CN107809702A - Signal output apparatus - Google Patents
Signal output apparatus Download PDFInfo
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- CN107809702A CN107809702A CN201710940417.XA CN201710940417A CN107809702A CN 107809702 A CN107809702 A CN 107809702A CN 201710940417 A CN201710940417 A CN 201710940417A CN 107809702 A CN107809702 A CN 107809702A
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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
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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
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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Abstract
The invention discloses a kind of signal output apparatus, including audio processing chip, audio output circuit, power amplifier chips, protection circuit and the power amplifier socket sequentially connected, wherein, audio processing chip is used to after the audio signal of acquisition is changed export；Audio output circuit is used to input the audio output signal of audio processing chip output to power amplifier chips；Power amplifier chips; it is also connected with a biasing circuit; biasing circuit, which is used to input to the audio output signal in power amplifier chips, carries out difference processing; power amplifier chips export after the audio output signal after difference processing is carried out into power amplification; and transmitted after protection circuit to the broadcast unit of power amplifier socket access, to drive broadcast unit to carry out the broadcasting of audio signal；Protection circuit is used to eliminate the electrostatic and surge phenomenon on broadcast unit and power amplifier chips.Signal output apparatus proposed by the present invention solves the problems, such as unstable during existing audio signal output.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of signal output apparatus.
Background technology
With the development people's living standards continue to improve in epoch, also more and more frequently, chip refers to for the use of chip
The silicon chip of integrated circuit is included, its volume very little, often a part for computer or other electronic equipments, chip are also referred to as micro-
Circuit, microchip and integrated circuit, the species of chip is quite varied, and wherein in audio-frequence player device, for audio signal
The use of the audio processing chip and audio-frequency power amplifier of processing and amplification output is particularly frequent.
At present, audio processing chip and audio-frequency power amplifier be often combined using with realize the reception of audio signal with
And output plays, wherein audio processing chip is used for the analog signal or data signal for receiving input, and is changed after being handled
For data signal or analog signal output, and the signal of output is inputted to audio-frequency power amplifier, pass through Audio power amplifier
Device realizes the amplification of signal, finally the output of audio signal is realized in the output end of audio-frequency power amplifier, with controlling loudspeaker
The sounding of part.
However, in the practical application of audio-frequence player device, usually due to electrostatic interference, surge impact and Voltage Drop
The loudspeaker and audio-frequency power amplifier of output end are caused to damage etc. factor.And audio-frequency power amplifier is playing on or off
During closing, audio transients signal can produce strange Transient Noise in loudspeaker, thus existing audio-frequence player device by
In the influence of the factors such as electrostatic, its audio signal is not sufficiently stable in output.
The content of the invention
Based on this, it is an object of the invention to propose a kind of signal output apparatus, solve when existing audio signal exports not
The problem of stable.
The present invention provides a kind of signal output apparatus, and concrete technical scheme is as follows：
A kind of signal output apparatus, including sequentially connect audio processing chip, audio output circuit, power amplifier chips, guarantor
Protection circuit and power amplifier socket, wherein,
The audio processing chip is used to after the audio signal of acquisition is changed export；
The audio output circuit is used to input the audio output signal that the audio processing chip exports to the work(
Put chip；
The power amplifier chips, are also connected with a biasing circuit, and the biasing circuit is used to input into the power amplifier chips
The audio output signal carry out difference processing, the power amplifier chips by after difference processing the audio output signal carry out
Export after power amplification, and transmitted after the protection circuit to the broadcast unit of power amplifier socket access, with described in driving
Broadcast unit carries out the broadcasting of the audio signal；
The protection circuit is used to eliminate the broadcast unit and electrostatic and surge phenomenon on the power amplifier chips.
Signal output apparatus provided by the invention, MIC signals, differential mode sound can be realized by the audio processing chip of setting
The input of at least one of frequency signal, common mode audio signal audio signal, and exported after processing converts, and the audio exported
Output signal can isolate noise, its power supply circuit and biasing circuit are provided with matching in audio output circuit with filtering clutter
Electric capacity and resistance, noise can be isolated, the effect such as filtering clutter and decoupling so that input does not have into the signal of power amplifier chips
Noisy interference, and power amplifier chips in signal output due to the setting of protection circuit so that it is defeated after power amplification
Noise is isolated in the audio signal gone out, has eliminated the interference of electrostatic so that when its broadcast unit accesses to power amplifier socket, avoided
Because electrostatic and surge damage to caused by broadcast unit and power amplifier chips, while the output audio letter that can stablize
Number, wherein because power amplifier chips are by the way of Differential Input and difference output so that inhibit the interference of noise, solve
The problem of unstable during existing audio signal output.
