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

Abstract

The present application relates to the technical field of signal processing. Disclosed in the present application are an audio output method, a device, a readable storage medium and a computer program product, which are applied to an audio device, wherein the audio device comprises a primary speaker unit and a secondary speaker unit. The method comprises: acquiring an original signal to be outputted, and obtaining a target signal on the basis of the original signal; and outputting the original signal by means of a primary speaker unit, and outputting a target signal by means of a secondary speaker unit, wherein if the secondary speaker unit is in positive connection, the original signal and the target signal have opposite phases and identical signal amplitudes within a preset frequency range, and if the secondary speaker unit is in negative connection, the original signal and the target signal have identical phases and identical signal amplitudes within the preset frequency range. The present application improves the privacy of open-ear wearable speakers.

Description

Audio output methods, devices, readable storage media, and computer program products Technical Field

[0001] This 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 Technology

[0002] Open-ear wearable speakers (OWS) are popular audio devices because they are comfortable to wear and do not feel blocked. However, due to the open design of open-ear headphones, the sound played inside the wearer's ear canal is also conducted through the air into the free space around the wearer during the sound transmission process. Therefore, there is a common problem of sound leakage, which in turn compromises user privacy and results in poor privacy.

[0003] Therefore, improving the privacy of open-back headphones is a technical problem that urgently needs to be solved in this field. Summary of the Invention

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

[0005] To achieve the above objectives, this application provides an audio output method applied to an audio device, the audio device including a main speaker unit and a secondary speaker unit, the audio output method comprising the following steps:

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

[0007] The original signal is output through the main speaker unit, and the target signal is output through the secondary speaker unit.

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

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

[0010] In one embodiment, the secondary speaker unit is reverse-connected, and the step of obtaining the target signal based on the original signal includes:

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

[0012] A first signal is obtained based on the first filtered signal, wherein the first signal and the first filtered signal have the same phase and the same amplitude;

[0013] A second signal is obtained based on the second filtered signal, wherein the second signal is out of phase with the second filtered signal;

[0014] The target signal is obtained by combining the first signal and the second 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] The second filtered signal is input to the inverter, and an inverted signal is output.

[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 cutoff frequency of the low-pass filter is the lower limit of the preset frequency range, the cutoff frequency of the high-pass filter is the upper limit of the preset frequency range, and the passband frequency range of the band-pass filter is the preset frequency range. The step of filtering the original signal to obtain a first filtered signal and a second filtered signal includes:

[0019] The original signal is input to the low-pass filter, and a low-frequency signal is output.

[0020] The original signal is input into the high-pass filter, and a high-frequency signal is output.

[0021] The original signal is input into the bandpass filter, and a mid-to-high frequency signal is output.

[0022] The mid-to-high frequency signal is determined as the first filtered signal, and the low-frequency signal and the high-frequency signal are determined as the second filtered signal.

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

[0024] The original signal is input to the first power amplifier, so that the original signal is amplified by the first power amplifier and driven 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 driven to the secondary speaker unit for output.

[0026] In one embodiment, the preset frequency range is the frequency range between the front cavity resonant frequency of the secondary speaker unit and the rear cavity resonant frequency of the secondary speaker unit.

[0027] In one embodiment, the rear cavity resonant frequency of the secondary speaker unit is less than 2 kHz, and the front cavity resonant frequency of the secondary speaker unit is greater than the rear cavity resonant frequency of the secondary speaker unit.

[0028] In addition, to achieve the above objectives, this 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 described above.

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

[0030] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the audio output method described above.

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

[0032] An audio device incorporates a main speaker unit and a secondary speaker unit. The main speaker unit outputs the original signal. When the secondary speaker unit is connected in the forward direction, it outputs a target signal within a preset frequency range that is out of phase with the original signal but has the same amplitude. When the secondary speaker unit is connected in the reverse direction, it outputs a target signal that is in phase with the original signal but has the same amplitude. It is understood that when the speaker is connected in the reverse direction, its output signal will also be out of phase. That is, within the preset frequency range, the secondary speaker unit generates a target signal with an out-of-phase and different amplitude than the main speaker unit. This causes the audio signals generated by the main and secondary speaker units to interfere and cancel each other out within the preset frequency range, preventing users of other audio devices from hearing audio signals within the preset frequency range. This enhances the privacy of the audio device. As an audio device, open-back headphones can also benefit from the improved privacy when the proposed technology is applied. Attached Figure Description

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

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

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

[0041] Figure 7 is a schematic diagram of the hardware operating environment involved in the audio output device in the embodiments of this application.

