CN208061187U - Audio input fault detection circuit and program request apparatus - Google Patents
Audio input fault detection circuit and program request apparatus Download PDFInfo
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- CN208061187U CN208061187U CN201820343786.0U CN201820343786U CN208061187U CN 208061187 U CN208061187 U CN 208061187U CN 201820343786 U CN201820343786 U CN 201820343786U CN 208061187 U CN208061187 U CN 208061187U
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Abstract
The utility model provides a kind of audio input fault detection circuit and program request apparatus, audio input fault detection circuit includes the selected on-off circuit for gating analog test signal or microphone signal, analog to digital conversion circuit for converting analog signals into digital signal, the processor for handling the digital signal；The input terminal of analog-digital conversion circuit as described is connect with the output end of the selected on-off circuit, and the output end of analog-digital conversion circuit as described is connect with the input terminal of the processor；The selected on-off circuit includes the digital control analog switch of multi input, and the analog test signal and microphone signal are connect with the input terminal of the digital control analog switch of the multi input respectively.The utility model eliminates patrolman and checks whether the audio input of every equipment normally bothers one by one, it is easier to detect naked eyes failure hard to find.
Description
Technical field
The utility model is related to electronic circuit technology, especially a kind of audio input fault detection circuit and program request apparatus.
Background technology
Program request apparatus currently on the market is the highest component of program request apparatus failure rate since microphone frequency of usage is very high
One of, cause inconvenience to user；Especially self-service program request apparatus, when microphone damages, is used due to unattended
Family will be unable to request tune and lead to the wasting of resources.In order to check that the failure of the components such as microphone, equipment are launched quotient and need to generally be arranged greatly
Amount personnel carry out scene inspection, and this test mode takes more, high labor cost；Moreover, microphone can not normal use when, only
With determining fault point is visually difficult to, needs professional that can just detect, cannot be excluded in time so as to cause microphone failure, shadow
The business revenue of the recreation experience and equipment dispensing quotient of program request customer is rung.
Utility model content
The purpose of this utility model aims to solve at least one of above-mentioned technological deficiency, especially detects whether microphone has event
The problem of barrier.
The utility model provides a kind of audio input fault detection circuit, including：For gate analog test signal or
The selected on-off circuit of microphone signal, the analog to digital conversion circuit for converting analog signals into digital signal, for handling
The processor of the digital signal；The input terminal of analog-digital conversion circuit as described is connect with the output end of the selected on-off circuit,
The output end of analog-digital conversion circuit as described is connect with the input terminal of the processor；The selected on-off circuit includes multi input number
Word controls analog switch, the analog test signal and microphone signal respectively with the digital control analog switch of the multi input
Input terminal connects.
Preferably, the selected on-off circuit further includes amplifying circuit, the input terminal of the amplifying circuit with it is described how defeated
Enter the output end connection of digital control analog switch, the output end of the amplifying circuit and the input terminal of analog-digital conversion circuit as described
Connection.
Preferably, the selected on-off circuit further includes filter circuit, the digital control analog switch of multi input it is defeated
Outlet is connect by the filter circuit with the input terminal of the amplifying circuit.
Preferably, the digital control analog switch of the multi input includes the first output end and second output terminal, the filtering
Circuit includes capacitance C1, capacitance C2, capacitance C3, resistance R1, resistance R2；The capacitance C1 first ends and the multi input number control
The first output end of analog switch processed connection, second end are connect with the capacitance C2 first ends, the capacitance C2 second ends with it is described
The digital control analog switch second output terminal connection of multi input；The resistance R1 first ends are connect with the capacitance C1 first ends,
The resistance R1 second ends are connect with the first end of the resistance R2 and the capacitance C1 second ends, the resistance R2 second ends with
The digital control analog switch second output terminal connection of multi input；The capacitance C1 second ends are grounded by the capacitance C3；
The filter circuit is also parallel with resistance R3, and the resistance R3 first ends and the digital control analog switch first of the multi input are defeated
Outlet connects, and the resistance R3 second ends are connect with the digital control analog switch second output terminal of the multi input.
Preferably, the amplifying circuit includes analogue amplifier PGA2505 and input protection sub-circuit, the multi input number
The output end that word controls analog switch protects sub-circuit to access the analogue amplifier by the filter circuit and the input
Two analog signal input pins of PGA2505.
Preferably, the selected on-off circuit further includes signal attenuation circuit, and the analog test signal passes through the letter
Number attenuator circuit is connect with the input terminal of the digital control analog switch of the multi input.
