CN110209371B - Audio compatible circuit and video and audio equipment - Google Patents
Audio compatible circuit and video and audio equipment Download PDFInfo
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- CN110209371B CN110209371B CN201910407194.XA CN201910407194A CN110209371B CN 110209371 B CN110209371 B CN 110209371B CN 201910407194 A CN201910407194 A CN 201910407194A CN 110209371 B CN110209371 B CN 110209371B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
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Abstract
The invention discloses an audio compatible circuit and video and audio equipment, wherein the circuit comprises: the first audio interface is used for connecting the second audio interface; the control module is used for configuring the audio compatible circuit into a first audio circuit when the video signal input is detected; the detection module is connected between the first audio interface and the control module and is used for detecting whether the first audio interface has a second audio interface connected to the sound collector or not when the control module does not detect that video signals are input; the control module is also used for configuring the audio compatible circuit into a second audio circuit when the detection module detects that the first audio interface has a second audio interface accessed to the sound collector; the audio signal transmission module is used for transmitting the input first audio signal or the second audio signal to the control module after the control module configures the audio compatible circuit into the first audio circuit or the second audio circuit. The invention can reduce the volume of the video and audio equipment and reduce the hardware cost of the equipment.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an audio compatible circuit and video and audio equipment.
Background
Many video and audio equipment on the market can play audio signals input by a microphone and can also play audio signals in videos so as to meet various requirements of users. Generally, when receiving a video signal, it is necessary to transmit an image signal and an audio signal of the video signal separately to prevent interference between the signals.
In the prior art, to meet the requirement of playing multiple audio signals of a user, different audio circuits are usually configured for different audio signals in the video and audio equipment, and different receiving functions are configured for different audio circuits. For example, in video and audio equipment, an audio circuit is provided for receiving an audio signal in a VGA video signal to realize separate transmission of an image signal and an audio signal in the video signal, and an audio circuit is provided for receiving an audio signal inputted from a microphone.
However, the addition of a corresponding audio circuit for each audio signal by using the technical solutions provided in the prior art may result in an increase in the volume of the audio/video device, and the hardware cost of the audio/video device may also increase accordingly.
Disclosure of Invention
The invention aims to solve the technical problem of designing an audio circuit and video and audio equipment, which can reduce the volume of the video and audio equipment and reduce the hardware cost of the video and audio equipment.
In a first aspect, to solve the above technical problem, an embodiment of the present invention provides an audio compatible circuit, where the circuit includes:
the first audio interface is used for being connected with the second audio interface so as to receive the audio signal transmitted by the second audio interface;
a control module for configuring the audio compatible circuit as a first audio circuit for receiving a first audio signal of the video signals when it is detected that there is a video signal input;
the audio signal transmission module is connected between the first audio interface and the control module and used for transmitting a first audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit into the first audio circuit;
the detection module is connected between the first audio interface and the control module and is used for detecting whether the first audio interface has a second audio interface connected with the sound collector or not when the control module does not detect that video signals are input;
the control module is further configured to configure the audio compatible circuit as a second audio circuit for receiving the second audio signal when the detection module detects that the first audio interface has a second audio interface connected to the sound collector;
the audio signal transmission module is further configured to transmit a second audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit as the second audio circuit.
Further, the control module comprises a first processing channel and a second processing channel; the input end of the first processing channel and the input end of the second processing channel are respectively connected with the output end of the audio signal transmission module; wherein, the first and the second end of the pipe are connected with each other,
the first processing channel is used for processing the first audio signal;
the second processing channel is used for processing the second audio signal;
the control module is specifically configured to:
when video signal input is detected, configuring the input end of the first processing channel to be in an opening state, and configuring the input end of the second processing channel to be in a closing state, so as to configure the audio compatible circuit to be the first audio circuit;
when the detection module detects that the first audio interface has a second audio interface connected with a sound collector, the input end of the second processing channel is configured to be in an on state, and the input end of the first processing channel is configured to be in an off state, so that the audio compatible circuit is configured to be the second audio circuit.
Further, the audio signal transmission module comprises a first resistor, a second resistor, a third resistor and a fourth resistor; the input of the first processing channel comprises a first input of the first processing channel and a second input of the first processing channel; the output end of the audio signal transmission module comprises a first output end of the audio signal transmission module and a second output end of the audio signal transmission module,
a first end of the first resistor is connected with a second pin of the first audio interface, and a second end of the first resistor is connected with a first input end of the first processing channel; the second end of the first resistor is also connected with the input end of the second processing channel;
a first end of the second resistor is connected with a third pin of the first audio interface, and a second end of the second resistor is connected with a second input end of the first processing channel; the second end of the second resistor is also connected with the input end of the second processing channel;
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is grounded;
the second end of the first resistor is a first output end of the audio signal transmission module, and the second end of the second resistor is a second output end of the audio signal transmission module.
