CN208143483U - Audio output circuit, fault detection circuit and program request apparatus - Google Patents
Audio output circuit, fault detection circuit and program request apparatus Download PDFInfo
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- CN208143483U CN208143483U CN201820384780.8U CN201820384780U CN208143483U CN 208143483 U CN208143483 U CN 208143483U CN 201820384780 U CN201820384780 U CN 201820384780U CN 208143483 U CN208143483 U CN 208143483U
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Abstract
The utility model provides a kind of audio output circuit, fault detection circuit and program request apparatus, the audio output circuit：For exporting the processor circuit of digital audio and video signals, for the digital audio and video signals to be converted to the D/A converting circuit of analog audio signal, for filtering the balancing filter circuit of the analog audio signal, for adjusting the power conditioning circuitry of the analog audio signal output power；The input terminal of the D/A converting circuit connects the output end of the processor circuit, and the output end of the D/A converting circuit connects the balancing filter circuit；The output end of the balancing filter circuit connects the input terminal of the power conditioning circuitry.The audio output circuit strong antijamming capability of the utility model, high reliablity can reduce the failure rate of existing head circuit, and can also further expand fault detection circuit, to find head circuit failure in time.
Description
Technical field
The utility model relates to electronic circuit technology, especially a kind of audio output circuit, fault detection circuit and program request
Device.
Background technique
Currently, mini program request apparatus in the market provides conveniently program request experience for user；Headphone set therein
Part is the significant components of program request apparatus, directly affects the sound quality that user listens to.It is each since the frequency of usage of earphone is very high
Program request amusement must one of component and one of the mini highest component of program request apparatus failure rate, damage will make to user
At inconvenience, especially self-service mini program request apparatus.Self-service mini program request apparatus is due to unattended, when earphone damages
When, user will be unable to hear background music by earphone and oneself sing effect, can only hear background by outgoing loudspeaker
Music and singing effect；But in mini program request apparatus narrow space, microphone by the audio broadcasted to outgoing loudspeaker more
Sensitivity, thus make microphone receive should not the audio-frequency informations such as received background music, seriously affect the program request experience of user.For
Check the failure of the components such as microphone, equipment, which launches quotient, need to generally arrange a large amount of personnel to carry out scene inspections, this test mode
Time-consuming more, high labor cost；Moreover, earphone can not normal use when, only be visually difficult to determine fault point, need professional
It can just detect, cannot be excluded in time so as to cause earphone failure, the recreation experience and equipment for affecting program request customer launch quotient
Business revenue.Therefore a kind of reliable audio output circuit is for program request equipment, it is particularly important.
Utility model content
The purpose of this utility model aims to solve at least one of above-mentioned technological deficiency, especially solution strong antijamming capability and
The problem of reliable performance.
The utility model provides a kind of audio output circuit, including：For exporting the processor electricity of digital audio and video signals
Road, for the digital audio and video signals to be converted to the D/A converting circuit of analog audio signal, for filtering the analog audio
The balancing filter circuit of frequency signal, for adjusting the power conditioning circuitry of the analog audio signal output power；The digital-to-analogue
The input terminal of conversion circuit connects the output end of the processor circuit, and the output end connection of the D/A converting circuit is described flat
Weigh filter circuit；The output end of the balancing filter circuit connects the input terminal of the power conditioning circuitry.
Preferably, the D/A converting circuit includes the first output signal port for exporting opposite phase analog audio signal
With the second output signal port, the balancing filter circuit includes the first filter module and the second filter module；First filter
Two input terminals of wave module are separately connected first output signal port and second output signal port, and output end connects
Connect the first input pin of the power conditioning circuitry；Two output ends of second filter module are separately connected described first
Output signal port and second output signal port, output end connect the second input pin of the power conditioning circuitry.