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

[0043] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] With the development of virtual reality and open-back wireless headphones (OWS), near-ear open-back audio devices are increasingly favored by users due to their comfortable wearing experience. However, due to the degree of distance from the ear canal (compared to in-ear and semi-open headphones) and compromises in wearing comfort, these products also have relatively unfavorable acoustic conditions. They face two major acoustic problems: First, insufficient low frequencies. Due to the open-back nature, the radiation conditions change from a pressure field to a near-free field, causing the sound radiation characteristics to tend towards a second-order high-pass mode. Leakage leads to a rapid decay in low-frequency response; for current near-ear open-back audio devices, the frequency response below 400Hz begins to decay. Second, privacy issues caused by sound leakage. Due to the distance from the ear canal, to achieve sufficient loudness, these devices require speakers to produce a larger amplitude than headphones to meet the wearer's loudness needs. This also leads to a significant amount of sound leakage into the far field, allowing people nearby to hear the playback content, causing sound leakage and reducing privacy.

[0045] To address this issue, a dipole acoustic design approach can be employed: actively opening the rear cavity of the speaker introduces an acoustic short circuit, localizing the sound waves near the near field to enhance privacy. Simultaneously, opening the rear cavity reduces speaker stiffness and significantly improves low-frequency amplitude. However, this design method also has significant drawbacks: Firstly, regarding low-frequency acoustic short circuits, opening the rear cavity introduces interference between front and rear acoustic radiation in the near field, leading to acoustic cancellation in the out-of-phase frequency band and causing a reduction in mid-low frequencies. Secondly, the privacy bandwidth is relatively narrow. Due to the numerous series and parallel resonance characteristics of the acoustic system constructed by the speaker diaphragm and the front and rear cavities, a mismatch in the amplitude and phase of the acoustic radiation from the front and rear cavities begins to appear at certain mid-high frequency points, no longer meeting the acoustic conditions of a dipole, leading to acoustic short-circuit failure, and even enhanced acoustic radiation, causing the product's acoustic privacy design to fail and resulting in sound leakage.

[0046] Based on this, the main solution of this application is: an audio device is configured with a main speaker unit and a secondary speaker unit to acquire the original signal to be output, and to obtain a target signal 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 in the forward direction, the original signal and the target signal are out of phase and have the same amplitude within a preset frequency range; if the secondary speaker unit is connected in the reverse direction, the original signal and the target signal are in phase and have the same amplitude within a preset frequency range.

[0047] This application incorporates a main speaker unit and a secondary speaker unit within an audio device. The main speaker unit outputs the original signal, while the secondary speaker unit, when connected in the forward direction, outputs a target signal within a preset frequency range that is out of phase with the original signal but has the same amplitude. When connected in the reverse direction, the secondary speaker unit outputs the target signal that is in phase with the original signal but has the same amplitude. It is understood that when the speaker is connected in the reverse direction, its output signal will also be out of phase. That is, within the preset frequency range, the secondary speaker unit generates a target signal with an out-of-phase and amplitude compared to the main speaker unit. This causes the audio signals generated by the main and secondary speaker units to interfere and cancel each other out within the preset frequency range, preventing users of other audio devices from hearing the audio signals within the preset frequency range. This enhances the privacy of the audio device. As an audio device, open-back headphones can also benefit from the improved privacy when the proposed technology is applied.

[0048] It should be noted that the implementing entity of the audio output method embodiments of this application can be an audio device capable of performing the above-mentioned functions, such as an OWS headset. Exemplarily, the embodiments of the audio output method of this application will be described and explained using an OWS headset as an example.

[0049] Based on this, this application proposes an audio output method according to a first embodiment. The audio device includes a secondary speaker unit and a main speaker unit. Referring to Figure 1, the audio output method includes steps S10 to S20:

[0050] Step S10: Obtain the original signal to be output, and obtain the target signal based on the original signal;

[0051] Wherein, if the secondary speaker unit is connected in the positive direction, the original signal and the target signal are out of phase and have the same amplitude within the preset frequency range; if the secondary speaker unit is connected in the negative direction, the original signal and the target signal are in phase and have the same amplitude within the preset frequency range.