Further, the audio signal transmission module further comprises a first capacitor and a second capacitor; wherein the content of the first and second substances,
a first end of the first capacitor is connected with a second end of the first resistor, and a second end of the first capacitor is connected with a first input end of the first processing channel;
a first end of the second capacitor is connected with a second end of the second resistor, and a second end of the second capacitor is connected with a second input end of the first processing channel;
the second end of the first capacitor is a first output end of the audio signal transmission module, and the second end of the second capacitor is a second output end of the audio signal transmission module.
Further, the detection module comprises a direct current power supply, a fifth resistor, a sixth resistor and a triode; wherein the content of the first and second substances,
a first end of the fifth resistor is connected with a first pin of the first audio interface, and a second end of the fifth resistor is connected with a first end of the triode; when the first audio interface is not connected with the second audio interface, the first pin of the first audio interface is communicated with the second pin of the first audio interface;
a first end of the sixth resistor is connected with a first end of the fifth resistor, and a second end of the sixth resistor is connected with a second end of the triode;
the third end of the triode is connected with the detection end of the control module;
the direct current power supply is connected with the second end of the fifth resistor.
Further, the detection module further comprises a seventh resistor and an eighth resistor; wherein the content of the first and second substances,
the first end of the seventh resistor is connected with the third end of the triode, and the second end of the seventh resistor is grounded;
and the first end of the eighth resistor is connected with the third end of the triode, and the second end of the eighth resistor is connected with the detection end of the control module.
Further, the triode is a PNP type triode; the first end of triode is the projecting pole of PNP type triode, the second end of triode is the base of PNP type triode, the third end of triode is the collecting electrode of PNP type triode.
Further, the first audio signal is a VGA audio signal or a DVI audio signal.
Further, the first audio interface is an audio and video composite interface; the sound collector is a microphone or a recorder.
In a second aspect, to solve the same technical problem, an embodiment of the present invention further provides a video and audio device, where the video and audio device includes the audio compatible circuit and the video signal receiving module provided in any of the embodiments of the first aspect; the video signal receiving module comprises a video interface, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor; wherein the content of the first and second substances,
a first pin of the video interface is connected with a first end of the ninth resistor, and a second end of the ninth resistor is connected with a first video signal input end of the control module;
a second pin of the video interface is connected with a first end of the tenth resistor, and a second end of the tenth resistor is connected with a second video signal input end of the control module;
a first end of the eleventh resistor is connected with a second end of the ninth resistor, and a second end of the eleventh resistor is grounded;
and the first end of the twelfth resistor is connected with the second end of the tenth resistor, and the second end of the twelfth resistor is grounded.
The audio compatible circuit and the video and audio equipment can judge the audio signal required by the user by detecting the input condition of the video signal, and carry out function configuration on the audio compatible circuit through the control module, so that the first audio signal in the video signal can be processed by one audio compatible circuit, the second audio signal input by the sound collector can be transmitted and processed, different audio circuits do not need to be set for each audio signal, and the volume and the hardware cost of the video and audio equipment are reduced.
Drawings
Fig. 1 is a schematic structural diagram of a first preferred embodiment of an audio compatible circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second preferred embodiment of an audio compatible circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third preferred embodiment of an audio compatible circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an audio-video apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of 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 invention.
An embodiment of the present invention provides an audio compatible circuit, please refer to fig. 1, which is a schematic structural diagram of a first preferred embodiment of an audio compatible circuit according to an embodiment of the present invention; specifically, the circuit includes:
the first audio interface 1 is used for connecting a second audio interface to receive an audio signal transmitted by the second audio interface;
a control module 2, configured to configure the audio compatible circuit as a first audio circuit for receiving a first audio signal in the video signals when detecting that video signals are input;
an audio signal transmission module 3, connected between the first audio interface 1 and the control module 2, for transmitting a first audio signal input by the first audio interface 1 to the control module 2 after the control module 2 configures the audio compatible circuit as the first audio circuit;
the detection module 4 is connected between the first audio interface 1 and the control module 2, and is used for detecting whether the first audio interface 1 has a second audio interface connected to a sound collector when the control module 2 does not detect that a video signal is input;
the control module 2 is further configured to configure the audio compatible circuit as a second audio circuit for receiving the second audio signal when the detection module 4 detects that the first audio interface 1 has a second audio interface connected to a sound collector;
the audio signal transmission module 3 is further configured to transmit a second audio signal input by the first audio interface 1 to the control module 2 after the control module 2 configures the audio compatible circuit as the second audio circuit.