In addition, according to signal output apparatus provided by the invention, there can also be technical characteristic additional as follows：
Further, the signal output apparatus also includes the control circuit being connected with the power amplifier chips and power supply electricity
Road, the control circuit are used for the working condition for controlling the power amplifier chips, and it is the power amplifier chips that the power supply circuit, which is used for,
Power supply.
Control circuit and power supply circuit by setting can be that power amplifier chips are powered and controlled power amplifier chips
Working condition, can be by setting control circuit output to the level of power amplifier chips to turn when needing power amplifier chips to be operated
It is changed to high level.
Further, the audio processing chip include MIC signal input groups pin, audio signal input group pin, with
And audio signal output group pin；
The MIC signals input group pin includes MIC biasings pin, MIC signals input positive pin and MIC signals input
Negative pin, the MIC signals input positive pin and connect the first electric capacity, and the negative pin of MIC signals input connects the second electric capacity；
The audio signal input group pin includes drawing for the signal positive input pin and signal negative input of Differential Input
Pin, the signal input pin for common mode input and the L channel input pin for the input of left and right sound channels signal and right sound
Road input pin；
The audio signal output group pin includes left channel signals output pin and right-channel signals output pin；
The differential signal or the audio signal that the audio processing chip inputs the MIC signals input group pin are defeated
Enter group audio signal of pin input and be converted to the audio output signal, and it is defeated by the audio signal output group pin
Go out.
By the first electric capacity of setting and the second electric capacity can when MIC signals access to MIC signals input group pin after
From the effect of direct current, multigroup different types of audio signal can be obtained by the audio processing chip of setting and inputted, and work as and obtain
When getting any type of audio signal input, the simulated audio signal of acquisition can be converted to digital audio and video signals, Ran Houtong
Cross audio signal output group pin and carry out audio signal output.
Further, the power amplifier chips include enabled pin, bypass pin, the positive pin of audio signal input, audio letter
Number negative pin of input, audio amplification signal export positive pin, power pins, grounding leg and audio amplification signal output is negative draws
Pin, the enabled pin are connected with the control circuit, the bypass pin and the audio signal input positive pin with it is described
Biasing circuit is connected, and the negative pin of audio signal input is connected with the audio output circuit, the power pins with it is described
Power supply circuit connects, and the audio amplification signal exports positive pin and the negative pin of audio amplification signal output and the protection
Circuit connects, the grounding leg ground connection.
Further, the audio output circuit includes left audio output circuit and right audio channel output circuit；
The left audio output circuit includes the first resistor being sequentially connected with the left channel signals output pin
With the 3rd electric capacity；
The right audio channel output circuit includes the second resistance being sequentially connected with the right-channel signals output pin
With the 4th electric capacity；
The other end of 3rd electric capacity and the 4th electric capacity inputs negative pin with the audio signal and is connected.
Feedback and current limliting can be played a part of in circuit by the first resistor and second resistance of setting, and passed through
Set the size of the resistance of first resistor and second resistance to adjust the size of current of audio output circuit, pass through the of setting
The direct current signal that three electric capacity and the 4th electric capacity can isolate in audio output circuit, to isolate noise.
Further, the protection circuit includes the positive protection circuit of signal output and signal output bears protection circuit；
The positive protection circuit of signal output include with the audio amplification signal export the 6th resistance that positive pin is connected,
The first double diode, the first electrostatic impedor and the power amplifier socket being connected with the other end of the 6th resistance, described first
One end ground connection of double diode, the other end of first double diode are connected with the power pins, the first electrostatic resistance
The other end ground connection of anti-device；
The signal output, which bears protection circuit, to be included exporting the 7th resistance that negative pin be connected and the with audio amplification signal
The second double diode, the second electrostatic impedor and the power amplifier socket of the other end connection of seven resistance, described second pair two
One end ground connection of pole pipe, the other end of second double diode are connected with the power pins, second electrostatic impedor
Other end ground connection, the power amplifier socket is used for accommodating and accesses and outside insert the broadcast unit.
Voltage clamping can be realized by the first double diode and the second double diode of setting, signal output can just protected
Voltage clamp is quiet by the first electrostatic impedor of setting and second between 0 to power pins output voltage on protection circuit
Electrical impedance device can realize Electro-static Driven Comb, to prevent electrostatic interference and electrostatic breakdown electronic component, realize protection electronic component
Effect, can be with by the first double diode of setting, the second double diode, the first electrostatic impedor and the second electrostatic impedor
Realizing prevents the phenomenon of electrostatic and surge in power amplifier socket, when avoiding the broadcast unit from accessing power amplifier socket, due to electrostatic and
Infringement of the surge to broadcast unit and power amplifier chips.