Preferably, the digital control analog switch of the multi input is digital control analog switch CD4053, the number control
The non-moving end of first group of single-pole double-throw switch (SPDT) is separately connected the first end of the analog test signal in analog switch CD4053 processed
With the first end of the microphone signal, second group of single-pole double-throw switch (SPDT) is motionless in the digital control analog switch CD4053
End is separately connected the second end of the second end and the microphone signal of the analog test signal；The digital control simulation is opened
The moved end for closing first group of single-pole double-throw switch (SPDT) of CD4053 connects the amplifying circuit with the moved end of second group of single-pole double-throw switch (SPDT)
Input terminal.
Preferably, the selected on-off circuit includes the first output end and second output terminal, analog-digital conversion circuit as described packet
Include modulus conversion chip CS5381, input filter sub-circuit and operating point setting sub-circuit；
The input filter sub-circuit includes the first amplifier OPA2134, the second amplifier OPA2134, capacitance C28, electricity
Hold C29, capacitance C30, resistance R12, resistance R13, resistance R14, resistance R15；The homophase input of the first amplifier OPA2134
End is connect with the first output end of the selected on-off circuit, inverting input and the electricity of the first amplifier OPA2134
The connection of R12 first ends is hindered, the resistance R12 second ends are connect with the output end of the first amplifier OPA2134, the resistance
R14 first ends are connect with the output end of the first amplifier OPA2134, and the resistance R14 second ends access the modulus and turn
Change the first input pins of chip CS5381；The in-phase input end of the second amplifier OPA2134 and the selected on-off circuit
Second output terminal connects, and the inverting input of the second amplifier OPA2134 is connect with the resistance R13 first ends, described
Resistance R13 second ends are connect with the output end of the second amplifier OPA2134, the resistance R15 first ends and described second
The output end of amplifier OPA2134 connects, and the resistance R15 second ends access the modulus conversion chip CS5381 second and input
Pin；The first end of the capacitance C30 connects the second end of the resistance R14, and the second end of the capacitance C30 connects the electricity
Hinder the second end of R15；
The operating point setting sub-circuit includes resistance R10 and resistance R11, the resistance R10 first ends and described first
The in-phase input end of amplifier OPA2134 connects, and the resistance R10 second ends are connect with the resistance R11 first ends, the electricity
Resistance R11 second ends are connect with the in-phase input end of the second amplifier OPA2134, described in the resistance R10 second ends access
The static reference voltage VQ pins of modulus conversion chip CS5381.
Preferably, the selected on-off circuit further includes amplifying circuit, and the microphone signal passes through the amplifying circuit
Access the input terminal of the digital control analog switch of the multi input.
The utility model also proposes a kind of program request apparatus comprising aforementioned any one of them audio input fault detect electricity
Road.
The beneficial effects of the utility model are as follows：
1, when the audio input fault detection circuit of the utility model gates the microphone signal, it can be used as normal wheat
Gram wind signal processing circuit；Also the analog test signal can be first gated by the digital control analog switch of the multi input, with
It tests analog-digital conversion circuit as described and whether the selected on-off circuit is normal, then gate the microphone signal, to test
Whether normal state microphone signal；Therefore the audio input fault detection circuit of the utility model can not only be used for the signal of microphone
Processing circuit, can also be achieved the fault detect of signal processing circuit or microphone, not only eliminates patrolman and checks one by one often
Whether the audio input of platform equipment normally bothers, and naked eyes failure hard to find is also more readily detected out.
2, the utility model can receive the audio signal within the scope of relatively high power, to realize by the amplifying circuit
Processing to the audio signal of different capacity；But also the interference of anomalous audio signal can be excluded by the filter circuit；This
The circuit structure of utility model is simple, moreover, external digital signal processing chip can also call the utility model audio input
The detection signal of fault detection circuit, with realize fault point it is automatic report and functions such as distribution maintenance personal automatically, it is expansible
Function is more, has great market and economic value.
The additional aspect of the utility model and advantage will be set forth in part in the description, these will be from following description
In become apparent, or recognized by the practice of the utility model.
