Audio output method and device, readable storage medium and computer program product

Abstract

The invention discloses an audio output method and device, a readable storage medium and a computer program product, and relates to the technical field of signal processing, the audio output method and device are applied to an audio device, the audio device comprises a main loudspeaker unit and a secondary loudspeaker unit, and the method comprises the following steps: obtaining a to-be-output original signal, and obtaining a target signal based on the original signal; an original signal is output through the main loudspeaker unit, and a target signal is output through the secondary loudspeaker unit; wherein if the secondary loudspeaker unit is positively connected, the original signal and the target signal are opposite in phase and identical in signal amplitude in the preset frequency range; and if the secondary loudspeaker unit is reversely connected, the original signal and the target signal have the same phase and the same signal amplitude in the preset frequency range. According to the invention, the privacy of the open type earphone is improved.

Description

Technical Field

[0001] The present application relates to the field of signal processing technology, and in particular to an audio output method, device, readable storage medium and computer program product. Background Art

[0002] Audio devices such as open-ear wearable speakers (OWS) are very popular because they are comfortable to wear and do not feel blocked. However, due to the unwrapped design of open-ear headphones, during the sound conduction process, the sound played in the wearer's ear canal will also be conducted to the free space around the wearer through the air. Therefore, there is a common problem of sound leakage, which leaks user privacy and has poor privacy.

[0003] Therefore, when using open-type headphones, how to improve the privacy of the open-type headphones is a technical problem that needs to be solved urgently in the technical field. Summary of the invention

[0004] The main purpose of the present application is to provide an audio output method, device, readable storage medium and computer program product, aiming to solve the technical problem of how to improve the privacy of open-back headphones when using them.

[0005] To achieve the above object, the present application provides an audio output method, which is applied to an audio device, wherein the audio device includes a main speaker unit and a secondary speaker unit, and the audio output method includes the following steps:

[0006] Acquire an original signal to be output, and obtain a target signal based on the original signal;

[0007] Output the original signal through the main speaker unit, and output the target signal through the secondary speaker unit;

[0008] Wherein, if the secondary speaker unit is connected in a positive direction, the original signal and the target signal have opposite phases and the same signal amplitudes within a preset frequency range;

[0009] If the secondary speaker unit is connected in reverse, the original signal and the target signal have the same phase and the same signal amplitude within a preset frequency range.

[0010] In one embodiment, the sub-speaker unit is reversely connected, and the step of obtaining the target signal based on the original signal comprises:

[0011] Filtering the original signal to obtain a first filtered signal and a second filtered signal, wherein the first filtered signal is a signal whose signal frequency belongs to the preset frequency range, and the second filtered signal is a signal whose signal frequency does not belong to the preset frequency range;

[0012] Obtaining a first signal based on the first filtered signal, wherein the first signal has the same phase and the same signal amplitude as the first filtered signal;

[0013] obtaining a second signal based on the second filtered signal, wherein the second signal has an opposite phase to the second filtered signal;

[0014] The first signal and the second signal are combined to obtain a target signal.

[0015] In one embodiment, the audio device further includes an inverter and an equalizer connected in sequence, and the step of obtaining the second signal based on the second filtered signal includes:

[0016] Inputting the second filtered signal to the inverter to output an inverted signal;

[0017] The inverted signal is input to the equalizer, and a second signal is output.

[0018] In one embodiment, the audio device further includes a low-pass filter, a high-pass filter and a band-pass filter, the cut-off frequency of the low-pass filter is the lower limit of the preset frequency range, the cut-off frequency of the high-pass filter is the upper limit of the preset frequency range, the passband frequency range of the band-pass filter is the preset frequency range, and the step of filtering the original signal to obtain the first filtered signal and the second filtered signal includes:

[0019] Input the original signal to the low-pass filter, and output a low-frequency signal;

[0020] Input the original signal to the high-pass filter, and output a high-frequency signal;

[0021] Input the original signal to the bandpass filter, and output a medium-high frequency signal;

[0022] The medium and high frequency signals are determined as first filtered signals, and the low frequency signals and the high frequency signals are determined as second filtered signals.

[0023] In one embodiment, the audio device further includes a first power amplifier and a second power amplifier, the first power amplifier is connected to the main speaker unit, the second power amplifier is connected to the secondary speaker unit, and before the step of outputting the original signal through the main speaker unit and outputting the target signal through the secondary speaker unit, the method further includes:

[0024] Inputting the original signal into the first power amplifier, so that the first power amplifier amplifies the original signal and then drives it to the main speaker unit for output;

[0025] The original signal is input into the second power amplifier, so that the target signal is amplified by the second power amplifier and then driven to the sub-speaker unit for output.

[0026] In one embodiment, the preset frequency range is a frequency range between a front cavity resonance frequency of the sub-speaker unit and a rear cavity resonance frequency of the sub-speaker unit.

[0027] In one embodiment, the resonant frequency of the rear cavity of the sub-speaker unit is less than 2K Hz, and the resonant frequency of the front cavity of the sub-speaker unit is greater than the resonant frequency of the rear cavity of the sub-speaker unit.

