CN216982106U - Audio processing circuit and open type audio equipment - Google Patents
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Abstract
The utility model discloses an audio processing circuit and open audio equipment, which are applied to the field of audio processing and comprise: the audio input module is used for acquiring an audio input signal; the noise input module is used for acquiring a noise signal; the signal control module is used for receiving the audio input signal and processing the audio input signal to output a first audio signal; and the audio feedback module is used for processing the received audio input signal or the first audio signal and the noise signal and outputting a feedback signal to the signal control module, and the signal control module updates the first audio signal according to the feedback signal. The circuit generates a feedback signal through an audio input signal or a first audio signal and a noise signal, updates the first audio signal, enables the first audio signal to be higher than the noise signal by a specific value, ensures that a user can clearly listen to playing contents, avoids signal leakage to the surrounding environment, and improves the privacy of audio equipment.
Description
Technical Field
The present invention relates to the field of audio processing, and in particular, to an audio processing circuit and an open audio device.
Background
In modern life, the use of audio devices is increasing day by day, and audio devices include open audio devices, which are audio playback devices capable of keeping the ear canals of users open, including sound boxes, open earphones, audio glasses, smart headrests, and the like. However, when the open-type audio device is used, the ear canal of the user is kept open, so that the sound reproduced by the open-type audio device leaks to the surrounding environment, is easily heard by others, affects others, and simultaneously, the noise privacy is also leaked.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides an audio processing circuit and an open type audio device, which can improve the privacy of the open type audio device and ensure that the sound of the open type audio device can not be heard by others.
In a first aspect, the present invention provides an audio processing circuit comprising:
the audio input module is used for acquiring an audio input signal;
a noise input module for obtaining a noise signal;
the signal control module is connected with the audio input module and is used for receiving the audio input signal and processing the audio input signal to output a first audio signal;
the audio feedback module is used for processing the received audio input signal or the first audio signal and the noise signal and outputting a feedback signal to the signal control module, and the signal control module updates the first audio signal according to the feedback signal.
The audio processing circuit provided by the utility model at least has the following beneficial effects: the audio input module is used for acquiring an audio input signal, the noise input module is used for acquiring a noise signal, the signal control module processes the audio input signal and generates a first audio signal, the audio feedback module processes the first audio signal and the noise signal and outputs a feedback signal to the signal control module, in addition, the audio feedback module can process the audio input signal and the noise signal and outputs the feedback signal to the signal control module, the signal control module can update the first audio signal according to the feedback signal, generate the feedback signal according to the audio input signal or the first audio signal and the noise signal, and update the first audio signal through the feedback signal and the audio input signal, so that the first audio signal is higher than the noise signal by a specific value, when a user can be ensured to hear the audio processing circuit and the playing content of equipment applying the audio processing circuit, further avoiding the audio output signal from leaking to the surrounding environment and improving the privacy of the audio processing circuit and the corresponding equipment.
According to some embodiments of the present invention, the audio feedback module comprises a first comparator, an input terminal of the first comparator is connected to the output terminal of the noise input module and the output terminal of the signal control module, respectively, and an output terminal of the first comparator is connected to the input terminal of the signal control module.
According to some embodiments of the utility model, the audio feedback module comprises a second comparator, an input end of the second comparator is connected with an output end of the noise input module and an output end of the audio input module respectively, and an output end of the second comparator is connected with an input end of the signal control module.
According to some embodiments of the utility model, the noise input module comprises a first microphone for picking up a noise signal, the audio processing circuit further comprises a voice cancellation module, an input of the voice cancellation module is connected to an output of the noise input module, and an output of the voice cancellation module is connected to an input of the audio feedback module.
According to some embodiments of the utility model, the speech cancellation module comprises:
the input end of the voice noise reducer is connected with the output end of the first sound pick-up;
the input end of the first subtracter is respectively connected with the output ends of the first sound pickup and the voice noise reducer, and the output end of the first subtracter is connected with the input end of the audio feedback module.
According to some embodiments of the present invention, the noise input module further includes a second microphone for picking up a voice signal of a user, the voice cancellation module includes a second subtracter, an input end of the second subtracter is connected to output ends of the first microphone and the second microphone respectively, and an output end of the second subtracter is connected to an input end of the audio feedback module.