It should be noted that the second audio interface may be an audio interface in the sound collector or an audio interface of another device, and the detection module in the audio compatible circuit provided in the embodiment of the present invention only detects whether the first audio interface is connected to the second audio interface of the sound collector.
The video interface arranged in the video and audio equipment can only receive the image signal in the video signal, and an interface is required to be additionally arranged to transmit the accompanying sound signal in the video signal. The second audio signal is an audio signal input by a sound collector, for example, a microphone, a recorder, or some devices such as MP3 and a mobile phone which can collect sound, and after collecting the sound of the user, the second audio signal is converted into an audio signal, and is connected to the first audio interface through the second audio interface of the sound collector, so that the second audio signal is input to the audio and video device.
The video signal is input by a video interface of the video and audio equipment, and the control module can determine whether the video signal is input by detecting whether the video signal is input by the video interface.
Specifically, when the control module detects that a video signal is input, it indicates that the first audio interface needs to transmit a first audio signal to the video and audio device; at this time, the control module needs to configure the function of the audio compatible circuit, configure the audio compatible circuit as a first audio circuit for receiving a first audio signal in the video signal, and the configured audio compatible circuit can only perform transmission processing on the first audio signal. If the first audio interface receives the audio signal, the control module can not process the wrong audio signal due to the function limitation of the audio compatible circuit; for example, if the user accesses the second audio interface of the microphone to the first audio interface, and the audio compatible circuit is configured, the audio compatible circuit cannot process the second audio signal input by the microphone. If the first audio interface receives the first audio signal, the first audio signal can be transmitted to the control module through the audio signal transmission module, so that the control module processes the first audio signal; for example, after the audio compatible circuit is configured, the user accesses the second audio interface of the VGA audio line to the first audio interface, and the accompanying audio signal of the VGA video signal can be transmitted to the control module through the audio signal transmission module, so that the control module processes the first audio signal input by the VGA audio line.
When the control module does not detect that a video signal is input, the control module indicates that the first audio signal processing requirement of the video signal does not exist, and at the moment, the detection module detects the connection state of a second audio interface for transmitting a second audio signal so as to determine whether the second audio signal needs to be processed or not; when the detection module detects that the first audio interface is connected with the second audio interface of the sound collector, the control module configures the function of the audio compatible circuit, and configures the audio compatible circuit as a second audio circuit for receiving a second audio signal input by the sound collector; and the configured audio compatible circuit can only carry out transmission processing on the second audio signal. When the second audio interface of the sound collector inputs a second audio signal to the audio compatible circuit, the second audio signal can be transmitted to the control module through the audio signal transmission module, and the control module processes the second audio signal. For example, after the user accesses the second audio interface of the microphone to the first audio interface, the detection module detects that the first audio interface is accessed to the second audio interface of the sound collector, the control module configures the audio compatible circuit into a second audio circuit, and the second audio signal can be transmitted to the control module through the audio signal transmission module.
It should be noted that, when the audio compatible circuit does not receive the required audio signal, for the video and audio device without the reminding function, the user may find whether there is the required first audio signal or the second audio signal to be output when using, so as to autonomously determine whether the second audio interface is accessed incorrectly, and provide the incorrect audio signal, and if the user finds the second audio interface that is accessed incorrectly, the user may replace the second audio interface. For the video and audio equipment with the reminding function, the video and audio equipment reminds the user whether the input audio signal is correct or not, and the user can replace the second audio interface accessed to the first audio signal.
Optionally, the control module performs function configuration on the audio compatible circuit, and may be configured that the control module does not process an erroneous audio signal, or configured that the erroneous audio signal cannot be transmitted to the control module, so as to implement the function configuration of the audio compatible circuit.