Description of the drawings
The utility model is above-mentioned and/or additional aspect and advantage from the following description of the accompanying drawings of embodiments will
Become apparent and is readily appreciated that, wherein：
Fig. 1 is the circuit block diagram of the utility model audio input fault detection circuit first embodiment；
Fig. 2 is the circuit block diagram of the utility model audio input fault detection circuit second embodiment；
Fig. 3 is the circuit block diagram of the utility model audio input fault detection circuit 3rd embodiment；
Fig. 4 is the circuit diagram of the preferred embodiment of filter circuit described in the utility model；
Fig. 5 is the circuit diagram of the preferred embodiment of filter circuit described in the utility model；
Fig. 6 is the circuit diagram of the preferred embodiment of filter circuit described in the utility model；
Fig. 7 is the circuit diagram of the preferred embodiment of filter circuit described in the utility model.
Specific implementation mode
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and cannot be construed to the utility model
Limitation.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges
It refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition to take leave " comprising "
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes that the whole of one or more associated list items or any cell are combined with whole.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology), there is meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless by specific definitions as here, the meaning of idealization or too formal otherwise will not be used
To explain.
As shown in Figure 1, the utility model proposes a kind of first embodiments of audio input fault detection circuit, including：With
In gating analog test signal or the selected on-off circuit 1 of microphone signal, for converting analog signals into digital signal
Analog to digital conversion circuit 2, the processor 3 for handling the digital signal；The input terminal of analog-digital conversion circuit as described 2 and the choosing
The output end connection of switching circuit 1 is selected, the output end of analog-digital conversion circuit as described 2 is connect with the input terminal of the processor 3；Institute
It includes the digital control analog switch 11 of multi input, the analog test signal and microphone signal difference to state selected on-off circuit 1
It is connect with the input terminal of the digital control analog switch of the multi input 11.
Since microphone generally converts the audio signal of reception to analog signal, therefore the microphone signal and the mould
Quasi- test signal is analog audio signal.The analog test signal can be directly accessed the multi input number by electric ports
Word controls analog switch 11, and the microphone signal is the external audio signal received by the microphone of program request apparatus.This is outer
When portion's audio fault detect, the digital control analog switch of multi input 11 first gates the analog test signal, and the simulation is made to survey
After trial signal is converted to digital signal by analog to digital conversion circuit 2, in input processor 3；Processor 3 is according to the number of reception
Signal can determine whether the selected on-off circuit 1 and analog to digital conversion circuit 2 are normal with the analog test signal；When described
When selected on-off circuit 1 and normal analog to digital conversion circuit 2, the digital control analog switch of multi input 11 gates Mike's wind again
Number, so that the microphone of program request apparatus is received external audio signal, the external audio signal is converted to by analog to digital conversion circuit 2
After digital signal, in input processor 3, processor 3 can determine according to the digital signal of reception with the microphone signal
Whether the microphone of program request apparatus is normal.
To realize the automatic progress of fault detect, the digital control analog switch of the multi input 11 is preferably selected programmable
Digital control switch determines that gating is logical with the gating sequence of advance programming signal or according to the instruction for the controller 3 being previously written
Road.Existing modulus conversion chip or analog-to-digital conversion module can be selected in analog-digital conversion circuit as described 2, so that processor 3 can receive
The analog test signal or the microphone signal.Existing a variety of singlechip chips or micro- place can be selected in the processor 3
Manage device, such as STC microcontrollers, PIC single chip microcomputer, 51 microcontrollers etc..
When the microphone of program request apparatus receives external audio signal, the signal strength of the external audio signal may not
Height, therefore the utility model also proposes second embodiment：The selected on-off circuit 1 further includes amplifying circuit 12, the amplification electricity
The output end of the digital control analog switch of the input terminal on road 12 and the multi input 11 is connect, the output end of the amplifying circuit 12
It is connect with the input terminal of analog-digital conversion circuit as described 2.Amplifying circuit 12 in the present embodiment can amplify the simulation of microphone reception
Signal improves the signal sensitivity of microphone.
The amplifying circuit 12 can be used the electronic components such as field-effect tube, electron tube or transistor and be built, and can also adopt
With existing integrated-type amplifier, such as analogue amplifier PGA2505 etc..The external audio signal also there may be centainly
Interference, such as external noise, radio frequency interference etc., therefore the utility model is it is further proposed that 3rd embodiment：The selection is opened
Powered-down road 1 further includes filter circuit 13, and the output end of the digital control analog switch of multi input passes through the filter circuit 13
It is connect with the input terminal of the amplifying circuit 12.The filter circuit 13 is set to before the amplifying circuit 12, may filter that
Part interference signal and so that the analog test signal of predeterminated frequency or the microphone signal is passed through, improve circuit signal pass
Defeated, amplification and analog-to-digital conversion precision.
