearing aid module (300) comprising: a left hearing aid amplifier (302L) that amplifies the signal of a left microphone (300L) and compensates for gain in response to the user's hearing, and a left volume controller (304L) that adjusts the gain of the output signal to output a left hearing aid signal HL; a right hearing aid amplifier (302R) that amplifies the signal of a right microphone (300R) and compensates for gain in response to the user's hearing, and a right volume controller (304R) that adjusts the gain of the output signal to output a right hearing aid signal HR;

[0034] A mode switching switch (310) for selecting the outputs BL and BR of the Bluetooth module (200) and the outputs HL and HR of the hearing aid module (300), respectively;

[0035] An audio output amplifier module (400) that receives the outputs BL and BR of the Bluetooth module (200) selected by the mode switching switch (310) and the outputs HL and HR of the hearing aid module (300), amplifies them into left and right signals of AR and AL using the left audio amplifier (402L) and the right audio amplifier (402R), respectively, and transmits them to the user as audio signals;

[0036] It is composed of a power supply unit (110) that charges and outputs a secondary battery (130), and a power module (100) in which the output voltage VDD of the charged secondary battery (130) and the ground GND are connected to the power supply of each module via a switch (120).

[0037] In a hearing aid equipped with the Bluetooth audio function as described above, the Bluetooth module (200) generates noise between VDD and GND as previously mentioned. In particular, this noise increases when a signal is transmitted from the Bluetooth module (200). Furthermore, since the left microphone (300L) and right microphone (300R) of the hearing aid module (300) are generally configured with a high input impedance circuit (not shown) biased by the power supply voltage, this noise is output as a noisy sound from the hearing aid module (300) having high amplification. This is noise that cannot be eliminated, even if an amplifier with an excellent power supply rejection ratio (PSRR), which is the ratio of power supply voltage fluctuations appearing as output, is used in the hearing aid circuit; it is only partially reduced.

[0038] The present invention provides a Bluetooth audio hearing aid that blocks Bluetooth noise signals to solve such problems.

[0039]

[0040] Drawing 5 illustrates the basic configuration of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0041] A hearing aid having a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention as shown in the drawing,

[0042] A Bluetooth module (200) that is paired with a mobile device, etc., to receive an audio signal and output it as left and right signals BL and BR; a hearing aid module (300) that amplifies the signal of the left and right microphones and outputs hearing aid outputs HL and HR through a hearing compensation circuit; a matching circuit that takes the outputs BL and BR of the Bluetooth module (200) as inputs and provides a corresponding matching output; a mode switching switch that selects the left and right outputs HL and HR of the Bluetooth module (200) and the outputs HL and BR of the matching circuit, respectively; an audio output amplifier module (400) that receives the output of the matching circuit selected by the mode switching switch and the output of the hearing aid module (300) as left and right input signals AL and AR and transmits them to the user as audio signals; and a power module (104) that charges a secondary battery and is equipped with a first power source VDD1-GND1 of the charged secondary battery and a second power source VDD2-GND2 as a second power source with separated voltage and ground, thereby providing the Bluetooth The module (200) is configured such that VDD1 and GND1 of the first power supply are connected to it, and VDD2 and GND2 of the second power supply are connected to the hearing aid module (300) and the audio output amplifier module (400).

[0043] The configuration of the present invention as described above can completely block noise generated from the Bluetooth module (200) by supplying power to the Bluetooth module (200), the hearing aid module (300), and the audio output amplifier module (400) by separating the power supply into VDD1-GND1 of the first power supply and VDD2-GND2 of the second power supply. However, in a connection state where the power and ground are completely separated, a separate means is required to transmit the left and right outputs BL and BR of the Bluetooth module (200) to the input signals AR and AL of the audio output amplifier module (400) without making the grounds GND1 and GND2 common. To this end, the present invention provides a matching circuit. Below, the power supply unit, the matching circuit, and the circuit configuration for this purpose will be described in detail.

[0044]

[0045] Drawing 6 illustrates the basic configuration of a power module (104) of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention. As described above, the power module (104) of the present invention charges a secondary battery and is equipped with a first power source VDD1-GND1 of the charged secondary battery and a second power source VDD2-GND2 as a second power source with separated voltage and ground.