The audio compatible circuit provided by the embodiment of the invention can judge the audio signal required by a user by detecting the input condition of the video signal, and the control module is used for carrying out functional configuration on the audio compatible circuit, so that the audio compatible circuit can process a first audio signal in the video signal and transmit a second audio signal input by the sound collector, and different audio circuits do not need to be arranged for each audio signal, thereby reducing the volume and hardware cost of the audio and video equipment. For example, the user does not need the television to process and play the accompanying audio signal of the video signal input by the computer and the audio frequency of the microphone connected to the television at the same time, so that the audio compatible circuit provided by the embodiment of the invention reduces the number of the audio circuit, but does not affect the normal use of the user.
Preferably, please refer to fig. 2, which is a schematic structural diagram of a second preferred embodiment of an audio compatible circuit according to an embodiment of the present invention; specifically, the control module 2 comprises a first processing channel 5 and a second processing channel 6; the input end of the first processing channel 5 and the input end of the second processing channel 6 are respectively connected with the output end of the audio signal transmission module 3; wherein the content of the first and second substances,
the first processing channel 5 is configured to process the first audio signal;
the second processing channel 6 is configured to process the second audio signal;
the control module 2 is specifically configured to:
when detecting that a video signal is input, configuring the input terminal of the first processing channel 5 to be in an on state, and configuring the input terminal of the second processing channel 6 to be in an off state, so as to configure the audio compatible circuit as the first audio circuit;
when the detection module 4 detects that the first audio interface 1 has a second audio interface connected to a sound collector, the input end of the second processing channel 6 is configured to be in an on state, and the input end of the first processing channel 5 is configured to be in an off state, so as to configure the audio compatible circuit as the second audio circuit.
In the audio compatible circuit provided by the embodiment of the invention, the control module can realize the functional configuration of the audio compatible circuit by preventing the wrong audio signal from being input into the corresponding processing channel and only allowing the correct audio signal to be input into the correct processing channel. Specifically, when it is detected that a video signal is input, the input end of the first processing channel is configured to be in an on state, and the input end of the second processing channel is configured to be in an off state, so that the first audio signal can be input into the first processing channel through the audio signal transmission module, the second audio signal cannot be input into the second processing channel, and the second audio signal cannot be processed by the first processing channel, so that the audio compatible circuit is configured as a first audio circuit; when the control module does not detect the video signal, the detection module accesses the first audio interface to determine whether a second audio interface of the sound collector exists; when the detection module detects that the first audio interface has a second audio interface connected with the sound collector, the control module configures the input end of the second processing channel into an open state and configures the input end of the first processing channel into a closed state, so that the first audio signal cannot be input into the first processing channel and cannot be processed in the second processing channel, and the second audio signal can be transmitted to the second processing channel through the audio signal transmission module for processing, so that the audio compatible circuit is configured into a second audio circuit.
It should be noted that, the specific number of pins included in each of the input end of the first processing channel and the input end of the second processing channel in the control module may be set according to an actual situation, that is, each of the input end of the first processing channel and the input end of the second processing channel may be formed by one or more pins, as long as the control module is applicable to transmission and reception processing of the first audio signal and the second audio signal. Optionally, the input end of the first processing channel is formed by 2 input pins, namely a left channel pin and a right channel pin; the input of the second processing channel is formed by an input pin.
The setting of the on-state and the off-state of the input end of the first processing channel and the input end of the second processing channel in the control module can be specifically set according to the actual application condition. Optionally, the input end of the first processing channel is in a high impedance state when the input end of the first processing channel is closed, and the input end of the second processing channel is in a high impedance state when the input end of the second processing channel is closed; if switches are arranged between the input end of the first processing channel, the input end of the second processing channel and the processing module in the control module, the closed state of the input end of the first processing channel and the input end of the second processing channel can be that the switches are in an off state.
According to the audio compatible circuit provided by the embodiment of the invention, the functional configuration of the audio compatible circuit can be realized only by controlling the on-state and the off-state of the input end of the first processing channel and the input end of the second processing channel through the control module, the corresponding functional configuration can be realized without complicated steps of detecting, judging and analyzing the type of the input audio signal and the like, and the research and development period of the audio compatible circuit is shortened.