Further, the control circuit includes 3rd resistor and the 4th resistance being connected respectively with the enabled pin,
The other end ground connection of the 3rd resistor, the other end of the 4th resistance and the controlling switch of process chip connect, the work(
Put the level height that chip exports according to the controlling switch and control its working condition.
It is applied in combination by the 3rd resistor and the 4th resistance of setting and allows to play a part of partial pressure, and process chip
By controlling the level height that controlling switch exports to realize the working condition of control power amplifier chips.It is exported when controlling switch
Level when being high level, the level for enabling pin also be high level, now power amplifier chips start-up operation, by audio output circuit
Audio signal be amplified after transmit to broadcast unit to realize the broadcasting of audio.When the level of controlling switch output is low electricity
Usually, power amplifier chips are stopped.
Further, the biasing circuit includes the 5th electric capacity being connected with the bypass pin and the audio signal
Input the 6th electric capacity and the 5th resistance that positive pin is sequentially connected, the other end ground connection of the 5th electric capacity and the 5th resistance.
The clutter in the audio signal of prime input can be filtered out by the 5th electric capacity of setting, passes through the 5th electricity of setting
Resistance can realize the effect of current limliting, can be with the effect of isolated DC by the 6th electric capacity of setting, and biasing circuit and audio are defeated
Going out that circuit realizes in power amplifier chips can be with Differential Input.
Further, the power supply circuit includes being connected with the power pins respectively the 7th electric capacity, the 8th electric capacity, the
Nine electric capacity, the tenth electric capacity and magnetic bead, the 7th electric capacity, the 8th electric capacity, the other end ground connection of the 9th electric capacity and the tenth electric capacity,
The other end of the magnetic bead is connected with system power supply power supply.
The high-frequency noise in power supply can be filtered out by the magnetic bead of setting, can by the 7th electric capacity of setting and the 9th electric capacity
To play a part of DC filtering, its its simultaneously with the use of when can filter out low-and high-frequency clutter, pass through the 8th electric capacity of setting
Decoupling can be realized with being applied in combination for the 9th electric capacity, it can will cause voltage pulsation caused by power supply to be gone due to partial circuit
Remove, avoid voltage pulsation so that various pieces circuit interferes with each other.
Signal output apparatus provided by the invention, it can realize that MIC signals, differential mode audio are believed by audio processing chip
Number, the input of at least one of common mode audio signal audio signal, and exported after processing converts, and MIC signal input groups
Electric capacity is connected with before pin access MIC, can be with the interference of isolated DC signal, and the audio output signal exported is defeated in audio
Go out in circuit due to setting electric capacity and resistance to isolate noise, its power supply circuit and biasing circuit due to setting with filtering clutter
The electric capacity and resistance of matching so that noise, the effect such as filtering clutter and decoupling so that input to power amplifier chips can be isolated
Do not have noisy interference in signal, and resistance that power amplifier chips are set due to protection circuit in signal output, double diode with
And electrostatic impedor so that isolated noise in the audio signal of the output after power amplification, and clamped down on output
The scope of voltage and the interference for preventing electrostatic so that when its broadcast unit accesses to power amplifier socket, avoid due to electrostatic
And surge damages to caused by broadcast unit and power amplifier chips, while the exports audio signal that can stablize, wherein due to
Power amplifier chips are by the way of Differential Input and difference output so that inhibit the interference of noise, solve existing audio letter
Number output when it is unstable the problem of.
Brief description of the drawings
Fig. 1 is the structural representation for the signal output apparatus that one embodiment of the invention proposes.
Fig. 2 is that the circuit in the signal output apparatus that one embodiment of the invention proposes with audio processing chip coupling part shows
It is intended to.
Fig. 3 is that the circuit in the signal output apparatus that one embodiment of the invention proposes with power amplifier chips coupling part is illustrated
Figure.
Fig. 4 is that the circuit in the signal output apparatus that one embodiment of the invention proposes with protection circuit coupling part is illustrated
Figure.
Fig. 5 is the circuit diagram of power supply circuit in the signal output apparatus that one embodiment of the invention proposes.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.Many details are elaborated in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case of running counter to intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.Term as used herein " and/or " include the arbitrary of one or more related Listed Items and
All combinations.