[0028] In addition, to achieve the above-mentioned purpose, the present application also provides an audio device, which includes a main speaker unit, a secondary speaker unit and a processor, the main speaker unit and the secondary speaker unit are respectively connected to the processor, and the processor is used to execute the steps of the audio output method as described above.

[0029] In addition, to achieve the above-mentioned purpose, the present application also provides a readable storage medium, which is a computer-readable storage medium, and a program for implementing the audio output method is stored on the computer-readable storage medium. The program for implementing the audio output method is executed by a processor to implement the steps of the audio output method as described above.

[0030] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned audio output method when executed by a processor.

[0031] One or more technical solutions proposed in this application have at least the following technical effects:

[0032] A main speaker unit and a secondary speaker unit are arranged in the audio device, and the original signal is outputted through the main speaker unit. When the secondary speaker unit is connected forwardly, the target signal with the same signal amplitude and opposite phase to the original signal in the preset frequency range is outputted through the secondary speaker unit. When the secondary speaker unit is connected reversely, the target signal with the same phase and same signal amplitude as the original signal is outputted through the secondary speaker unit. It can be understood that when the speaker is connected reversely, the signal outputted by it will also be reversed. That is, within the preset frequency range, the secondary speaker unit generates a target signal with the opposite phase and signal amplitude to the main speaker unit, so that the audio signals generated by the main speaker unit and the secondary speaker unit interfere with each other within the preset frequency range, so that the wearer of other non-audio devices cannot hear the audio signal within the preset frequency range, thereby improving the privacy of the audio device when the wearer uses the audio device. As an audio device, open-type headphones can naturally improve the privacy of open-type headphones when the technical solution proposed in this application is applied to open-type headphones. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 This is a flowchart of the first embodiment of the audio output method of the present application;

[0036] Figure 2 This is a schematic diagram of the structure of a speaker unit involved in an embodiment of the audio output method of the present application;

[0037] Figure 3 This is a schematic diagram of a process of obtaining a target signal according to an embodiment of the audio output method of the present application;

[0038] Figure 4 This is another schematic diagram of a process of obtaining a target signal according to an embodiment of the audio output method of the present application;

[0039] Figure 5 This is another schematic diagram of a process of obtaining a target signal according to an embodiment of the audio output method of the present application;

[0040] Figure 6 This is a schematic diagram of the structure of the audio output device of the present application;

[0041] Figure 7 Schematic diagram of the device structure of the hardware operating environment involved in the audio output device in the embodiment of the present application.

[0042] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0044] With the development of virtual reality and open wireless headsets (OWS), near-ear open audio devices are increasingly favored by users for their comfortable wearing experience. Due to a certain degree of distance from the ear canal (compared to in-ear and semi-open headphones) and the compromise of wearing comfort, this type of product also has relatively unfavorable acoustic conditions. It faces two biggest acoustic problems: one is insufficient low frequency. Due to the characteristics of the open type, its radiation condition changes from pressure field to near free field, resulting in the sound radiation characteristics tending to the second-order high-pass form. Due to leakage, the low-frequency response decays rapidly. For all kinds of near-ear open audio devices currently available, the frequency response below 400Hz begins to decay; the second is the privacy problem caused by sound leakage. Due to a certain degree of distance from the ear canal, in order to achieve sufficient loudness, compared with headphones, this type of device requires the speaker to produce a larger amplitude to meet the wearer's loudness requirements, but this also causes a large amount of sound to leak to the far field, so that people near the wearer can also hear the playback content, causing sound leakage problems and resulting in reduced privacy.

[0045] In order to solve this problem, the dipole acoustic design method can be used: actively open the rear cavity of the speaker, introduce an acoustic short circuit, localize the sound waves near the near field, and improve privacy. At the same time, the open rear cavity reduces the stiffness of the speaker, and the low-frequency amplitude is also significantly improved. However, this type of design method also has significant shortcomings: First, the low-frequency acoustic short circuit. For the near field, the open rear cavity also introduces the interference problem of the front and rear sound radiation, resulting in sound cancellation in the anti-phase frequency band, causing the reduction of the mid- and low-frequency; second, the privacy band is narrow. Due to the many series and parallel resonance characteristics of the acoustic system of the speaker diaphragm and the front and rear cavities, the front and rear cavity sound radiation amplitude and phase begin to mismatch after certain mid- and high-frequency frequencies, which no longer meet the acoustic conditions of the dipole, resulting in the failure of the acoustic short circuit, and even causing the sound radiation to be enhanced, causing the product acoustic privacy design to fail, and causing sound leakage.

[0046] Based on this, the main solution of the present application is: the audio device is provided with a main speaker unit and a secondary speaker unit, an original signal to be output is obtained, and a target signal is obtained based on the original signal; the original signal is output through the main speaker unit, and the target signal is output through the secondary speaker unit; wherein, if the secondary speaker unit is connected forwardly, the original signal and the target signal have opposite phases and the same signal amplitudes within a preset frequency range; if the secondary speaker unit is connected reversely, the original signal and the target signal have the same phases and the same signal amplitudes within a preset frequency range.