[0046] The drawing illustrates the basic configuration and symbols of an isolated DC-DC converter in the present invention, which provides a first power source VDD1-GND1 of a charged secondary battery and a second power source VDD2-GND2 with separated voltage and ground. Although a method of configuring another power source with the same configuration as the first power source of the charged secondary battery as the second power source could be considered, since this may cause circuit imbalance depending on the discharge degree of the first power source and the second power source, the present invention provides a first power source and a second power source using a DC-DC converter from said first power source.

[0047] The isolated DC-DC converter of the present invention is based on a transformer in which the primary and secondary sides are electrically isolated. When a first power source is applied as an input voltage to the primary winding and a semiconductor switch SD is periodically switched ON and OFF, the AC power generated by the primary winding and the resonant capacitor Cr is transferred to the secondary winding. The AC power transferred to the secondary side is output as a DC voltage by a diode D and a smoothing capacitor Cd. Therefore, the primary input power is isolated from the secondary side, and from this, the first power source input to the primary side and the second power source output to the secondary side are provided to the circuit in a state where the power source and ground are separated.

[0048] Thus, by separating and supplying power to the Bluetooth module (200), the hearing aid module (300), and the audio output amplifier module (400) into VDD1-GND1 of the first power supply and VDD2-GND2 of the second power supply, noise generated from the Bluetooth module (200) can be completely blocked.

[0049] However, when a first power supply and a second power supply are connected with the power supply and ground completely separated, a separate means is required to transmit the left and right outputs BL and BR of the Bluetooth module (200) to the input signals AR and AL of the audio output amplifier module (400) without making the grounds GND1 and GND2 common. The matching circuit of the present invention is provided as a means to solve this.

[0050]

[0051] Drawing 7 illustrates the configuration of a matching circuit of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention.

[0052] The matching circuit is;

[0053] The left output signal HL of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A1 and connected to a non-inverting buffer whose output is feedback connected to the inverting input, so that the left output signal HL is output to operational amplifier A1. The output of A1 is connected to inverting amplifier A2, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R1, and the feedback resistance between the inverting input terminal and the output is R2. In this case, when R1=R2, the output of A2 becomes the inverted signal of the left output signal HL, and is output as two signals, including the non-inverted left output signal HL of A1. Here, the power supply and ground of A1 and A2 are provided by VDD1-GND1 of the first power supply.

[0054] The inverted / non-inverted signals of the left output signal HL produced by the above A1 and A2 are connected to a differential amplifier composed of the input resistor Ra of the inverting input terminal of operational amplifier A5, a feedback resistor Rb connected from the output terminal to the inverting input terminal, the input resistor Rc of the non-inverting input terminal, and a resistor Rd connected between ground and the inverting input terminal; wherein the non-inverted left output signal HL of the aforementioned A1 is connected to the input resistor Rc of the non-inverting input terminal of A5, and the inverted left output signal HL of A2 is connected to the input resistor Ra of the inverting input terminal of A5. Here, the power supply and ground of A5 are provided with VDD2-GND2 of the second power supply.

[0055] At this time, if the resistors R1=R2 and Ra=Rb=Rc=Rd, the differential output of A5 is the non-inverted signal of the left output signal HL - the inverted signal of the left output signal HL; thus, it can be seen that the output of A5 is the voltage difference between A1 and A2.

[0056] Next,

[0057] The right output signal HR of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A3 and connected to a non-inverting buffer whose output is feedback connected to the inverting input, so that the left output signal HL is output to operational amplifier A3. The output of A3 is connected to inverting amplifier A4, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R3, and the feedback resistance between the inverting input terminal and the output is R4. In this case, when R3=R4, the output of A4 becomes the inverted signal of the right output signal HR, and is output as two signals, including the non-inverted right output signal HR of A3. Here, the power and ground of A3 and A4 are provided by VDD1-GND1 of the first power supply.

[0058] The inverted / non-inverted signals of the right output signal HR produced by the above A3 and A4 are connected to a differential amplifier composed of the input resistor Re of the inverting input terminal of operational amplifier A6, a feedback resistor Rf connected from the output terminal to the inverting input terminal, the input resistor Rg of the non-inverting input terminal, and a resistor Rh connected between ground and the inverting input terminal; wherein the non-inverted right output signal HR of the aforementioned A3 is connected to the input resistor Rg of the non-inverting input terminal of A6, and the inverted right output signal HR of A4 is connected to the input resistor Re of the inverting input terminal of A6. Here, the power supply and ground of A6 are provided by VDD2-GND2 of the second power supply.

