CN112995850A - Self-adaptive audio circuit and self-adaptive audio device - Google Patents
Self-adaptive audio circuit and self-adaptive audio device Download PDFInfo
- Publication number
- CN112995850A CN112995850A CN202110120385.5A CN202110120385A CN112995850A CN 112995850 A CN112995850 A CN 112995850A CN 202110120385 A CN202110120385 A CN 202110120385A CN 112995850 A CN112995850 A CN 112995850A
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- audio
- bias
- type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003750 conditioning effect Effects 0.000 claims abstract description 58
- 230000005236 sound signal Effects 0.000 claims abstract description 21
- 230000003044 adaptive effect Effects 0.000 claims description 37
- 230000001143 conditioned effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 24
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 241000233805 Phoenix Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The application discloses self-adaptation audio circuit and self-adaptation audio device, self-adaptation audio circuit includes: the device comprises an audio input interface, a control circuit, a bias circuit, a signal conditioning circuit and a processing circuit, wherein the audio input interface is used for receiving an audio signal input by audio equipment; the control circuit is used for generating a control signal so as to control the bias circuit to generate a bias signal based on the type of the audio equipment; the signal conditioning circuit is connected with the audio input interface and the bias circuit through the control circuit and used for generating a conditioning signal based on at least one of a control signal, an audio signal or a bias signal; the processing circuit is connected with the signal conditioning circuit and used for identifying the audio signal or the conditioning signal so as to detect the type of the audio equipment and setting a corresponding gain value for the conditioning signal based on the type of the audio equipment. By means of the mode, the type of the audio equipment can be automatically identified, and automatic gain value setting is achieved.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a self-adaptive audio circuit and a self-adaptive audio device.
Background
There are many devices in electronic products that include audio functionality that provide two different audio input interfaces: the microphone comprises a linear input (line in) and a microphone input (mic in), wherein the input sound sources of the two interfaces are different, the input sound source of the linear input interface is mainly the output audio of another electronic device (including an active sound pickup), the signal amplitude is large, and power does not need to be supplied to the linear input interface; the microphone input interface is generally connected with a passive sound pickup, the signal amplitude is small, and power needs to be supplied to the microphone input interface.
The existing equipment separates a linear input interface and a microphone input interface and cannot be used in a mixed way; because there is no circuit providing bias voltage and resistance, a general linear input interface generally does not support accessing a passive microphone, but there is a need for a linear input interface of a device to support accessing a passive microphone, for such a need, an electronic device directly replaces a circuit of a linear input part with a circuit of a microphone input, and configures a gain through software, but if a user needs to access a linear input device at the linear input interface, the firmware needs to be upgraded again, because the software gains of the linear input interface and the microphone input interface are different, and even if the same hardware gain is configured, compatibility cannot be achieved on one set of software.
Disclosure of Invention
The application provides a self-adaptation audio circuit and self-adaptation audio device, can automatic identification audio equipment's type, and realize the corresponding gain value of automatic setting.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided an adaptive audio circuit comprising: the device comprises an audio input interface, a control circuit, a bias circuit, a signal conditioning circuit and a processing circuit, wherein the audio input interface is used for receiving an audio signal input by audio equipment; the control circuit is used for generating a control signal to control the bias circuit to generate a bias signal based on the type of the audio equipment; the signal conditioning circuit is connected with the audio input interface, the bias circuit and the control circuit and is used for generating a conditioning signal based on at least one of a control signal, an audio signal or a bias signal; the processing circuit is connected with the signal conditioning circuit and used for identifying the audio signal or the conditioning signal so as to detect the type of the audio equipment and set a corresponding gain value for the conditioning signal based on the type of the audio equipment.
In order to solve the above technical problem, another technical solution adopted by the present application is: an adaptive audio device is provided, which includes an adaptive audio circuit, and the adaptive audio circuit is the adaptive audio circuit in the above technical solution.