Based on 3rd embodiment, the present invention also proposes filter circuit preferred embodiment as shown in Figure 4：The multi input number
It includes the first output end and second output terminal that word, which controls analog switch 11, and the filter circuit 13 includes (shown in Fig. 4 dashed boxes)
Capacitance C1, capacitance C2, capacitance C3, resistance R1, resistance R2；The capacitance C1 first ends are opened with the digital control simulation of the multi input
The connection of the first output end is closed, second end is connect with the capacitance C2 first ends, the capacitance C2 second ends and the multi input number
Word controls the connection of analog switch second output terminal；The resistance R1 first ends are connect with the capacitance C1 first ends, the resistance
R1 second ends are connect with the first end of the resistance R2 and the capacitance C1 second ends, the resistance R2 second ends with it is described how defeated
Enter digital control analog switch second output terminal connection；The capacitance C1 second ends are grounded by the capacitance C3；The filtering
Circuit is also parallel with resistance R3, and the resistance R3 first ends connect with digital control the first output end of analog switch of the multi input
It connects, the resistance R3 second ends are connect with the digital control analog switch second output terminal of the multi input.
Resistance R1 and resistance R2 in the present embodiment are parallel with capacitance, can form passive filter circuit, to filter the wheat
The radio frequency interference or noise signal, cutoff frequency that gram wind senses change with load；The analog test signal is preferably adopted
With low frequency signal, to ensure the treatment effect of the selected on-off circuit 1 and analog to digital conversion circuit 2 to low-frequency audio signal, therefore
In the preferred embodiment, 6.8K can be selected in resistance R1 and resistance R2, and 1000pF can be selected in capacitance C1, capacitance C2, capacitance C3, with
Form low-pass filter, while filtering radio frequency signal interference.
Digital control analog switch CD4053 can be selected in the digital control analog switch of multi input in the present embodiment 11；Such as figure
Shown in 4, first output end can be output pin 14,14 corresponding input pin of output pin be pin 12 and pin 13,
Pin 12 connects the first output end of the microphone signal with a pin in pin 13, another in pin 12 and pin 13
One pin connects the first output end of the analog test signal；The second output terminal can be output pin 15, efferent duct
15 corresponding input pin of foot is pin 1 and pin 2, and pin 1 connects the microphone signal with a pin in pin 2
Another pin in second output terminal, pin 1 and pin 2 connects the second output terminal of the analog test signal.It is illustrating
Connection in, when first output end pin 14 connect pin 12, second output terminal pin 15 connect pin 2 when, then
Gate the microphone signal；When the pin 14 of the first output end gates pin 13, the pin 15 of second output terminal gates pin 1
When, then gate the analog test signal.
There is the digital control analog switch CD4053 of the present embodiment multigroup input to gate channel, therefore can access multiple input
The differential wave of signal, to improve the precision of signal processing.In the preferred embodiment, the microphone signal is using differential defeated
Fashionable, i.e., the audio signal that pin 12 and pin 2 input is equal in magnitude, and opposite in phase can reduce noise jamming, improve the wheat
The processing accuracy of gram wind number；When accessing the analog test signal, analog test signal that pin 13 and pin 1 input it is big
It is small equal, opposite in phase.The analog signal of gating can be defeated by node D and node E respectively after filtering circuit filtering
Go out.Resistance R1 and resistance R2 is also parallel with a resistance R3, and the resistance value of resistance R3 can be determined according to the internal resistance of the microphone of connection, with
The signal of the microphone is set to obtain the transmission of maximum power.
Based on 3rd embodiment, the utility model proposes another embodiments：The amplifying circuit 12 includes analogue amplifier
The output end of PGA2505 and input protection sub-circuit 121, the digital control analog switch of the multi input 11 passes through the filtered electrical
Two analog signal input pins of the analogue amplifier PGA2505 are accessed on road 13 with the input protection sub-circuit 121；Institute
It is programmable high-gain analogue amplifier to state analogue amplifier PGA2505, can be according to the intensity of the microphone signal with storing
The precision of big multiple, audio signal detection is high.