[0059] At this time, if the resistors R3=R4 and Re=Rf=Rg=Rh, the differential output of A6 is the non-inverted signal of the right output signal HR minus the inverted signal of the left output signal HL; thus, it can be seen that the output of A6 is the voltage difference between A3 and A4.

[0060] The configuration of the matching circuit of the hearing aid equipped with the above-described Bluetooth audio function is characterized by driving the circuit with a power supply in which voltage and ground are separated into a first power supply and a second power supply to block noise signals generated from the Bluetooth module (200), and additionally transmitting the output BL and BR signals of the Bluetooth module (200) to an audio output amplifier module (400) selected by a mode switching switch (310).

[0061]

[0062] Drawing 8 illustrates the detailed configuration of a hearing aid of the present invention equipped with a Bluetooth audio function that blocks Bluetooth noise signals. The hearing aid of the present invention equipped with a Bluetooth audio function that blocks Bluetooth noise signals comprises:

[0063] The device comprises a power supply unit (110) that charges and outputs a secondary battery (130), a power module (104) in which the output voltage VDD and ground GND of the charged secondary battery (130) pass through a switch (120) to provide a first power supply VDD1-GND1, and an isolated DC-DC converter (140) with separated voltage and ground to provide a second power supply VDD2-GND2 using the first power supply as an input.

[0064] A Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR, and

[0065] A matching circuit that takes the outputs BL and BR of the above Bluetooth module (200) as inputs and provides a matching output corresponding thereto,

[0066] A hearing aid module (300) comprising: a left hearing aid amplifier (302L) that amplifies the signal of a left microphone (300L) and compensates for gain in response to the user's hearing, and a left volume controller (304L) that adjusts the gain of the output signal to output a left hearing aid signal HL; a right hearing aid amplifier (302R) that amplifies the signal of a right microphone (300R) and compensates for gain in response to the user's hearing, and a right volume controller (304R) that adjusts the gain of the output signal to output a right hearing aid signal HR;

[0067] A mode switching switch (330) for selecting the left and right outputs HL and HR of the Bluetooth module (200) via the matching circuit and the outputs HL and HR of the hearing aid module (300), respectively.

[0068] An audio output amplifier module (400) that receives the outputs BL and BR of a Bluetooth module (200) selected by the mode switching switch (330), or the outputs HL and HR of a hearing aid module (300), amplifies them into left and right signals of AL and AR using a left audio amplifier (402L) and a right audio amplifier (402R), respectively, and transmits them to the user as audio signals;

[0069] Equipped with,

[0070] The above Bluetooth module (200) is characterized by being configured to drive the power of the first power supply VDD1-GND1, the hearing aid module (300), and the audio output amplifier module (400) by separating the power of the second power supply VDD2-GND2.

[0071] The above matching circuit is;

[0072] Operational amplifiers A1 and A2 driven by VDD1-GND1 of the first power supply are provided, and the left output signal HL of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A1 and output, and the non-invertedly amplified signal of said operational amplifier A1 is received and invertedly amplified by operational amplifier A2 and output.

[0073] A differential amplifier is provided, comprising an operational amplifier A5 driven by VDD2-GND2 of the second power supply, wherein the non-inverted left output signal HL of A1 is connected to the non-inverted input of A5, and the inverted left output signal HL of A2 is connected to the inverted input terminal of A5, so that the output of A5 is connected to a mode switching switch (330).

[0074] Operational amplifiers A3 and A4 driven by VDD1-GND1 of the first power supply are provided, and the right output signal HR of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A3 and output, and the signal non-invertedly amplified by operational amplifier A3 is received and invertedly amplified by operational amplifier A4 and output.

[0075] A differential amplifier is provided, comprising an operational amplifier A6 driven by VDD2-GND2 of the second power supply, wherein the non-inverted right output signal HR of A3 is connected to the non-inverted input of A6, and the inverted right output signal HR of A4 is connected to the inverted input terminal of A6, so that the output of A6 is connected to the mode switching switch (330).