Through the scheme, the beneficial effects of the application are that: the adaptive audio circuit comprises an audio input interface, a control circuit, a biasing circuit, a signal conditioning circuit and a processing circuit; receiving an audio signal input by an audio device through an audio input interface; the control circuit can output a control signal to realize the control of the bias circuit, so that the bias circuit can output a bias signal to the signal conditioning circuit when needed to provide bias voltage and bias resistance for the circuit; the signal conditioning circuit can receive one or more of a control signal, an audio signal or a bias signal and process the received signal to obtain a conditioning signal; the processing circuit detects the audio signals or the conditioning signals, the type of the accessed audio equipment can be identified, so that the corresponding gain value can be set according to the type of the audio equipment, the audio equipment of different types can be accessed by using one audio input interface and can be normally used, and due to the fact that the gain value can be automatically adjusted, firmware does not need to be upgraded according to the type of the accessed audio equipment, and the realization is simple.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and 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 to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic diagram of an embodiment of an adaptive audio circuit provided in the present application;
FIG. 2 is a schematic diagram of another embodiment of an adaptive audio circuit provided in the present application;
FIG. 3 is a schematic diagram of an adaptive audio circuit according to another embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a control circuit provided herein;
FIG. 5 is a schematic diagram of an adaptive audio circuit according to another embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an embodiment of an adaptive audio device provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The existing solution of using a microphone input interface for a linear input interface has the following problems:
1) since the software gain value is configured as the gain of the microphone input interface, the linear input interface is no longer simultaneously supported.
2) Different interface types need to be supported by upgrading the firmware, self-adaption cannot be achieved, and the use is troublesome.
3) The circuitry of the microphone input interface may not be able to fully support the audio source of the linear input interface.
In view of the fact that a scheme of an adaptive audio linear input interface and a scheme of a microphone input interface are not available at present, the application provides an adaptive audio circuit which can realize recognition of the linear input interface and the microphone input interface and automatic switching of software gain values, and different firmware does not need to be upgraded according to access types.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an adaptive audio circuit provided in the present application, the adaptive audio circuit including: audio input interface 11, control circuit 12, bias circuit 13, signal conditioning circuit 14, and processing circuit 15.
The audio input interface 11 is connected to an audio device (not shown in the drawings) and is configured to receive an audio signal input by the audio device, specifically, the audio input interface 11 is an external interface, and the interface form is not limited, such as: jack plugs, which may be 3.5mm, and phoenix terminals, etc., and the audio device may be a passive microphone (i.e., a device having a microphone input interface, or may be referred to as a microphone input device) or an audio linear input device (i.e., a device having a linear input interface).
The control circuit 12 is connected with the bias circuit 13, and the control circuit 12 is used for generating a control signal to control the bias circuit 13 to generate a bias signal based on the type of the audio equipment; specifically, the control circuit 12 mainly controls the bias voltage and the power supply voltage of the signal conditioning circuit 14, which may be implemented by a switching circuit; the bias circuit 13 mainly provides bias voltage and bias resistance required when the passive sound pick-up is connected, and the values of the bias voltage and the bias resistance need to be considered to cause no influence on linear input equipment; when the type of the audio equipment is microphone input, namely the audio equipment is a passive sound pick-up, the bias circuit 13 generates a bias signal; when the type of the audio device is a linear input, that is, the audio device is a linear input device, the bias circuit 13 stops generating the bias signal.
The signal conditioning circuit 14 is connected with the audio input interface 11, the control circuit 12 and the bias circuit 13, and the signal conditioning circuit 14 is configured to generate a conditioning signal based on at least one of a control signal, an audio signal or a bias signal; for example, the signal conditioning circuit 14 processes the control signal and the audio signal to generate a conditioned signal; or the signal conditioning circuit 14 processes the control signal, the audio signal, and the bias signal to generate a conditioned signal.
The processing circuit 15 is connected to the signal conditioning circuit 14, and the processing circuit 15 is configured to identify the audio signal or the conditioned signal to detect the type of the audio device, and set a corresponding gain value for the conditioned signal based on the type of the audio device; specifically, the gain value is a software gain value that can be set to 35dB if the type of audio device is a microphone input; if the type of audio device is a linear input, the software gain value may be set to 6 dB.