Preferably, please refer to fig. 3, which is a schematic structural diagram of a third preferred embodiment of an audio compatible circuit according to an embodiment of the present invention; specifically, the audio signal transmission module 3 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the inputs of the first processing channel 5 comprise a first input IC1_ R of the first processing channel 5 and a second input IC1_ L of the first processing channel; the output end of the audio signal transmission module 3 comprises a first output end line _ R of the audio signal transmission module and a second output end line _ L of the audio signal transmission module; wherein, the first and the second end of the pipe are connected with each other,
a first end of the first resistor R1 is connected with the second pin P2 of the first audio interface 1, and a second end of the first resistor R1 is connected with the first input IC1_ R of the first processing channel 5; the second end of the first resistor R1 is also connected with the input IC2 of the second processing channel 6;
a first end of the second resistor R2 is connected to the third pin P3 of the first audio interface 1, and a second end of the second resistor R2 is connected to the second input IC1_ L of the first processing channel 5; the second end of the second resistor R2 is further connected to the input IC2 of the second processing channel 6;
the first end of the third resistor R3 is connected with the second end of the first resistor R1, and the second end of the third resistor R3 is grounded; a first end of the fourth resistor R4 is connected with a second end of the second resistor R2, and a second end of the fourth resistor R4 is grounded;
a second end of the first resistor R1 is a first output terminal LINEIN _ R of the audio signal transmission module 3, and a second end of the second resistor R2 is a second output terminal LINEIN _ L of the audio signal transmission module 3.
It should be noted that the first processing channel includes a first input IC1_ R and a second input IC1_ L, which are respectively connected to the first output terminal LINEIN _ R and the second output terminal LINEIN _ L of the audio signal transmission module, and can separately transmit the left channel audio signal and the right channel audio signal of the first audio signal to the first processing channel for processing; and the first output terminal LINEIN _ R and the second output terminal LINEIN _ L of the audio signal transmission module are both combined with the input terminal IC2 of the second processing channel, and the combined second audio signal is input into the second processing channel for processing.
Specifically, the audio compatible circuit provided in the embodiment of the present invention implements impedance matching between the input end and the output end of the audio signal transmission module through the first resistor, the second resistor, the third resistor, and the fourth resistor, reduces loss of the audio signal in the transmission process, and better transmits the audio signal to the control module.
Preferably, the audio signal transmission module 3 further includes a first capacitor C1 and a second capacitor C2; wherein, the first and the second end of the pipe are connected with each other,
a first terminal of the first capacitor C1 is connected to a second terminal of the first resistor R1, and a second terminal of the first capacitor C1 is connected to a first input terminal IC1_ R of the first processing channel 5;
a first terminal of the second capacitor C2 is connected to a second terminal of the second resistor R2, and a second terminal of the second capacitor C2 is connected to a second input terminal IC1_ L of the first processing channel 5;
a second end of the first capacitor C1 is a first output terminal LINEIN _ R of the audio signal transmission module 3, and a second end of the second capacitor C2 is a second output terminal LINEIN _ L of the audio signal transmission module 3.
Specifically, in the audio compatible circuit provided in the embodiment of the present invention, the second end of the first resistor is connected to the first input end of the first processing channel through the first capacitor, and the second end of the second resistor is connected to the second input end of the first processing channel through the second capacitor, so that the dc signal input to the audio signal transmission module is filtered through the first capacitor and the second capacitor, and the dc signal is prevented from interfering with the processing and analysis of the audio signal by the control module.
Preferably, the detection module 4 includes a dc power VCC, a fifth resistor R5, a sixth resistor R6, and a transistor Q1; wherein the content of the first and second substances,
a first end of the fifth resistor R5 is connected to the first pin P1 of the first audio interface 1, and a second end of the fifth resistor R5 is connected to the first end of the transistor Q1; when the first audio interface 1 is not connected with the second audio interface, the first pin P1 of the first audio interface 1 is communicated with the second pin P2 of the first audio interface 1;
a first end of the sixth resistor R6 is connected to a first end of the fifth resistor R5, and a second end of the sixth resistor R6 is connected to a second end of the transistor Q1;
the third end of the triode Q1 is connected with the detection end of the control module 2;
and the direct current power supply VCC is connected with the second end of the fifth resistor R5.
It should be noted that the first pin of the first audio interface is provided with a metal elastic sheet, when the second audio interface of the sound collector is not connected to the first audio interface, the metal elastic sheet arranged on the first pin P1 is in contact with the second pin P2, at this time, the first pin P1 is communicated with the second pin P2, and the direct-current power supply VCC, the fifth resistor R5, the first resistor R1 and the third resistor R3 are communicated. When the second audio interface of the sound collector is connected to the first audio interface, the second audio interface causes the metal elastic sheet arranged on the first pin P1 of the first audio interface to be ejected from the second pin P2, that is, the second audio interface disconnects the first pin P1 and the second pin P2 of the first audio interface, at this time, the second pin P2 is used for receiving a second audio signal, and the second audio signal received by the second pin P2 is transmitted to the control module through the audio signal transmission module.