Preferably, first filter module includes resistance R301, resistance R302, resistance R303, resistance R304, resistance
R305, resistance R306, resistance R307, capacitor C301, capacitor C302, capacitor C303, capacitor C304, capacitor C305, capacitor C306,
First amplifier OPA2134；
The resistance R301 first end connects first output signal port, and second end connects the resistance R303 first
End, the resistance R303 second end connect the first amplifier OPA2134 inverting input terminal, first amplifier
OPA2134 output end connects the capacitor C306 first end；The capacitor C306 second end connects first input pin, and
It is grounded by the resistance R307；The capacitor C302 first end connects the resistance R303 second end, the capacitor C302 the
Two ends connect the first amplifier OPA2134 output end and the resistance R304 first end；The resistance R304 second end connects
Connect the resistance R301 second end and the capacitor C301 first end, the capacitor C301 second end ground connection；
The resistance R302 first end connects second output signal port, and second end connects the resistance R306 first
End, the resistance R306 second end connect the first amplifier OPA2134 non-inverting input terminal；The resistance R302 second end connects
Meet the capacitor C303 first end and the resistance R305 first end, the capacitor C303 second end ground connection, the resistance R305
Second end is grounded by the capacitor C304；The capacitor C305 first end connects the resistance R306 second end, the capacitor
C305 second end ground connection.
Preferably, second filter module includes resistance R311, resistance R312, resistance R313, resistance R314, resistance
R315, resistance R316, resistance R317, capacitor C311, capacitor C312, capacitor C313, capacitor C314, capacitor C315, capacitor C316,
Second amplifier OPA2134；
The resistance R311 first end connects second output signal port, and second end connects the resistance R313 first
End, the resistance R313 second end connect the second amplifier OPA2134 inverting input terminal, second amplifier
OPA2134 output end connects the capacitor C316 first end, the capacitor C316 second end connect second input pin and
The resistance R317 first end, the resistance R317 second end ground connection；The capacitor C312 first end connects the resistance R313
Second end, the capacitor C312 second end connect the second amplifier OPA2134 output end and the resistance R314 first end；
The resistance R314 second end connects the resistance R311 second end and the capacitor C311 first end, the capacitor C311 second
End ground connection；
The resistance R312 first end connects first output signal port, and second end connects the resistance R316 first
End, the resistance R316 second end connect the second amplifier OPA2134 non-inverting input terminal；The resistance R312 second end connects
Meet the capacitor C313 first end and the resistance R315 first end, the capacitor C313 second end ground connection, the resistance R315
Second end connects the capacitor C314 first end, the capacitor C314 second end ground connection；The capacitor C315 first end connects institute
State resistance R316 second end, the capacitor C315 second end ground connection.
Preferably, the power conditioning circuitry includes volume adjusting module, and the volume adjusting module includes chip
PGA4311, the output end of the balancing filter circuit connect the analog signal input pin 3 and pin of the chip PGA4311
10。
Preferably, the power conditioning circuitry further includes earphone amplification module, and the earphone amplification module is put including first
Big device LME49990, the second amplifier LME49990, third amplifier LME49990, the 4th amplifier LME49600, resistance
R401, resistance R402, resistance R403, resistance R404, resistance R405, resistance R406, capacitor C403, capacitor C404；
The analog signal output pin 8 of the chip PGA4311 passes through capacitor C401 connection first amplifier
The output end of the non-inverting input terminal of LME49990, the first amplifier LME49990 connects the resistance R403 first end, institute
The non-inverting input terminal that resistance R403 second end was grounded and was connected the third amplifier LME49990 by the resistance R405 is stated,
The output end of the third amplifier LME49990 connects the pin 2 of the 4th amplifier LME49600；
The analog signal output pin 5 of the chip PGA4311 passes through capacitor C402 connection second amplifier
The output end of the non-inverting input terminal of LME49990, the second amplifier LME49990 passes through the resistance R404 connection electricity
R406 first end is hindered, the resistance R406 second end connects the output pin 2 of the 4th amplifier LME49600；The resistance
R406 first end is also connected with the inverting input terminal of the third amplifier LME49990；
The inverting input terminal of the first amplifier LME49990 connects the output end of the first amplifier LME49990,
The inverting input terminal of the second amplifier LME49990 connects the output end of the second amplifier LME49990；Described first
The non-inverting input terminal of amplifier LME49990 is grounded by the resistance R401, and the second amplifier LME49990's is same mutually defeated
Enter end to be grounded by the resistance R402.