The adaptive audio circuit provided by the embodiment can be applied to the audio field and various devices with audio functions, and receives an audio signal output by the audio device through the audio input interface, and if the type of the audio device is microphone input, the control circuit can control the bias circuit to generate a bias signal so as to provide corresponding bias voltage and bias resistance; if the type of the audio equipment is linear input, the control circuit can control the bias circuit to stop generating the bias signal; the signal conditioning circuit can generate a conditioning signal according to the received signal; the processing circuit can analyze the audio signal or the conditioning signal, identify the type of the audio equipment, and set a corresponding software gain value according to the identified type, so that different types of audio equipment can be accessed and normally used by using one audio input interface, the software gain value can be automatically adjusted, and the firmware is not required to be upgraded according to the type of the accessed audio equipment.
Referring to fig. 2 to 5, fig. 2 is a schematic structural diagram of another embodiment of an adaptive audio circuit provided in the present application, the adaptive audio circuit including: audio input interface 11, control circuit 12, bias circuit 13, signal conditioning circuit 14, processing circuit 15, and protection circuit 16.
The audio input interface 11 is used for receiving an audio signal input by an audio device.
The protection circuit 16 is connected to the audio input interface 11 and the bias circuit 13, and is configured to protect the audio input interface 11 and the bias circuit 13; specifically, any external interface of the device needs to be provided with a protection mechanism to protect against interference such as surge and static electricity, and the protection circuit 16 of this embodiment may protect the bias circuit 13 in addition to protecting the audio input interface 11, because the bias circuit 13 needs to be connected to a power supply, if the bias circuit 13 is not protected, the bias circuit 13 may be affected by the power supply corresponding to the linear input device.
In a specific embodiment, as shown in fig. 3, the protection circuit 16 includes a sixth resistor R6, a surge suppressor Z, and a diode D, and the bias circuit 13 includes a seventh resistor R7; one end of the surge suppressor Z is connected with the audio input interface 11, the other end of the surge suppressor Z is grounded, and the surge suppressor Z can be a bidirectional voltage-stabilizing tube; one end of the sixth resistor R6 is connected to one end of the surge suppressor Z, and the other end of the sixth resistor R6 is connected to the signal conditioning circuit 14; the anode of the diode D is connected with one end of the seventh resistor R7, and the cathode of the diode D is connected with the other end of the sixth resistor R6; the other end of the seventh resistor R7 receives the control signal Vcon.
The control circuit 12 is used for generating a control signal Vcon to control the bias circuit 13 to generate a bias signal based on the type of the audio device; specifically, as shown in fig. 4, the control circuit 12 includes a second switch circuit 121, an input terminal of the second switch circuit 121 receives the power supply signal Vcc, an output terminal of the second switch circuit 121 is connected to the bias circuit 13 and the signal conditioning circuit 14, an enable terminal of the second switch circuit 121 is connected to the processor 152 to receive the enable signal EN output by the processor 152, and when the enable signal EN is at a high level, the second switch circuit 121 is turned on to output the control signal Vcon.
The signal conditioning circuit 14 is connected to the protection circuit 16, which is the core of the adaptive audio circuit and directly determines the quality of the audio, as shown in fig. 3, the signal conditioning circuit 14 includes a first capacitor C1 to a fifth capacitor C5, an amplifier U, and a first resistor R1 to a fifth resistor R5.