Refer to Fig. 1 to Fig. 5, the signal output apparatus 10 that one embodiment of the invention provides, including audio processing chip
20th, the audio output circuit 30 that is connected with audio processing chip 20, the power amplifier chips 40 being connected with audio output circuit 30, with
Control circuit 50, biasing circuit 60, power supply circuit 70 and the protection circuit 80 that power amplifier chips 40 connect.Work as audio processing chip
20 when getting input signal, and input signal is converted into audio output signal by audio processing chip 20, wherein the audio output
Signal output after power amplifier chips 40 carry out signal amplification carries out the broadcasting of audio signal, wherein the broadcasting list to broadcast unit
Member can be loudspeaker or sound equipment.
Wherein, in the present embodiment, audio processing chip 20 is CODEC chips (codec), its
The CODEC modules in RK618 chips on specially auspicious core microfluidic platform, wherein CODEC chips are mainly responsible for turning data signal
Turn to analog signal (DAC) and analog signal is converted into data signal (ADC), it is possible to understand that, in other implementations of the present invention
In example, the audio processing chip 20 can also be other chips, will not be described here.Wherein in the present embodiment, audio frequency process core
Piece 20 includes 27 pins, and it comprises at least MIC signal input groups pin, audio signal input group pin and audio signal
Output group pin.
Wherein MIC signals input group pin includes MIC biasing pin (MICBIAS1), MIC signals input positive pin (MIC_
1P) and the negative pin (MIC_1N) of MIC signals input, wherein MIC biasing pin (MICBIAS1) are used to carry for MIC (microphone)
For bias voltage, MIC signals input positive pin (MIC_1P) and the negative pin (MIC_1N) of MIC signals input is used to receive difference
The MIC signals of input.Now MIC signals are inputted to audio processing chip 20 by Differential Input mode, and pass through audio frequency process
The output of audio signal is carried out after the processing of chip 20 by audio signal output group pin, wherein being pointed out that MIC
Signal needs to connect one first electric capacity C1 before inputting positive pin (MIC_1P) access MIC signals, and first electric capacity C1 is used to work as
MIC signals access to the effect of isolated DC when MIC signals input positive pin (MIC_1P), wherein, in the present embodiment, the first electricity
The capacitance for holding C1 is 100nF.With above-mentioned, one the is connected before negative pin (MIC_1N) the access MIC signals of MIC signals input
Two electric capacity C2, the second electric capacity C2 capacitance is 100nF.
Further, audio signal input group pin include for Differential Input signal positive input pin (IN1P) and
Signal negative input pin (IN1N), the signal input pin (LINE) and defeated for left and right sound channels signal for common mode input
The L channel input pin (IN3L) and R channel input pin (IN3R) entered.Wherein take office when audio processing chip 20 obtains
During the audio signal input of one type, the simulated audio signal of acquisition is converted to digital audio and video signals by audio processing chip 20,
Then audio signal output is carried out by audio signal output group pin.
Further, audio signal output group pin includes left channel signals output pin (LOUT) and right-channel signals are defeated
Go out pin (ROUT), wherein audio signal output group pin is connected with audio output circuit 30, the audio output circuit 30 and work(
Negative pin (IN-) connection of audio signal input of chip 40 is put, wherein audio output circuit 30 includes left audio output electricity
Road 31 and right audio channel output circuit 32, wherein left channel signals output pin (LOUT) and left audio output circuit 31
Connection, the left audio output circuit 31 include the first resistor R1 being sequentially connected with left channel signals output pin (LOUT)
With the 3rd electric capacity C3, wherein the negative pin (IN-) of audio signal input of the 3rd electric capacity C3 other end connection power amplifier chips 40.
With above-mentioned, right-channel signals output pin (ROUT) is connected with right audio channel output circuit 32, right audio channel output electricity
Road 32 includes the second resistance R2 and the 4th electric capacity C4 being sequentially connected with right-channel signals output pin (ROUT), wherein the 4th electricity
Hold the negative pin (IN-) of audio signal input of C4 other end connection power amplifier chips 40.Wherein, first resistor R1 and second resistance
R2 is used to play a part of feedback and current limliting, now by setting the big I of first resistor R1 and second resistance R2 resistance
To adjust the size of current of audio output circuit 30, in the present embodiment, first resistor R1 and second resistance R2 resistance are specific
For 20K ohms.3rd electric capacity C3 and the 4th electric capacity C4 is used for the direct current signal isolated in audio output circuit 30, is made an uproar with isolation
Sound.