Preferably, the D/A converting circuit includes analog-digital converter CS4398, the mould of the analog-digital converter CS4398
Quasi- signal output pin 23 and pin 24 connect the balancing filter circuit.
Preferably, the processor circuit includes chip TMS320C6657, the number letter of the chip TMS320C6657
Number output to the analog-digital converter CS4398 pin 3.
The utility model also proposes a kind of fault detection circuit comprising aforementioned described in any item audio output circuits.
Preferably, the fault detection circuit further includes：For receiving the analogue audio frequency of the audio output circuit output
The selected on-off circuit of signal, for the analog audio signal to be converted to the analog to digital conversion circuit of digital audio and video signals；Institute
The input terminal for stating analog to digital conversion circuit is connect with the output end of the selected on-off circuit, the output end of analog-digital conversion circuit as described
It is connect with the input terminal of the processor circuit.
The utility model also proposes a kind of program request apparatus comprising aforementioned described in any item audio output circuits.
The beneficial effects of the utility model are as follows：
1, the anti-interference energy of circuit can be improved by the balancing filter circuit in the audio output circuit of the utility model
Power, and the high reliablity of signal processing, can reduce the failure rate of existing head circuit；And it can also be by this audio output circuit
One step extends fault detection circuit, to find head circuit failure in time.
2, two rank active balancing formula filter circuits can be selected in the balancing filter circuit of the utility model, can further improve filter
Wave effect enhances the anti-interference ability of circuit；And the adjustable filtering of the design parameter by adjusting wherein each electronic component
Frequency range can form low-pass filter, improve the play sound effect of audio output circuit.
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 obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The utility model is above-mentioned and/or additional aspect and advantage from the following description of the accompanying drawings of embodiments will
Become obvious and is readily appreciated that, wherein：
Fig. 1 is the circuit block diagram of the utility model audio output circuit first embodiment；
Fig. 2 is the circuit diagram of balancing filter circuit embodiments in the utility model audio output circuit；
Fig. 3 is the circuit diagram of power conditioning circuitry embodiment in the utility model audio output circuit；
Fig. 4 is the circuit diagram of D/A converting circuit embodiment in the utility model audio output circuit；
Fig. 5 is the circuit block diagram of the embodiment of the utility model fault detection circuit.
Specific embodiment
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, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
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 one or more associated wholes for listing item or any cell and all combinations.
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 term), there is meaning identical with the general understanding of 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 idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
First embodiment as shown in Figure 1, the audio output circuit of the utility model, including：For exporting digital audio
The processor circuit 1 of signal is used for the digital audio and video signals to be converted to the D/A converting circuit 2 of analog audio signal
In the balancing filter circuit 3 for filtering the analog audio signal, for adjusting the power of the analog audio signal output power
Adjust circuit 4；The input terminal of the D/A converting circuit 2 connects the output end of the processor circuit 1, the digital-to-analogue conversion electricity
The output end on road 2 connects the balancing filter circuit 3；The output end of the balancing filter circuit 3 connects the power regulation electricity
The input terminal on road 4.
