CN106454641B - It can inhibit the circuit of sound accompaniment noise - Google Patents
It can inhibit the circuit of sound accompaniment noise Download PDFInfo
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- CN106454641B CN106454641B CN201610837793.1A CN201610837793A CN106454641B CN 106454641 B CN106454641 B CN 106454641B CN 201610837793 A CN201610837793 A CN 201610837793A CN 106454641 B CN106454641 B CN 106454641B
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- power amplifier
- audio power
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- primary processor
- conducting wire
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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Abstract
The invention discloses a kind of circuits that can inhibit sound accompaniment noise, including primary processor and audio power amplifier, the first conducting wire is equipped between the L channel output connector of primary processor and the L channel input positive terminal of audio power amplifier, first conducting wire is in series with first capacitor close to audio power amplifier one end, it is equipped with the second conducting wire between the ground terminal A of primary processor and the L channel input negative pole end of audio power amplifier, the second conducting wire is in series with the second capacitor close to audio power amplifier one end；Privates is equipped between the right channel output connector of primary processor and the right channel input positive terminal of audio power amplifier, privates is in series with third capacitor close to audio power amplifier one end, privates are equipped between the ground terminal B of primary processor and the right channel input negative pole end of audio power amplifier, privates are in series with the 4th capacitor close to audio power amplifier one end.The present invention solves the problems, such as that sound accompaniment ambient noise is big in electronic product, can not only substantially reduce design difficulty, but also can inhibit sound accompaniment background noise level.
Description
Technical field
The present invention relates to circuit design field more particularly to a kind of circuits that can inhibit sound accompaniment noise.
Background technique
It is related in audio or audio-video electronic product currently, there is typically at least a primary processors and a sound accompaniment
Power amplification circuit.Wherein primary processor is responsible for carrying out the processing such as demodulation, decoding and audio, volume of information source, then will
Audio signal after processed is sent to sound carrier power amplifying circuit and amplifies, and is finally sent to loudspeaker sounding.
The audio signal that above-mentioned primary processor is sent to sound carrier power amplification circuit is believed if not the number such as I2S
Number, but analog signal is amplified then audio signal easily introduces noise during PCB trace eventually by sound carrier power,
There is more serious ambient noise at loudspeaker end, influences to listen to normal audio.
In order to improve this problem, it will usually by during printing board PCB cabling, to primary processor to sound accompaniment
The analog audio signal of power amplification circuit using shorten cable run distance, the source that avoids interference, packet etc. measures.But it is practical
It is difficult to understand the lead-in path of noise in development process, or is limited by the placement position of each element, cabling etc. in PCB
Limitation, so even spending many energy to improve the introducing problem of ambient noise, but practical rectification effect is difficult to make us full
Meaning.
Summary of the invention
It is an object of the invention to overcome it is existing have analog audio signal is handled, the electronic product of enlarging function
Present in noise introduce problem, a kind of circuit can inhibit sound accompaniment noise is provided, sound accompaniment background in electronic product is solved and makes an uproar
The big problem of sound can not only substantially reduce design difficulty, but also can inhibit sound accompaniment background noise level.
The purpose of the invention is achieved by the following technical solution:
A kind of circuit can inhibit sound accompaniment noise, including primary processor and audio power amplifier, the L channel of the primary processor
Output end includes L channel output connector and ground terminal A, and the right channel output end of the primary processor includes right channel output
Connecting pin and ground terminal B, the audio power amplifier include L channel input positive terminal, L channel input negative pole end, right channel input
Positive terminal, right channel input negative pole end, and the L channel output connector of the primary processor and the L channel of audio power amplifier input
The first conducting wire is electrically connected between positive terminal, the first conducting wire is in series with first capacitor, the main process task close to audio power amplifier one end
It is electrically connected with the second conducting wire between the ground terminal A of device and the L channel input negative pole end of audio power amplifier, the second conducting wire is close to sound accompaniment
Power amplifier one end is in series with the second capacitor；The right channel output connector of the primary processor and the right channel of audio power amplifier input just
It is electrically connected with privates between extreme, privates is in series with third capacitor, the primary processor close to audio power amplifier one end
Ground terminal B and audio power amplifier right channel input negative pole end between be electrically connected with privates, privates are close to sound accompaniment function
It puts one end and is in series with the 4th capacitor；First conducting wire and the second conducting wire collectively form L channel differential output circuit, and described
Three wires and privates collectively form right channel differential output circuit；Second conducting wire is electrically connected close to the one end ground terminal A
There is ground line A, the privates are electrically connected with ground line B close to the one end ground terminal B.
In order to be better achieved the present invention, second conducting wire is in series with first resistor close to ground line location A, and described the
Four conducting wires are in series with second resistance close to ground line B location.