[0076]

[0077] Drawing 9 illustrates the basic configuration of another embodiment of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention. This configuration is such that, for the aforementioned hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, the hearing aid module (300) and the audio output amplifier module (400) are driven by a first power source and the Bluetooth module (200) is driven by a second power source, thereby blocking the hearing aid module (300) and the audio output amplifier module (400) from noise generated from the Bluetooth module (200).

[0078] A hearing aid having a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention as shown in the drawing,

[0079] A Bluetooth module (200) that is paired with a mobile device, etc., to receive an audio signal and output it as left and right signals BL and BR; a hearing aid module (300) that amplifies the signal of the left and right microphones and outputs hearing aid outputs HL and HR through a hearing compensation circuit; a matching circuit that takes the outputs BL and BR of the Bluetooth module (200) as inputs and provides a corresponding matching output; a mode switching switch that selects the left and right outputs HL and HR of the Bluetooth module (200) and the outputs HL and BR of the matching circuit, respectively; an audio output amplifier module (400) that receives the output of the matching circuit selected by the mode switching switch and the output of the hearing aid module (300) as left and right input signals AL and AR and transmits them to the user as audio signals; and a power module (104) that charges a secondary battery and is equipped with a first power source VDD1-GND1 of the charged secondary battery and a second power source VDD2-GND2 as a second power source with separated voltage and ground, thereby providing the Bluetooth The module (200) is configured to have VDD2 and GND2 of the second power supply connected to it, and the hearing aid module (300) and the audio output amplifier module (400) are configured to have VDD1 and GND1 of the first power supply connected to them.

[0080] The configuration of the present invention as described above can completely block noise generated from the Bluetooth module (200) by separating and supplying the power of the Bluetooth module (200), the hearing aid module (300), and the audio output amplifier module (400) into the first power supply VDD1-GND1 and the second power supply VDD2-GND2.

[0081]

[0082] Figure 10 illustrates the configuration of a matching circuit as another embodiment of a hearing aid equipped with a Bluetooth audio function for blocking Bluetooth noise signals according to the present invention. This configuration illustrates a matching circuit for a hearing aid module (300) and an audio output amplifier module (400) for the aforementioned hearing aid equipped with a Bluetooth audio function for blocking Bluetooth noise signals, wherein the hearing aid module (300) and the audio output amplifier module (400) are driven by a first power source and the Bluetooth module (200) is driven by a second power source, thereby blocking the hearing aid module (300) and the audio output amplifier module (400) from noise generated from the Bluetooth module (200).

[0083] The matching circuit is;

[0084] The left output signal HL of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A1 and connected to a non-inverting buffer whose output is feedback-connected to the inverting input, so that the left output signal HL is output to operational amplifier A1. The output of A1 is connected to inverting amplifier A2, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R1, and the feedback resistance between the inverting input terminal and the output is R2. In this case, when R1=R2, the output of A2 becomes the inverted signal of the left output signal HL, and is output as two signals, including the non-inverted left output signal HL of A1. Here, the power supply and ground of A1 and A2 are provided by VDD2-GND2 of the second power supply.

[0085] The inverted / non-inverted signals of the left output signal HL, which is output by the above A1 and A2, are connected to a differential amplifier composed of the input resistor Ra of the inverting input terminal of operational amplifier A5, the feedback resistor Rb connected from the output terminal to the inverting input terminal, the input resistor Rc of the non-inverting input terminal, and the resistor Rd connected between ground and the inverting input terminal; wherein the non-inverted left output signal HL of the aforementioned A1 is connected to the input resistor Rc of the non-inverting input terminal of A5, and the inverted left output signal HL of A2 is connected to the input resistor Ra of the inverting input terminal of A5. Here, the power supply and ground of A5 are provided with VDD1-GND1 of the first power supply.

[0086] At this time, if the resistors R1=R2 and Ra=Rb=Rc=Rd, the differential output of A5 is the non-inverted signal of the left output signal HL - the inverted signal of the left output signal HL; thus, it can be seen that the output of A5 is the voltage difference between A1 and A2.