[0052] The main speaker unit is the primary output unit in an OWS headset, responsible for producing the main audio content. It typically has high power handling capabilities and good sound quality to ensure clarity and dynamic range. Secondary speaker units supplement the audio experience and are responsible for active control of sound leakage.

[0053] Referring to FIG2, both the main speaker unit and the secondary speaker unit may specifically be sound-emitting units including at least one speaker 10.

[0054] Furthermore, referring to Figure 2, both the main speaker unit and the secondary speaker unit include a front cavity 20 and a rear cavity 30. 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 enclosed or partially enclosed enclosures.

[0055] Furthermore, referring to Figure 2, both the front cavity 20 and the rear cavity 30 are partially enclosed enclosures. 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, both the main speaker unit and the speaker unit have open front and rear cavities.

[0056] Furthermore, referring to Figure 2, the volume of the secondary speaker unit is smaller than that of the primary speaker unit.

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

[0058] The secondary speaker unit can be connected in either the positive or negative direction. A positive connection means the positive terminal of the speaker in the secondary 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. A negative connection means the positive terminal of the speaker in the secondary 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. The embodiments of this application are illustrated with an example of a secondary speaker unit connected in the negative direction.

[0059] When the secondary speaker unit is reverse-connected, the target signal has the same phase and amplitude as the original signal within a preset frequency range. It should be noted that the preset frequency range can be a frequency range set in advance by relevant personnel for desired privacy control; in layman's terms, the audio device is expected not to leak sound into the external environment within the preset frequency range. For example, the preset frequency range can specifically be the entire frequency band, greater than 400 Hz, less than 5 kHz, greater than or equal to 400 Hz and less than or equal to 5 kHz, etc. This embodiment does not impose specific limitations on this. In a specific embodiment, considering that the human ear is most sensitive to sound leakage from headphones in the mid-frequency range, especially the 1 kHz to 3 kHz band, the preset frequency range can be 1 kHz to 3 kHz.

[0060] Outside of the preset frequency range, the target signal and the original signal can have the same or opposite phase, or other relationships. The amplitude of the target signal can also be any value, and this embodiment does not impose specific restrictions on this. In layman's terms, outside of the preset frequency range, the target signal can be any signal (including no signal, i.e., an empty signal).

[0061] To obtain the target signal, the original signal can be filtered to select signals within a preset frequency range, and then the target signal can be obtained based on the selected signals. For example, assuming the preset frequency range is less than or equal to 3 kHz, referring to Figure 3, a low-pass filter with a cutoff frequency of 3 kHz can be set. The original signal (the input signal shown in Figure 3) is copied and input to the low-pass filter to select signals less than or equal to 3 kHz. Phase and amplitude control is then applied to the selected signals to generate a target signal with the same phase and amplitude as the original signal. The target signal is then driven to the secondary speaker unit (the secondary unit shown in Figure 3) after passing through a DAC (Digital-to-Analog Converter) and a power amplifier, while the original signal is driven to the main speaker unit (the main unit shown in Figure 3) after passing through a DAC and a power amplifier. It is understood that at this point, the target signal outside the preset frequency range is an empty signal.

[0062] Furthermore, the frequency range where the frequency response of the main speaker unit is less than a preset value is defined as the attenuation frequency range. Considering that the frequency response of speakers is typically low within the attenuation frequency range, resulting in poor audio performance of OWS headphones within this range, and making it difficult for the wearer to hear sounds within this range, thus affecting the wearer's listening experience. For example, the frequency response of speakers typically begins to attenuate below 400 Hz, making it difficult for the wearer to hear low-frequency sounds. Therefore, in a preferred embodiment, the preset frequency range may include only a portion or not include the attenuation frequency range; that is, the attenuation frequency range may be partially or entirely outside the preset frequency range. Furthermore, outside the preset frequency range, the target signal and the original signal are in phase. Thus, outside the preset frequency range, the secondary speaker unit and the main speaker unit can work together to enhance the audio performance of the main speaker unit within the attenuation frequency range, while simultaneously providing privacy control over the audio within the preset frequency range where the frequency response is better. This balances the privacy of the OWS headphones with their full-frequency audio performance, thereby improving the wearer's listening experience.

[0063] Furthermore, the preset values ​​mentioned above can be values ​​set in advance by relevant personnel based on experience or experimental summaries. When the frequency response is lower than this value, users will usually not be able to hear the sound or will feel that some characteristics of the sound are missing.