The embodiment of amplifying circuit 12 as shown in Figure 5, it is described when filter circuit embodiment as shown in fig. 4 connects
Input protection sub-circuit includes capacitance C4, capacitance C5, resistance R4, resistance R5, diode D1, diode D2, diode D3, two poles
Pipe D4；The first end of the capacitance C4 is connected to the first end of the resistance R1, and the of the second end connection resistance R4 of capacitance C4
One end, the anode of the second end connection diode D1 of resistance R4, the anode of the cathode connection diode D2 of diode D1, diode
The cathode of D2 connects the second end of the first analog signal input pin and resistance R5 of the analogue amplifier PGA2505, resistance
The second end of the first end connection capacitance C5 of R5, the first end of capacitance C5 connect the second end of the resistance R2；Diode D3's
Cathode connects the second end of resistance R4, the cathode of the anode connection diode D4 of diode D3, the anode connection electricity of diode D4
Hinder the second end of R5.In this circuit embodiments, capacitance C4 and capacitance C5 is blocking coupled capacitor, resistance R4, resistance R5, two poles
Pipe D1, diode D2, diode D3, diode D4 collectively constitute the input protection circuit of analogue amplifier PGA2505, prevent outer
Portion's high level signal causes the damage to IC2 chips.
Based on aforementioned second embodiment, to improve the accuracy of detection of the microphone signal, the selected on-off circuit 1 is also
Including amplifying circuit 12；When the digital control analog switch of the multi input 11 gates the analog test signal, amplification electricity
Road 12 will also amplify the analog test signal；To avoid the analog test signal from exceeding the processor 3 after amplification
The range of receiving of pin, the analog test signal can first pass through before accessing the digital control analog switch of multi input
Signal is decayed.Therefore the utility model also proposes another embodiment：The selected on-off circuit 1 further includes signal attenuation circuit 14,
The input terminal that the analog test signal passes through the signal attenuation circuit 14 and the digital control analog switch of the multi input 11
Connection, causes to damage after amplification to avoid the analog test signal to circuit element.
When the digital control analog switch of the multi input is digital control analog switch CD4053, the analog test signal
For differential wave when, in conjunction with Fig. 4 the embodiment described, the input pin 12 of digital control analog switch CD4053 connects the wheat
First output end of gram wind number, the first output end of the analog test signal after the connection decaying of input pin 13；Number
The input pin 2 of control analog switch CD4053 connects the second output terminal of the microphone signal, the connection decaying of input pin 1
Second input terminal of the analog test signal afterwards.
Based on second embodiment and foregoing embodiments, the utility model is also proposed that another embodiment：The multi input
Digital control analog switch 11 is digital control analog switch CD4053, first group in the digital control analog switch CD4053
The non-moving end of single-pole double-throw switch (SPDT) is separately connected the first end of the first end and the microphone signal of the analog test signal,
The non-moving end of second group of single-pole double-throw switch (SPDT) is separately connected the simulation test letter in the digital control analog switch CD4053
Number second end and the microphone signal second end.In conjunction with described in Fig. 4, i.e., the described digital control analog switch CD4053's
Pin 12, pin 13 and pin 14 form first group of single-pole double-throw switch (SPDT), and pin 12 connects the node B of the microphone signal,
Pin 13 connects the first end of the analog test signal；Pin 1,2 and of pin of the digital control analog switch CD4053
Pin 15 forms second group of single-pole double-throw switch (SPDT), and pin 1 connects the second end of the analog test signal, and pin 2 connects described
The node C of microphone signal, node A are the earth point of the microphone signal.The digital control analog switch CD4053
Described in the moved end (i.e. pin 14) of one group of single-pole double-throw switch (SPDT) and moved end (the i.e. pin 15) connection of second group of single-pole double-throw switch (SPDT)
The input terminal of amplifying circuit；By the moved end for controlling the digital control analog switch CD4053, you can gate the microphone
Signal or the analog test signal.Digital control analog switch CD4053 in the present embodiment can pass through the logic of control signal
Combination accurately gates one group of analog signal, and handoff response speed is fast.
When the microphone signal and the analog test signal are differential wave, the pin 14 and pin 15 are distinguished
The opposite differential wave of output voltage.In conjunction with shown in Fig. 4, the differential wave of the digital control analog switch CD4053 outputs can
It accesses in the filter circuit and is filtered, and exported respectively by the node D and node E of the filter circuit.Further,
The node D and node E can also be separately connected it is described input protection sub-circuit input terminal, i.e., the first end of the described capacitance C4 and
The first end of the capacitance C5, so that the analog signal by filtering accesses and carries out signal amplification in analogue amplifier PGA2505.