[0087] Next,

[0088] The right output signal HR of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A3 and connected to a non-inverting buffer where the output is feedback-connected to the inverting input, so that the left output signal HL is output to operational amplifier A3. The output of A3 is connected to inverting amplifier A4, where the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R3, and the feedback resistance between the inverting input terminal and the output is R4. In this case, when R3=R4, the output of A4 becomes the inverted signal of the right output signal HR, and is output as two signals, including the non-inverted right output signal HR of A3. Here, the power and ground of A3 and A4 are provided by VDD2-GND2 of the second power supply.

[0089] The inverted / non-inverted signals of the right output signal HR produced by the above A3 and A4 are connected to a differential amplifier composed of the input resistor Re of the inverting input terminal of operational amplifier A6, a feedback resistor Rf connected from the output terminal to the inverting input terminal, the input resistor Rg of the non-inverting input terminal, and a resistor Rh connected between ground and the inverting input terminal; wherein the non-inverted right output signal HR of the aforementioned A3 is connected to the input resistor Rg of the non-inverting input terminal of A6, and the inverted right output signal HR of A4 is connected to the input resistor Re of the inverting input terminal of A6. Here, the power supply and ground of A6 are provided by VDD1-GND1 of the first power supply.

[0090] At this time, if the resistors R3=R4 and Re=Rf=Rg=Rh, the differential output of A6 is the non-inverted signal of the right output signal HR minus the inverted signal of the left output signal HL; thus, it can be seen that the output of A6 is the voltage difference between A3 and A4.

[0091] The configuration of the matching circuit of the hearing aid equipped with the above-described Bluetooth audio function is characterized by driving the circuit with a power supply in which voltage and ground are separated into a first power supply and a second power supply to block noise signals generated from the Bluetooth module (200), and additionally transmitting the output BL and BR signals of the Bluetooth module (200) to an audio output amplifier module (400) selected by a mode switching switch (310).

[0092]

[0093] Figure 11 illustrates a detailed configuration as another embodiment of a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals according to the present invention. This configuration is such that, for the aforementioned hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, the hearing aid module (300) and the audio output amplifier module (400) are driven by a first power source and the Bluetooth module (200) is driven by a second power source, thereby blocking the hearing aid module (300) and the audio output amplifier module (400) from noise generated from the Bluetooth module (200).

[0094] A hearing aid of the present invention equipped with a Bluetooth audio function that blocks Bluetooth noise signals;

[0095] The device comprises a power supply unit (110) that charges and outputs a secondary battery (130), a power module (104) in which the output voltage VDD and ground GND of the charged secondary battery (130) pass through a switch (120) to provide a first power supply VDD1-GND1, and an isolated DC-DC converter (140) with separated voltage and ground to provide a second power supply VDD2-GND2 using the first power supply as an input.

[0096] A Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR, and

[0097] A matching circuit that takes the outputs BL and BR of the above Bluetooth module (200) as inputs and provides a matching output corresponding thereto,

[0098] A hearing aid module (300) comprising: a left hearing aid amplifier (302L) that amplifies the signal of a left microphone (300L) and compensates for gain in response to the user's hearing, and a left volume controller (304L) that adjusts the gain of the output signal to output a left hearing aid signal HL; a right hearing aid amplifier (302R) that amplifies the signal of a right microphone (300R) and compensates for gain in response to the user's hearing, and a right volume controller (304R) that adjusts the gain of the output signal to output a right hearing aid signal HR;

[0099] A mode switching switch (330) for selecting the left and right outputs HL and HR of the Bluetooth module (200) via the matching circuit and the outputs HL and HR of the hearing aid module (300), respectively.

[0100] An audio output amplifier module (400) that receives the outputs BL and BR of a Bluetooth module (200) selected by the mode switching switch (330), or the outputs HL and HR of a hearing aid module (300), amplifies them into left and right signals of AL and AR using a left audio amplifier (402L) and a right audio amplifier (402R), respectively, and transmits them to the user as audio signals;

[0101] Equipped with,

[0102] The above Bluetooth module (200) is characterized by being configured to drive the power of the second power supply VDD2-GND2, the hearing aid module (300), and the audio output amplifier module (400) by separating the power of the first power supply VDD1-GND1.

