A DSP chip regulated adaptive volume control earphone amplifier

Abstract

The application relates to a DSP chip adjusted adaptive volume control earphone amplifier, which is provided with a current copying circuit and a monitoring module, one of which is used for collecting real-time played audio data, and the other is used for collecting a use environment and a use state; on one hand, the state of the environment does not have to be collected too frequently, and the effect of saving power, saving resources and reducing cost is achieved; on the other hand, the amplification multiple can be calculated according to the played audio in real time, the volume difference between different audio files can be balanced, and the volume needs not to be frequently adjusted. A pressure sensor is arranged at the position where the earphone contacts the human ear, a DSP chip calculates a gain adjustment coefficient G according to a pressure value F, so that when the pressure received by the earphone is reduced, the earphone can automatically increase the volume, the problem that the actual listening volume is different due to different pressures is solved, a sleep mode is arranged, the volume can be automatically adjusted according to whether the user has feedback, and the sleep of the user is avoided.

Description

Technical Field

[0001] This invention relates to the field of headphone amplifier technology, and more particularly to an adaptive volume control headphone amplifier regulated by a DSP chip. Background Technology

[0002] More and more people are using headphones to listen to music and watch videos. Since headphones come into direct contact with the ear canal, excessive volume can cause hearing damage, and in severe cases, even deafness. At the same time, wearing headphones for a long time can cause ear fatigue and severe pressure on the area around the ear, reducing blood circulation and causing pain around the ear. However, if the pressure on the headphones is reduced, the volume can be reduced too much.

[0003] CN101222210A discloses a device and method for adaptive volume adjustment in a mobile phone, including a baseband processor, a volume adjustment trigger, a sound sensor, and a sound detection unit. This device adaptively adjusts the phone's volume according to ambient volume, meeting the user's volume adjustment requirements in different environments. CN105592195B discloses a volume adaptive adjustment method and device, which can adaptively adjust the user's mobile terminal volume based on different background volume levels, avoiding the inconvenience of manual volume adjustment.

[0004] However, the aforementioned devices typically adjust volume based on the volume of the playing sound and ambient noise, offering limited functionality and poor adjustment results. Furthermore, audio calculations require substantial computational resources, and real-time analysis necessitates sophisticated equipment, leading to high costs. Therefore, finding a cost-effective way to achieve adaptive volume adjustment is a problem that needs to be solved. Summary of the Invention

[0005] To address the above issues, an adaptive volume control headphone amplifier with DSP chip adjustment is provided, comprising an amplification control module, a DSP chip, a current replication circuit, a monitoring module, and an output module.

[0006] The amplification control module connects the signal source and the output module. The signal source sends audio data to the amplification control module; the amplification control module is used to amplify the audio source signal and output it to the output module.

[0007] The DSP chip is connected to the amplification and control module, the current replication circuit is connected to the amplification and control module and the DSP chip, and the monitoring module is connected to the output module and the DSP chip.

[0008] The current replication circuit samples the signal current from the amplification control module, thereby sending the real-time playback current data of the amplification control module to the DSP chip;

[0009] The monitoring module collects the real-time playback signal from the output module, analyzes it, and sends it to the DSP chip.

[0010] The DSP chip is used to adjust the amplification factor of the amplification control module based on the input data.

[0011] The amplifier is located inside the earphone, and the monitoring module includes a microphone module, a timing module, a monitoring processor, a gravity sensor module, and a model parameter converter.

[0012] The output terminal of the output module is directly connected to the detection processor, enabling the detection processor to collect the output audio data A from the output terminal in real time;

[0013] The microphone module is mounted on the headset and is used to collect noise data B from the environment and send it to the monitoring processor;

[0014] The timing module records the amplifier's usage time and sends the usage time C to the monitoring processor in real time.

[0015] The gravity sensor module monitors the headphone's posture and sends the headphone's posture parameter D to the monitoring processor;

[0016] The monitoring processor connects to the model parameter converter, which converts the collected A, B, C, and D data into model parameters that the DSP can recognize and sends them to the DSP chip.

[0017] The current replication circuit takes the unamplified audio data E obtained from the D / A conversion of the signal source and sends it to the DSP chip after A / D conversion;

[0018] The DSP has a built-in amplification factor calculation model, which is used to calculate the amplification factor of the amplification control module based on the input data in order to adjust the amplification factor of the amplification control module.