Based on first embodiment, the present invention also proposes another embodiment, as shown in fig. 6, the selected on-off circuit 1 can wrap
The first output end and second output terminal are included, analog-digital conversion circuit as described 2 includes modulus conversion chip CS5381, input filter electricity
Sub-circuit is arranged in road and operating point；
The input filter sub-circuit includes the first amplifier OPA2134, the second amplifier OPA2134, capacitance C28, electricity
Hold C29, capacitance C30, resistance R12, resistance R13, resistance R14, resistance R15；The homophase input of the first amplifier OPA2134
End is connect with the first output end of the selected on-off circuit, inverting input and the electricity of the first amplifier OPA2134
The connection of R12 first ends is hindered, the resistance R12 second ends are connect with the output end of the first amplifier OPA2134, the resistance
R14 first ends are connect with the output end of the first amplifier OPA2134, and the resistance R14 second ends access the modulus and turn
Change the first input pins of chip CS5381；The in-phase input end of the second amplifier OPA2134 and the selected on-off circuit
Second output terminal connects, and the inverting input of the second amplifier OPA2134 is connect with the resistance R13 first ends, described
Resistance R13 second ends are connect with the output end of the second amplifier OPA2134, the resistance R15 first ends and described second
The output end of amplifier OPA2134 connects, and the resistance R15 second ends access the modulus conversion chip CS5381 second and input
Pin；The first end of the capacitance C30 connects the second end of the resistance R14, and the second end of the capacitance C30 connects the electricity
Hinder the second end of R15；
The operating point setting sub-circuit includes resistance R10 and resistance R11, the resistance R10 first ends and described first
The in-phase input end of amplifier OPA2134 connects, and the resistance R10 second ends are connect with the resistance R11 first ends, the electricity
Resistance R11 second ends are connect with the in-phase input end of the second amplifier OPA2134, described in the resistance R10 second ends access
The static reference voltage VQ pins of modulus conversion chip CS5381.
Modulus conversion chip CS5381 in the present embodiment is multi input modulus conversion chip, when the selected on-off circuit
When the signal of 1 output is differential wave, modulus conversion chip CS5381 can receive the differential wave simultaneously, and to described differential
Signal is amplified.In conjunction with foregoing embodiments, since the selected on-off circuit 1 may include the amplifying circuit and the filter
Wave circuit, in conjunction with shown in Fig. 5, the first output end and second output terminal of the selected on-off circuit 1 may respectively be the node F
With node G, i.e. pin V of the signal by the selected on-off circuit 1 processing from the analogue amplifier PGA2505OUT+With
Pin VOUTOutput, the pin VOUT+It can be used as the first output end of the selected on-off circuit 1, the pin VOUT-It can make
For the second output terminal of the selected on-off circuit.
When analog-digital conversion circuit as described includes modulus conversion chip CS5381, to avoid input signal from causing to damage to chip
It is bad, the input filter sub-circuit can be accessed before the input pin of modulus conversion chip CS5381, i.e., the described node F and institute
State node G signal be respectively connected to the first amplifier OPA2134 in-phase input end and the second amplifier OPA2134 it is same mutually defeated
Enter end.It, can be between the node F and the in-phase input end of the first amplifier OPA2134 for the direct current signal in barrier circuit
Capacitance C26 is connected, capacitance C27 is connected between the node G and the in-phase input end of the second amplifier OPA2134；Preferably,
The capacitance C26 and capacitance C27 is the electrolytic capacitor of polarized, and the cathode of the capacitance C26 is connect with the node F,
The in-phase input end of the first amplifier OPA2134 of anode connection of the capacitance C26, cathode and the section of the capacitance C27
Point G connections, the in-phase input end of the second amplifier OPA2134 of anode connection of the capacitance C27；The cathode of the capacitance C26
Pass through a resistance eutral grounding with the cathode of the capacitance C27.
When the signal of access is differential wave, the operating point setting sub-circuit can be also set, so that the signal of access
Voltage is equal-sized inversion signal.Since the operating voltage of modulus conversion chip CS5381 is 5V, convertible signal voltage
Analog voltage between -2.5V to+2.5V, therefore the pipe of resistance R10, resistance R11 and modulus conversion chip CS5381 can be passed through
Foot VQ sets the quiescent potential of the modulus conversion chip CS5381 to 2.5V.The operating point be arranged sub-circuit connection with
The setting of operating voltage can refer to the databook of modulus conversion chip CS5381, and details are not described herein.