[0103] The above matching circuit is;

[0104] Operational amplifiers A1 and A2 driven by VDD2-GND2 of the second power supply are provided, and the left output signal HL of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A1 and output, and the non-invertedly amplified signal of said operational amplifier A1 is received and invertedly amplified by operational amplifier A2 and output.

[0105] A differential amplifier is provided, comprising an operational amplifier A5 driven by VDD1-GND1 of the first power supply, wherein the non-inverted left output signal HL of A1 is connected to the non-inverted input of A5, and the inverted left output signal HL of A2 is connected to the inverted input terminal of A5, so that the output of A5 is connected to a mode switching switch (330).

[0106] Operational amplifiers A3 and A4 driven by VDD2-GND2 of the second power supply are provided, and the right output signal HR of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A3 and output, and the signal non-invertedly amplified by operational amplifier A3 is received and invertedly amplified by operational amplifier A4 and output.

[0107] A differential amplifier is provided, comprising an operational amplifier A6 driven by VDD1-GND1 of the first power supply, wherein the non-inverted right output signal HR of A3 is connected to the non-inverted input of A6, and the inverted right output signal HR of A4 is connected to the inverted input terminal of A6, so that the output of A6 is connected to the mode switching switch (330).

[0108]

[0109] According to the Bluetooth audio hearing aid of the present invention that blocks Bluetooth noise signals as described above, the power of the Bluetooth module (200), the hearing aid module (300), and the audio output amplifier module (400) is separated and supplied as VDD1-GND1 of the first power supply and VDD2-GND2 of the second power supply, and the left and right outputs BL and BR of the Bluetooth module (200) are transmitted as signals of input AR and AL of the audio output amplifier module (400), thereby having a technical feature of completely blocking noise generated from the Bluetooth module (200).

[0110]

[0111] Although the Bluetooth audio hearing aid technology for blocking Bluetooth noise signals of the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

[0112]

[0113] The present invention can be industrially utilized in the field of hearing aid technology for blocking noise signals generated from a Bluetooth module.

Claims

1. In a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, A power supply unit (110) that charges and outputs a secondary battery (130); and, The power module (104) provides a first power supply VDD1-GND1 through a switch (120) with the output voltage VDD and ground GND of the charged secondary battery (130), and provides a second power supply VDD2-GND2 through an isolated DC-DC converter (140) with separated voltage and ground using the first power supply as an input. A Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR; and A matching circuit that takes the outputs BL and BR of the above Bluetooth module (200) as inputs and provides a corresponding matching output; A hearing aid module (300) comprising: a left hearing aid amplifier (302L) that amplifies the signal of a left microphone (300L) and compensates for gain in response to the user's hearing, and a left volume controller (304L) that adjusts the gain of the output signal to output a left hearing aid signal HL; a right hearing aid amplifier (302R) that amplifies the signal of a right microphone (300R) and compensates for gain in response to the user's hearing, and a right volume controller (304R) that adjusts the gain of the output signal to output a right hearing aid signal HR; A mode switching switch (330) for selecting the left and right outputs HL and HR of the Bluetooth module (200) via the matching circuit and the outputs HL and HR of the hearing aid module (300), respectively; An audio output amplifier module (400) that receives the outputs BL and BR of a Bluetooth module (200) selected by the mode switching switch (330), or the outputs HL and HR of a hearing aid module (300), amplifies them into left and right signals of AL and AR using a left audio amplifier (402L) and a right audio amplifier (402R), respectively, and transmits them to the user as audio signals; Equipped with, The above Bluetooth module (200) is VDD1-GND1 of the first power supply, A hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, characterized in that the power of the hearing aid module (300) and the audio output amplifier module (400) is configured to be driven by separating the power of the second power supply VDD2-GND2.