Further, one end of the first capacitor C1 is connected to the audio input interface 11, and the other end of the first capacitor C1 is connected to the first input end of the amplifier U through the first resistor R1; specifically, the first input terminal is an inverting input terminal, the first capacitor C1 is a dc blocking capacitor, one end of the first capacitor C1 is connected to the other end of the sixth resistor R6, the other end of the first capacitor C1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the inverting input terminal of the amplifier U. One end of the second resistor R2 receives the control signal Vcon, and the other end of the second resistor R2 is connected to the second input end of the amplifier U through the third resistor R3; specifically, the second input terminal is a non-inverting input terminal, the other end of the second resistor R2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the non-inverting input terminal of the amplifier U. One end of the fourth resistor R4 is connected to the other end of the second resistor R2, the other end of the fourth resistor R4 is grounded, the second capacitor C2 is connected in parallel with the fourth resistor R4, that is, one end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end of the second capacitor C2 is grounded. The fifth resistor R5 is connected to the first input terminal of the amplifier U and the output terminal of the amplifier U, respectively, and the third capacitor C3 is connected in parallel to the fifth resistor R5, that is, one end of the fifth resistor R5 is connected to the non-inverting input terminal of the amplifier U and one end of the third capacitor C3, and the other end of the fifth resistor R5 is connected to the output terminal of the amplifier U and the other end of the third capacitor C3. The fourth capacitor C4 is connected to the output terminal of the amplifier U and the processing circuit 15, specifically, the fourth capacitor C4 is a dc blocking capacitor, one end of the fourth capacitor C4 is connected to the output terminal of the amplifier U, and the other end of the fourth capacitor C4 is connected to the audio codec circuit 151. The power supply end of the amplifier U receives the control signal Vcon, the grounding end of the amplifier U is grounded, and the amplifier U can be an operational amplifier and can perform amplification processing based on signals of the non-inverting input end, the inverting input end and the output end. One end of the fifth capacitor C5 is connected to the power supply terminal of the amplifier U, and the other end of the fifth capacitor C5 is grounded.
The first capacitor C1 to the fifth capacitor C5 and the amplifier U determine the reliability of the signal conditioning circuit 14, filter out noise, and control hardware gain.
The processing circuit 15 is connected to the signal conditioning circuit 14 and is configured to identify the audio signal, detect the type of the audio device, and set a corresponding gain value for the conditioned signal based on the type of the audio device. Specifically, when the type of the audio device is a microphone input, the processing circuit 15 sets the gain value of the conditioned signal to a first preset gain value; when the type of the audio device is a linear input, the processing circuit 15 sets the gain value of the conditioned signal to a second preset gain value, which is smaller than the first preset gain value.
Further, the processing circuit 15 includes an audio codec circuit 151, and the audio codec circuit 151 is connected to the signal conditioning circuit 14, and is configured to decode the conditioned signal to obtain audio data, and set a corresponding gain according to the identified type of the audio device; it will be appreciated that the linear input device and the microphone input device may have different corresponding software gain values that may also be adjusted accordingly based on the hardware gain values provided by the signal conditioning circuit 14.
In order to detect the type of the input audio device, the present embodiment provides the following three implementations:
(1) the control circuit 12 controls the bias circuit 13 not to output the bias signal, that is, the control circuit 12 does not provide the control signal Vcon to the bias circuit 13, and the detection and identification are performed by using software, so that the method is suitable for a scene that the type of the audio device cannot be easily changed in the using process and the device needs to be restarted when the audio device is replaced.
The processing circuit 15 further includes a processor 152, the processor 152 is connected to the audio codec circuit 151, the processor 152 is configured to detect a bit number in the audio data, which is a preset value, and determine that the type of the audio device is linear input when the bit number is greater than a preset bit number threshold; when the digit is less than or equal to a preset digit threshold value, judging the type of the audio equipment as microphone input; specifically, the preset digit threshold value may be set empirically, the audio data is binary data, the preset value is 0, and the type of the accessed audio device may be identified according to the digit of the binary data of 0; for example, when the device is initialized after being installed, the data collected by the audio codec circuit 151 is determined, and since no bias signal is currently provided to provide a bias voltage, if the accessed device is a linear input device, the audio data collected by the audio codec circuit 151 is almost 0; if the majority of the audio data is not 0, the audio device is a passive pickup.
(2) The control circuit 12 controls the bias circuit 13 not to output the bias signal, and the processing circuit 15 further includes a sound source identification circuit 153, as shown in fig. 5, the sound source identification circuit 153 is connected to the signal conditioning circuit 14, the sound source identification circuit 153 is configured to detect a signal input to the signal conditioning circuit 14, generate a signal to be detected, convert the signal to be detected into a dc level signal, and determine that the type of the audio device is microphone input when the dc level signal is at a low level; when the direct current level signal is at a high level, judging the type of the audio equipment as linear input; further, the sound source identification circuit 153 includes an integration circuit (not shown), and the signal to be detected can be converted into a dc level signal through the integration circuit.