[0047] The present application sets a main speaker unit and a secondary speaker unit in an audio device, and outputs an original signal through the main speaker unit. When the secondary speaker unit is connected forwardly, the secondary speaker unit outputs a target signal with a phase opposite to that of the original signal and the same signal amplitude within a preset frequency range. When the secondary speaker unit is connected reversely, the secondary speaker unit outputs a target signal with the same phase and signal amplitude as the original signal. It can be understood that when the speaker is connected reversely, the signal output by it will also be reversed. That is, within the preset frequency range, the secondary speaker unit generates a target signal with a phase opposite to that of the main speaker unit and a signal amplitude, so that the audio signals generated by the main speaker unit and the secondary speaker unit interfere with each other within the preset frequency range, so that the wearer of other non-audio devices cannot hear the audio signal within the preset frequency range, thereby improving the privacy of the audio device when the wearer uses the audio device. As an audio device, open-type headphones can naturally improve the privacy of open-type headphones when the technical solution proposed in the present application is applied to the open-type headphones.

[0048] It should be noted that the execution subject of each embodiment of the audio output method of the present application may be an audio device capable of realizing the above functions, such as an OWS headset, etc. Exemplarily, the OWS headset is taken as an example to illustrate and describe each embodiment of the audio output method of the present application.

[0049] Based on this, the present application proposes an audio output method of the first embodiment, wherein the audio device includes a secondary speaker unit and a main speaker unit, please refer to Figure 1 , the audio output method comprises steps S10 to S20:

[0050] Step S10, obtaining an original signal to be output, and obtaining a target signal based on the original signal;

[0051] Among them, if the secondary speaker unit is connected forwardly, the original signal and the target signal have opposite phases and the same signal amplitudes within the preset frequency range; if the secondary speaker unit is connected reversely, the original signal and the target signal have the same phases and the same signal amplitudes within the preset frequency range.

[0052] The main speaker unit may be the unit that mainly outputs sound in the OWS headset, responsible for producing the main audio content, which generally has a higher power handling capability and better sound quality performance to ensure the clarity and dynamic range of the sound. The secondary speaker unit may be a unit used to supplement the audio experience and be responsible for active control of sound leakage.

[0053] Reference Figure 2 As shown, the main speaker unit and the secondary speaker unit may be specifically a sound-generating unit including at least one speaker 10 .

[0054] Further, refer to Figure 2 As shown, the main speaker unit and the secondary speaker unit both include a front cavity 20 and a rear cavity 30, wherein the front cavity 20 is the space in front of the speaker, that is, the space in front of the speaker diaphragm, and the rear cavity 30 is the space behind the speaker, that is, the space behind the speaker diaphragm. Both the front cavity 20 and the rear cavity 30 can be fully or partially enclosed boxes.

[0055] Further, refer to Figure 2 As shown, the front cavity 20 and the rear cavity 30 are both partially closed boxes, the front cavity 20 has at least one sound outlet 201, and the rear cavity 30 has at least one sound outlet 301. That is, the main speaker unit and the speaker unit both have open front and rear cavities.

[0056] Further, refer to Figure 2 As shown, the volume of the secondary speaker unit is smaller than that of the main speaker unit.

[0057] Furthermore, the sound outlet hole of the front cavity in the main speaker unit faces the ear canal.

[0058] The sub-speaker unit can be connected forwardly or reversely. Forward connection means that the positive terminal of the speaker in the sub-speaker unit is connected to the positive output of the power amplifier, and the negative terminal of the speaker is connected to the negative output of the power amplifier. Reverse connection means that the positive terminal of the speaker in the sub-speaker unit is connected to the negative output of the power amplifier, and the negative terminal of the speaker is connected to the positive output of the power amplifier. Exemplarily, the sub-speaker unit is reversely connected to illustrate and describe the various embodiments of the present application.

[0059] When the secondary speaker unit is reversed, the target signal has the same phase and signal amplitude as the original signal within the preset frequency range. It should be noted that the preset frequency range may be a frequency range that is set in advance by relevant personnel and that they expect to be privately controlled. In layman's terms, the sound within the preset frequency range is expected to prevent the audio device from leaking into the external environment. For example, the preset frequency range may specifically be full-band, greater than 400 Hz, less than 5K Hz, greater than or equal to 400 Hz and less than or equal to 5K Hz, etc. This embodiment does not impose specific restrictions on this. In a specific embodiment, considering that the frequency band in which the human ear is most sensitive to sound leakage from headphones is usually in the mid-frequency region, especially the frequency band from 1K Hz to 3K Hz, the preset frequency range may be from 1K Hz to 3K Hz.

[0060] Outside the preset frequency range, the phase of the target signal and the original signal may be the same or opposite, or have other relationships, and the signal amplitude of the target signal may be any value, which is not specifically limited in this embodiment. In layman's terms, outside the preset frequency range, the target signal may be any signal (including no signal, i.e., a null signal).

