CN104348422A - Circuit structure and method for eliminating switching noise of audio power amplifier - Google Patents
Circuit structure and method for eliminating switching noise of audio power amplifier Download PDFInfo
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- CN104348422A CN104348422A CN201310333350.5A CN201310333350A CN104348422A CN 104348422 A CN104348422 A CN 104348422A CN 201310333350 A CN201310333350 A CN 201310333350A CN 104348422 A CN104348422 A CN 104348422A
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Abstract
The invention relates to a circuit structure for eliminating switching noise of an audio power amplifier. The circuit structure comprises a power amplification state detecting module and a power amplification running control module. The power amplification state detecting module is used for detecting and judging whether or not a circuit of the audio power amplifier is in a running state sudden-change process; the power amplification running control module is connected between the power amplification state detecting module and the audio power amplifier and is used for controlling action of the audio power amplifier according to a control signal transmitted by the power amplification state detecting module. The circuit structure and the method have the advantages that switching noise of the audio power amplifier in various circuit sudden-change conditions can be completely eliminated, using is facilitated, and the circuit structure is applicable to various types of audio power amplifiers and is widely applicable.
Description
Technical field
The present invention relates to audio-frequency power amplifier field, particularly relate to optimizing audio power amplifier field, specifically refer to a kind of circuit structure and the method thereof that realize eliminating audio-frequency power amplifier switching noise.
Background technology
So-called audio-frequency power amplifier switching noise, the transient noise that the loud speaker end be namely connected with audio frequency power amplifier sends, produces when carrying out following four kinds of operational circumstances to audio-frequency power amplifier usually: power on, power down, unlatching, shutoff.In these four kinds of operating process, direct current biasing all can change, and no matter is set up or disappear all to produce of short duration common mode pressure reduction in audio frequency power amplifier inside.As amplification ordinary audio ac input signal, the change of driving stage to this moment direct voltage also can respond, or driving stage operating state due to the ANOMALOUS VARIATIONS of supply voltage and inner DC offset voltage can not normal response, thus cause switching noise.This is obviously non-ideal situation, so will be processed, eliminate.
Prior art provides a lot of solution, but is only for individual circuit, lack versatility, be difficult to accomplish simultaneously with low cost, structure is simple, versatility good.And because the solution majority of prior art can only suppress and can not eliminate switching noise, desirable Consumer's Experience can not be brought.
Prior art 1:CN101127510A(differential input class D amplifier) propose a kind of switching noise suppression technology for its Differential Input D-type audio power amplifier, the frequency of switching noise is moved in the scope higher than human hearing range.
Prior art 2:CN101309071A(mono-kind suppresses the device of transient noise of audio power amplifier) a kind of device suppressing transient noise of audio power amplifier is disclosed, when reducing or eliminate power down lotus entry and exit standby mode on audio-frequency power amplifier, the click clatter noise produced in loud speaker.Its inventive point is to have employed the change in voltage amplitude reducing capacitance and loud speaker link and the two kinds of mode transient suppression noises being reduced time constant by the resistance reducing loud speaker end.
Prior art 3:CN201315565Y(power amplifier and multimedia play equipment) propose a kind of power amplifier and multimedia play equipment, described power amplifier comprises power amplifier chips signal being carried out to power amplification, is connected with a unilateal conduction device between the power end of described power amplifier chips and power supply.Its power amplifier is provided with unilateal conduction device, it by power amplifier chips power end and external power source with other load isolation open and see, after there is power down, the voltage drop speed of the power end of power amplifier chips is controlled, thus effectively prevent the generation of shut down switch noise.
The implementation the most close with the present invention: prior art 4:CN101499776A(mono-kind reduces circuit and the method for switching noise of amplifier) a kind of Method and circuits of step-down amplifier switching noise is proposed, switching noise is reduced to the insensitive degree of people's ear.The settling time of its internal bias voltage is greater than audiorange, adopts overlapping clock, prevents amplifier to be operated in open loop situations during switching, thus reduces to switch the impact caused, thus reduces the switching noise of whole switching process.
Prior art why can switch noise inhibiting, summing up gets up is exactly change the original sequential of circuit, control power supply, bias voltage, the isoparametric change of output voltage, switching noise frequency is moved to the scope can perceived higher than people's ear, or switching noise energy is reduced to certain degree and makes it to be not easy to be discovered.In addition, in addition audio frequency power amplifier volume is adjusted to minimum after the method such as closedown again.On the whole, prior art is all suppression to a certain extent for switching noise problem, but not eradicates thoroughly.
In unlatching, turn off process, supply voltage does not change, and operating state, the sequential of circuit easily control and change, and usually adopts prior art all effectively can suppress the switching noise produced therebetween, although can not eliminate completely, the sense of hearing of ordinary people can receive.And power on, in power down process, because internal circuit is subject to supply voltage not reach the impact of normal working point, sequencing control function (logic level) designed by prior art is difficult to accurate execution, so be more that the switching noise relying on adjustment peripheral components parameter (physical level) to realize to a certain extent suppresses.So current switch noise is still a technical problem in audio-frequency power amplifier field, and prior art cannot fundamentally overcome this problem, particularly to circuit powering on, in power down process, and switching noise is more obvious during power down.
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide and a kind ofly can realize removing completely audio-frequency power amplifier switching noise, structure is simple, easy to use, audio-frequency power amplifier switching noise is eliminated in realization that is that have wide range of applications circuit structure and method thereof.