The present invention can inhibit sound accompaniment noise circuit lay the following steps are included:
A, the electronic product with audio processing, enlarging function, contains at least one primary processor, a sound accompaniment function
Rate amplification circuit.Primary processor is responsible for carrying out the processing such as demodulation, decoding and audio, volume of information source, then will process
Audio signal afterwards is sent to sound carrier power amplification circuit by way of analog signal and amplified；Primary processor sends out companion
Each sound channel of sound signal is single channel output, i.e., non-differential mode exports, and each sound channel of sound carrier power amplification circuit
Simulation sound accompaniment input by the way of Differential Input；
B, the analogue audio frequency output of each sound channel of primary processor described in step A is by being sent into sound carrier power after capacitive coupling
Amplification circuit corresponds to the positive input terminal of sound channel；The negative input end of each sound channel of sound carrier power amplification circuit is sequentially connected in series electricity
Hold, resistance is followed by the GND of primary processor audio-frequency unit circuit with reference to ground network；
C, the coupled capacitor that the positive and negative input port of each sound channel of sound carrier power amplification circuit is connected to described in step B abuts
Sound carrier power amplification circuit is put；The resistance for being serially connected in power amplifier negative input route is put against primary processor audio output foot
It puts；
D, the signal that the positive and negative end of analog audio signal of each sound channel of power amplifier is sent into described in step B uses difference in the pcb
Mode cabling is handled while packet is remake outside difference cabling.
The present invention compared with the prior art, have the following advantages that and the utility model has the advantages that
(1) present invention after the serial capacitance of the negative input end of each sound channel of sound carrier power amplification circuit by increasing
It is grounded again after one series resistor, and the series resistor is put beside primary processor audio output pin, so that PCB Shang couple
The simulation sound accompaniment of each sound channel can carry out difference cabling, and the mode of difference cabling can significantly inhibit in the pcb common mode make an uproar
The introducing of sound, so that simulation sound accompaniment background noise level can almost compare favourably with full digital audio power amplification.
(2) after applying the present invention, limitation of the designer in PCB design significantly reduces, and audio difference cabling completely can be with
By the region of the serious interferences such as DC-DC, influence of the track lengths to ambient noise also can almost be ignored.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Wherein, title corresponding to the appended drawing reference in attached drawing are as follows:
10- primary processor, 20- audio power amplifier, 30- L channel differential output circuit, 40- right channel difference output electricity
Road.
Specific embodiment
The present invention is described in further detail below with reference to embodiment:
Embodiment
As shown in Figure 1, a kind of circuit that can inhibit sound accompaniment noise, including primary processor 10 and audio power amplifier 20, main process task
Device 10 is responsible for carrying out the processing such as demodulation, decoding and audio, volume of information source, and the audio signal after then processing passes through simulation
The mode of signal is sent to audio power amplifier 20 and amplifies.Each sound channel that primary processor 10 sends out audio signal is that single channel is defeated
Out, i.e., non-differential mode exports；And the simulation sound accompaniment of each sound channel of audio power amplifier 20 inputs by the way of Differential Input.
The L channel output end of primary processor 10 includes that (the first of primary processor 10 connects L channel output connector in Fig. 1
Line end, Lout terminals) and ground terminal A (the third terminals of primary processor 10, GND terminals in Fig. 1), primary processor 10
Right channel output end includes right channel output connector (the second terminals of primary processor 10, Rout terminals in Fig. 1) and ground
Line end B (the 4th terminals of primary processor 10, GND terminals in Fig. 1), audio power amplifier 20 include that L channel inputs positive terminal
(the first terminals of audio power amplifier 20, Lin+ terminals in Fig. 1), L channel input negative pole end (the of audio power amplifier 20 in Fig. 1
Two terminals, Lin- terminals), right channel input positive terminal (the third terminals of audio power amplifier 20, Lin+ wiring in Fig. 1
End), right channel input negative pole end (the 4th terminals of audio power amplifier 20, Lin- terminals in Fig. 1), the left sound of primary processor 10
It is electrically connected with the first conducting wire between the L channel of road output connector and audio power amplifier 20 input positive terminal, the first conducting wire is close to companion
20 one end of sound power amplifier is in series with first capacitor (CA1 in Fig. 1), the ground terminal A of primary processor 10 and the L channel of audio power amplifier 20
It is electrically connected with the second conducting wire between input negative pole end, the second conducting wire is in series with the second capacitor (in Fig. 1 close to 20 one end of audio power amplifier
CA2)；The is electrically connected between the right channel of the right channel output connector of primary processor 10 and audio power amplifier 20 input positive terminal
Three wires, privates are in series with third capacitor (CA3 in Fig. 1), the ground terminal B of primary processor 10 close to 20 one end of audio power amplifier
Privates are electrically connected between the right channel input negative pole end of audio power amplifier 20, privates are close to 20 one end of audio power amplifier
It is in series with the 4th capacitor (CA4 in Fig. 1)；First conducting wire and the second conducting wire collectively form L channel differential output circuit 30, third
Conducting wire and privates collectively form right channel differential output circuit 40；Second conducting wire is electrically connected with close to the one end ground terminal A and connects
Ground wire A, privates are electrically connected with ground line B close to the one end ground terminal B.