[0019] The DSP chip analyzes the audio data E before amplification to obtain the energy M of the audio data E. E Crest Intensity A E ;

[0020] The audio data A collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the audio data A. A Crest Intensity A A ;

[0021] The noise data B collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the noise data B. B Crest Intensity A B ;

[0022] After the usage duration C is sent to the detection processor, it is converted into the usage duration level L, which includes 5-10 levels.

[0023] The processor can obtain the current time T, which is then converted into a time period level N. The time period level N includes two levels, corresponding to daytime and nighttime respectively.

[0024] The posture parameter D includes two states: upright and lying down.

[0025] The audio data E is acquired and processed in real time by the DSP chip, and the energy M of the audio data E is obtained in real time. E Crest Intensity A E The calculation is based on a segment of audio data E within a time period of 5-10 seconds prior to the current moment;

[0026] Audio data A and noise data B are processed by the monitoring processor every 10-60 seconds. That is, a segment of audio data A and noise data B is generated every 10-60 seconds, processed within the monitoring processor, and the energy M of the corresponding audio data A is obtained. A Crest Intensity A A The energy M of the noise data B B Crest Intensity A B ;

[0027] The data processed by the monitoring processor is organized within the model parameter converter, and then formed into a data format that the DSP can recognize; the data format obtained by the DSP chip from the model parameter converter is (M A A A M B A B ,L,N,D);

[0028] The model parameter converter sends a set of data to the DSP chip every 10s-60s.

[0029] This enables the DSP chip to obtain a set of model parameters every 10s-60s for selecting a calculation model. At the same time, the DSP chip uses the selected calculation model to calculate the amplification factor based on the audio data E in real time.

[0030] In the parameter M A A A Corresponding to the speaker's operating state, when M A A A If the threshold is exceeded, it indicates that the current operating gain of the speaker is too high. When M A A A If the gain is below the threshold, it indicates that the speaker's current operating gain is low.

[0031] In the parameter M B A B Corresponding to the ambient noise level, when M BA B If the threshold is exceeded, it indicates that the speaker environment is relatively noisy. When M B A B If the value is below the threshold, it indicates that the environment is relatively quiet;

[0032] The parameters L, N, and D correspond to usage duration, usage time period, and usage posture; the larger L is, the longer the usage time, N corresponds to daytime and nighttime, and D corresponds to whether to use in a lying position.

[0033] The DSP stores X different calculation models, X = K1 × K2 × K3 × K4 × K5; K1 corresponds to the number of speaker gain levels, K2 corresponds to the number of ambient noise levels, K3 corresponds to the number of usage duration levels L, K4 = 2 corresponds to daytime and nighttime, and K5 = 2 corresponds to standing and lying positions.

[0034] X models satisfy the following condition:

[0035] The higher the speaker gain, the lower the amplification factor obtained for the same audio data E in the corresponding model; the lower the speaker gain, the higher the amplification factor obtained for the same audio data E in the corresponding model; the higher the ambient noise, the higher the amplification factor obtained for the same audio data E in the corresponding model; the lower the ambient noise, the lower the amplification factor obtained for the same audio data E in the corresponding model; the longer the usage time, the lower the amplification factor obtained for the same audio data E in the corresponding model; the shorter the usage time, the higher the amplification factor obtained for the same audio data E in the corresponding model; the higher the amplification factor obtained for the same audio data E in the corresponding model when used during the day; the lower the amplification factor obtained for the same audio data E in the corresponding model when used at night; the higher the amplification factor obtained for the same audio data E in the corresponding model when used in a standing position; the lower the amplification factor obtained for the same audio data E in the corresponding model when used in a lying position.

[0036] The model selection includes BP neural network model, partial least squares model, linear model, SVM model, or empirical model.

[0037] Of course, in actual use, the models are not limited to the above types. Any model that meets the aforementioned conditions is acceptable. The specific amplification factor is the energy M of the audio data E. E Crest Intensity A E After inputting the model, the energy M is obtained based on the magnification factor. E Crest Intensity A E The smaller the value, the higher the magnification, and the energy M. E Crest Intensity A E The larger the amplification factor, the smaller the magnification factor, thus balancing the audio data from different sound sources and preventing the volume of certain songs or audio from being too low or too high, requiring frequent manual volume adjustments.

[0038] To address the issue of varying listening volume caused by different pressure levels, a pressure sensor is installed at the point where the headphones contact the ear. The pressure sensor outputs a pressure value F. The DSP chip calculates the gain adjustment coefficient G based on the pressure value F. G is inversely proportional to F, meaning that the smaller F is, the larger G is. This allows the headphones to automatically increase the volume when the pressure on them decreases.