As previously mentioned, to avoid the analog test signal from exceeding the reception model of 3 pin of the processor after amplification
It encloses, signal decaying can be first passed through in the analog test signal before accessing the digital control analog switch of multi input；It removes
Except this, the amplifying circuit 12 can also be accessed to the input terminal of the digital control analog switch of the multi input 11, i.e.,：The wheat
Gram wind number accesses the digital control analog switch 11 of the multi input, the simulation test after the amplification of the amplifying circuit 12
Signal is directly accessed the digital control analog switch of the multi input 11 without the amplifying circuit 12.Therefore the present invention also proposes separately
One embodiment：The selected on-off circuit 1 further includes amplifying circuit 12, and the microphone signal is connect by the amplifying circuit 12
The input terminal for entering the digital control analog switch of the multi input 11, so that the amplifying circuit 12 amplifies the microphone signal.
Embodiment shown in fig. 5 can be used in the amplifying circuit 12, other amplifier chips also can be used or using basic
Electronic component builds amplifying circuit.When the present embodiment uses amplifying circuit 12 shown in fig. 5, and use filter circuit above-mentioned
With digital control analog switch CD4053, then the circuit diagram of the present embodiment can be as shown in Figure 7.The microphone signal is respectively from section
Point B and node C accesses the filter circuit 13, passes through input protection sub-circuit and analogue amplifier after filtered
The pin V of PGA2505IN+With pin VIN-Connection；Microphone signal by amplification is respectively connected to digital control analog switch
The non-moving end (i.e. pin 12) of first group of single-pole double-throw switch (SPDT) of CD4053 and the non-moving end of second group of single-pole double-throw switch (SPDT) (are managed
Foot 2).The analog test signal is directly accessed digital control analog switch CD4053's without analogue amplifier PGA2505
Another non-moving end of another non-moving end (i.e. pin 13) and second group of single-pole double-throw switch (SPDT) of first group of single-pole double-throw switch (SPDT)
(i.e. pin 1).By the moved end (i.e. pin 14 and pin 15) for controlling the digital control analog switch CD4053, you can gating
Amplified microphone signal or the not enlarged analog test signal.The signal of gating can pass through node F and node G into
Enter the analog to digital conversion circuit.
Based on the above various embodiments, the utility model also proposes that a kind of program request apparatus, the program request apparatus include aforementioned
Audio input fault detection circuit described in one, therefore the program request apparatus also has automatic detection microphone failure above-mentioned
Function.
The above is only some embodiments of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of audio input fault detection circuit, which is characterized in that including：For gating analog test signal or Mike's wind
Number selected on-off circuit, the analog to digital conversion circuit for converting analog signals into digital signal, for handling the number
The processor of signal；The input terminal of analog-digital conversion circuit as described is connect with the output end of the selected on-off circuit, the modulus
The output end of conversion circuit is connect with the input terminal of the processor；The selected on-off circuit includes the digital control mould of multi input
Quasi- switch, the analog test signal and microphone signal connect with the input terminal of the digital control analog switch of the multi input respectively
It connects.
2. audio input fault detection circuit according to claim 1, which is characterized in that the selected on-off circuit also wraps
Amplifying circuit is included, the input terminal of the amplifying circuit is connect with the output end of the digital control analog switch of the multi input, described
The output end of amplifying circuit and the input terminal of analog-digital conversion circuit as described connect.
3. audio input fault detection circuit according to claim 2, which is characterized in that the selected on-off circuit also wraps
Filter circuit is included, the output end of the digital control analog switch of multi input passes through the filter circuit and the amplifying circuit
Input terminal connects.
4. audio input fault detection circuit according to claim 3, which is characterized in that the digital control mould of multi input
Quasi- switch includes the first output end and second output terminal, the filter circuit include capacitance C1, capacitance C2, capacitance C3, resistance R1,
Resistance R2；The capacitance C1 first ends are connect with digital control the first output end of analog switch of the multi input, second end and institute
The connection of capacitance C2 first ends is stated, the capacitance C2 second ends connect with the digital control analog switch second output terminal of the multi input
It connects；The resistance R1 first ends are connect with the capacitance C1 first ends, the resistance R1 second ends and the first of the resistance R2
End is connected with the capacitance C1 second ends, and the resistance R2 second ends are exported with the digital control analog switch second of the multi input
End connection；The capacitance C1 second ends are grounded by the capacitance C3；The filter circuit is also parallel with resistance R3, the resistance
R3 first ends are connect with digital control the first output end of analog switch of the multi input, the resistance R3 second ends with it is described how defeated
Enter digital control analog switch second output terminal connection.