The analogue audio frequency of the left and right sound channels of primary processor 10 passes through (or the Lout wiring of L channel output connector respectively
End), right channel output connector (or Rout terminals) output, and respectively by concatenation first capacitor CA1, third capacitor CA3
L channel input positive terminal (LIN+ terminals) of the corresponding sound channel of audio power amplifier 20 is sent into after coupling, right channel inputs positive terminal
(RIN+ terminals)；Each sound channel negative input end of audio power amplifier 20 concatenates the second capacitor CA2, the 4th capacitor CA4, the second capacitor respectively
CA2, the 4th capacitor CA4 other end connect with first resistor RA1, second resistance RA2 respectively, first resistor RA1, second resistance
Another GND for terminating to 10 audio-frequency unit circuit of primary processor of RA2 is with reference to ground network.In PCB design, it is connected to sound carrier power and puts
Coupling first capacitor CA1, the second capacitor CA2, third capacitor CA3, the 4th electricity of the positive and negative input port of big each sound channel of integrated circuit
Hold CA4 to put against the corresponding input pin of audio power amplifier 20；It is serially connected in first resistor RA1, the second electricity of power amplifier negative input route
Resistance RA2 is put against 10 audio output foot of primary processor.It is sent into the signal at the positive and negative end of analog audio signal of each sound channel of power amplifier
Differential mode cabling is used in the pcb, is handled while packet is remake outside difference cabling.
Second conducting wire is in series with first resistor (RA1 in Fig. 1) close to ground line location A, and privates are close to ground line B
It sets and is in series with second resistance (RA2 in Fig. 1).
The present invention is believed the analogue audio frequency between primary processor 10 and audio power amplifier 20 by above-mentioned circuit design method
Number transmission is changed to differential transfer by single-ended transmission, then is handled by packet ground outside differential lines, and each channel analogy sound accompaniment is in PCB
The noise introduced during cabling can balance out in 20 input terminal of audio power amplifier because each sound channel negative terminal is equally introduced, make
Sound accompaniment background noise level must be simulated can almost compare favourably with full digital audio power amplification.After applying the present invention, designer sets in PCB
Limitation in meter significantly reduces, and audio difference cabling completely can be by the region of all kinds of serious interferences such as DC-DC, track lengths
Influence to ambient noise also can almost be ignored.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. a kind of circuit that can inhibit sound accompaniment noise, it is characterised in that: described including primary processor (10) and audio power amplifier (20)
The L channel output end of primary processor (10) includes L channel output connector and ground terminal A, the right side of the primary processor (10)
Sound channel output end includes right channel output connector and ground terminal B, the audio power amplifier (20) include L channel input positive terminal,
L channel inputs negative pole end, right channel input positive terminal, right channel and inputs negative pole end, and the L channel of the primary processor (10) is defeated
It is electrically connected with the first conducting wire between the L channel of connecting pin and audio power amplifier (20) input positive terminal out, the first conducting wire is close to sound accompaniment
Power amplifier (20) one end is in series with first capacitor, and the ground terminal A and the L channel of audio power amplifier (20) of the primary processor (10) are defeated
Enter and be electrically connected with the second conducting wire between negative pole end, the second conducting wire is in series with the second capacitor close to audio power amplifier (20) one end；It is described
The is electrically connected between the right channel of the right channel output connector of primary processor (10) and audio power amplifier (20) input positive terminal
Three wires, privates are in series with third capacitor close to audio power amplifier (20) one end, the ground terminal B of the primary processor (10) with
Privates are electrically connected between the right channel input negative pole end of audio power amplifier (20), privates are close to audio power amplifier (20) one
End is in series with the 4th capacitor；First conducting wire and the second conducting wire collectively form L channel differential output circuit (30), and described
Three wires and privates collectively form right channel differential output circuit (40)；Second conducting wire is close to the one end ground terminal A electricity
It is connected with ground line A, the privates are electrically connected with ground line B close to the one end ground terminal B.
2. the circuit described in accordance with the claim 1 that can inhibit sound accompaniment noise, it is characterised in that: second conducting wire is close to ground connection
Line location A is in series with first resistor, and the privates are in series with second resistance close to ground line B location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610837793.1A CN106454641B (en) | 2016-09-21 | 2016-09-21 | It can inhibit the circuit of sound accompaniment noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610837793.1A CN106454641B (en) | 2016-09-21 | 2016-09-21 | It can inhibit the circuit of sound accompaniment noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106454641A CN106454641A (en) | 2017-02-22 |
| CN106454641B true CN106454641B (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610837793.1A Active CN106454641B (en) | 2016-09-21 | 2016-09-21 | It can inhibit the circuit of sound accompaniment noise |
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| CN111200775B (en) * | 2018-11-19 | 2021-03-05 | 广州汽车集团股份有限公司 | Audio interface circuit, circuit group, automobile and audio access method |
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| CN201349272Y (en) * | 2008-12-22 | 2009-11-18 | 康佳集团股份有限公司 | CRT television mute control circuit |
| CN202111843U (en) * | 2011-06-07 | 2012-01-11 | 广州飞达音响专业器材有限公司 | Sound for suppressing TDMA noises |
| CN103826185B (en) * | 2014-03-07 | 2017-02-08 | 深圳市晶科源科技有限公司 | Natural sound effect processing circuit |
| US9883285B1 (en) * | 2014-12-23 | 2018-01-30 | Revx Technologies | Sound quality device and system |
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