[0039] The gain adjustment coefficient directly increases the amplification factor output by the computational model within the DSP. In other words, it directly adds G to the amplification factor output by the computational model within the DSP to obtain the actual amplification factor input to the amplification control module.

[0040] The interval between songs is usually only a few seconds, hence the energy M E Crest Intensity A E The sampling interval is relatively small, resulting in good real-time adjustment. The user's usage status (e.g., day or night, lying down or sitting) and the device's working status (e.g., gain level or ambient noise level) generally do not change frequently, so there is no need to sample them frequently; the sampling setting can be done on the order of minutes.

[0041] The headphone amplifier also features an automatic sleep mode:

[0042] When the headphone amplifier is used between 20:00 and 6:00, the DSP chip sends a reduction amplification control command to the amplification module every 30 minutes, causing the amplification factor of the amplification control module to decrease and the headphone output volume to decrease. At the same time, the DSP chip waits for the activation signal from the monitoring module. When the DSP chip receives the activation signal, it sends a reduction amplification factor recovery command to the amplification module, causing the amplification factor of the amplification control module to recover and the headphone output volume to recover.

[0043] When the headphone amplifier is used between 20:00 and 6:00, the monitoring module sends an activation signal to the DSP chip when the accelerometer in the monitoring module detects vibration.

[0044] The DSP chip controls the headphone output volume to be reduced to one-third of the original volume. After three reductions, the headphone output volume is 0.

[0045] The beneficial effects of this invention are as follows:

[0046] This invention incorporates a current replication circuit and a monitoring module, one for real-time acquisition of playing audio data and the other for acquisition of the usage environment and status. A DSP chip is used to process the input data in real time. A model is selected based on the device status, environmental status, and user status, while the amplification factor is calculated based on the real-time playing audio data input into the model. This approach avoids the need for excessively frequent environmental status acquisition, saving power and resources and reducing costs. Furthermore, the real-time amplification factor calculation based on the playing audio balances volume differences between different audio files, avoiding the need for frequent volume adjustments.

[0047] The DSP stores multiple different calculation models, corresponding to the number of speaker gain state levels, the number of ambient noise levels, the number of usage duration levels L, daytime and nighttime, and standing and lying postures. With more models, it is more targeted, and the corresponding model can be switched for different usage states, avoiding the large amount of computing resources required when using only one model.

[0048] A pressure sensor is installed at the point where the headphones contact the ear. The DSP chip calculates the gain adjustment coefficient G based on the pressure value F, so that the headphones can automatically increase the volume when the pressure on them decreases, thus solving the problem of different listening volumes caused by different pressures.

[0049] A sleep mode is set up, which can automatically adjust the volume based on user feedback to avoid disturbing the user's sleep. Attached Figure Description

[0050] The accompanying drawings, included to provide a further understanding of the disclosed subject matter, are incorporated into and form part of this specification. The drawings also illustrate the implementation of the disclosed subject matter, and, together with the detailed description, serve to explain the principles of its implementation. No attempt is made to demonstrate excessive structural detail to provide a basic understanding of the disclosed subject matter and its various practical applications.

[0051] Figure 1 This is a schematic diagram of the overall architecture of the present invention;

[0052] Figure 2 This is a schematic diagram of the architecture of the monitoring module of the present invention. Detailed Implementation

[0053] The advantages, features, and methods of achieving the stated objectives of this invention will become clear from the accompanying drawings and the following detailed description.

[0054] Example 1:

[0055] An adaptive volume control headphone amplifier with DSP chip adjustment includes an amplification control module, a DSP chip, a current replication circuit, a monitoring module, and an output module.

[0056] The amplification control module connects the signal source and the output module. The signal source sends audio data to the amplification control module; the amplification control module amplifies the audio source signal and outputs it to the output module.

[0057] The DSP chip is connected to the amplification and control module, the current replication circuit is connected to the amplification and control module and the DSP chip, and the monitoring module is connected to the output module and the DSP chip.

[0058] The current replication circuit amplifies the control module to sample the signal current and sends the real-time playback current data of the amplification control module to the DSP chip.

[0059] The monitoring module collects the real-time playback signal from the output module, analyzes it, and sends it to the DSP chip.

[0060] The DSP chip is used to adjust the amplification factor of the amplification control module based on the input data.

[0061] The amplifier is located inside the earphone, and the monitoring module includes a microphone module, a timing module, a monitoring processor, a gravity sensor module, and a model parameter converter.