In use, the digital audio and video signals in the processor circuit 1 are exported to the D/A converting circuit 2, digital-to-analogue turns
It changes circuit 2 and the digital signal is converted into corresponding analog audio signal, output to the balancing filter circuit 3；It is described flat
The analog audio signal can be balanced filtering processing by weighing apparatus filter circuit 3, can play the role of better noise suppressed, be improved
The anti-interference ability of the analog audio signal；Enter the power regulation by balancing filter treated analog audio signal
Circuit 4 achievees the purpose that adjust volume and is adapted to external sounding component.The audio output circuit high reliablity of the utility model,
Strong antijamming capability can reduce the failure rate of existing head circuit；And pass through the also settable fault detection of the audio output circuit
Circuit, to find head circuit failure in time.
The external sounding component can be earphone or outgoing loudspeaker.When the audio output circuit application of the utility model
When mini program request apparatus, the external sounding component is preferably earphone.
In the processor circuit 1 may include that operational capability is strong and extensive interface more than digital signal processing chip or list
Piece machine, such as digital processing chip TMS320C6657, to guarantee the processing speed and sound quality of the digital audio and video signals, and can
It receives simultaneously and output multi-signal；When the utility model is applied to mini program request apparatus, operational capability is connect with expansible by force
Digital signal processing chip or single-chip microcontroller more than mouthful can match a variety of demands for extending mini program request apparatus.The digital-to-analogue conversion electricity
Road 2 may include analog-digital chip, and the signal input tube foot of the analog-digital chip can be with the number of the chip or single-chip microcontroller
Word audio signal output pin is directly connected to；Meanwhile the clock signal pin of described two chips can also be connected according to demand
It connects, to control the audio signal of output left and right acoustic channels.
According to the first embodiment, the D/A converting circuit 1 may include output opposite phase analog audio signal
First output signal port and the second output signal port, with exporting differential wave is balanced filtering simultaneously；The balance filter
Wave circuit 3 includes the first filter module and the second filter module；Two input terminals of first filter module are separately connected institute
State the first output signal port and second output signal port, it is first defeated to connect the power conditioning circuitry 4 for output end
Enter pin；Two output ends of second filter module are separately connected first output signal port and second output
Signal port, output end connect the second input pin of the power conditioning circuitry.First filter module and described second
Filter module can simultaneously the phase difference of the first output signal port described in Balance Treatment and the output of the second output signal port it is opposite
Two groups of signals avoid the abnormal currents such as electrostatic to further increase the anti-interference ability of the utility model audio output circuit
Interference to circuit.
The balancing filter circuit embodiments in conjunction with described in Fig. 2, wherein first filter module includes resistance R301, electricity
Hinder R302, resistance R303, resistance R304, resistance R305, resistance R306, resistance R307, capacitor C301, capacitor C302, capacitor
C303, capacitor C304, capacitor C305, capacitor C306, the first amplifier OPA2134；
The resistance R301 first end connects first output signal port, i.e. node A, and second end connects the resistance
R303 first end, the resistance R303 second end connect the first amplifier OPA2134 inverting input terminal, first amplification
Device OPA2134 output end connects the capacitor C306 first end, and the capacitor C306 second end connects first input pin,
The i.e. described node C, and be grounded by the resistance R307；The capacitor C302 first end connects the resistance R303 second end,
The capacitor C302 second end connects the first amplifier OPA2134 output end and the resistance R304 first end；The electricity
It hinders R304 second end and connects the resistance R301 second end and the capacitor C301 first end, the capacitor C301 second is terminated
Ground；
The resistance R302 first end connects second output signal port, i.e. node B, and second end connects the resistance
R306 first end, the resistance R306 second end connect the first amplifier OPA2134 non-inverting input terminal；The resistance R302
Second end connects the capacitor C303 first end and the resistance R305 first end, and the capacitor C303 second end ground connection is described
Resistance R305 second end is grounded by the capacitor C304；The capacitor C305 first end connects the resistance R306 second end,
The capacitor C305 second end ground connection.
The inverting input terminal of the first amplifier OPA2134 is connected with first output signal port in the present embodiment,
It can receive one group of difference analogue audio signal；Its non-inverting input terminal is connected with second output signal port, can receive another
One group of difference analogue audio signal after two groups of difference analogue audio signals are amplified by the first amplifier OPA2134, then accesses institute
Power conditioning circuitry 4 is stated, the anti-interference ability of circuit is improved.