In order to detect the dc level signal, analog-to-digital sampling or switch detection may be utilized, and the following implementation schemes are specifically included:
A) the sound source identification circuit 153 includes an analog-to-digital converter (not shown) for performing analog-to-digital conversion on the dc level signal to generate a digital signal; when the digital signal is a preset value, the processor 152 determines that the type of the audio device is a microphone input; when the digital signal is not a preset value, the processor 152 determines that the type of the audio device is a linear input.
B) The sound source identification circuit 153 includes a first switch circuit 1531 and an eighth resistor R8, one end of the eighth resistor R8 receives a power supply signal Vcc, the other end of the eighth resistor R8 is connected to the input end of the first switch circuit 1531 and the processor 152, the enable end of the first switch circuit 1531 is connected to the other end of the sixth resistor R6, and the output end of the first switch circuit 1531 is grounded.
The first switch circuit 1531 is configured to receive the dc level signal, and when the dc level signal is at a low level, the first switch circuit 1531 is turned off, and the processor 152 determines that the type of the audio device is a microphone input; when the dc level signal is at a high level, the first switch circuit 1531 is in a conducting state, and the processor 152 determines that the type of the audio device is a linear input; when the dc level signal is at a low level, the first switching circuit 1531 is in an off state, and the processor 152 determines that the type of the audio device is a microphone input.
The embodiment mainly utilizes hardware to detect and identify, has higher reliability, can be suitable for scenes of changing the type of the audio equipment in the using process, can be combined with software control to adjust the audio gain value in real time, and does not need to restart the equipment when the audio equipment is replaced.
(3) The control circuit 12 controls the bias circuit 13 to output a bias signal, and detects a sound source signal at the rear stage of the signal conditioning circuit 14, because a dc blocking capacitor is generally disposed on an input link of an audio frequency, only an ac component is retained in a signal output by the signal conditioning circuit 14, that is, only an ac component is retained in a signal at the rear stage of the signal conditioning circuit 14, regardless of a passive sound pickup or a linear input device, while a signal amplitude corresponding to the passive sound pickup is very small, at a mV level, and a signal amplitude corresponding to the linear input device is at a V level, and a type of the audio device can be detected by using a detection method the same as that in the embodiment (2).
Further, the processor 152 is configured to detect an amplitude value of the conditioned signal, and determine that the type of the audio device is a microphone input when the amplitude value of the conditioned signal is smaller than a preset amplitude value; and when the amplitude value of the conditioning signal is larger than or equal to the preset amplitude value, judging the type of the audio equipment as linear input.
The present embodiment has an advantage that detection is performed at the subsequent stage of the signal conditioning circuit 14, and does not cause interference with the input sound source signal, and has the advantage of embodiment (2). It will be appreciated that, in addition to the three implementations described above, extensions may be made to the above three.
The embodiment can simultaneously protect the audio input interface and the bias circuit by using the protection circuit, thereby improving the working safety of the circuit; in addition, the interface type of the accessed audio equipment is identified by setting the control circuit and the audio identification circuit, and the gain values of different types of audio equipment can be adjusted by combining software, so that the automatic identification of the interface type and the self-adaptive adjustment of the gain value are realized.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of an adaptive audio device 100 provided in the present application, where the adaptive audio device 100 includes an adaptive audio circuit 10, and the adaptive audio circuit 10 is an adaptive audio circuit in the above embodiment.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. An adaptive audio circuit, comprising:
the audio input interface is used for receiving an audio signal input by the audio equipment;
a control circuit and a bias circuit connected to each other, the control circuit for generating a control signal to control the bias circuit to generate a bias signal based on a type of the audio device;
a signal conditioning circuit connected to the audio input interface, the bias circuit, and the control circuit for generating a conditioning signal based on at least one of the control signal, the audio signal, or the bias signal;
and the processing circuit is connected with the signal conditioning circuit and used for identifying the audio signal or the conditioning signal so as to detect the type of the audio equipment and set a corresponding gain value for the conditioning signal based on the type of the audio equipment.