[0061] To obtain the target signal, the original signal may be filtered to filter out the original signal within a preset frequency range, and then the target signal is obtained based on the filtered original signal. For example, assuming that the preset frequency range is less than or equal to 3K Hz, refer to Figure 3 As shown, the low-pass filter with a cutoff frequency of 3K Hz can be set to convert the original ( Figure 3 The input signal shown in the figure is copied and input to the low-pass filter, and the original signal less than or equal to 3K Hz is screened out. The phase amplitude control is performed on the screened signal, and the target signal with the same phase and signal amplitude as the original signal is generated through the phase amplitude control. The target signal is driven to the sub-speaker unit ( after passing through the DAC (Digital-to-Analog Converter) and the power amplifier. Figure 3 The secondary unit shown in the figure outputs the original signal and drives it to the main speaker unit ( Figure 3 It can be understood that, at this time, the target signal is a null signal outside the preset frequency range.

[0062] Further, the frequency range in which the frequency response of the main speaker unit is less than the preset value is used as the attenuation frequency range. Considering that the frequency response of the speaker in the attenuation frequency range is usually low, the audio performance of the OWS headset in the attenuation frequency range is poor, and the wearer is also difficult to hear the sound in the attenuation frequency range, which affects the wearer's hearing. For example, the speaker usually begins to attenuate at a frequency response below 400 Hz, and the wearer is also difficult to hear low-frequency sounds. Based on this, in a preferred embodiment, the preset frequency range may only include part of or not include the attenuation frequency range, that is, the attenuation frequency range is partially or completely not within the preset frequency range. And outside the preset frequency range, the phase of the target signal is the same as the original signal. In this way, outside the preset frequency range, the secondary speaker unit and the main speaker unit can work together to enhance the audio of the main speaker unit in the attenuation frequency range, and at the same time, the audio in the preset frequency range with better frequency response is privately controlled, thereby taking into account both the privacy of the OWS headset and the audio performance of the OWS headset in the full frequency band, thereby improving the wearer's hearing.

[0063] Furthermore, the preset value mentioned above may be a value set in advance by relevant personnel based on experience or experimental summary. When the frequency response is lower than this value, the user will usually not hear the sound, or feel that certain characteristics of the sound are missing.

[0064] Step S20, outputting the original signal through the main speaker unit, and outputting the target signal through the secondary speaker unit;

[0065] After obtaining the target signal, the target signal is driven into the secondary speaker unit, and the original signal is driven into the main speaker unit, so that the main speaker unit and the secondary speaker unit output corresponding signals, thereby generating signals with opposite phases and the same signal amplitude within the preset frequency range, thereby achieving noise reduction in the far field of sound waves and realizing privacy control within the preset frequency range.

[0066] It should be noted that after the main speaker unit and the secondary speaker unit output corresponding signals, the sound is not completely eliminated in the near field of the sound wave, so that the wearer of the OWS headset can hear the sound within the preset frequency range.

[0067] In this embodiment, a main speaker unit and a secondary speaker unit are arranged in the OWS earphone, and the main speaker unit outputs the original signal. When the secondary speaker unit is connected in a forward direction, the secondary speaker unit outputs the target signal with the same signal amplitude and opposite phase to the original signal in the preset frequency range. When the secondary speaker unit is connected in a reverse direction, the secondary speaker unit outputs the target signal with the same phase and same signal amplitude as the original signal. It can be understood that when the speaker is connected in a reverse direction, the signal output by the secondary speaker unit will also be reversed. That is, within the preset frequency range, the secondary speaker unit generates the target signal with the opposite phase and signal amplitude to the main speaker unit, so that the audio signals generated by the main speaker unit and the secondary speaker unit interfere with each other within the preset frequency range, so that other non-OWS earphone wearers cannot hear the audio signal generated by the OWS earphone within the preset frequency range, thereby improving the privacy of the OWS earphone when the wearer uses the OWS earphone.

[0068] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the first embodiment can be referred to the above description and will not be described in detail later. On this basis, the secondary speaker unit is reversely connected, and the step of obtaining the target signal based on the original signal includes:

[0069] Step A10, filtering the original signal to obtain a first filtered signal and a second filtered signal, wherein the first filtered signal is a signal whose signal frequency belongs to the preset frequency range, and the second filtered signal is a signal whose signal frequency does not belong to the preset frequency range;

[0070] It should be noted that the original signal can be filtered by one or more filters to obtain the first filtered signal and the second filtered signal, and each filter can be a low-pass filter, a band-pass filter or a high-pass filter. It is easy to understand that the relevant personnel can set one or more filters based on the preset frequency range to obtain the first filtered signal and the second filtered signal, and this embodiment does not make specific restrictions on this.

[0071] For example, refer to Figure 4 As shown, assuming that the preset frequency range is greater than or equal to 400 Hz, a high-pass filter with a cutoff frequency of 400 Hz can be set to filter the original signal to obtain a first filtered signal. Further, a low-pass filter with a cutoff frequency of less than or equal to 400 Hz can be set to filter the original signal to obtain a second filtered signal.