Further, the utility model also proposes a kind of two rank active balancing formula filter circuits, as shown in Figure 2：Described
Two filter modules include resistance R311, resistance R312, resistance R313, resistance R314, resistance R315, resistance R316, resistance R317,
Capacitor C311, capacitor C312, capacitor C313, capacitor C314, capacitor C315, capacitor C316, the second amplifier OPA2134；
The resistance R311 first end connects second output signal port, i.e. node B, and second end connects the resistance
R313 first end, the resistance R313 second end connect the second amplifier OPA2134 inverting input terminal, second amplification
Device OPA2134 output end connects the capacitor C316 first end, and the capacitor C316 second end connects second input pin,
That is node D, the capacitor C316 second end also pass through the resistance R317 ground connection；The capacitor C312 first end connects the electricity
R313 second end is hindered, the capacitor C312 second end connects the second amplifier OPA2134 output end and the resistance R314
First end；The resistance R314 second end connects the resistance R311 second end and the capacitor C311 first end, the capacitor
C311 second end ground connection；
The resistance R312 first end connects first output signal port, i.e. node A, and second end connects the resistance
R316 first end, the resistance R316 second end connect the second amplifier OPA2134 non-inverting input terminal；The resistance R312
Second end connects the capacitor C313 first end and the resistance R315 first end, and the capacitor C313 second end ground connection is described
Resistance R315 second end connects the capacitor C314 first end, the capacitor C314 second end ground connection；The capacitor C315 first
End connects the resistance R316 second end, the capacitor C315 second end ground connection.
The two rank active balancing formula filter circuits of the present embodiment further improve the filter effect of filter circuit, enhance
The anti-interference ability of circuit；And the frequency range of the adjustable filtering of the design parameter by adjusting wherein each electronic component；Work as selection
When resistance, capacitor and amplifier parameter in diagram, low-pass filter can be formed, to improve the play sound effect and electricity of voicefrequency circuit
The test effect on road.Certainly, other similar component substitutions also can be used in the electronic component in illustrative embodiments, and are not limited to
The capacitance of each capacitor and the resistance value of resistance and with first in specific device and device parameters, such as circuit in diagram
Amplifier OPA2134 or the second amplifier OPA2134 has the Amplifier type etc. of similar functions.
The power conditioning circuitry 4 may include volume adjusting module, and the circuit diagram of the volume adjusting module can refer to Fig. 3
It is shown：The volume adjusting module includes chip PGA4311, and the output end of the balancing filter circuit 3 (can refer to aforementioned implementation
Node C and node D in example) the analog signal input pin 3 and pin 10 of the chip PGA4311 is connected, to receive simultaneously
The differential signal of two groups of filtering.Chip PGA4311 is high-performance four-way audio volume control device, it is ensured that exports audio
Low noise and fidelity.
As shown in figure 3, the power conditioning circuitry 4 further includes earphone amplification module, the earphone amplification module includes the
One amplifier LME49990, the second amplifier LME49990, third amplifier LME49990, the 4th amplifier LME49600, electricity
Hinder R401, resistance R402, resistance R403, resistance R404, resistance R405, resistance R406, capacitor C403, capacitor C404；
The analog signal output pin 8 of the chip PGA4311 passes through capacitor C401 connection first amplifier
The output end of the non-inverting input terminal of LME49990, the first amplifier LME49990 connects the resistance R403 first end, institute
The non-inverting input terminal that resistance R403 second end was grounded and was connected the third amplifier LME49990 by the resistance R405 is stated,
The output end of the third amplifier LME49990 connects the pin 2 of the 4th amplifier LME49600；
The analog signal output pin 5 of the chip PGA4311 passes through capacitor C402 connection second amplifier
The output end of the non-inverting input terminal of LME49990, the second amplifier LME49990 passes through the resistance R404 connection electricity
R406 first end is hindered, the resistance R406 second end connects the output pin 2 of the 4th amplifier LME49600；The resistance
R406 first end is also connected with the inverting input terminal of the third amplifier LME49990；
The inverting input terminal of the first amplifier LME49990 connects the output end of the first amplifier LME49990,
The inverting input terminal of the second amplifier LME49990 connects the output end of the second amplifier LME49990；Described first
The non-inverting input terminal of amplifier LME49990 is grounded by the resistance R401, and the second amplifier LME49990's is same mutually defeated
Enter end to be grounded by the resistance R402.