Further, power amplifier chips 40 are electric with audio output circuit 30, control circuit 50, biasing circuit 60, power supply respectively
Road 70 and protection circuit 80 connect, and wherein power amplifier chips 40 are D-type audio power amplifier, and its concrete model is PT5305N,
Wherein power amplifier chips 40 include 8 pins, and it is followed successively by enabled pin (EN), bypass pin (BYPASS), audio signal input
Positive pin (IN+), the negative pin (IN-) of audio signal input, audio amplification signal export positive pin (VO1), power pins
(VDD), grounding leg (GND) and the negative pin (VO2) of audio amplification signal output.Wherein enabled pin (EN) and control circuit
50 connections, control circuit 50 include the 3rd resistor R3 and the 4th resistance R4 being connected respectively with enabled pin (EN), further,
3rd resistor R3 other end ground connection, the 4th resistance R4 other end and the controlling switch (SPK_CON) of process chip connect, its
Middle 3rd resistor R3 and the 4th resistance R4, which are combined, plays a part of partial pressure, and in the present embodiment, 3rd resistor R3 resistance is specially
1M ohms, the 4th resistance R4 resistance is specially 100K ohms, and the process chip is defeated by controlling controlling switch (SPK_CON)
The level height gone out controls the working condition of power amplifier chips 40 to realize.It is specially when controlling switch (SPK_CON) output
When level is high level, the level for enabling pin (EN) is also high level, and now power amplifier chips 40 are started working, by audio output
The audio signal of circuit 30 is transmitted to loudspeaker after being amplified to realize the broadcasting of audio.When controlling switch (SPK_CON) is defeated
When the level gone out is low level, the level for enabling pin (EN) is also low level, and now power amplifier chips 40 are stopped.
Further, bypass pin (BYPASS) is connected with biasing circuit 60, and wherein biasing circuit 60 includes drawing with bypass
5th electric capacity C5 of pin (BYPASS) connection, the 5th electric capacity C5 other end ground connection, wherein the 5th electric capacity C5 is shunt capacitance, its
The clutter in audio signal for filtering out prime input, wherein the 5th electric capacity C5 capacitance is 1uF.Further, audio
Signal inputs positive pin (IN+) and is connected with biasing circuit 60, and wherein biasing circuit 60 also includes inputting positive pin with audio signal
(IN+) the 6th electric capacity C6 being sequentially connected and the 5th resistance R5, the 5th resistance R5 other end ground connection, wherein, the 5th resistance R5
For current limliting, the 6th electric capacity C6 is used for isolated DC, and in the present embodiment, the 5th resistance R5 resistance is specially 1K ohms, and the 6th
Electric capacity C6 capacitance is 220nF.By biasing circuit 60 and audio output circuit 30 in power amplifier chips wherein in the present embodiment
Differential Input is realized in 40, now by the processing of power amplifier chips 40 by the differential signal after amplification respectively in audio amplification signal
Export and exported in positive pin (VO1) and the negative pin (VO2) of audio amplification signal output.
Further, power pins (VDD) are connected with power supply circuit 70, and wherein power supply circuit 70 includes with power supply drawing respectively
The 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10 and the magnetic bead FB of pin (VDD) connection, wherein the 7th
Electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10 other end ground connection, magnetic bead the FB other end and system supply
Power supply (VSYS) connects, and wherein system power supply power supply (VSYS) provides stable 5V power supplys.Magnetic bead FB is ferrite bean FB,
It is used to filter out the high-frequency noise in power supply.Wherein the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10
Resistance be respectively 10uF, 10uF, 100nF and 100nF, wherein the 7th electric capacity C7 and the 9th electric capacity C9 are combined be used for together
DC filtering acts on, and it coordinates simultaneously can filter out low-and high-frequency clutter, and the 8th electric capacity C8 and the 9th electric capacity C9 are combined be used for together
Decoupling, partial circuit is caused voltage pulsation caused by power supply to remove, avoids voltage pulsation from make it that various pieces circuit is mutual by it
Interference.Now power pins of the power supply circuit 70 by the output that system power supply power supply (VSYS) is stablized to power amplifier chips 40
(VDD), powered with providing the stable 5V power supplys of power amplifier chips 40.Further, grounding leg (GND) is connected to ground.