Specifically, when the control module does not detect that a video signal is input, if a second audio interface of the sound collector is not connected to the first audio interface, the first pin of the first audio interface is communicated with the second pin, the fifth resistor, the first resistor and the third resistor form partial pressure, the triode is conducted, the third terminal of the triode inputs a high level to the detection end of the control module, and at the moment, the control module learns that the second audio interface of the sound collector is not connected to the first audio interface. If the second audio interface of the sound collector is connected with the first audio interface, the first pin and the second pin of the first audio interface are disconnected at the moment, the first end and the second end of the triode are both high level, the triode is stopped, the detection end of the control module has low level input, at the moment, the control module knows that the second audio interface of the sound collector is connected, and the audio compatible circuit needs to be configured into a second audio circuit.
In the audio compatible circuit provided by the embodiment of the invention, whether the second audio interface of the sound collector is inserted into the first audio interface is detected through the direct-current power supply, the fifth resistor, the sixth resistor and the triode so as to determine whether a second audio signal needs to be received and processed, and when the fact that the second audio interface of the sound collector is connected into the first audio interface is detected, the control module configures the audio compatible circuit into the second audio circuit.
Preferably, the detection module 4 further comprises a seventh resistor R7 and an eighth resistor R8; wherein the content of the first and second substances,
a first end of the seventh resistor R7 is connected to the third end of the transistor Q1, and a second end of the seventh resistor R7 is grounded;
a first end of the eighth resistor R8 is connected to the third end of the transistor Q1, and a second end of the eighth resistor R8 is connected to the detection end of the control module 2.
Specifically, the audio compatible circuit provided in the embodiment of the present invention performs level matching through the seventh resistor and the eighth resistor.
Preferably, the transistor Q1 is a PNP type transistor; the first end of the triode Q1 is the emitting electrode of the PNP type triode, the second end of the triode Q1 is the base electrode of the PNP type triode, and the third end of the triode Q1 is the collecting electrode of the PNP type triode.
Specifically, the triode provided by the embodiment of the present invention is a PNP type triode, so that the conduction state of the triode is controlled by the voltages of the first end and the second end of the triode.
Preferably, the first audio signal is a VGA audio signal or a DVI audio signal.
Specifically, the first audio signal is a VGA audio signal or a DVI audio signal, which can meet the signal requirements of most video and audio devices, such as TV devices or display devices, and has a wide adaptability.
Preferably, the first audio interface 1 is an audio/video composite interface; the sound collector is a microphone or a recorder.
It should be noted that the audio/video composite interface is an interface capable of transmitting both audio signals and video signals, and is also called as an av (audio video) interface or an rca (radio Corporation of american) interface. Correspondingly, the second audio interface is an earphone plug, and a three-section type or four-section type earphone plug can be adopted.
According to the audio compatible circuit provided by the embodiment of the invention, the first audio interface is an audio and video composite interface, the sound collector is a microphone or a recorder, and the audio compatible circuit can support a second audio signal input by the microphone or the recorder, is suitable for function setting of most video and audio equipment and has wide adaptability.
It should be noted that, as shown in fig. 3, the first audio interface 1 is further provided with a fourth pin P4, a fifth pin P5, and a sixth pin P6; the fourth pin P4 and the fifth pin P5 are both grounded; the sixth pin P6 is floating.
In specific implementation, the audio compatible circuit provided by the embodiment of the invention comprises a first audio interface, a control module, an audio signal transmission module and a detection module; the first audio interface is used for connecting the second audio interface to receive the audio signal transmitted by the second audio interface; the control module is used for configuring the audio compatible circuit into a first audio circuit for receiving a first audio signal in the video signals when the video signals are detected to be input; the audio signal transmission module is connected between the first audio interface and the control module and used for transmitting a first audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit into a first audio circuit; the detection module is connected between the first audio interface and the control module and is used for detecting whether the first audio interface has a second audio interface connected to the sound collector or not when the control module does not detect that video signals are input; the control module is also used for configuring the audio compatible circuit into a second audio circuit for receiving a second audio signal when the detection module detects that the first audio interface has a second audio interface accessed to the sound collector; the audio signal transmission module is further used for transmitting a second audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit into a second audio circuit.