[0072] Step A20, obtaining a first signal based on the first filtered signal, wherein the first signal has the same phase and the same signal amplitude as the first filtered signal;

[0073] Step A30, obtaining a second signal based on the second filtered signal, wherein the second signal has a phase opposite to that of the second filtered signal;

[0074] Reference Figure 4 As shown, specifically, a second signal opposite to the second filtered signal can be obtained through an inverter.

[0075] It should be noted that the signal amplitude of the second signal can be any value, and this embodiment does not impose any specific limitation on this.

[0076] Step A40: Combine the first signal and the second signal to obtain a target signal.

[0077] The first signal and the second signal are combined to obtain a target signal. Figure 4 As shown, the first signal and the second signal may be added to obtain a target signal.

[0078] In this embodiment, the original signal is filtered to obtain a first filtered signal within a preset frequency range, and a second filtered signal not within the preset frequency range, to obtain a first signal with the same phase and the same signal amplitude as the first filtered signal, and to obtain a second signal with an opposite phase to the second filtered signal, and the first signal and the second signal are combined to obtain a target signal. In this way, within the preset frequency range, the target signal has the same signal amplitude and the same phase as the original signal, and privacy control is achieved within the preset frequency range; and outside the preset frequency range, the target signal has an opposite phase to the original signal, and the audio in this frequency band is enhanced, thereby taking into account both the privacy and audio performance of the OWS headset.

[0079] In a possible implementation manner, the audio device further includes an inverter and an equalizer connected in sequence, and the step of obtaining the second signal based on the second filtered signal includes:

[0080] Step B10, inputting the second filtered signal into the inverter, and outputting an inverted signal;

[0081] Step B20, input the inverted signal to the equalizer, and output a second signal.

[0082] It should be noted that relevant personnel can set the parameters of the equalizer according to the actual audio effects required to obtain the expected second signal, and this example does not make any specific restrictions on this.

[0083] In one possible implementation, refer to Figure 5As shown, the audio device further includes a low-pass filter, a high-pass filter and a band-pass filter, the cut-off frequency of the low-pass filter is the lower limit of the preset frequency range, the cut-off frequency of the high-pass filter is the upper limit of the preset frequency range, the passband frequency range of the band-pass filter is the preset frequency range, and the step of filtering the original signal to obtain the first filtered signal and the second filtered signal includes:

[0084] Step C10, inputting the original signal into the low-pass filter, and outputting a low-frequency signal;

[0085] It should be noted that when the preset frequency range is a range with a lower limit value and an upper limit value, a low-pass filter, a high-pass filter and a band-pass filter can be set in the OWS headset to filter the original signal.

[0086] Note that the lower limit value of the preset frequency range is fc1, and the upper limit value is fc2. The cutoff frequency of the low-pass filter can be set to fc1, the cutoff frequency of the high-pass filter can be set to fc2, the low-frequency cutoff frequency of the band-pass filter can be set to fc1, and the high-frequency cutoff frequency of the band-pass filter can be set to fc2, so that the passband frequency range of the band-pass filter is the preset frequency range.

[0087] It should be noted that the preset frequency range is (fc1, fc2), (fc1, fc2], [fc1, fc2) or [fc1, fc2], and the lower limit value of the preset frequency range can be determined as fc1, and the upper limit value can be determined as fc2.

[0088] Step C20, inputting the original signal into the high-pass filter, and outputting a high-frequency signal;

[0089] Step C30, inputting the original signal into the bandpass filter, and outputting a medium-high frequency signal;

[0090] Step C40: determining the medium and high frequency signals as first filtered signals, and determining the low frequency signals and the high frequency signals as second filtered signals.

[0091] The low-frequency signal and the high-frequency signal are determined as the second filtered signal, so that after subsequent processing, the performance of the OWS headset in the low frequency and the high frequency can be enhanced.

[0092] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the first and second embodiments can be referred to the above description and will not be described in detail later. On this basis, the audio device further includes a first power amplifier and a second power amplifier, the first power amplifier is connected to the main speaker unit, the second power amplifier is connected to the secondary speaker unit, and before the step of outputting the original signal through the main speaker unit and outputting the target signal through the secondary speaker unit, the method further includes:

[0093] Step D10, inputting the original signal into the first power amplifier, so that the first power amplifier amplifies the original signal and then drives it to the main speaker unit for output;

[0094] Step D20: input the original signal into the second power amplifier, so that the target signal is amplified by the second power amplifier and then driven to the sub-speaker unit for output.

[0095] It should be noted that, refer to Figures 3 to 5 As shown, a DAC is also arranged before the power amplifier (including the first power amplifier and the second power amplifier). The target signal and the original signal are input to the corresponding speaker unit through the DAC and the power amplifier in turn for output.

[0096] In this embodiment, independent power amplifiers are respectively arranged before the main speaker unit and the secondary speaker unit to amplify the corresponding signals for output. In this way, the main speaker unit and the secondary speaker unit can output signals synchronously by controlling the first power amplifier and the second power amplifier to work synchronously, thereby improving the interference and destructive effect of the signals of the two and further improving the privacy of the OWS headphones.

[0097] In a possible implementation, the preset frequency range is a frequency range between a front cavity resonance frequency of the sub-speaker unit and a rear cavity resonance frequency of the sub-speaker unit.