2. The adaptive audio circuit of claim 1, wherein the processing circuit comprises:
the audio coding and decoding circuit is connected with the signal conditioning circuit and is used for decoding the conditioning signal to obtain audio data;
and the protection circuit is connected with the audio input interface and the bias circuit and used for protecting the audio input interface and the bias circuit.
3. The adaptive audio circuit of claim 2,
the control circuit controls the bias circuit not to output the bias signal, the processing circuit further comprises a processor, the processor is connected with the audio encoding and decoding circuit and used for detecting the number of bits which are a preset value in the audio data, when the number of bits is larger than a preset number of bits threshold value, the type of the audio equipment is judged to be linear input, and when the number of bits is smaller than or equal to the preset number of bits threshold value, the type of the audio equipment is judged to be microphone input.
4. The adaptive audio circuit of claim 2,
the control circuit controls the bias circuit not to output the bias signal, the processing circuit further comprises a sound source identification circuit, the sound source identification circuit is connected with the signal conditioning circuit and used for detecting the signal input to the signal conditioning circuit, generating a signal to be detected, converting the signal to be detected into a direct current level signal, judging the type of the audio equipment as microphone input when the direct current level signal is at a low level, and judging the type of the audio equipment as linear input when the direct current level signal is at a high level.
5. The adaptive audio circuit of claim 4,
the sound source identification circuit comprises an analog-to-digital converter, and the digital converter is used for performing analog-to-digital conversion on the direct current level signal to generate a digital signal; when the digital signal is a preset value, judging that the type of the audio equipment is microphone input, and when the digital signal is not the preset value, judging that the type of the audio equipment is linear input.
6. The adaptive audio circuit of claim 4,
the sound source identification circuit comprises a first switch circuit, the first switch circuit is used for receiving the direct current level signal, when the direct current level signal is at a low level, the first switch circuit is switched off, and the processor judges that the type of the audio equipment is microphone input; when the direct current level signal is at a high level, the first switch circuit is conducted, and the processor judges that the type of the audio equipment is linear input.
7. The adaptive audio circuit of claim 2,
the control circuit controls the bias circuit to output the bias signal, the processing circuit further comprises a processor, the processor is connected with the signal conditioning circuit and is used for detecting an amplitude value of the conditioned signal, and when the amplitude value of the conditioned signal is smaller than a preset amplitude value, the type of the audio equipment is determined as microphone input; and when the amplitude value of the conditioning signal is greater than or equal to the preset amplitude value, judging the type of the audio equipment to be linear input.
8. The adaptive audio circuit according to claim 3, 4, or 7,
when the type of the audio equipment is microphone input, the processing circuit sets the gain value of the conditioning signal to be a first preset gain value; when the type of the audio equipment is linear input, the processing circuit sets the gain value of the conditioning signal to a second preset gain value, wherein the first preset gain value is larger than the second preset gain value.
9. The adaptive audio circuit of claim 1,
the control circuit comprises a second switch circuit, the input end of the second switch circuit receives a power supply signal, the output end of the second switch circuit is connected with the bias circuit and the signal conditioning circuit, the enable end of the second switch circuit is connected with the processor to receive an enable signal output by the processor, and when the enable signal is at a high level, the second switch circuit is conducted to output the control signal.