Chip PGA4311 in the present embodiment cooperates a three amplifier LME49990 and amplifier LME49990,
Balanced type volume adjustment Earphone Amplifier can be formed, and the analog audio signal is exported by node E to the sounding of earphone
Device achievees the purpose that adjust volume in order to adjust the audio power that the sounding device issues.
In the first embodiment, the D/A converting circuit 2 may include analog-digital converter CS4398, the analog-digital converter
The analog signal output pin 23 and pin 24 of CS4398 connects the balancing filter circuit 3.As shown in connection with fig. 4, when modulus turns
When the digital signal input pin 3 of parallel operation CS4398 receives serial digital signal, pass through 24 output difference of pin 23 and pin
Balanced signal, to be balanced filtering by the balancing filter circuit 3.
Heretofore described processor circuit 1 may include chip TMS320C6657, to take with analog-digital converter CS4398
With use；The digital signal of the chip TMS320C6657 is exported to the pin 3 of the analog-digital converter CS4398.Chip
TMS320C6657 is the digital processing chip of double-core KeyStone framework, it provides the intercore communication mode interrupted, and mentions thus
For corresponding hardware register；By the double-core chip, the circuit of the utility model can realize parallel processing mechanism, more to realize
The parallel processing of task, convenient for extending the function of mini program request apparatus.
Based on above each audio output circuit, the present invention also proposes a kind of fault detection circuit comprising any one of aforementioned
Whether the audio output circuit is normal to detect the audio output circuit.
In one embodiment of fault detection circuit of the present invention, as shown in figure 5, the fault detection circuit further includes：
For receiving the selected on-off circuit 5 of the analog audio signal of the audio output circuit output, it is used for the analogue audio frequency
Signal is converted to the analog to digital conversion circuit 6 of digital audio and video signals；The input terminal of analog-digital conversion circuit as described 6 and the selection switch
The output end of circuit 5 connects, and the output end of analog-digital conversion circuit as described 5 is connect with the input terminal of the processor circuit 1.It is described
The analog audio signal of audio output circuit output can be by selected on-off circuit 5 and analog to digital conversion circuit 6 by the processor
Circuit 1 receives.When selected on-off circuit 5 receives the analog audio signal, the sounding device can be received by microphone and is issued
, by medium propagate the analog audio signal, also can directly receive the analog audio by input end of analog signal mouth
Frequency signal, and propagated without the medium.If the processor circuit 1 can normally receive the analog audio signal, say
The bright audio output circuit is normal；If the processor circuit 1 can not receive the analog audio signal, illustrate described in
Audio output circuit is abnormal.
Further, the utility model can also determine period of fault detection and specific by the processor circuit 1
Process, and extension are more multi-functional；Such as external processor calls the inspection of the utility model audio output fault detection circuit
Signal is surveyed, to realize reporting automatically and distributing the functions such as maintenance personal automatically for fault point, there is great market and economy
Value.
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 output circuit described in one obtains better acoustical quality so that the program request apparatus has good anti-interference ability.
When the program request apparatus includes the fault detection circuit, it may be provided with the functions of test earphone and microphone failure；And lead to
Specific testing process is crossed, the circuit position where fault point can be accurately positioned.