Further, audio amplification signal export positive pin (VO1) and the negative pin (VO2) of audio amplification signal output and
Protection circuit 80 connects, and wherein protection circuit 80 includes the positive protection circuit 81 of signal output and signal output bears protection circuit 82,
Wherein audio amplification signal exports positive pin (VO1) protection circuit 81 positive with signal output and is connected, and audio amplification signal output is negative
Pin (VO2) is born protection circuit 82 with signal output and is connected, and wherein the positive protection circuit 81 of signal output includes amplifying with audio and believed
6th resistance R6 of number output positive pin (VO1) connection, the first double diode D1 being connected with the 6th resistance R6 other end, the
One electrostatic impedor ESD1 and power amplifier socket 90, wherein the 6th resistance R6 resistance is specially 0 ohm, it is used for isolation and made an uproar
Sound, reduce interference.In the present embodiment, the first double diode D1 is specially BAT54S model double diodes, and its enclosed inside has two
The diode of individual reverse parallel connection, the plus earth of its a first double diode D1 diode, the negative pole of another diode
It is connected with power pins (VDD), wherein the first double diode D1 is used for voltage clamping, for by the positive protection circuit 81 of signal output
Upper voltage clamp is between 0~5V.Wherein the first electrostatic impedor ESD1 other end is grounded, first electrostatic in the present embodiment
Impedor ESD1 is specially bi-directional voltage stabilizing diode, and it is used for Electro-static Driven Comb, to prevent electrostatic interference and electrostatic breakdown electronics
Element, the effect of protection electronic component is realized, now passes through first pair of two pole of setting in the positive protection circuit 81 of signal output
Pipe D1 and the first electrostatic impedor ESD1 can realize the phenomenon that electrostatic and surge are prevented in power amplifier socket 90, avoid loudspeaker
When accessing power amplifier socket 90, due to the infringement of electrostatic and surge to loudspeaker and power amplifier chips 40.
Further, with above-mentioned, signal output, which bears protection circuit 82, to be included and the negative pin (VO2) of audio amplification signal output
7th resistance R7 of connection, the second double diode D2, the second electrostatic impedor being connected with the 7th resistance R7 other end
ESD2 and power amplifier socket 90, wherein the 7th resistance R7 resistance is specially 0 ohm, the second double diode D2 is specially
BAT54S model double diodes, the positive pole pin ground connection of its a second double diode D2 diode, another diode
Negative pole is connected with power pins (VDD).Wherein the second electrostatic impedor ESD2 other end ground connection.
Further, power amplifier socket 90 is used for speaker plug that is accommodating and accessing outside insertion, when loudspeaker is linked into
During power amplifier socket 90, the audio signal after the amplification of power amplifier chips 40 is transmitted in a manner of differential signal to loudspeaker, with driving
Loudspeaker carries out the broadcasting of audio signal.The wherein welding of power amplifier socket 90 is arranged on printed circuit board, the power amplifier socket 90
First fixed feet 3, the second fixed feet 4 are individually secured on printed circuit board, and are connected with the ground on printed circuit board.Wherein work(
Putting socket 90 includes two output ends, and it is connected with speaker plug, and two output end obtains the audio of Differential Input respectively
Signal.
Wherein, when user needs power amplifier to play, speaker plug is inserted on power amplifier socket 90, now user's selection is treated
The audio signal or MIC signals of broadcasting, when audio processing chip 20 gets the audio signal or MIC signals, by audio signal
Exported after being converted by audio signal output group pin, now audio signal output group pin exports the audio of left and right sound channels
It is defeated that the audio signal of signal, wherein left and right sound channels inputs audio signal to power amplifier chips 40 by audio output circuit 30
Enter in negative pin (IN-), and access biasing circuit 60 to audio signal in power amplifier chips 40 simultaneously and input in positive pin (IN+),
Being inputted with forming differential signal into power amplifier chips 40, power amplifier chips 40 export after the differential signal is carried out into power amplification, its
The working condition of middle power amplifier chips 40 controls the high low state of the level of enabled pin (EN) to be realized by process chip, when
When the level of the enabled pin (EN) of power amplifier chips 40 is high level, power amplifier chips 40 are started working, and exports audio signal is extremely
Power amplifier socket 90, the broadcasting of audio signal is carried out with the loudspeaker of driving access power amplifier socket 90.
Signal output apparatus 10 provided by the invention, MIC signals, differential mode audio can be realized by audio processing chip 20
The input of at least one of signal, common mode audio signal audio signal, and exported after processing converts, and MIC signals input
Electric capacity is connected with before group pin access MIC, can be with the interference of isolated DC signal, and the audio output signal exported is in audio
Due to setting electric capacity and resistance to isolate noise, its power supply circuit 50 and biasing circuit 60 with filtering clutter in output circuit 30
Due to setting the electric capacity and resistance of matching so that noise, the effect such as filtering clutter and decoupling so that input to work(can be isolated
Put and do not have noisy interference in the signal of chip 40, and power amplifier chips 40 in signal output due to protection circuit 80 set electricity
Resistance, double diode and electrostatic impedor so that isolate noise in the audio signal of the output after power amplification, and
The scope of the voltage of output is clamped down on and has prevented the interference of electrostatic so that when its loudspeaker accesses to power amplifier socket 90, kept away
Exempt from because electrostatic and surge are to infringement caused by loudspeaker 90 and power amplifier chips 40, while the output audio that can stablize
Signal, solve the problems, such as unstable during existing audio signal output.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software or firmware that can be performed with storage in memory and by suitable instruction execution system are realized.