10. An adaptive audio device comprising an adaptive audio circuit, the adaptive audio circuit being an adaptive audio circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110120385.5A CN112995850A (en) | 2021-01-28 | 2021-01-28 | Self-adaptive audio circuit and self-adaptive audio device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110120385.5A CN112995850A (en) | 2021-01-28 | 2021-01-28 | Self-adaptive audio circuit and self-adaptive audio device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112995850A true CN112995850A (en) | 2021-06-18 |
Family
ID=76345694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110120385.5A Pending CN112995850A (en) | 2021-01-28 | 2021-01-28 | Self-adaptive audio circuit and self-adaptive audio device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112995850A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113596699A (en) * | 2021-07-30 | 2021-11-02 | 浙江大华技术股份有限公司 | Audio input detection circuit and method |
| CN114302300A (en) * | 2021-12-31 | 2022-04-08 | 盈帜科技（常州）有限公司 | Audio input interface circuit and fire extinguishing system control center |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231495A (en) * | 2016-08-31 | 2016-12-14 | 浙江大华技术股份有限公司 | A kind of audio identification methods and device |
| CN108107357A (en) * | 2017-12-27 | 2018-06-01 | 金卡智能集团股份有限公司 | Switching signal detection circuit with self-diagnostic function |
| WO2020037280A1 (en) * | 2018-08-17 | 2020-02-20 | Dts, Inc. | Spatial audio signal decoder |
| CN111935572A (en) * | 2020-07-02 | 2020-11-13 | 浙江大华技术股份有限公司 | Audio signal adjusting circuit, method, electronic equipment and storage medium |
-
2021
- 2021-01-28 CN CN202110120385.5A patent/CN112995850A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231495A (en) * | 2016-08-31 | 2016-12-14 | 浙江大华技术股份有限公司 | A kind of audio identification methods and device |
| CN108107357A (en) * | 2017-12-27 | 2018-06-01 | 金卡智能集团股份有限公司 | Switching signal detection circuit with self-diagnostic function |
| WO2020037280A1 (en) * | 2018-08-17 | 2020-02-20 | Dts, Inc. | Spatial audio signal decoder |
| CN111935572A (en) * | 2020-07-02 | 2020-11-13 | 浙江大华技术股份有限公司 | Audio signal adjusting circuit, method, electronic equipment and storage medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113596699A (en) * | 2021-07-30 | 2021-11-02 | 浙江大华技术股份有限公司 | Audio input detection circuit and method |
| CN114302300A (en) * | 2021-12-31 | 2022-04-08 | 盈帜科技（常州）有限公司 | Audio input interface circuit and fire extinguishing system control center |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105101009B (en) | Audio jack detection circuit, system and method | |
| CN112995850A (en) | Self-adaptive audio circuit and self-adaptive audio device | |
| CN102404666A (en) | Audio jack detection and configuration | |
| US9307316B2 (en) | Electronic device and method for sensing headset type by audio signal | |
| JPH114197A (en) | Photoelectric cell having stabilized amplifier | |
| EP3703258A1 (en) | Headset | |
| KR920009223A (en) | Signal Processing System in Television Receiver | |
| GB2560053A (en) | Circuit for monitoring a socket | |
| CN111935572B (en) | Audio signal adjusting circuit, method, electronic equipment and storage medium | |
| CN110932712A (en) | Interface circuit of connector and electronic device | |
| CN107396273B (en) | Detection circuit of broadcast sound box and detection method and device thereof | |
| US11729566B2 (en) | Judging circuit for positive and negative terminals of mic of earphone and method thereof, and eletronic device | |
| CN111385711A (en) | Audio output circuit, audio playing method and audio playing equipment | |
| CN109218871B (en) | Earphone interface circuit, audio module and electronic equipment | |
| US7109778B2 (en) | DC-offset transient response cancel system | |
| US7734265B2 (en) | Audio muting circuit and audio muting method | |
| JP3795626B2 (en) | Receiver circuit | |
| CN111510824A (en) | Audio processing circuit, audio processing method, electronic device, and computer-readable storage medium | |
| CN112887876B (en) | Differential audio system supporting single-ended signal and control method | |
| CN113473315B (en) | Electronic device capable of improving output performance of earphone | |
| KR0122512B1 (en) | Idle-channel noise blocking circuit | |
| CN113596699B (en) | Audio input detection circuit and method | |
| CN211152199U (en) | Audio output volume control circuit and audio equipment | |
| US6681011B1 (en) | Method and modem circuit using a dither signal for determining connection status of a phone line | |
| CN114302300A (en) | Audio input interface circuit and fire extinguishing system control center |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210618 |