The audio compatible circuit provided by the embodiment of the invention can judge the audio signal required by a user by detecting the input condition of the video signal, and the control module is used for carrying out function configuration on the audio compatible circuit, so that the first audio signal in the video signal can be processed and the second audio signal input by the sound collector can be transmitted and processed by one audio compatible circuit, and different audio circuits do not need to be arranged for each audio signal, thereby reducing the volume and hardware cost of video and audio equipment. For example, the user does not need the television to process and play the accompanying audio signal of the video signal input by the computer and the audio frequency of the microphone connected to the television at the same time, so that the audio compatible circuit provided by the embodiment of the invention reduces the number of the audio circuit, but does not affect the normal use of the user.
Fig. 4 is a schematic structural diagram of a video and audio device according to an embodiment of the present invention; specifically, the video/audio device includes the audio compatible circuit and the video signal receiving module 7 provided in any one of the above embodiments; the video signal receiving module 7 comprises a video interface 8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12; wherein, the first and the second end of the pipe are connected with each other,
a first pin of the video interface 8 is connected to a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is connected to a first video signal input end of the control module 2;
a second pin of the video interface 8 is connected to a first terminal of the tenth resistor R10, and a second terminal of the tenth resistor R10 is connected to a second video signal input terminal of the control module 2;
a first end of the eleventh resistor R11 is connected with a second end of the ninth resistor R9, and a second end of the eleventh resistor R11 is grounded;
a first end of the twelfth resistor R12 is connected to a second end of the tenth resistor R10, and a second end of the twelfth resistor R12 is grounded.
Specifically, for the video signal receiving module, the video and audio device determines whether a video signal is input by detecting whether the video signal is input through the video interface, and performs impedance matching on the video signal through the ninth resistor, the tenth resistor, the eleventh resistor and the twelfth resistor, so as to reduce loss of the video signal in the transmission process and enable the video signal to be transmitted to the control module more completely.
When the control module detects that a video signal is input, it is indicated that the first audio interface needs to transmit a first audio signal to the video and audio equipment; at this time, the control module needs to configure the function of the audio compatible circuit, configure the audio compatible circuit as a first audio circuit for receiving a first audio signal in the video signal, and the configured audio compatible circuit can only perform transmission processing on the first audio signal. If the first audio interface receives the audio signal, the control module cannot process the wrong audio signal due to the function limitation of the audio compatible circuit. If the first audio interface receives the first audio signal, the first audio signal can be transmitted to the control module through the audio signal transmission module, so that the control module processes the first audio signal.
When the control module does not detect that a video signal is input, the control module indicates that the first audio signal processing requirement of the video signal does not exist, and at the moment, the detection module detects the connection state of a second audio interface for transmitting a second audio signal so as to determine whether the second audio signal needs to be processed or not; when the detection module detects that the first audio interface is connected with the second audio interface of the sound collector, the control module configures the function of the audio compatible circuit, and configures the audio compatible circuit as a second audio circuit for receiving a second audio signal input by the sound collector; and the configured audio compatible circuit can only transmit and process the second audio signal. When the second audio interface of the sound collector inputs a second audio signal to the audio compatible circuit, the second audio signal can be transmitted to the control module through the audio signal transmission module, and the control module processes the second audio signal.
It should be noted that, for the specific working principle of the audio compatible circuit included in the video and audio device provided by the embodiment of the present invention, reference may be made to the working principle of the audio compatible circuit provided by the above embodiment, and therefore, no further description is given here.
Optionally, the video and audio device in the embodiment of the present invention may be a television, a display, or the like.
It should be noted that, in the drawings of the embodiments of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An audio compatible circuit, the circuit comprising:
the first audio interface is used for being connected with the second audio interface so as to receive the audio signal transmitted by the second audio interface;
the control module is used for configuring the audio compatible circuit into a first audio circuit for receiving a first audio signal in the video signals when the video signals are detected to be input;
the audio signal transmission module is connected between the first audio interface and the control module and used for transmitting a first audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit into the first audio circuit;
the detection module is connected between the first audio interface and the control module and is used for detecting whether the first audio interface has a second audio interface connected with the sound collector or not when the control module does not detect that video signals are input;
the control module is further used for configuring the audio compatible circuit into a second audio circuit for receiving a second audio signal when the detection module detects that the first audio interface has a second audio interface connected to the sound collector;
the audio signal transmission module is further used for transmitting a second audio signal input by the first audio interface to the control module after the control module configures the audio compatible circuit into the second audio circuit;
the detection module comprises a direct-current power supply, a fifth resistor, a sixth resistor and a triode; wherein, the first and the second end of the pipe are connected with each other,
a first end of the fifth resistor is connected with a first pin of the first audio interface, and a second end of the fifth resistor is connected with a first end of the triode; when the first audio interface is not connected with the second audio interface, the first pin of the first audio interface is communicated with the second pin of the first audio interface;
a first end of the sixth resistor is connected with a first end of the fifth resistor, and a second end of the sixth resistor is connected with a second end of the triode;
the third end of the triode is connected with the detection end of the control module;
the direct current power supply is connected with the second end of the fifth resistor.