According to some embodiments of the present invention, the audio processing circuit further includes an equalizer, an input end of the equalizer is connected to an output end of the audio input module, and an output end of the equalizer is connected to an input end of the signal control module, or an input end of the equalizer is connected to an output end of the signal control module, and an output end of the equalizer is configured to output the processed first audio signal.
According to some embodiments of the utility model, the signal control module comprises a first controller, an input end of the first controller is connected with the audio input module and an output end of the audio feedback module, and an output end of the first controller is used for outputting the processed first audio signal.
According to some embodiments of the utility model, the signal control module comprises a second controller, an input of the second controller is connected with the audio input module and an output of the audio feedback module, and an output of the second controller is connected with the audio output module and outputs the first audio signal.
In a second aspect, the present invention provides an open audio device comprising:
the audio processing circuit of the first aspect;
and the audio output module is connected with the signal control module and is used for receiving the first audio signal and outputting an audio output signal.
Since the open audio device of the second aspect is applied to the audio processing circuit of any one of the first aspect, all the advantageous effects of the first aspect of the present invention are obtained.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the related technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without inventive labor.
FIG. 1 is a functional block diagram of an open audio device provided by one embodiment of the present application;
FIG. 2 is a functional block diagram of an open audio device provided by one embodiment of the present application;
fig. 3 is a block diagram of an open audio device according to an embodiment of the present application;
fig. 4 is another block diagram of an open audio device according to an embodiment of the present application;
FIG. 5 is a block diagram of a speech cancellation module of an audio processing circuit according to an embodiment of the present application;
FIG. 6 is another block diagram of a voice elimination module of an audio processing circuit according to an embodiment of the present application;
fig. 7 is a block diagram of an open audio device with an equalizer according to an embodiment of the present application;
fig. 8 is another block diagram of an open audio device with an equalizer according to an embodiment of the present application;
fig. 9 is another block diagram of an open audio device with an equalizer according to an embodiment of the present application;
fig. 10 is another block diagram of an open audio device with an equalizer according to an embodiment of the present application;
fig. 11 is a graph illustrating a frequency response characteristic of an audio input signal according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the embodiments of the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present application with unnecessary detail.
It should be noted that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different from that in the flowcharts. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
It should also be appreciated that reference throughout the specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In the description of the embodiments of the present application, unless otherwise explicitly limited, terms such as setting, mounting, connecting and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present application by combining the specific contents of the technical solutions.
In modern life, the use of audio devices is increasing day by day, and audio devices include open audio devices, which are audio playback devices capable of keeping the ear canals of users open, including sound boxes, open earphones, audio glasses, smart headrests, and the like. Open audio equipment such as open earphone, audio frequency glasses and intelligent headrest all have in the acoustics design and consider privacy nature, also can all realize the privacy of certain degree, but if user's volume is too big, still can let the content that the user listened to of next people's clarity.
Based on this, the embodiments of the present application provide an audio processing circuit and an open audio device, where the audio processing circuit improves the privacy of the open audio device in terms of reducing the sound pressure heard by the user and optimizing the output frequency response characteristic. Wherein, in order to ensure that the user can hear the content clearly, the output sound pressure of the device is higher than the ambient noise by a specific value, usually not lower than 10dB, for the signal received by the ear canal of the user, and the specific value can be controlled within the range of 3dB to 40dB according to the personal preference of the user in practical requirements. For optimization of output frequency response characteristics, high frequency signals can be attenuated appropriately when listening to music, and if talking, low frequency signals and high frequency signals can be attenuated simultaneously or only high frequency signals can be attenuated.
The embodiments of the present application will be further explained with reference to the drawings.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic block diagram of an open audio device provided in an embodiment of the present application, and fig. 2 is a schematic block diagram of an open audio device provided in an embodiment of the present application. In the example of fig. 1 and 2, the audio processing circuit comprises:
the audio input module 100, the audio input module 100 is used for obtaining an audio input signal.
It can be understood that the source of the audio input signal is many, the audio input signal may be from a chip of an audio device such as a sound box, audio glasses, an intelligent headrest, etc., and when the audio device is connected to another terminal, the signal of the other terminal is transmitted to the audio device and processed into the audio input signal by the audio device.
The noise input module 200, the noise input module 200 is used for obtaining a noise signal.
The signal control module 300 is connected to the audio input module 100, and the signal control module 300 is configured to receive an audio input signal and process the audio input signal to output a first audio signal.
