CN209105420U - A kind of audio output circuit and audio frequency apparatus - Google Patents
A kind of audio output circuit and audio frequency apparatus Download PDFInfo
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- CN209105420U CN209105420U CN201821117412.3U CN201821117412U CN209105420U CN 209105420 U CN209105420 U CN 209105420U CN 201821117412 U CN201821117412 U CN 201821117412U CN 209105420 U CN209105420 U CN 209105420U
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Abstract
A kind of audio output circuit, comprising: the main control chip of output audio signal, the audio power amplifying circuit of power amplification is carried out to audio signal, earphone output circuit for connecting the horn interface of loudspeaker and for exporting from audio signal to earphone load, control whether power amplification circuit exports amplified audio signal using the voltage signal of main control chip test earphone output circuit, and according to voltage signal.Audio signal input by the way that earphone output circuit is arranged, which is directly connect with main control chip, requires no audio power amplifying circuit, solve the problems, such as that bottom is made an uproar because being further magnified by audio power amplifying circuit, it can make an uproar to avoid the bottom of audio power amplifying circuit and bring earphone into, it makes an uproar to reduce earphone bottom, common material can be used in capacitance and divider resistance simultaneously, reduce product cost, furthermore, in Design PCB plate, it is not influenced by the positional relationship of power amplification circuit and earphone socket, improves the flexibility of pcb board layout.
Description
Technical field
The utility model belongs to voicefrequency circuit technical field more particularly to a kind of audio output circuit and audio frequency apparatus.
Background technique
Currently, the audio signal of earphone output circuit is defeated to earphone again after exporting from main control chip to power amplification circuit
Enter, still, generated bottom is made an uproar and can be further magnified after power amplification circuit when main control chip works, so that earphone
Bottom make an uproar than more serious, usually by increase by two resistance it is in parallel with earphone load to reduce the amplitude that earphone bottom is made an uproar；Secondly, by
DC level signal is contained in the output signal of power amplification circuit, and finds direct current ordinary mail according to actual measured results
Number amplitude it is higher so that earphone input circuit can only select the capacitance of 16V pressure voltage and the divider resistance of 820 Ω, but
It is that the capacitor of this type and the price of resistance are more expensive, increases design cost；In addition, traditional design causes power amplification electric
Road cannot be too far from earphone stand, so as to limit to the position of power amplification circuit when Design PCB plate, to make design flexibility
It is low.
Therefore, it is high and at high cost to have that earphone output bottom is made an uproar for the audio output circuit in traditional technical solution.
Utility model content
The utility model provides a kind of audio output circuit, it is intended to solve the audio output circuit in traditional technical solution
It is high and at high cost to there is a problem of that earphone output bottom is made an uproar.
The utility model is realized in this way a kind of audio output circuit, comprising:
The main control chip of output audio signal；
It is connect with the main control chip output end, the Audio power amplifier electricity of power amplification is carried out to the audio signal
Road；
It is connect with the audio power amplifying circuit output end, for connecting the horn interface of loudspeaker；And
It is connect with the main control chip output end, the earphone for exporting the audio signal to earphone load exports electricity
Road；
Wherein, the main control chip detects the voltage signal of the earphone output circuit, and according to the voltage signal control
Make whether the power amplification circuit exports the amplified audio signal.
When the main control chip detects that the voltage signal is low level in one of the embodiments, described in control
Audio power amplifying circuit exports the amplified audio signal to horn interface；The main control chip detects the voltage
When signal is high level, controls the audio power amplifying circuit and close to the amplified audio letter of horn interface output
Number.
The earphone output circuit includes: with L channel terminal, right channel terminal and ground in one of the embodiments,
The earphone socket of terminal；It is connected between the first audio signal output end of the main control chip and the L channel terminal, uses
In the first blocking bleeder circuit of blocking partial pressure；Be connected to the main control chip the second audio signal output end and with the right side
The second blocking bleeder circuit between sound channel terminal, for blocking partial pressure；Be connected to the main control chip voltage detection terminal and
Between the L channel terminal or right channel terminal, the voltage for detecting the L channel terminal or right channel terminal is believed
Number earphone detection circuit.
The first blocking bleeder circuit includes: the first audio with the main control chip in one of the embodiments,
Signal output end connection, the first capacitor for blocking；It is connected between the first capacitor and the right channel terminal, is used for
The first resistor of partial pressure.
The first blocking bleeder circuit in one of the embodiments, further include: be connected to the right channel terminal and
Second resistance between ground, for partial pressure.