[0064] Step S20: The original signal is output through the main speaker unit, and the target signal is output through the secondary speaker unit;

[0065] After obtaining the target signal, the target signal is driven to the secondary speaker unit, and the original signal is driven to 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 amplitude within the preset frequency range, and thus achieving noise cancellation through far-field interference of sound waves, 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 their corresponding signals, the sound is not completely eliminated in the near field of sound waves, thus allowing the wearer of the OWS headphones to hear sounds within the preset frequency range.

[0067] This embodiment incorporates a main speaker unit and a secondary speaker unit within the OWS headset. The main speaker unit outputs the original signal. When the secondary speaker unit is connected in the forward direction, it outputs a target signal within a preset frequency range that is out of phase with the original signal but has the same amplitude. When the secondary speaker unit is connected in the reverse direction, it outputs a target signal that is in phase with the original signal but has the same amplitude. It can be understood that when the speaker is connected in the reverse direction, its output signal will also be out of phase. In other words, within the preset frequency range, the secondary speaker unit generates a target signal with an out-of-phase and amplitude compared to the main speaker unit. This causes the audio signals generated by the main speaker unit and the secondary speaker unit to interfere and cancel each other out within the preset frequency range. This prevents other users of the OWS headset from hearing the audio signal generated by the OWS headset within the preset frequency range, thereby enhancing the privacy of the user when using the OWS headset.

[0068] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description and will not be repeated hereafter. Based on this, the secondary speaker unit is reversed, and the step of obtaining the target signal based on the original signal includes:

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

[0070] It should be noted that the original signal can be filtered using one or more filters to obtain a first filtered signal and a 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 relevant personnel can set one or more filters based on a preset frequency range to obtain the first filtered signal and the second filtered signal; this embodiment does not impose specific limitations in this regard.

[0071] For example, referring to FIG4, assuming 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 less than or equal to 400 Hz can be set to filter the original signal to obtain a second filtered signal.

[0072] Step A20: Obtain a first signal based on the first filtered signal, wherein the first signal and the first filtered signal have the same phase and the same amplitude;

[0073] Step A30: Obtain a second signal based on the second filtered signal, wherein the second signal is out of phase with the second filtered signal;

[0074] Referring to Figure 4, specifically, a second signal opposite to the second filtered signal can be obtained by using an inverter.

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

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

[0077] The target signal is obtained by combining the first signal and the second signal. Specifically, referring to Figure 4, the target signal can be obtained by adding the first signal and the second signal together.

[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 outside the preset frequency range. A first signal with the same phase and amplitude as the first filtered signal is obtained, and a second signal with the opposite phase to the second filtered signal is obtained. The first and second signals are combined to obtain the target signal. Thus, within the preset frequency range, the target signal and the original signal have the same amplitude and phase, achieving privacy control within the preset frequency range; while outside the preset frequency range, the target signal and the original signal have opposite phase, achieving audio enhancement in that frequency band, thereby balancing the privacy and audio performance of the OWS headphones.

[0079] In one possible implementation, 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: Input the second filtered signal to the inverter and output an inverted signal;

[0081] Step B20: Input the inverted signal to the equalizer and output the second signal.

[0082] It should be noted that relevant personnel can adjust the equalizer parameters according to the actual audio effect required to obtain the desired second signal; this example does not impose specific restrictions on this.

[0083] In one possible implementation, referring to FIG5, the audio device further includes a low-pass filter, a high-pass filter, and a band-pass filter. The cutoff frequency of the low-pass filter is the lower limit of the preset frequency range, the cutoff frequency of the high-pass filter is the upper limit of the preset frequency range, and the passband frequency range of the band-pass filter is the preset frequency range. The step of filtering the original signal to obtain a first filtered signal and a second filtered signal includes:

[0084] Step C10: Input the original signal into the low-pass filter and output a low-frequency signal;

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

[0086] Let the lower limit of the preset frequency range be fc1 and the upper limit be fc2. Then, the cutoff frequency of the low-pass filter can be set to fc1, the cutoff frequency of the high-pass filter to fc2, the low-frequency cutoff frequency of the band-pass filter to fc1, and the high-frequency cutoff frequency of the band-pass filter 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], which can determine that the lower limit of the preset frequency range is fc1 and the upper limit is fc2.