It is understood that the functions of the signal control module 300 may include a digital signal processor, a microprocessor, a single chip, etc.
The audio feedback module 400 is configured to process the received audio input signal or the first audio signal and the noise signal and output a feedback signal to the signal control module 300, and the signal control module 300 updates the first audio signal according to the feedback signal.
It can be understood that, as shown in fig. 1, the input terminal of the audio feedback module 400 is respectively connected to the output terminal of the noise input module 200 and the input terminal of the signal control module 300, the output terminal of the audio feedback module 400 is connected to the input terminal of the signal control module 300, and the signal control module 300 updates the first audio signal according to the received feedback signal, which is a feedback control.
It is understood that, as shown in fig. 2, the input terminal of the audio feedback module 400 is connected to the output terminal of the noise input module 200 and the input terminal of the audio input module 100, the output terminal of the audio feedback module 400 is connected to the input terminal of the signal control module 300, and the signal control module 300 updates the first audio signal according to the received feedback signal, which is a feedforward control.
It can be understood that, the audio input module is used for acquiring an audio input signal, the noise input module is used for acquiring a noise signal, the signal control module processes the audio input signal and generates a first audio signal, the audio feedback module processes the first audio signal and the noise signal and outputs a feedback signal to the signal control module, in addition, the audio feedback module can process the audio input signal and the noise signal and outputs a feedback signal to the signal control module, the signal control module can update the first audio signal according to the feedback signal, generate a feedback signal according to the audio input signal or the first audio signal and the noise signal, and update the first audio signal through the feedback signal and the audio input signal, so that the first audio signal is higher than the noise signal by a specific value, while ensuring that a user can hear the audio processing circuit and the device applying the audio processing circuit playing content, further, the audio output signal is prevented from leaking to the surrounding environment, and the privacy of the audio processing circuit and the corresponding equipment is improved.
It should be noted that, referring to fig. 3, the audio feedback module 400 includes a first comparator, an input terminal of the first comparator is connected to the output terminal of the noise input module 200 and the output terminal of the signal control module 300, respectively, and an output terminal of the first comparator is connected to the input terminal of the signal control module 300.
It is understood that, when the control mode is the feedback control, the first comparator receives the noise signal from the output terminal of the noise input module 200 and the first audio signal from the output terminal of the signal control module 300, compares the noise signal with the first audio signal, and sends the comparison result to the input terminal of the signal control module 300 through the output terminal.
It should be noted that, referring to fig. 4, the audio feedback module 400 includes a second comparator, an input terminal of the second comparator is connected to the output terminal of the noise input module 200 and the output terminal of the audio input module 100, respectively, and an output terminal of the second comparator is connected to an input terminal of the signal control module 300.
It is understood that when the control mode is the feedforward control, the second comparator receives the noise signal from the output terminal of the noise input module 200 and the audio input signal from the output terminal of the audio input module 100, compares the magnitudes of the noise signal and the audio input signal, and sends the comparison result to the input terminal of the signal control module 300 through the output terminal.
It should be noted that, referring to fig. 3 and 4, the noise input module 200 includes a first microphone for picking up a noise signal, the audio processing circuit further includes a voice cancellation module 500, an input end of the voice cancellation module 500 is connected to an output end of the noise input module 200, and an output end of the voice cancellation module 500 is connected to an input end of the audio feedback module 400.
It can be understood that the input terminal of the speech cancellation module 500 is connected to the output terminal of the noise input module 200, the speech cancellation module 500 receives the noise signal from the output terminal of the noise input module 200, filters the user's voice in the noise signal, and sends the processed noise signal to the input terminal of the audio feedback module 400, and the speech cancellation module 500 is configured to prevent the misjudgment of the noise signal caused by the user speaking.
It should be noted that, referring to fig. 5, the voice elimination module 500 includes a voice noise reducer and a first subtractor, wherein an input end of the voice noise reducer is connected to an output end of the first sound pickup, an input end of the first subtractor is respectively connected to output ends of the first sound pickup and the voice noise reducer, and an output end of the first subtractor is connected to an input end of the audio feedback module 400.