The second blocking bleeder circuit includes: the second audio with the main control chip in one of the embodiments,
Signal output end connection, the second capacitor for blocking；It is connected between second capacitor and the L channel terminal, is used for
The 3rd resistor of partial pressure.
The earphone detection circuit includes: the voltage detecting for being connected to the main control chip in one of the embodiments,
Between end and the L channel terminal or right channel terminal, the 4th resistance for the 4th resistance of partial pressure, for partial pressure；Connection
Between the 4th resistance and ground, for buffering the third capacitor of transient voltage signals.
The earphone socket is 5 stitch earphone sockets in one of the embodiments,.
In addition, a kind of audio frequency apparatus is additionally provided, including above-mentioned audio output circuit.
Above-mentioned audio output circuit, by audio signal input and Audio power amplifier electricity that earphone output circuit is arranged
The audio signal input on road is connect with main control chip, and is believed by the upper piezoelectric voltage of main control chip test earphone output circuit
Number, and control whether audio power amplifying circuit exports amplified audio signal according to the low and high level of voltage signal, it can be with
Realize insertion earphone when loudspeaker do not export, when being not inserted into earphone loudspeaker export, meanwhile, earphone output circuit directly with master control core
The audio signal output end of piece connects, and solves the problems, such as that bottom is made an uproar and is further magnified because passing through audio power amplifying circuit, from
And the bottom for reducing earphone is made an uproar, in addition, in Design PCB plate, not by the positional relationship of power amplification circuit and earphone socket
It influences, improves the flexibility of pcb board layout.
Detailed description of the invention
Fig. 1 is the module diagram of audio output circuit provided by the embodiment of the utility model；
Fig. 2 is the module diagram for the earphone output circuit that an embodiment of the present invention provides；
Fig. 3 is the circuit diagram for the earphone output circuit that an embodiment of the present invention provides；
Fig. 4 is the circuit diagram for the audio power amplifying circuit that an embodiment of the present invention provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 shows the module diagram of the audio output circuit of the utility model preferred embodiment offer, for the ease of
Illustrate, only the parts related to this embodiment are shown, and details are as follows:
With reference to Fig. 1, a kind of audio output circuit, comprising: main control chip 40, audio power amplifying circuit 10, earphone output
Circuit 20 and horn interface 30.
Wherein, main control chip 40 is used for output audio signal；The output of audio power amplifying circuit 10 and main control chip 40
End connection carries out power amplification to audio signal；Horn interface is connect with 10 output end of audio power amplifying circuit, for connecting
Loudspeaker；Earphone output circuit 20 is connect with the output end of main control chip 40, for exporting audio signal to earphone load；Its
In, the voltage signal of 40 test earphone output circuit of main control chip, and whether power amplification circuit 10 is controlled according to voltage signal
Export amplified audio signal.
Fig. 4 is referred in one of the embodiments, when main control chip 40 detects that voltage signal is low level, controls sound
Frequency power amplification circuit 10 exports amplified audio signal to horn interface 30；Main control chip 40 detects voltage signal for height
When level, control audio power amplifying circuit 10, which is closed to horn interface 30, exports amplified audio signal, and earphone is defeated at this time
Circuit 20 is to earphone load output audio signal out.
As above-mentioned, earphone output circuit is directly connected to the audio signal output end of main control chip 40, and requires no sound
Frequency power amplification circuit 10 solves the problems, such as that bottom is made an uproar because being further magnified by audio power amplifying circuit 10, while
The bottom for avoiding audio power amplifying circuit, which is made an uproar, brings earphone into, so that the bottom for reducing earphone is made an uproar, it is convenient to omit one connects with ground
It connects and the resistance of resistance value 1K Ω, has saved cost；And in Design PCB plate, power amplification circuit 40 and earphone without limitations
The influence of the positional relationship of socket improves the flexibility of pcb board layout.In addition, passing through setting 40 test earphone of main control chip
Output circuit powers on voltage signal, by voltage signal control audio power amplifying circuit 10 whether output audio signal, can
Loudspeaker do not export when being inserted into earphone to realize, loudspeaker export when being not inserted into earphone.
Fig. 2 and 3 is referred in one of the embodiments, and earphone output circuit 20 includes: earphone socket 204, the first blocking
Bleeder circuit 201, the second blocking bleeder circuit 202 and earphone detection circuit 203.