If for example, being realized with hardware, with another embodiment, any in following technology well known in the art can be used
Or their combination realize：Discrete logic electricity with the logic gates for realizing logic function to data-signal
Road, there is the application specific integrated circuit of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array
(FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of signal output apparatus, it is characterised in that including the audio processing chip, audio output circuit, work(sequentially connected
Chip, protection circuit and power amplifier socket are put, wherein,
The audio processing chip is used to after the audio signal of acquisition is changed export；
The audio output circuit is used to input the audio output signal that the audio processing chip exports to the power amplifier core
Piece；
The power amplifier chips, are also connected with a biasing circuit, and the biasing circuit is used for input to the institute in the power amplifier chips
State audio output signal and carry out difference processing, the audio output signal after difference processing is carried out power by the power amplifier chips
Export after amplification, and transmitted after the protection circuit to the broadcast unit of power amplifier socket access, to drive the broadcasting
Unit carries out the broadcasting of the audio signal；
The protection circuit is used to eliminate the broadcast unit and electrostatic and surge phenomenon on the power amplifier chips.
2. signal output apparatus according to claim 1, it is characterised in that the signal output apparatus also include with it is described
The control circuit and power supply circuit of power amplifier chips connection, the control circuit are used for the working condition for controlling the power amplifier chips,
The power supply circuit is used to power for the power amplifier chips.
3. signal output apparatus according to claim 2, it is characterised in that the audio processing chip includes MIC signals
Input group pin, audio signal input group pin and audio signal output group pin；
The MIC signals input group pin includes MIC biasings pin, MIC signals input positive pin and MIC signals input and born and draw
Pin, the MIC signals input positive pin and connect the first electric capacity, and the negative pin of MIC signals input connects the second electric capacity；
The audio signal input group pin includes signal positive input pin and signal negative input pin for Differential Input, used
It is defeated in the signal input pin of common mode input and the L channel input pin for the input of left and right sound channels signal and R channel
Enter pin；
The audio signal output group pin includes left channel signals output pin and right-channel signals output pin；
The differential signal or the audio signal input group that the audio processing chip inputs the MIC signals input group pin
The audio signal of pin input is converted to the audio output signal, and is exported by the audio signal output group pin.
4. signal output apparatus according to claim 3, it is characterised in that the power amplifier chips include enabled pin, side
Pass pin, audio signal input positive pin, the negative pin of audio signal input, audio amplification signal export positive pin, power pins,
Grounding leg and the negative pin of audio amplification signal output, the enabled pin are connected with the control circuit, the bypass pin
Positive pin is inputted with the audio signal to be connected with the biasing circuit, the negative pin of the audio signal input and the audio are defeated
Go out circuit connection, the power pins are connected with the power supply circuit, and the audio amplification signal exports positive pin and the sound
The negative pin of frequency amplified signal output is connected with the protection circuit, the grounding leg ground connection.
5. signal output apparatus according to claim 4, it is characterised in that the audio output circuit includes L channel sound
Frequency output circuit and right audio channel output circuit；
The left audio output circuit includes the first resistor that is sequentially connected with the left channel signals output pin and the
Three electric capacity；
The right audio channel output circuit includes the second resistance that is sequentially connected with the right-channel signals output pin and the
Four electric capacity；
The other end of 3rd electric capacity and the 4th electric capacity inputs negative pin with the audio signal and is connected.
6. signal output apparatus according to claim 4, it is characterised in that the protection circuit is just protected including signal output
Protection circuit and signal output bear protection circuit；
The positive protection circuit of signal output includes exporting the 6th resistance that positive pin be connected and the with the audio amplification signal
The first double diode, the first electrostatic impedor and the power amplifier socket of the other end connection of six resistance, described first pair two
One end ground connection of pole pipe, the other end of first double diode are connected with the power pins, first electrostatic impedor
The other end ground connection；
The signal output bears the 7th resistance and the 7th electricity that protection circuit includes exporting negative pin with audio amplification signal and being connected
The second double diode, the second electrostatic impedor and the power amplifier socket of the other end connection of resistance, second double diode
One end ground connection, the other end of second double diode is connected with the power pins, second electrostatic impedor it is another
One end is grounded, and the power amplifier socket is used for accommodating and accesses the outside insertion broadcast unit.