It can be understood that the noise signal obtained by the first sound pick-up is a mixed signal with environmental noise and user voice, according to the frequency spectrum characteristics of the human voice, the voice noise reducer extracts the human voice signal from the noise signal by analyzing the frequency spectrum of the noise signal and sends the human voice to the input end of the first subtracter, the first subtracter also receives the noise signal from the first sound pick-up, and the first subtracter processes the noise signal and the human voice signal, so that the noise signal without the human voice can be obtained, and misjudgment of the noise signal caused by the user speaking can be prevented.
It should be noted that, referring to fig. 6, the noise input module 200 further includes a second microphone for picking up a voice signal of a user, the voice eliminating module 500 includes a second subtracter, an input end of the second subtracter is connected to output ends of the first microphone and the second microphone respectively, and an output end of the second subtracter is connected to an input end of the audio feedback module 400.
It can be understood that the first sound pick-up device mainly picks up ambient noise and the second sound pick-up device mainly picks up human voice signals of a user through the arrangement of the positions of the first sound pick-up device and the second sound pick-up device. Although the signals picked up by the first sound pick-up and the second sound pick-up are all composite signals, the signals picked up by the first sound pick-up are strong in environmental noise and weak in human voice signals, the signals picked up by the second sound pick-up are weak in environmental noise and strong in human voice signals, the first subtracter processes the two paths of received mixed signals, the noise signals after human voice is removed can be obtained, and misjudgment of the noise signals caused by speaking of a user can be prevented.
It should be noted that, referring to fig. 7 to 10, the audio processing circuit further includes an equalizer, and the equalizer is used for adjusting the frequency response of the audio output signal.
It will be appreciated that the high frequencies of the audio output signal frequency are suppressed by the adjustment of the audio output signal frequency response.
It can be understood that, referring to fig. 11, fig. 11 is a frequency response characteristic graph of an audio input signal according to an embodiment of the present application, where an independent variable corresponding to the frequency response characteristic graph is frequency, a dependent variable is sound pressure, that is, a horizontal axis of the frequency response characteristic graph of the audio input signal is frequency and has a unit of Hz, and a vertical axis of the frequency response characteristic graph of the audio input signal is sound pressure and has a unit of dB. In order to improve the privacy of the audio processing circuit and the corresponding equipment, the sound pressure corresponding to the high-frequency signal during conversation and music can be reduced, in addition, the sound pressure corresponding to the low-frequency signal during conversation can be reduced, and the attenuation amplitude can be 20kHz and/or 20Hz is lower than 1kHz by not less than 6 dB.
It should be noted that, referring to fig. 8 and 10, an input terminal of the equalizer is connected to an output terminal of the audio input module 100, and an output terminal of the equalizer is connected to an input terminal of the signal control module 300.
It should be noted that, referring to fig. 7 and fig. 9, an input terminal of the equalizer is connected to an output terminal of the signal control module 300, and an output terminal of the equalizer is used for outputting the processed first audio signal.
It should be noted that the function of the signal control module is implemented by a Digital Signal Processor (DSP).
It is understood that the signal control module comprises a first controller, an input end of the first controller is connected with the audio input module and an output end of the audio feedback module, and an output end of the first controller is used for outputting a first audio signal.
It is understood that the signal control module includes a second controller, an input end of the second controller is connected with the audio input module and the output end of the audio feedback module, and an output end of the second controller is connected with the audio output module and outputs the first audio signal.
It can be understood that the function of the signal control module can also be realized by a microprocessor, a singlechip and the like.
It can be understood that, the audio input module is used for acquiring an audio input signal, the noise input module is used for acquiring a noise signal, the signal control module processes the audio input signal and generates a first audio signal, the audio feedback module processes the first audio signal and the noise signal and outputs a feedback signal to the signal control module, in addition, the audio feedback module can also process the audio input signal and the noise signal and outputs a feedback signal to the signal control module, the signal control module can update the first audio signal according to the feedback signal, generate a feedback signal according to the audio input signal or the first audio signal and the noise signal, and update the first audio signal through the feedback signal and the audio input signal, so that the first audio signal is higher than the noise signal by a specific value. By setting the equalizer to optimize the frequency response of the audio output signal and suppress the high-frequency signal or suppress the high-frequency signal and the low-frequency signal, the user can listen to the audio processing circuit and the playing content of the device using the audio processing circuit, the audio output signal is further prevented from leaking to the surrounding environment, and the privacy of the audio processing circuit and the corresponding device is improved.