[0062] The output terminal of the output module is directly connected to the detection processor, enabling the detection processor to collect the output audio data A from the output terminal in real time;

[0063] The microphone module is mounted on the headset and is used to collect noise data B from the environment and send it to the monitoring processor;

[0064] The timing module records the amplifier's usage time and sends the usage time C to the monitoring processor in real time.

[0065] The gravity sensor module monitors the headphone's posture and sends the headphone's posture parameter D to the monitoring processor;

[0066] The monitoring processor connects to the model parameter converter, which converts the collected A, B, C, and D data into model parameters that the DSP can recognize and sends them to the DSP chip.

[0067] The current replication circuit takes the unamplified audio data E obtained from the D / A conversion of the signal source and sends it to the DSP chip after A / D conversion;

[0068] The DSP has a built-in amplification factor calculation model, which is used to calculate the amplification factor of the amplification control module based on the input data in order to adjust the amplification factor of the amplification control module.

[0069] The DSP chip analyzes the audio data E before amplification to obtain the energy M of the audio data E. E Crest Intensity A E ;

[0070] The audio data A collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the audio data A. A Crest Intensity A A ;

[0071] The noise data B collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the noise data B. B Crest Intensity A B ;

[0072] After the usage duration C is sent to the detection processor, it is converted into the usage duration level L, which includes 5-10 levels.

[0073] The processor can obtain the current time T, which is then converted into a time period level N. The time period level N includes two levels, corresponding to daytime and nighttime respectively.

[0074] The posture parameter D includes two states: upright and lying down.

[0075] The audio data E is acquired and processed in real time by the DSP chip, and the energy M of the audio data E is obtained in real time. E Crest Intensity A E The calculation is based on a segment of audio data E within a time period of 5-10 seconds prior to the current moment;

[0076] Audio data A and noise data B are processed by the monitoring processor every 10-60 seconds. That is, a segment of audio data A and noise data B is generated every 10-60 seconds, processed within the monitoring processor, and the energy M of the corresponding audio data A is obtained. A Crest Intensity A A The energy M of the noise data B B Crest Intensity A B ;

[0077] The data processed by the monitoring processor is organized within the model parameter converter, and then formed into a data format that the DSP can recognize; the data format obtained by the DSP chip from the model parameter converter is (M A A A M B A B ,L,N,D);

[0078] The model parameter converter sends a set of data to the DSP chip every 10s-60s.

[0079] This enables the DSP chip to obtain a set of model parameters every 10s-60s for selecting a calculation model. At the same time, the DSP chip uses the selected calculation model to calculate the amplification factor based on the audio data E in real time.

[0080] In the parameter M A A A Corresponding to the speaker's operating state, when M A A A If the threshold is exceeded, it indicates that the current operating gain of the speaker is too high. When M A A A If the gain is below the threshold, it indicates that the speaker's current operating gain is low.

[0081] In the parameter M B A B Corresponding to the ambient noise level, when M B A B If the threshold is exceeded, it indicates that the speaker environment is relatively noisy. When M B A B If the value is below the threshold, it indicates that the environment is relatively quiet;

[0082] The parameters L, N, and D correspond to usage duration, usage time period, and usage posture; the larger L is, the longer the usage time, N corresponds to daytime and nighttime, and D corresponds to whether to use in a lying position.

[0083] The DSP stores X different calculation models, X = K1 × K2 × K3 × K4 × K5; K1 corresponds to the number of speaker gain levels, K2 corresponds to the number of ambient noise levels, K3 corresponds to the number of usage duration levels L, K4 = 2 corresponds to daytime and nighttime, and K5 = 2 corresponds to standing and lying positions.

[0084] X models satisfy the following condition:

[0085] The higher the speaker gain, the lower the amplification factor obtained for the same audio data E in the corresponding model; the lower the speaker gain, the higher the amplification factor obtained for the same audio data E in the corresponding model; the higher the ambient noise, the higher the amplification factor obtained for the same audio data E in the corresponding model; the lower the ambient noise, the lower the amplification factor obtained for the same audio data E in the corresponding model; the longer the usage time, the lower the amplification factor obtained for the same audio data E in the corresponding model; the shorter the usage time, the higher the amplification factor obtained for the same audio data E in the corresponding model; the higher the amplification factor obtained for the same audio data E in the corresponding model when used during the day; the lower the amplification factor obtained for the same audio data E in the corresponding model when used at night; the higher the amplification factor obtained for the same audio data E when used in a standing position; the lower the amplification factor obtained for the same audio data E in a lying position.