Wherein, earphone socket 204 has L channel terminal including third elastic slice including the second elastic slice 2 and the 4th elastic slice 4
3 and the 5th elastic slice 5 right channel terminal and ground terminal 1；First blocking bleeder circuit 201 is connected to the first sound of main control chip 40
Between frequency signal output end AOUT1L and L channel terminal (the second elastic slice 2 or the 4th elastic slice 4), divided for blocking；Second every
Straight bleeder circuit 202 be connected to main control chip 40 the second audio signal output end AOUT1R and with right channel terminal (third bullet
Piece 3 or the 5th elastic slice 5) between, it is divided for blocking；Earphone detection circuit 203 is connected to the voltage detection terminal of main control chip 40
Between STB and L channel terminal (the second elastic slice 2 or the 4th elastic slice 4) or right channel terminal (third elastic slice 3 or the 5th elastic slice 5),
For detecting L channel terminal (the second elastic slice 2 or the 4th elastic slice 4) or right channel terminal (third elastic slice 3 or the 5th elastic slice 5)
Voltage signal.In the present embodiment, earphone socket 204 is 5 stitch earphone sockets, and the earphone by the way that the present embodiment is arranged exports electricity
Road 20 can use 5 stitch earphone sockets, reduce production cost relative to 7 pin receptacles.
Fig. 3 is referred in one of the embodiments, and the first blocking bleeder circuit 201 includes the electricity of first capacitor C1 and first
R1 is hindered, first capacitor C1 is connect with the first audio signal output end AOUT1L of main control chip 40, is used for blocking；First resistor R1
It is connected between first capacitor C1 and L channel terminal (the second elastic slice 2 or the 4th elastic slice 4), for dividing.Due to defeated to earphone
The bottom of the audio signal of the input of circuit 20 is made an uproar low out, and first resistor R1 and first capacitor C1 can select common material, can drop
Low product cost.In the present embodiment, the first blocking bleeder circuit 201 is connected to the first audio signal output end AOUT1L and
Between two elastic slices 2, the 5th elastic slice 4 of L channel terminal is hanging；In other embodiments, it can be reversed.
Fig. 3 is referred in one of the embodiments, and the second blocking bleeder circuit 202 includes the second capacitor C2 and third electricity
R3 is hindered, the second capacitor C2 is connect with the second audio signal output end AOUT1R of main control chip 40, is used for blocking；3rd resistor R3
It is connected between the second capacitor C2 and right channel terminal (third elastic slice 3 or the 5th elastic slice 5), for dividing.Due to defeated to earphone
The bottom of the audio signal of the input of circuit 20 is made an uproar low out, and 3rd resistor R3 and the second capacitor C2 can select common material, reduce
Product cost.In the present embodiment, the second blocking bleeder circuit 202 is connected to the second audio signal output end AOUT1R and third
Between elastic slice 3；In other embodiments, it can be reversed.
Fig. 3 is referred in one of the embodiments, and the second blocking bleeder circuit 202 further includes second resistance R2, the second electricity
Resistance R2 is connected between right channel terminal (third elastic slice 3 or the 5th elastic slice 5) and ground, for dividing, in the present embodiment, second
Resistance R2 can pass through multiple resistor in series or composition in parallel.
Fig. 3 is referred in one of the embodiments, earphone detection circuit 203 includes the 4th resistance R4 and third capacitor C3,
4th resistance R4 be connected to main control chip 40 voltage detection terminal STB and L channel terminal (the second elastic slice 2 or the 4th elastic slice 4) or
Between right channel terminal (third elastic slice 3 or the 5th elastic slice 5), for dividing；Third capacitor C3 is connected to the 4th resistance R4 and ground
Between, for buffering transient voltage signals.In the present embodiment, earphone detection circuit 203 is connected to voltage detection terminal STB and right sound
Between 5th elastic slice 5 of road terminal；In other embodiments the 5th elastic slice 5 can be substituted for the second elastic slice 2, the 4th elastic slice 4 or
Third elastic slice 3.
Below to be illustrated shown in Fig. 1 and 3 to the working principle of audio output circuit, details are as follows:
When earphone socket 204 is inserted into earphone, the third stitch 3 and the 5th stitch 5 of earphone socket 204 are disconnected, main
The voltage detection terminal STB of control chip 40 detects the voltage signal of the headset detection end EAR_DET of earphone output circuit 20 for height
Level, control audio power amplifying circuit, which is closed to horn interface, exports amplified audio signal, at this time earphone output circuit
20 to earphone input audio signal.
When earphone socket 204 is not inserted into earphone, the third stitch 3 of earphone socket 204 and the connection of the 5th stitch 5, at this time
The voltage detection terminal STB of main control chip 40 detects that the voltage signal of the headset detection end EAR_DET of earphone output circuit 20 is
Low level, control audio power amplifying circuit normally export amplified audio signal to horn interface.