5. audio input fault detection circuit according to claim 3, which is characterized in that the amplifying circuit includes simulation
Amplifier PGA2505 and input protection sub-circuit, the output end of the digital control analog switch of multi input pass through the filtering
Circuit accesses two analog signal input pins of the analogue amplifier PGA2505 with the input protection sub-circuit.
6. audio input fault detection circuit according to claim 2, which is characterized in that the selected on-off circuit also wraps
Signal attenuation circuit is included, the analog test signal is opened by the signal attenuation circuit and the digital control simulation of the multi input
The input terminal of pass connects.
7. audio input fault detection circuit according to claim 2, which is characterized in that the digital control mould of multi input
It is digital control analog switch CD4053 to intend switching, first group of single-pole double-throw switch (SPDT) in the digital control analog switch CD4053
Non-moving end be separately connected the analog test signal first end and the microphone signal first end, it is described digital control
In analog switch CD4053 the non-moving end of second group of single-pole double-throw switch (SPDT) be separately connected the analog test signal second end and
The second end of the microphone signal；The moved end of described first group of single-pole double-throw switch (SPDT) of digital control analog switch CD4053 and
The moved end of two groups of single-pole double-throw switch (SPDT)s connects the input terminal of the amplifying circuit.
8. audio input fault detection circuit according to claim 1, which is characterized in that the selected on-off circuit includes
First output end and second output terminal, analog-digital conversion circuit as described include modulus conversion chip CS5381, input filter sub-circuit
Sub-circuit is set with operating point；
The input filter sub-circuit includes the first amplifier OPA2134, the second amplifier OPA2134, capacitance C28, capacitance
C29, capacitance C30, resistance R12, resistance R13, resistance R14, resistance R15；The in-phase input end of the first amplifier OPA2134
It is connect with the first output end of the selected on-off circuit, inverting input and the resistance of the first amplifier OPA2134
R12 first ends connect, and the resistance R12 second ends are connect with the output end of the first amplifier OPA2134, the resistance
R14 first ends are connect with the output end of the first amplifier OPA2134, and the resistance R14 second ends access the modulus and turn
Change the first input pins of chip CS5381；The in-phase input end of the second amplifier OPA2134 and the selected on-off circuit
Second output terminal connects, and the inverting input of the second amplifier OPA2134 is connect with the resistance R13 first ends, described
Resistance R13 second ends are connect with the output end of the second amplifier OPA2134, the resistance R15 first ends and described second
The output end of amplifier OPA2134 connects, and the resistance R15 second ends access the modulus conversion chip CS5381 second and input
Pin；The first end of the capacitance C30 connects the second end of the resistance R14, and the second end of the capacitance C30 connects the electricity
Hinder the second end of R15；
The operating point setting sub-circuit includes resistance R10 and resistance R11, and the resistance R10 first ends are amplified with described first
The in-phase input end of device OPA2134 connects, and the resistance R10 second ends are connect with the resistance R11 first ends, the resistance
R11 second ends are connect with the in-phase input end of the second amplifier OPA2134, and the resistance R10 second ends access the mould
The static reference voltage VQ pins of number conversion chip CS5381.
9. audio input fault detection circuit according to claim 1, which is characterized in that the selected on-off circuit also wraps
Amplifying circuit is included, the microphone signal accesses the input of the digital control analog switch of the multi input by the amplifying circuit
End.
10. a kind of program request apparatus, which is characterized in that it includes claim 1-9 any one of them audio input fault detects
Circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820343786.0U CN208061187U (en) | 2018-03-13 | 2018-03-13 | Audio input fault detection circuit and program request apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820343786.0U CN208061187U (en) | 2018-03-13 | 2018-03-13 | Audio input fault detection circuit and program request apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112243182A (en) * | 2019-07-17 | 2021-01-19 | 北京声智科技有限公司 | Pickup circuit, method and device |
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
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2018
- 2018-03-13 CN CN201820343786.0U patent/CN208061187U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112243182A (en) * | 2019-07-17 | 2021-01-19 | 北京声智科技有限公司 | Pickup circuit, method and device |
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
| CN113131931B (en) * | 2021-04-27 | 2024-05-07 | 中安智联未来有限公司 | Analog input/output hybrid circuit |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
| CN114567848B (en) * | 2022-01-26 | 2024-05-07 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
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