Audio output circuit described in the utility model can be applied to program request apparatus, be equally applicable for other devices
Audio output circuit.The above is only some embodiments of the utility model, it is noted that for the art
For those of ordinary skill, without departing from the principle of this utility model, several improvements and modifications can also be made, these
Improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (11)
1. a kind of audio output circuit, which is characterized in that including：For exporting the processor circuit of digital audio and video signals, it is used for
The D/A converting circuit that the digital audio and video signals are converted to analog audio signal, for filtering the analog audio signal
Balancing filter circuit, for adjusting the power conditioning circuitry of the analog audio signal output power；The D/A converting circuit
Input terminal connect the output end of the processor circuit, the output end of the D/A converting circuit connects the balancing filter electricity
Road；The output end of the balancing filter circuit connects the input terminal of the power conditioning circuitry.
2. audio output circuit according to claim 1, which is characterized in that the D/A converting circuit includes that output is opposite
The the first output signal port and the second output signal port of phase analog audio signal, the balancing filter circuit include first
Filter module and the second filter module；Two input terminals of first filter module are separately connected first output signal end
Mouth and second output signal port, output end connect the first input pin of the power conditioning circuitry；Second filter
Two output ends of wave module are separately connected first output signal port and second output signal port, and output end connects
Connect the second input pin of the power conditioning circuitry.
3. audio output circuit according to claim 2, which is characterized in that first filter module includes resistance
R301, resistance R302, resistance R303, resistance R304, resistance R305, resistance R306, resistance R307, capacitor C301, capacitor C302,
Capacitor C303, capacitor C304, capacitor C305, capacitor C306, the first amplifier OPA2134；
The resistance R301 first end connects first output signal port, and second end connects the resistance R303 first end,
The resistance R303 second end connects the first amplifier OPA2134 inverting input terminal, and the first amplifier OPA2134 is defeated
Outlet connects the capacitor C306 first end；The capacitor C306 second end connects first input pin, and by described
Resistance R307 ground connection；The capacitor C302 first end connects the resistance R303 second end, the capacitor C302 second end connection
The first amplifier OPA2134 output end and the resistance R304 first end；The resistance R304 second end connects the electricity
Hinder R301 second end and the capacitor C301 first end, the capacitor C301 second end ground connection；
The resistance R302 first end connects second output signal port, and second end connects the resistance R306 first end,
The resistance R306 second end connects the first amplifier OPA2134 non-inverting input terminal；The resistance R302 second end connection
The capacitor C303 first end and the resistance R305 first end, capacitor C303 second end ground connection, the resistance R305 the
Two ends are grounded by the capacitor C304；The capacitor C305 first end connects the resistance R306 second end, the capacitor
C305 second end ground connection.
4. audio output circuit according to claim 3, which is characterized in that second filter module includes resistance
R311, resistance R312, resistance R313, resistance R314, resistance R315, resistance R316, resistance R317, capacitor C311, capacitor C312,
Capacitor C313, capacitor C314, capacitor C315, capacitor C316, the second amplifier OPA2134；
The resistance R311 first end connects second output signal port, and second end connects the resistance R313 first end,
The resistance R313 second end connects the second amplifier OPA2134 inverting input terminal, and the second amplifier OPA2134 is defeated
Outlet connects the capacitor C316 first end, and the capacitor C316 second end connects second input pin and the resistance
R317 first end, the resistance R317 second end ground connection；The capacitor C312 first end connects the resistance R313 second end, institute
It states capacitor C312 second end and connects the second amplifier OPA2134 output end and the resistance R314 first end；The resistance
R314 second end connects the resistance R311 second end and the capacitor C311 first end, the capacitor C311 second end ground connection；
The resistance R312 first end connects first output signal port, and second end connects the resistance R316 first end,
The resistance R316 second end connects the second amplifier OPA2134 non-inverting input terminal；The resistance R312 second end connection
The capacitor C313 first end and the resistance R315 first end, capacitor C313 second end ground connection, the resistance R315 the
Two ends connect the capacitor C314 first end, the capacitor C314 second end ground connection；Described in the capacitor C315 first end connection
Resistance R316 second end, the capacitor C315 second end ground connection.