[0098] The preset frequency range is set to the frequency range between the front cavity resonance frequency and the rear cavity resonance frequency of the sub-speaker unit. In this way, the preset frequency range and the frequency range between the front cavity resonance frequency and the rear cavity resonance frequency of the sub-speaker unit are consistent. Relevant personnel can adjust the front cavity and rear cavity resonance frequencies of the speaker to coincide with the frequency range where sound is prone to leakage, which can effectively enhance the attenuation of sound waves at these frequencies, thereby reducing the risk of sound leakage.

[0099] In a possible implementation, a resonant frequency of a rear cavity of the sub-speaker unit is less than 2K Hz, and a resonant frequency of a front cavity of the sub-speaker unit is greater than a resonant frequency of a rear cavity of the sub-speaker unit.

[0100] In this embodiment, the front cavity resonance frequency of the sub-speaker unit is greater than the rear cavity resonance frequency, and the rear cavity resonance frequency mainly affects the low-frequency part of the speaker. A lower rear cavity resonance frequency means that the speaker can resonate at a lower frequency, thereby improving the low-frequency response of the sub-speaker unit and the fullness of the sound; the front cavity resonance frequency mainly affects the high-frequency part, and a higher front cavity resonance frequency can make the high-frequency sound clearer and brighter; at the same time, the front cavity resonance frequency is greater than the rear cavity resonance frequency, which can avoid the appearance of a deeper trough in the mid-frequency band, resulting in a smaller sound, thereby reducing the distortion caused by resonance.

[0101] Exemplarily, in order to help understand the technical concept or technical principle of the audio output method after the present embodiment is combined with the first embodiment and the second embodiment, a specific embodiment is listed. In this specific embodiment, the audio output method is applied to OWS headphones, which include a main unit (also known as a main speaker unit), a secondary unit (also known as a secondary speaker unit), a power amplifier, a digital-to-analog converter, a low-pass filter, a high-pass filter, a band-pass filter, an inverter, an equalizer, and a digital signal processing unit.

[0102] Among them, the main unit is mainly used for the speaker unit that radiates sound waves. This unit is large in size and is mainly used to radiate sound waves to the human ear, constructing the main audio components and experience; the secondary unit is used to supplement the audio experience and is responsible for the active control of sound leakage. The acoustic structure of this unit needs to be finely designed, and there are two indicators: fc1 and fc2. fc1 represents its rear cavity parallel resonance frequency, and fc2 represents its front cavity parallel resonance frequency. The main unit and the secondary unit cavity are independent and do not share the cavity; the main unit diaphragm divides the main unit front cavity and the main unit rear cavity; the secondary unit diaphragm divides the secondary unit front cavity and the secondary unit rear cavity; the rear cavity is defined as the part that contains the speaker unit magnetic circuit system, and the front cavity is defined as the part that does not contain the magnetic circuit system. The secondary unit rear cavity parallel resonance frequency fc1 is less than 2kHz, and the secondary unit front cavity parallel resonance frequency fc2 is greater than fc1. The fc1 to fc2 frequency band is the secondary unit active privacy control working frequency band.

[0103] The power amplifier is used to amplify the signal to drive the speaker unit; the digital-to-analog converter is used to convert the digital signal into an analog signal; the digital signal processing unit is a computer unit used to implement the active control algorithm, which may be a single-chip microcomputer, FPGA (Field Programmable Gate Array) and various embedded computing units.

[0104] The low-pass filter cutoff frequency is set to fc1; the corresponding inverter and equalizer are set according to the effect performance. This frequency band utilizes the low-frequency response of the secondary unit and works with the main unit to enhance the low-frequency performance of the audio system;

[0105] The low-frequency cutoff frequency of the bandpass filter is set to fc1, and the high-frequency cutoff frequency is set to fc2. The phase amplitude control module makes the phase of the sound wave radiated by the secondary unit in this frequency band opposite to that of the main unit and the signal amplitude is the same; due to the frequency band higher than fc1, the sound wave of the rear sound outlet of the secondary unit is inverted. At this time, the secondary unit system is similar to the bass reflex box speaker, forming a two-stage in-phase sub-son. At this time, the far-field radiation capability of the secondary unit system is the strongest, which can be used to offset the sound wave radiated by the main unit, thereby realizing active privacy control;

[0106] The high-pass filter cutoff frequency is set to fc2, corresponding to the inverter, equalizer and effect performance settings. This frequency band utilizes the high-frequency response of the secondary unit and works with the main unit system to enhance the high-frequency performance of the audio. Since the secondary unit is usually smaller in size, its high-frequency performance is far better than the main unit. At this time, the system is similar to a high-low two-frequency audio system.

[0107] Based on this, refer to Figure 5 As shown, the audio output process is:

[0108] The input signal (i.e. the original signal) is divided into three paths and copied and input into the low-pass filter, band-pass filter and high-pass filter respectively. One signal passes through the low-pass filter, inverter and equalizer in turn, one signal passes through the band-pass filter and phase amplitude control in turn, and one signal passes through the high-pass filter, inverter and equalizer in turn. The three signals are merged, and the merged three signals are added and input into the DAC, and then pass through the DAC and the power amplifier in turn and are output through the secondary unit. At the same time, the input signal passes through the DAC and the power amplifier in turn and is output through the main unit.