[0086] The model selection includes BP neural network model, partial least squares model, linear model, SVM model, or empirical model.

[0087] Of course, in actual use, the models are not limited to the above types. Any model that meets the aforementioned conditions is acceptable. The specific amplification factor is the energy M of the audio data E. E Crest Intensity A E After inputting the model, the energy M is obtained based on the magnification factor. E Crest Intensity A E The smaller the value, the higher the magnification, and the energy M. E Crest Intensity A E The larger the amplification factor, the smaller the magnification factor, thus balancing the audio data from different sound sources and preventing the volume of certain songs or audio from being too low or too high, requiring frequent manual volume adjustments.

[0088] The interval between different songs is usually only a few seconds, hence the energy M E Crest Intensity A E The sampling interval is relatively small, resulting in good real-time adjustment. The user's usage status (e.g., day or night, lying down or sitting) and the device's working status (e.g., gain level or ambient noise level) generally do not change frequently, so there is no need to sample them frequently; the sampling setting can be done on the order of minutes.

[0089] Example 2:

[0090] The headphone amplifier with the structure described above also features an automatic sleep mode:

[0091] When the headphone amplifier is used between 20:00 and 6:00, the DSP chip sends a reduction amplification control command to the amplification module every 30 minutes, causing the amplification factor of the amplification control module to decrease and the headphone output volume to decrease. At the same time, the DSP chip waits for the activation signal from the monitoring module. When the DSP chip receives the activation signal, it sends a reduction amplification factor recovery command to the amplification module, causing the amplification factor of the amplification control module to recover and the headphone output volume to recover.

[0092] When the headphone amplifier is used between 20:00 and 6:00, the monitoring module sends an activation signal to the DSP chip when the accelerometer in the monitoring module detects vibration.

[0093] The DSP chip controls the headphone output volume to be reduced to one-third of the original volume. After three reductions, the headphone output volume is 0.

[0094] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A DSP chip-adaptive volume control headphone amplifier, comprising an amplification control module, a DSP chip, a current replication circuit, a monitoring module, and an output module; characterized in that: The amplification control module connects the signal source and the output module. The signal source sends audio data to the amplification control module; the amplification control module is used to amplify the audio source signal and output it to the output module. The DSP chip is connected to the amplification and control module, the current replication circuit is connected to the amplification and control module and the DSP chip, and the monitoring module is connected to the output module and the DSP chip. The current replication circuit samples the signal current from the amplification control module, thereby sending the real-time playback current data of the amplification control module to the DSP chip; The monitoring module collects the real-time playback signal from the output module, analyzes it, and sends it to the DSP chip. The DSP chip is used to adjust the amplification factor of the amplification control module based on the input data; The amplifier is located inside the earphone, and the monitoring module includes a microphone module, a timing module, a monitoring processor, a gravity sensor module, and a model parameter converter. The output terminal of the output module is directly connected to the detection processor, enabling the detection processor to collect the output audio data A from the output terminal in real time; The microphone module is mounted on the headset and is used to collect noise data B from the environment and send it to the monitoring processor; The timing module records the amplifier's usage time and sends the usage time C to the monitoring processor in real time. The gravity sensor module monitors the headphone's posture and sends the headphone's posture parameter D to the monitoring processor; The monitoring processor is connected to the model parameter converter, which converts the collected data of four types, A, B, C, and D, into model parameters that can be recognized by the DSP and sends them to the DSP chip. The current replication circuit takes the unamplified audio data E obtained from the D / A conversion of the signal source and sends it to the DSP chip after A / D conversion; The DSP has a built-in amplification factor calculation model, which is used to calculate the amplification factor of the amplification control module based on the input data in order to adjust the amplification factor of the amplification control module. A pressure sensor is also placed at the point where the headphones contact the ear. The pressure sensor outputs a pressure value F. The DSP chip calculates the gain adjustment coefficient G based on the pressure value F. G is inversely proportional to F, that is, the smaller F is, the larger G is, so that the headphones can automatically increase the volume when the pressure on the headphones decreases. The gain adjustment coefficient directly increases the amplification factor output by the calculation model within the DSP. In other words, it directly adds G to the amplification factor output by the calculation model within the DSP to obtain the actual amplification factor input to the amplification control module.

2. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 1, characterized in that: The DSP chip analyzes the audio data E before amplification to obtain the energy M of the audio data E. E Crest Intensity A E ; The audio data A collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the audio data A. A Crest Intensity A A ; The noise data B collected by the monitoring processor is analyzed in the detection processor to obtain the energy M of the noise data B. B Crest Intensity A B ; After the usage duration C is sent to the detection processor, it is converted into the usage duration level L, which includes 5-10 levels. The processor can obtain the current time T, which is then converted into a time period level N. The time period level N includes two levels, corresponding to daytime and nighttime respectively. The posture parameter D includes two states: upright and lying down.

3. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 2, characterized in that: The audio data E is acquired and processed in real time by the DSP chip, and the energy M of the audio data E is obtained in real time. E Crest Intensity A E The calculation is based on a segment of audio data E within a time period of 5-10 seconds prior to the current moment; Audio data A and noise data B are processed by the monitoring processor every 10-60 seconds. That is, a segment of audio data A and noise data B is generated every 10-60 seconds, processed within the monitoring processor, and the energy M of the corresponding audio data A is obtained. A Crest Intensity A A The energy M of the noise data B B Crest Intensity A B ; The data processed by the monitoring processor is organized within the model parameter converter, and then formed into a data format that the DSP can recognize; the data format obtained by the DSP chip from the model parameter converter is (M A A A M B A B ,L,N,D); The model parameter converter sends a set of data to the DSP chip every 10s-60s. This enables the DSP chip to obtain a set of model parameters every 10s-60s for selecting a calculation model. At the same time, the DSP chip uses the selected calculation model to calculate the amplification factor based on the audio data E in real time.

4. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 3, characterized in that: In the parameter M A A A Corresponding to the speaker's operating state, when M A A A If the threshold is exceeded, it indicates that the current operating gain of the speaker is too high. When M A A A If the gain is below the threshold, it indicates that the speaker's current operating gain is low. In the parameter M B A B Corresponding to the ambient noise level, when M B A B If the threshold is exceeded, it indicates that the speaker environment is relatively noisy. When M B A B If the value is below the threshold, it indicates that the environment is relatively quiet; The parameters L, N, and D correspond to usage duration, usage time period, and usage posture; the larger L is, the longer the usage time, N corresponds to daytime and nighttime, and D corresponds to whether to use in a lying position. The DSP stores X different calculation models, X = K1×K2×K3×K4×K5; K1 corresponds to the number of speaker gain state levels, K2 corresponds to the number of ambient noise levels, K3 corresponds to the number of usage time level L levels, K4=2 corresponds to daytime and nighttime, and K5=2 corresponds to standing and lying positions. X models satisfy the following condition: The higher the speaker gain, the lower the amplification factor obtained for the same audio data E in the corresponding model; the lower the speaker gain, the higher the amplification factor obtained for the same audio data E in the corresponding model. The greater the ambient noise, the higher the amplification factor obtained for the same audio data E in the corresponding model; The lower the ambient noise, the lower the amplification factor obtained for the same audio data E in the corresponding model. The longer the usage time, the lower the amplification factor obtained for the same audio data E in the corresponding model; the shorter the usage time, the higher the amplification factor obtained for the same audio data E in the corresponding model; when used during the day, the amplification factor obtained for the same audio data E in the corresponding model is higher; when used at night, the amplification factor obtained for the same audio data E in the corresponding model is lower; when used in a standing position, the amplification factor obtained for the same audio data E in the corresponding model is higher; when used in a lying position, the amplification factor obtained for the same audio data E in the corresponding model is lower.

5. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 4, characterized in that: The model selection includes BP neural network model, partial least squares model, linear model, SVM model, or empirical model.

6. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 1, characterized in that: When the headphone amplifier is used between 20:00 and 6:00, the DSP chip sends a reduction amplification control command to the amplification module every 30 minutes, causing the amplification factor of the amplification control module to decrease and the headphone output volume to decrease. At the same time, the DSP chip waits for the activation signal from the monitoring module. When the DSP chip receives the activation signal, it sends a reduction amplification factor recovery command to the amplification module, causing the amplification factor of the amplification control module to recover and the headphone output volume to recover.

7. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 6, characterized in that: When the headphone amplifier is used between 20:00 and 6:00, the monitoring module sends an activation signal to the DSP chip when the accelerometer in the monitoring module detects vibration.

8. The adaptive volume control headphone amplifier regulated by the DSP chip according to claim 6, characterized in that: The DSP chip controls the headphone output volume to be reduced to one-third of the original volume. After three reductions, the headphone output volume is 0.

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