[0088] Step C20: Input the original signal into the high-pass filter and output a high-frequency signal;

[0089] Step C30: Input the original signal into the bandpass filter and output a mid-to-high frequency signal;

[0090] Step C40: Determine the mid-to-high frequency signal as the first filtered signal, and determine the low-frequency signal and the high-frequency signal as the second filtered signals.

[0091] The low-frequency and high-frequency signals are identified as the second filtering signals so that the OWS headphones can be enhanced in low and high frequencies after subsequent processing.

[0092] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to the first and second embodiments described above can be referred to the above description and will not be repeated hereafter. In addition, the audio device further includes a first power amplifier and a second power amplifier, the first power amplifier being connected to the main speaker unit and the second power amplifier being connected to the secondary speaker unit. Before the step of outputting the original signal through the main speaker unit and the target signal through the secondary speaker unit, the method further includes:

[0093] Step D10: Input the original signal to the first power amplifier so that the original signal is amplified by the first power amplifier and driven 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 driven to the secondary speaker unit for output.

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

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

[0097] In one possible implementation, the preset frequency range is the frequency range between the front cavity resonant frequency of the secondary speaker unit and the rear cavity resonant frequency of the secondary speaker unit.

[0098] The preset frequency range is set to the frequency range between the front cavity resonant frequency and the rear cavity resonant frequency of the secondary speaker unit. In this way, the preset frequency range is consistent with the frequency range between the front cavity resonant frequency and the rear cavity resonant frequency of the secondary speaker unit. By adjusting the front cavity and rear cavity resonant frequencies of the speaker to coincide with the frequency range where sound is prone to leakage, the attenuation of sound waves at these frequencies can be effectively enhanced, thereby reducing the risk of sound leakage.

[0099] In one possible implementation, the rear cavity resonant frequency of the secondary loudspeaker unit is less than 2 kHz, and the front cavity resonant frequency of the secondary loudspeaker unit is greater than the rear cavity resonant frequency of the secondary loudspeaker unit.

[0100] In this embodiment, the front cavity resonant frequency of the secondary speaker unit is greater than the rear cavity resonant frequency. The rear cavity resonant frequency mainly affects the low-frequency part of the speaker. A lower rear cavity resonant frequency means that the speaker can resonate at a lower frequency, thereby improving the low-frequency response and fullness of the sound of the secondary speaker unit. The front cavity resonant frequency mainly affects the high-frequency part. A higher front cavity resonant frequency can make the high-frequency sound clearer and brighter. At the same time, a front cavity resonant frequency greater than the rear cavity resonant frequency can avoid the sound from having a deep trough in the mid-frequency range, resulting in a low volume, thereby reducing the distortion caused by resonance.

[0101] For example, in order to help understand the technical concept or technical principle of the audio output method after combining this embodiment with the first embodiment and the second embodiment, a specific embodiment is listed here. In this specific embodiment, the audio output method is applied to an OWS headset. The OWS headset includes a main unit (i.e., the main speaker unit), a secondary unit (i.e., the 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] The main unit is a speaker unit primarily used for radiating sound waves. This unit is relatively large and mainly functions to radiate sound waves towards the ear, constructing the main audio components and experience. The secondary unit supplements the audio experience and is responsible for active sound leakage control. Its acoustic structure requires meticulous design, involving two key parameters: fc1 and fc2. fc1 represents the parallel resonant frequency of its rear cavity, and fc2 represents the parallel resonant frequency of its front cavity. The main and secondary unit cavities are independent and do not share a cavity. The main unit diaphragm divides the main unit into a front cavity and a rear cavity; the secondary unit diaphragm divides the secondary unit into a front cavity and a rear cavity. The rear cavity is defined as the part containing the speaker unit's magnetic circuit system, and the front cavity is defined as the part not containing the magnetic circuit system. The parallel resonant frequency fc1 of the secondary unit's rear cavity is less than 2kHz, and the parallel resonant frequency fc2 of the secondary unit's front cavity is greater than fc1. The frequency band from fc1 to fc2 is the operating frequency band for the secondary unit's active privacy control.