[0109] The above strategies significantly improve the utilization rate of the secondary unit: in the low-frequency band, the secondary unit works as a sound-generating unit and cooperates with the main unit to improve the low-frequency response; in the fc1 to fc2 frequency band, the secondary unit works as a cancellation unit to enhance the sound privacy of the speaker system; in the high-frequency band, the secondary unit works as a tweeter to enhance the high-frequency performance of the audio.

[0110] It should be noted that the above examples are only used to assist in understanding the present application and do not constitute a limitation on the audio device structure and audio output method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0111] In addition, the present application also provides an audio output device, the audio output device includes an audio device, the audio device includes a main speaker unit and a secondary speaker unit, referring to Figure 6 As shown, the audio output device also includes:

[0112] An acquisition module 10 is used to acquire an original signal to be output, and obtain a target signal based on the original signal;

[0113] An output module 20, configured to output the original signal through the main speaker unit and output the target signal through the secondary speaker unit;

[0114] Wherein, if the secondary speaker unit is connected in a positive direction, the original signal and the target signal have opposite phases and the same signal amplitudes within a preset frequency range;

[0115] If the secondary speaker unit is connected in reverse, the original signal and the target signal have the same phase and the same signal amplitude within a preset frequency range.

[0116] In one embodiment, the acquisition module 10 is further used for:

[0117] Filtering the original signal to obtain a first filtered signal and a second filtered signal, wherein the first filtered signal is a signal whose signal frequency belongs to the preset frequency range, and the second filtered signal is a signal whose signal frequency does not belong to the preset frequency range;

[0118] Obtaining a first signal based on the first filtered signal, wherein the first signal has the same phase and the same signal amplitude as the first filtered signal;

[0119] obtaining a second signal based on the second filtered signal, wherein the second signal has an opposite phase to the second filtered signal;

[0120] The first signal and the second signal are combined to obtain a target signal.

[0121] In one embodiment, the audio device further includes an inverter and an equalizer connected in sequence, and the acquisition module 10 is further used to:

[0122] Inputting the second filtered signal to the inverter to output an inverted signal;

[0123] The inverted signal is input to the equalizer, and a second signal is output.

[0124] The audio device further includes a low-pass filter, a high-pass filter and a band-pass filter, the cut-off frequency of the low-pass filter is the lower limit of the preset frequency range, the cut-off frequency of the high-pass filter is the upper limit of the preset frequency range, the passband frequency range of the band-pass filter is the preset frequency range, and the acquisition module 10 is further used to:

[0125] Input the original signal to the low-pass filter, and output a low-frequency signal;

[0126] Input the original signal to the high-pass filter, and output a high-frequency signal;

[0127] Input the original signal to the bandpass filter, and output a medium-high frequency signal;

[0128] The medium and high frequency signals are determined as first filtered signals, and the low frequency signals and the high frequency signals are determined as second filtered signals.

[0129] The audio device further includes a first power amplifier and a second power amplifier, wherein the first power amplifier is connected to the main speaker unit, and the second power amplifier is connected to the secondary speaker unit. The audio output device further includes a driving module, wherein the driving module is used to:

[0130] Inputting the original signal into the first power amplifier, so that the first power amplifier amplifies the original signal and then drives it to the main speaker unit for output;

[0131] The original signal is input into the second power amplifier, so that the target signal is amplified by the second power amplifier and then driven to the sub-speaker unit for output.

[0132] In one embodiment, the preset frequency range is a frequency range between a front cavity resonance frequency of the sub-speaker unit and a rear cavity resonance frequency of the sub-speaker unit.

[0133] In one embodiment, the resonant frequency of the rear cavity of the sub-speaker unit is less than 2K Hz, and the resonant frequency of the front cavity of the sub-speaker unit is greater than the resonant frequency of the rear cavity of the sub-speaker unit.

[0134] In addition, an embodiment of the present application further proposes an audio device, which includes: a main speaker unit, a secondary speaker unit and a processor, and the processor is used to implement the steps of the audio output method as described above when executed.

[0135] It should be noted that the processor may specifically be a single chip microcomputer, an FPGA, or various embedded computing units, etc., and this embodiment does not impose any specific limitation on this.

[0136] In addition, if Figure 7As shown, the audio device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the audio device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the audio device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows an audio device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0137] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0138] The audio device provided in the embodiment of the present application adopts the audio output method in the above embodiment, which can solve the technical problem of how to improve the privacy of open-type headphones when using them. Compared with the prior art, the beneficial effects of the audio device provided in the present application are the same as the beneficial effects of the audio output method provided in the above embodiment, and the other technical features in the audio device are the same as the features disclosed in the method of the previous embodiment, which will not be described in detail here.

[0139] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0141] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a readable storage medium having computer-readable program instructions (ie, computer program) stored thereon, and the computer-readable program instructions are used to execute the audio output method in the above-mentioned embodiment.