2. In paragraph 1, the matching circuit above is; Operational amplifiers A1 and A2 driven by VDD1-GND1 of the first power supply are provided, and the left output signal HL of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A1 and output, and the non-invertedly amplified signal of said operational amplifier A1 is received and invertedly amplified by operational amplifier A2 and output. A differential amplifier is provided, comprising an operational amplifier A5 driven by VDD2-GND2 of the second power supply, wherein the non-inverted left output signal HL of A1 is connected to the non-inverted input of A5, and the inverted left output signal HL of A2 is connected to the inverted input terminal of A5, so that the output of A5 is connected to a mode switching switch (330). Operational amplifiers A3 and A4 driven by VDD1-GND1 of the first power supply are provided, and the right output signal HR of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A3 and output, and the signal non-invertedly amplified by operational amplifier A3 is received and invertedly amplified by operational amplifier A4 and output. A hearing aid having a Bluetooth audio function that blocks Bluetooth noise signals, characterized by having a differential amplifier configured with an operational amplifier A6 driven by VDD2-GND2 of the second power supply, wherein the non-inverted right output signal HR of A3 is connected to the non-inverted input of A6, and the inverted right output signal HR of A4 is connected to the inverted input terminal of A6, so that the output of A6 is connected to the mode switching switch (330).

3. In paragraph 2, the matching circuit above is; The left output signal HL of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A1, and the output is connected to a non-inverting buffer that is feedback connected to the inverting input, so that the left output signal HL is output; The output of the above A1 is connected to an inverting amplifier A2, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R1, and the feedback resistance between the inverting input terminal and the output is R2. The power and ground of A1 and A2 are connected to VDD1-GND1 of the first power supply, and The inverted / non-inverted signal of the left output signal HL, output by the above A1 and A2, is connected to a differential amplifier composed of an input resistor Ra of the inverting input terminal of operational amplifier A5, a feedback resistor Rb connected from the output terminal to the inverting input terminal, an input resistor Rc of the non-inverting input terminal, and a resistor Rd connected between ground and the inverting input terminal. The non-inverted left output signal HL of A1 is connected to the input resistor Rc of the non-inverted input terminal of A5, and the inverted left output signal HL of A2 is connected to the input resistor Ra of the inverted input terminal of A5, and The power and ground of A5 are connected to VDD2-GND2 of the second power supply, and The right output signal HR of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A3 and connected to a non-inverting buffer whose output is feedback connected to the inverting input, so that the left output signal HL is output to operational amplifier A3, and The output of the above A3 is connected to an inverting amplifier A4, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R3, and the feedback resistance between the inverting input terminal and the output is R4. The power and ground of the above A3 and A4 are connected to VDD1-GND1 of the first power supply, and The inverted / non-inverted signal of the right output signal HR, which is output by the above A3 and A4, is connected to a differential amplifier A6 composed of an input resistor Re of the inverting input terminal of operational amplifier A6, a feedback resistor Rf connected from the output terminal to the inverting input terminal, an input resistor Rg of the non-inverting input terminal, and a resistor Rh connected between ground and the inverting input terminal. The non-inverted right output signal HR of the above A3 is connected to the input resistor Rg of the non-inverted input terminal of A6, and the inverted right output signal HR of A4 is connected to the input resistor Re of the inverted input terminal of A6, and A hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, characterized in that the power and ground of A6 are configured to be connected to VDD2-GND2 of the second power supply.

4. In a hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, A power supply unit (110) that charges and outputs a secondary battery (130); and, A power module (104) in which the output voltage VDD and ground GND of the charged secondary battery (130) provide a first power supply VDD1-GND1 via a switch (120), and a second power supply VDD2-GND2 is provided as an isolated DC-DC converter (140) with voltage and ground separated, using the first power supply as an input; A Bluetooth module (200) that is paired with a mobile device, etc., receives an audio signal, and outputs left and right signals BL and BR; and A matching circuit that takes the outputs BL and BR of the above Bluetooth module (200) as inputs and provides a corresponding matching output; A hearing aid module (300) comprising: a left hearing aid amplifier (302L) that amplifies the signal of a left microphone (300L) and compensates for gain in response to the user's hearing, and a left volume controller (304L) that adjusts the gain of the output signal to output a left hearing aid signal HL; a right hearing aid amplifier (302R) that amplifies the signal of a right microphone (300R) and compensates for gain in response to the user's hearing, and a right volume controller (304R) that adjusts the gain of the output signal to output a right hearing aid signal HR; A mode switching switch (330) for selecting the left and right outputs HL and HR of the Bluetooth module (200) via the matching circuit and the outputs HL and HR of the hearing aid module (300), respectively; An audio output amplifier module (400) that receives the outputs BL and BR of a Bluetooth module (200) selected by the mode switching switch (330), or the outputs HL and HR of a hearing aid module (300), amplifies them into left and right signals of AL and AR using a left audio amplifier (402L) and a right audio amplifier (402R), respectively, and transmits them to the user as audio signals; Equipped with, A hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, characterized in that the above Bluetooth module (200) is configured to drive the power of the second power supply VDD2-GND2, the hearing aid module (300), and the audio output amplifier module (400) by separating the power of the first power supply VDD1-GND1.