[0103] The power amplifier is used to amplify the signal to drive the speaker unit; the digital-to-analog converter is used to convert digital signals to analog signals; the digital signal processing unit is a computer unit used to implement active control algorithms, which may be a microcontroller, 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 in conjunction 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, while the signal amplitude is the same. Since the frequency band is higher than fc1, the sound wave from the rear outlet of the secondary unit is inverted. At this time, the secondary unit system is similar to a bass reflex box loudspeaker, forming an in-phase secondary sub-unit. At this time, the far-field radiation capability of the secondary unit system is the strongest, which can be used to cancel 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 settings. This frequency band utilizes the high-frequency response of the secondary unit, working in conjunction with the primary unit system to enhance the high-frequency performance of the audio. Since the secondary unit is typically small, its high-frequency performance is far superior to that of the primary unit; in this case, the system resembles a high-low crossover audio system.

[0107] Based on this, referring to Figure 5, the audio output process is as follows:

[0108] The input signal (i.e., the original signal) is sequentially copied into three paths and input to a low-pass filter, a band-pass filter, and a high-pass filter respectively. One signal passes through a low-pass filter, an inverter, and an equalizer in sequence; another signal passes through a band-pass filter and phase and amplitude control in sequence; and the third signal passes through a high-pass filter, an inverter, and an equalizer in sequence. The three signals are then combined, added together, and input to a DAC. After passing through the DAC and a power amplifier in sequence, the signal is output through the secondary unit. Simultaneously, the input signal passes through the DAC and a power amplifier in sequence and is output through the main unit.

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

[0110] It should be noted that the above examples are only for the purpose of assisting in understanding this application and do not constitute a limitation on the audio device structure and audio output method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0111] Furthermore, this application also proposes an audio output device, which includes an audio device comprising a main speaker unit and a secondary speaker unit. Referring to FIG6, the audio output device further includes:

[0112] Acquisition module 10 is used to acquire the original signal to be output and obtain the target signal based on the original signal;

[0113] Output module 20 is used to output the original signal through the main speaker unit and the target signal through the secondary speaker unit;

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

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

[0116] In one embodiment, the acquisition module 10 is further configured to:

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

[0118] A first signal is obtained based on the first filtered signal, wherein the first signal and the first filtered signal have the same phase and the same amplitude;

[0119] A second signal is obtained based on the second filtered signal, wherein the second signal is out of phase with the second filtered signal;

[0120] The target signal is obtained by combining the first signal and the second 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 configured to:

[0122] The second filtered signal is input to the inverter, and an inverted signal is output.

[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 cutoff frequency of the low-pass filter is the lower limit of the preset frequency range, the cutoff frequency of the high-pass filter is the upper limit of the preset frequency range, and the passband frequency range of the band-pass filter is the preset frequency range. The acquisition module 10 is further configured to:

[0125] The original signal is input to the low-pass filter, and a low-frequency signal is output.

[0126] The original signal is input into the high-pass filter, and a high-frequency signal is output.

[0127] The original signal is input into the bandpass filter, and a mid-to-high frequency signal is output.

[0128] The mid-to-high frequency signal is determined as the first filtered signal, and the low-frequency signal and the high-frequency signal are determined as the second filtered signal.

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

[0130] The original signal is input to the first power amplifier, so that the original signal is amplified by the first power amplifier and driven 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 driven to the secondary speaker unit for output.

[0132] In one embodiment, the preset frequency range is the frequency range between the front cavity resonant frequency of the secondary speaker unit and the rear cavity resonant frequency of the secondary speaker unit.

[0133] In one embodiment, the rear cavity resonant frequency of the secondary speaker unit is less than 2 kHz, and the front cavity resonant frequency of the secondary speaker unit is greater than the rear cavity resonant frequency of the secondary speaker unit.

[0134] Furthermore, this application also proposes an audio device, which includes a main speaker unit, a secondary speaker unit, and a processor, wherein the processor executes steps for implementing the audio output method described above.

[0135] It should be noted that the processor can be a microcontroller, FPGA, or various embedded computing units, etc., and this embodiment does not impose any specific restrictions on it.

[0136] Furthermore, as shown in FIG7, the audio device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the audio device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows audio devices to communicate wirelessly or wiredly with other devices to exchange data. While audio devices with various systems are shown in the figures, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0137] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0138] The audio device provided in this application, employing the audio output method described in the above embodiments, can solve the technical problem of improving the privacy of open-back headphones. Compared with the prior art, the beneficial effects of the audio device provided in this application are the same as those of the audio output method provided in the above embodiments, and other technical features of this audio device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0139] It should be understood that the various parts disclosed in this application can be implemented using 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 suitable manner in one or more embodiments or examples.