7. signal output apparatus according to claim 4, it is characterised in that the control circuit includes with described making respectively
The 3rd resistor and the 4th resistance of energy pin connection, the other end ground connection of the 3rd resistor, the other end of the 4th resistance
It is connected with the controlling switch of process chip, the level height that the power amplifier chips export according to the controlling switch controls its work
State.
8. signal output apparatus according to claim 4, it is characterised in that the biasing circuit includes drawing with the bypass
5th electric capacity of pin connection, input the 6th electric capacity and the 5th resistance that positive pin is sequentially connected with the audio signal, described the
The other end of five electric capacity and the 5th resistance is grounded.
9. signal output apparatus according to claim 4, it is characterised in that the power supply circuit include respectively with the electricity
The 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity and the magnetic bead of source pin connection, the 7th electric capacity, the 8th electricity
The other end ground connection of appearance, the 9th electric capacity and the tenth electric capacity, the other end of the magnetic bead are connected with system power supply power supply.
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| CN201710940417.XA CN107809702B (en) | 2017-09-30 | 2017-09-30 | Signal output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710940417.XA CN107809702B (en) | 2017-09-30 | 2017-09-30 | Signal output circuit |
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| CN107809702B CN107809702B (en) | 2020-06-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110324759A (en) * | 2019-06-12 | 2019-10-11 | 深圳市金锐显数码科技有限公司 | Voice sound equipment pickup circuit and device |
| CN112153182A (en) * | 2019-06-28 | 2020-12-29 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2708563Y (en) * | 2004-06-17 | 2005-07-06 | 四川湖山电子股份有限公司 | Class H audio power amplifier |
| JP2009194871A (en) * | 2008-02-18 | 2009-08-27 | Digital Do Main Inc | Power-on timing limiting circuit of power amplifier using static induction transistor |
| CN202957960U (en) * | 2012-12-17 | 2013-05-29 | 青岛海信宽带多媒体技术有限公司 | High-fidelity (Hi-Fi) audio switching device |
| CN203788450U (en) * | 2014-04-18 | 2014-08-20 | 青岛海信移动通信技术股份有限公司 | Current hum restraining circuit of mobile terminal and mobile terminal |
| CN105407434A (en) * | 2015-12-28 | 2016-03-16 | 上海博泰悦臻网络技术服务有限公司 | Output control system for audio power amplifier and electronic apparatus with system |
| CN105635466A (en) * | 2015-12-30 | 2016-06-01 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and audio circuit thereof |
-
2017
- 2017-09-30 CN CN201710940417.XA patent/CN107809702B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2708563Y (en) * | 2004-06-17 | 2005-07-06 | 四川湖山电子股份有限公司 | Class H audio power amplifier |
| JP2009194871A (en) * | 2008-02-18 | 2009-08-27 | Digital Do Main Inc | Power-on timing limiting circuit of power amplifier using static induction transistor |
| CN202957960U (en) * | 2012-12-17 | 2013-05-29 | 青岛海信宽带多媒体技术有限公司 | High-fidelity (Hi-Fi) audio switching device |
| CN203788450U (en) * | 2014-04-18 | 2014-08-20 | 青岛海信移动通信技术股份有限公司 | Current hum restraining circuit of mobile terminal and mobile terminal |
| CN105407434A (en) * | 2015-12-28 | 2016-03-16 | 上海博泰悦臻网络技术服务有限公司 | Output control system for audio power amplifier and electronic apparatus with system |
| CN105635466A (en) * | 2015-12-30 | 2016-06-01 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and audio circuit thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110324759A (en) * | 2019-06-12 | 2019-10-11 | 深圳市金锐显数码科技有限公司 | Voice sound equipment pickup circuit and device |
| CN110324759B (en) * | 2019-06-12 | 2024-06-04 | 深圳市金锐显数码科技有限公司 | Voice sound pickup circuit and device |
| CN112153182A (en) * | 2019-06-28 | 2020-12-29 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
| CN112153182B (en) * | 2019-06-28 | 2022-04-19 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
| US11895469B2 (en) | 2019-06-28 | 2024-02-06 | Xi'an Zhongxing New Software Co. Ltd. | Audio circuit and mobile terminal provided with audio circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107809702B (en) | 2020-06-26 |
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