In addition, referring to fig. 1 to 10, an embodiment of the present application further provides an open audio device, which includes an audio processing circuit and an audio output module 600, where the audio output module 600 is connected to the signal control module 300, and the audio output module 600 is configured to receive a first audio signal and output an audio output signal.
It is understood that the audio output module 600 is a speaker.
It can be understood that the open type audio devices are various, and for different open type audio devices, specific accessories thereof may be added on the basis of the audio processing circuit and the audio output module 600 according to actual needs, for example, for a bluetooth open type earphone, the open type audio device is bluetooth connected with other terminals, the bluetooth open type earphone further includes a bluetooth chip, the bluetooth chip is connected with the audio processing circuit, and the bluetooth chip may process signals from other terminals and generate audio input signals. For audio glasses, the open audio equipment comprises a glasses frame, a microprocessor, an audio processing circuit, a loudspeaker and the like, the open audio equipment is in communication connection with other terminals through the microprocessor and transmits corresponding audio signals, the microprocessor is connected with the audio processing circuit to transmit audio input signals to the audio processing circuit, the audio processing circuit is connected with the loudspeaker, and the audio signals can be output through the loudspeaker and the audio processing circuit.
It can be understood that the open-type audio device controls the audio output signal output by the audio output module 600 through the audio processing circuit, so that the user can listen to the audio processing circuit and the content played by the device using the audio processing circuit, and the audio output signal is further prevented from leaking to the surrounding environment, thereby improving the privacy of the audio processing circuit and the corresponding device.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An audio processing circuit, comprising:
the audio input module is used for acquiring an audio input signal;
a noise input module for obtaining a noise signal;
the signal control module is connected with the audio input module and is used for receiving the audio input signal and processing the audio input signal to output a first audio signal;
the audio feedback module is used for processing the received audio input signal or the first audio signal and the noise signal and outputting a feedback signal to the signal control module, and the signal control module updates the first audio signal according to the feedback signal.
2. The audio processing circuit of claim 1, wherein the audio feedback module comprises a first comparator, an input terminal of the first comparator is connected to the output terminal of the noise input module and the output terminal of the signal control module, respectively, and an output terminal of the first comparator is connected to the input terminal of the signal control module.
3. The audio processing circuit of claim 1, wherein the audio feedback module comprises a second comparator, an input terminal of the second comparator is connected to the output terminal of the noise input module and the output terminal of the audio input module, respectively, and an output terminal of the second comparator is connected to the input terminal of the signal control module.
4. The audio processing circuit of claim 1, wherein the noise input module comprises a first microphone configured to pick up a noise signal, and wherein the audio processing circuit further comprises a speech cancellation module, wherein an input of the speech cancellation module is connected to an output of the noise input module, and wherein an output of the speech cancellation module is connected to an input of the audio feedback module.
5. The audio processing circuit of claim 4, wherein the speech cancellation module comprises:
the input end of the voice noise reducer is connected with the output end of the first sound pick-up;
the input end of the first subtracter is connected with the output ends of the first sound pickup and the voice noise reducer respectively, and the output end of the first subtracter is connected with the input end of the audio feedback module.
6. The audio processing circuit of claim 4, wherein the noise input module further comprises:
the second adapter, the second adapter is used for picking up user's speech signal, the pronunciation elimination module includes the second subtracter, the input of second subtracter respectively with first adapter with the output of second adapter is connected, the output of second subtracter with the input of audio feedback module is connected.
7. The audio processing circuit according to claim 1, further comprising an equalizer, wherein an input of the equalizer is connected to an output of the audio input module, and an output of the equalizer is connected to an input of the signal control module, or wherein an input of the equalizer is connected to an output of the signal control module, and an output of the equalizer is used for outputting the processed first audio signal.
8. The audio processing circuit of claim 1, wherein the signal control module comprises a first controller, an input of the first controller is connected to the audio input module and an output of the audio feedback module, and an output of the first controller is used for outputting the first audio signal.
9. The audio processing circuit of claim 1, wherein the signal control module comprises a second controller, an input of the second controller is connected to the audio input module and an output of the audio feedback module, and an output of the second controller is connected to the input of the audio feedback module and outputs the first audio signal.
10. An open audio device, comprising:
the audio processing circuit of any of claims 1 to 9;
and the audio output module is connected with the signal control module and is used for receiving the first audio signal and outputting an audio output signal.
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