[0140] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0141] In addition, to achieve the above objectives, embodiments of this application also provide a readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the audio output method in the above embodiments.

[0142] The computer-readable storage medium provided in this application embodiment may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. 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 conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0143] The aforementioned computer-readable storage medium may be included in an audio device or may exist independently without being assembled into an audio device.

[0144] The aforementioned computer-readable storage medium carries one or more programs that, when executed by an audio device, cause the audio device to: acquire a raw signal to be output; obtain a target signal based on the raw signal; output the raw signal through a main speaker unit; and output the target signal through a secondary speaker unit; wherein, if the secondary speaker unit is connected in the forward direction, the raw signal and the target signal are out of phase and have the same amplitude within a preset frequency range; if the secondary speaker unit is connected in the reverse direction, the raw signal and the target signal are in phase and have the same amplitude within the preset frequency range.

[0145] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0146] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0147] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0148] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described audio output method. This solves the technical problem of improving the privacy of open-back headphones when using them. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the audio output method provided in the above embodiments, and will not be repeated here.

[0149] Furthermore, embodiments of this application also propose a computer program product, including an audio output program, which, when executed by a processor, implements the steps of the audio output method described above.

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

[0151] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0152] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0153] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software sensor. This computer software sensor is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0154] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An audio output method, characterized in that, The audio output method is applied to an audio device, the audio device including a main speaker unit and a secondary speaker unit, and the audio output method includes the following steps: Obtain the original signal to be output, and obtain the target signal 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 loudspeaker unit is connected in the positive direction, then within a preset frequency range, the original signal and the target signal have opposite phases and the same amplitude; If the secondary speaker unit is reversed, the original signal and the target signal will have the same phase and amplitude within a preset frequency range.

2. The audio output method as described in claim 1, characterized in that, The secondary speaker unit is reversed, and the step of obtaining the target signal based on the original signal includes: The original signal is filtered to obtain a first filtered signal and a second filtered signal, wherein the first filtered signal is a signal whose frequency belongs to the preset frequency range, and the second filtered signal is a signal whose frequency does not belong to the preset frequency range; A first signal is obtained based on the first filtered signal, wherein the first signal and the first filtered signal have the same phase and the same amplitude; A second signal is obtained based on the second filtered signal, wherein the second signal is out of phase with the second filtered signal; The target signal is obtained by combining the first signal and the second signal.

3. The audio output method as described in claim 2, characterized in that, 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: The second filtered signal is input to the inverter, and an inverted signal is output. The inverted signal is input to the equalizer, and a second signal is output.

4. The audio output method as described in claim 2, characterized in that, The audio device further includes a low-pass filter, a high-pass filter, and a band-pass filter. The cutoff frequency of the low-pass filter is the lower limit of the preset frequency range, the cutoff frequency of the high-pass filter is the upper limit of the preset frequency range, and the passband frequency range of the band-pass filter is the preset frequency range. The step of filtering the original signal to obtain a first filtered signal and a second filtered signal includes: The original signal is input to the low-pass filter, and a low-frequency signal is output. The original signal is input into the high-pass filter, and a high-frequency signal is output. The original signal is input into the bandpass filter, and a mid-to-high frequency signal is output. The mid-to-high frequency signal is determined as the first filtered signal, and the low-frequency signal and the high-frequency signal are determined as the second filtered signal.

5. The audio output method as described in claim 1, characterized in that, The audio device further includes a first power amplifier and a second power amplifier, the first power amplifier being connected to the main speaker unit and the second power amplifier being connected to the secondary speaker unit. Before the step of outputting the original signal through the main speaker unit and the target signal through the secondary speaker unit, the method further includes: The original signal is input to the first power amplifier, so that the original signal is amplified by the first power amplifier and driven 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 driven to the secondary 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 the frequency range between the front cavity resonant frequency of the secondary speaker unit and the rear cavity resonant frequency of the secondary speaker unit.

7. The audio output method as described in claim 6, characterized in that, The resonant frequency of the rear cavity of the secondary loudspeaker unit is less than 2 kHz, and the resonant frequency of the front cavity of the secondary loudspeaker unit is greater than the resonant frequency of the rear cavity of the secondary loudspeaker unit.

8. An audio device, characterized in that, The audio device 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 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, on which a computer program is stored, and when executed by a processor, the computer program implements the steps of the audio output method as described in any one of claims 1 to 7.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the audio output method as described in any one of claims 1 to 7.

Images