2. The audio compatibility circuit of claim 1, wherein said control module comprises a first processing channel and a second processing channel; the input end of the first processing channel and the input end of the second processing channel are respectively connected with the output end of the audio signal transmission module; wherein the content of the first and second substances,
the first processing channel is used for processing the first audio signal;
the second processing channel is used for processing the second audio signal;
the control module is specifically configured to:
when video signal input is detected, configuring the input end of the first processing channel to be in an opening state, and configuring the input end of the second processing channel to be in a closing state, so as to configure the audio compatible circuit to be the first audio circuit;
when the detection module detects that the first audio interface has a second audio interface connected with a sound collector, the input end of the second processing channel is configured to be in an on state, and the input end of the first processing channel is configured to be in an off state, so that the audio compatible circuit is configured to be the second audio circuit.
3. The audio compatible circuit of claim 2 wherein the audio signal transmission module comprises a first resistor, a second resistor, a third resistor, and a fourth resistor; the input of the first processing channel comprises a first input of the first processing channel and a second input of the first processing channel; the output end of the audio signal transmission module comprises a first output end of the audio signal transmission module and a second output end of the audio signal transmission module,
a first end of the first resistor is connected with a second pin of the first audio interface, and a second end of the first resistor is connected with a first input end of the first processing channel; the second end of the first resistor is also connected with the input end of the second processing channel;
a first end of the second resistor is connected with a third pin of the first audio interface, and a second end of the second resistor is connected with a second input end of the first processing channel; the second end of the second resistor is also connected with the input end of the second processing channel;
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is grounded;
the second end of the first resistor is a first output end of the audio signal transmission module, and the second end of the second resistor is a second output end of the audio signal transmission module.
4. The audio compatible circuit of claim 3 wherein the audio signal transmission module further comprises a first capacitor and a second capacitor; wherein the content of the first and second substances,
a first end of the first capacitor is connected with a second end of the first resistor, and a second end of the first capacitor is connected with a first input end of the first processing channel;
a first end of the second capacitor is connected with a second end of the second resistor, and a second end of the second capacitor is connected with a second input end of the first processing channel;
the second end of the first capacitor is a first output end of the audio signal transmission module, and the second end of the second capacitor is a second output end of the audio signal transmission module.
5. The audio compatible circuit of claim 1 wherein the detection module further comprises a seventh resistor and an eighth resistor; wherein the content of the first and second substances,
the first end of the seventh resistor is connected with the third end of the triode, and the second end of the seventh resistor is grounded;
and the first end of the eighth resistor is connected with the third end of the triode, and the second end of the eighth resistor is connected with the detection end of the control module.
6. The audio compatible circuit of claim 1 wherein the transistor is a PNP type transistor; the first end of the triode is the emitting electrode of the PNP type triode, the second end of the triode is the base electrode of the PNP type triode, and the third end of the triode is the collecting electrode of the PNP type triode.
7. The audio compatibility circuit according to any one of claims 1 to 6, wherein said first audio signal is a VGA audio signal or a DVI audio signal.
8. The audio compatibility circuit according to any of claims 1 to 6, wherein said first audio interface is an audio-video composite interface; the sound collector is a microphone or a recorder.
9. A video and audio apparatus, characterized in that the video and audio apparatus comprises the audio compatible circuit of any one of claims 1 to 8 and a video signal receiving module; the video signal receiving module comprises a video interface, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor; wherein the content of the first and second substances,
a first pin of the video interface is connected with a first end of the ninth resistor, and a second end of the ninth resistor is connected with a first video signal input end of the control module;
a second pin of the video interface is connected with a first end of the tenth resistor, and a second end of the tenth resistor is connected with a second video signal input end of the control module;
a first end of the eleventh resistor is connected with a second end of the ninth resistor, and a second end of the eleventh resistor is grounded;
and the first end of the twelfth resistor is connected with the second end of the tenth resistor, and the second end of the twelfth resistor is grounded.
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