[0142] The computer-readable storage medium provided in the embodiment of the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0143] The computer-readable storage medium may be included in the audio device; or may exist independently without being installed in the audio device.

[0144] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the audio device, the audio device: obtains the original signal to be output, and obtains the target signal based on the original signal; outputs the original signal through the main speaker unit, and outputs the target signal through the secondary speaker unit; wherein, if the secondary speaker unit is connected forwardly, the original signal and the target signal have opposite phases and the same signal amplitudes within a preset frequency range; if the secondary speaker unit is connected reversely, the original signal and the target signal have the same phases and the same signal amplitudes within the preset frequency range.

[0145] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0146] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0147] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0148] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned audio output method, and can solve the technical problem of how to improve the privacy of open-type headphones when using open-type headphones. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the audio output method provided by the above-mentioned embodiment, and will not be repeated here.

[0149] In addition, an embodiment of the present application also proposes a computer program product, including an audio output program, which implements the steps of the audio output method described above when executed by a processor.

[0150] The specific implementation of the computer program product of the present application is basically the same as the above-mentioned embodiments of the audio output method, and will not be repeated here.

[0151] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0152] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0153] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software sensor, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0154] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An audio output method, characterized in that: The audio output method is applied to an audio device, the audio device includes a main speaker unit and a secondary speaker unit, and the audio output method includes the following steps: Acquire an original signal to be output, and obtain a target signal based on the original signal; Output the original signal through the main speaker unit, and output the target signal through the secondary speaker unit; Wherein, if the secondary speaker unit is connected in a positive direction, the original signal and the target signal have opposite phases and the same signal amplitudes within a preset frequency range; If the secondary speaker unit is connected in reverse, the original signal and the target signal have the same phase and the same signal amplitude within a preset frequency range.

2. The audio output method according to claim 1, characterized in that: The sub-speaker unit is reversely connected, and the step of obtaining the target signal based on the original signal comprises: Filtering the original signal to obtain a first filtered signal and a second filtered signal, wherein the first filtered signal is a signal whose signal frequency belongs to the preset frequency range, and the second filtered signal is a signal whose signal frequency does not belong to the preset frequency range; Obtaining a first signal based on the first filtered signal, wherein the first signal has the same phase and the same signal amplitude as the first filtered signal; obtaining a second signal based on the second filtered signal, wherein the second signal has an opposite phase to the second filtered signal; The first signal and the second signal are combined to obtain a target signal.

3. The audio output method according to claim 2, characterized in that: The audio device further includes an inverter and an equalizer connected in sequence, and the step of obtaining a second signal based on the second filtered signal includes: Inputting the second filtered signal to the inverter to output an inverted signal; The inverted signal is input to the equalizer, and a second signal is output.

4. The audio output method according to claim 2, characterized in that: The audio device further includes a low-pass filter, a high-pass filter and a band-pass filter, the cut-off frequency of the low-pass filter is the lower limit of the preset frequency range, the cut-off frequency of the high-pass filter is the upper limit of the preset frequency range, the passband frequency range of the band-pass filter is the preset frequency range, and the step of filtering the original signal to obtain the first filtered signal and the second filtered signal includes: Input the original signal to the low-pass filter, and output a low-frequency signal; Input the original signal to the high-pass filter, and output a high-frequency signal; Input the original signal to the bandpass filter, and output a medium-high frequency signal; The medium and high frequency signals are determined as first filtered signals, and the low frequency signals and the high frequency signals are determined as second filtered signals.

5. The audio output method according to claim 1, wherein: The audio device further includes a first power amplifier and a second power amplifier, the first power amplifier is connected to the main speaker unit, the second power amplifier is connected to the secondary speaker unit, and before the step of outputting the original signal through the main speaker unit and outputting the target signal through the secondary speaker unit, the method further includes: Inputting the original signal into the first power amplifier, so that the first power amplifier amplifies the original signal and then drives it to the main speaker unit for output; The original signal is input into the second power amplifier, so that the target signal is amplified by the second power amplifier and then driven to the sub-speaker unit for output.

6. The audio output method according to any one of claims 1 to 5, characterized in that: The preset frequency range is a frequency range between a front cavity resonance frequency of the sub-speaker unit and a rear cavity resonance frequency of the sub-speaker unit.

7. The audio output method according to claim 6, wherein: The resonant frequency of the rear cavity of the sub-speaker unit is less than 2K Hz, and the resonant frequency of the front cavity of the sub-speaker unit is greater than the resonant frequency of the rear cavity of the sub-speaker unit.

8. An audio device, characterized in that: The audio device comprises a main speaker unit, a secondary speaker unit and a processor, wherein the main speaker unit and the secondary speaker unit are respectively connected to the processor, and the processor is used to execute the steps of the audio output method as described in any one of claims 1 to 7.

9. A readable storage medium, characterized in that: The readable storage medium is a computer-readable storage medium, and a computer program is stored on the readable storage medium. When the computer program is executed by a processor, the steps of the audio output method according to any one of claims 1 to 7 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the audio output method according to any one of claims 1 to 7 are implemented.

Images