In addition, also providing a kind of audio frequency apparatus, which includes above-mentioned audio output circuit.
The utility model has the beneficial effects that
1, by the way that the audio signal input of earphone output circuit and the audio signal input of audio power amplifying circuit is arranged
Be connected to the audio signal output end of main control chip so that the audio input of earphone output circuit directly with the sound of main control chip
The connection of frequency signal output end solves the problems, such as that bottom is made an uproar because being further magnified by audio power amplifying circuit, while also keeping away
The bottom for having exempted from audio power amplifying circuit, which is made an uproar, brings earphone into, and the bottom for reducing earphone is made an uproar.
2, common material can be used in capacitance and divider resistance, and can make the earphone socket for selecting 5 stitch,
Reduce product cost.
3, in Design PCB plate, it can not be influenced, be improved by the positional relationship of power amplification circuit and earphone socket
The flexibility of pcb board layout.
4, voltage signal is powered on by the voltage detection terminal test earphone output circuit of main control chip, and is believed according to voltage
Number low and high level control audio power amplifying circuit whether export amplified audio signal, may be implemented insertion earphone when loudspeaker
Do not export, when being not inserted into earphone loudspeaker export.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (7)
1. a kind of audio output circuit, which is characterized in that the audio output circuit includes:
Main control chip for output audio signal；
It is connect with the output end of the main control chip, the audio power amplifying circuit of power amplification is carried out to the audio signal；
It is connect with the output end of the audio power amplifying circuit, for connecting the horn interface of loudspeaker；And
It is connect with the output end of the main control chip, the earphone for exporting the audio signal to earphone load exports electricity
Road；
Wherein, the earphone output circuit includes:
Earphone socket with L channel terminal, right channel terminal and ground terminal；
It is connected between the first audio signal output end of the main control chip and the L channel terminal, for blocking partial pressure
First blocking bleeder circuit；
It is connected to the second audio signal output end of the main control chip and between the right channel terminal, is divided for blocking
The second blocking bleeder circuit；And
It is connected between the voltage detection terminal of the main control chip and the L channel terminal or right channel terminal, for detecting
State the earphone detection circuit of the voltage signal of L channel terminal or right channel terminal；
The main control chip detects the voltage signal of the earphone output circuit, and according to voltage signal control
Whether power amplification circuit exports the amplified audio signal.
2. audio output circuit as described in claim 1, which is characterized in that the first blocking bleeder circuit includes:
It is connect with the first audio signal output end of the main control chip, the first capacitor for blocking；With
It is connected between the first capacitor and the right channel terminal, the first resistor for partial pressure.
3. audio output circuit as claimed in claim 2, which is characterized in that the second blocking bleeder circuit includes:
It is connect with the second audio signal output end of the main control chip, the second capacitor for blocking；With
It is connected between second capacitor and the L channel terminal, the 3rd resistor for partial pressure.
4. audio output circuit as claimed in claim 3, which is characterized in that the second blocking bleeder circuit further include:
It is connected between the right channel terminal and ground, the second resistance for partial pressure.
5. audio output circuit as described in claim 1, which is characterized in that the earphone detection circuit includes:
It is connected between the voltage detection terminal of the main control chip and the L channel terminal or right channel terminal, for partial pressure
4th resistance；With
It is connected between the 4th resistance and ground, for buffering the third capacitor of transient voltage signals.
6. audio output circuit as described in claim 1, which is characterized in that the earphone socket is 5 stitch earphone sockets.
7. a kind of audio frequency apparatus, which is characterized in that including audio output circuit as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821117412.3U CN209105420U (en) | 2018-07-13 | 2018-07-13 | A kind of audio output circuit and audio frequency apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821117412.3U CN209105420U (en) | 2018-07-13 | 2018-07-13 | A kind of audio output circuit and audio frequency apparatus |
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| CN209105420U true CN209105420U (en) | 2019-07-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113448531A (en) * | 2021-06-10 | 2021-09-28 | 杭州小派智能科技有限公司 | Loudspeaker and earphone interface self-adaption method and system and virtual reality equipment |
-
2018
- 2018-07-13 CN CN201821117412.3U patent/CN209105420U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113448531A (en) * | 2021-06-10 | 2021-09-28 | 杭州小派智能科技有限公司 | Loudspeaker and earphone interface self-adaption method and system and virtual reality equipment |
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