5. In paragraph 4, the above matching circuit is; Operational amplifiers A1 and A2 driven by VDD2-GND2 of the second power supply are provided, and the left output signal HL of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A1 and output, and the non-invertedly amplified signal of said operational amplifier A1 is received and invertedly amplified by operational amplifier A2 and output. A differential amplifier is provided, comprising an operational amplifier A5 driven by VDD1-GND1 of the first power supply, wherein the non-inverted left output signal HL of A1 is connected to the non-inverted input of A5, and the inverted left output signal HL of A2 is connected to the inverted input terminal of A5, so that the output of A5 is connected to a mode switching switch (330). Operational amplifiers A3 and A4 driven by VDD2-GND2 of the second power supply are provided, and the right output signal HR of the Bluetooth module (200) is non-invertedly amplified by operational amplifier A3 and output, and the signal non-invertedly amplified by operational amplifier A3 is received and invertedly amplified by operational amplifier A4 and output. A hearing aid having a Bluetooth audio function that blocks Bluetooth noise signals, characterized by having a differential amplifier composed of an operational amplifier A6 driven by VDD1-GND1 of the first power supply, wherein the non-inverted right output signal HR of A3 is connected to the non-inverted input of A6, and the inverted right output signal HR of A4 is connected to the inverted input terminal of A6, so that the output of A6 is connected to the mode switching switch (330).

6. In paragraph 5, the above matching circuit is; The above matching circuit is; The left output signal HL of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A1, and the output is connected to a non-inverting buffer that is feedback connected to the inverting input, so that the left output signal HL is output; The output of the above A1 is connected to an inverting amplifier A2, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R1, and the feedback resistance between the inverting input terminal and the output is R2. The power and ground of A1 and A2 are connected to VDD2-GND2 of the second power supply, and The inverted / non-inverted signal of the left output signal HL, output by the above A1 and A2, is connected to a differential amplifier composed of an input resistor Ra of the inverting input terminal of operational amplifier A5, a feedback resistor Rb connected from the output terminal to the inverting input terminal, an input resistor Rc of the non-inverting input terminal, and a resistor Rd connected between ground and the inverting input terminal. The non-inverted left output signal HL of A1 is connected to the input resistor Rc of the non-inverted input terminal of A5, and the inverted left output signal HL of A2 is connected to the input resistor Ra of the inverted input terminal of A5, and The power and ground of A5 are connected to VDD1-GND1 of the first power supply, and The right output signal HR of the Bluetooth module (200) is connected to the non-inverting input of operational amplifier A3 and connected to a non-inverting buffer whose output is feedback connected to the inverting input, so that the left output signal HL is output to operational amplifier A3, and The output of the above A3 is connected to an inverting amplifier A4, in which the non-inverting input is connected to ground GND1, the input resistance of the inverting input terminal is R3, and the feedback resistance between the inverting input terminal and the output is R4. The power and ground of the above A3 and A4 are connected to VDD2-GND2 of the second power supply, and The inverted / non-inverted signal of the right output signal HR, which is output by the above A3 and A4, is connected to A6 of a differential amplifier composed of the input resistor Re of the inverting input terminal of operational amplifier A6, the feedback resistor Rf connected from the output terminal to the inverting input terminal, the input resistor Rg of the non-inverting input terminal, and the resistor Rh connected between ground and the inverting input terminal. The non-inverted right output signal HR of the above A3 is connected to the input resistor Rg of the non-inverted input terminal of A6, and the inverted right output signal HR of A4 is connected to the input resistor Re of the inverted input terminal of A6, and A hearing aid equipped with a Bluetooth audio function that blocks Bluetooth noise signals, characterized in that the power and ground of A6 are configured to be connected to VDD1-GND1 of the first power supply.

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