5. audio output circuit according to claim 1, which is characterized in that the power conditioning circuitry includes volume adjustment
Module, the volume adjusting module include chip PGA4311, and the output end of the balancing filter circuit connects the chip
The analog signal input pin 3 and pin 10 of PGA4311.
6. audio output circuit according to claim 5, which is characterized in that the power conditioning circuitry further includes that earphone is put
Big module, the earphone amplification module include the first amplifier LME49990, the second amplifier LME49990, third amplifier
LME49990, the 4th amplifier LME49600, resistance R401, resistance R402, resistance R403, resistance R404, resistance R405, resistance
R406, capacitor C403, capacitor C404；
The analog signal output pin 8 of the chip PGA4311 passes through capacitor C401 connection the first amplifier LME49990
Non-inverting input terminal, the output end of the first amplifier LME49990 connects the resistance R403 first end, the resistance
R403 second end is grounded and is connected the non-inverting input terminal of the third amplifier LME49990 by the resistance R405, and described
The output end of three amplifier LME49990 connects the pin 2 of the 4th amplifier LME49600；
The analog signal output pin 5 of the chip PGA4311 passes through capacitor C402 connection the second amplifier LME49990
Non-inverting input terminal, the output end of the second amplifier LME49990 passes through the resistance R404 connection resistance R406 the
One end, the resistance R406 second end connect the output pin 2 of the 4th amplifier LME49600；The resistance R406 first
End is also connected with the inverting input terminal of the third amplifier LME49990；
The inverting input terminal of the first amplifier LME49990 connects the output end of the first amplifier LME49990, described
The inverting input terminal of second amplifier LME49990 connects the output end of the second amplifier LME49990；First amplification
The non-inverting input terminal of device LME49990 is grounded by the resistance R401, the non-inverting input terminal of the second amplifier LME49990
It is grounded by the resistance R402.
7. audio output circuit according to claim 1, which is characterized in that the D/A converting circuit includes analog-to-digital conversion
The analog signal output pin 23 and pin 24 of device CS4398, the analog-digital converter CS4398 connect the balancing filter electricity
Road.
8. audio output circuit according to claim 7, which is characterized in that the processor circuit includes chip
TMS320C6657, the digital signal of the chip TMS320C6657 are exported to the pin 3 of the analog-digital converter CS4398.
9. a kind of fault detection circuit, which is characterized in that it includes the described in any item audio output circuits of claim 1-8.
10. fault detection circuit according to claim 9, which is characterized in that it further includes：It is defeated for receiving the audio
The selected on-off circuit of the analog audio signal of circuit output out, for the analog audio signal to be converted to digital audio letter
Number analog to digital conversion circuit；The input terminal of analog-digital conversion circuit as described is connect with the output end of the selected on-off circuit, described
The output end of analog to digital conversion circuit is connect with the input terminal of the processor circuit.
11. a kind of program request apparatus, which is characterized in that it includes the described in any item audio output circuits of claim 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820384780.8U CN208143483U (en) | 2018-03-20 | 2018-03-20 | Audio output circuit, fault detection circuit and program request apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820384780.8U CN208143483U (en) | 2018-03-20 | 2018-03-20 | Audio output circuit, fault detection circuit and program request apparatus |
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| CN208143483U true CN208143483U (en) | 2018-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242194A (en) * | 2021-06-17 | 2021-08-10 | 浙江地芯引力科技有限公司 | Connecting device, earphone and connection converter |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242194A (en) * | 2021-06-17 | 2021-08-10 | 浙江地芯引力科技有限公司 | Connecting device, earphone and connection converter |
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