In order to realize above-mentioned target, circuit structure and the method thereof of realization elimination audio-frequency power amplifier switching noise of the present invention have following formation:
This is used for the circuit structure eliminating audio-frequency power amplifier switching noise, and its main feature is, described circuit structure comprises:
Power amplifier state detection module, in order to detect and the process of the whether in running order sudden change of circuit of audio-frequency power amplifier described in judging;
Power amplifier working control module, be connected between described power amplifier state detection module and described audio-frequency power amplifier, the action of the audio-frequency power amplifier described in this power amplifier working control module controls in order to the control signal transmitted according to described power amplifier state detection module.
Preferably, described power amplifier state detection module comprises:
Power-up state detection module, be connected with described power amplifier working control module, this detection module that powers on is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in the process never supplying power to power supply electrifying, if then export one to control signal to power amplifier working control module;
Power-down state detection module, be connected with described power amplifier working control module, this detection of power loss module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in process from supplying power to dump, if then export one to control signal to power amplifier working control module;
Opening detection module, be connected with described power amplifier working control module, this open detection module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in process from turning off normal work, if then export one to control signal to power amplifier working control module;
Off state detection module, be connected with described power amplifier working control module, this shutoff detection module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in from normal work to the process turned off, if then export one to control signal to power amplifier working control module.
Preferably, described power amplifier working control module is time-sequence control module.
Preferably, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and described power amplifier working control module is connected with power amplifier driving stage with described preamplifier state respectively.
Preferably, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and described power amplifier working control module is connected with described preamplifier state.
The invention still further relates to a kind of method realizing eliminating audio-frequency power amplifier switching noise, described method comprises the following steps:
(1) the power amplifier state detection module described in detects and the operating state of the circuit of audio-frequency power amplifier described in judging;
(2), when the operating state of the circuit of the audio-frequency power amplifier described in is suddenlyd change, the audio-frequency power amplifier described in described power amplifier working control module controls suspends response;
(3), after the operating state of the circuit of the audio-frequency power amplifier described in is suddenlyd change and terminated, the audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier.
Preferably, described power amplifier state detection module detects and the operating state of the circuit of audio-frequency power amplifier described in judging, comprises the following steps:
(11) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier not yet powers, and if it is continues step (12), otherwise continues step (13);
(12) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier is in power-up state, if it is continues step (14), otherwise continues step (12);
(13) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier is in unlatchings, turns off or the operating state of power down, if it is continues step (14), otherwise continuation step (13);
(14) the power amplifier state detection module described in exports one and controls signal to described power amplifier working control module, then continues step (2).
More preferably, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and the audio-frequency power amplifier described in described power amplifier working control module controls suspends response, comprises the following steps:
(21) classification of the control signal that the power amplifier state detection module described in the power amplifier working control module described in judges exports, if power down or shutoff control signal, then continue step (22), if power on or open control signal, then continue step (23);
(22) preamplifier state described in the power amplifier working control module described in controls keeps zero-bit to export, and then continues step (23);
(23) the power amplifier driving stage described in closes response, then continues step (3).
Further, the audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier, comprises the following steps:
(31) target operating condition of the circuit described in the power amplifier working control module described in judges, if power down or shutoff operating state, then continues step (32), if power on or open operating state, then continues step (33);
(32) preamplifier state described in the power amplifier working control module described in controls is closed, and then terminates to exit;
(33) preamplifier state described in the power amplifier working control module described in controls keeps zero-bit to export, and then continues step (34);
(34) the power amplifier driving stage described in the power amplifier working control module described in controls recovers response, then continues step (35);
(35) the enlarge leadingly level restoration described in the power amplifier working control module described in controls normally exports, and then terminates to exit.
More preferably, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and the audio-frequency power amplifier described in described power amplifier working control module controls suspends response, is specially:
Preamplifier state described in described power amplifier working control module controls keeps zero-bit to export.
Further, the audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier, comprises the following steps:
(41) target operating condition of the circuit described in the power amplifier working control module described in judges, if power down or shutoff operating state, then continues step (42), if power on or open operating state, then continues step (43);
(42) preamplifier state described in the power amplifier working control module described in controls is closed, and then terminates to exit;
(43) the enlarge leadingly level restoration described in the power amplifier working control module described in controls normally exports, and then terminates to exit.
Circuit structure and the method thereof of audio-frequency power amplifier switching noise are eliminated in the realization that have employed in this invention, have following beneficial effect:
1, provide a kind of circuit structure and the method thereof that realize eliminating audio-frequency power amplifier switching noise, the switching noise produced in all cases at audio-frequency power amplifier can be eliminated completely.
2, the switching noise that different preamplifier states, different audio frequency power amplifier driving stages produce is all variant, but the switching noise of audio-frequency power amplifier all can be eliminated completely according to technical solution of the present invention, all can use for dissimilar audio-frequency power amplifier, there is extremely strong versatility.
Accompanying drawing explanation
Fig. 1 is the circuit structure intention for eliminating audio-frequency power amplifier switching noise of the present invention.
Fig. 2 is for eliminating the structural representation of the circuit structure of audio-frequency power amplifier switching noise in embodiments of the invention.
Fig. 3 is the method flow diagram realizing eliminating audio-frequency power amplifier switching noise of the present invention.
Fig. 4 is the method flow diagram realizing eliminating audio-frequency power amplifier switching noise in embodiments of the invention.
Fig. 5 is the circuit of the audio-frequency power amplifier of prior art produces switching noise waveform schematic diagram when circuit suddenlys change.
Fig. 6 is the waveform schematic diagram that after adopting the circuit structure of realization elimination audio-frequency power amplifier switching noise of the present invention and method thereof, circuit does not produce switching noise.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Technical thought of the present invention is: control the circuit of audio-frequency power amplifier in an abnormal situation, i.e. power-up state, power-down state, opening, off state etc., first first stop the response to all input signals, and then determine to carry out normal magnifying state to carry out powering on or open according to action type or shut-off circuit carries out power down or shutoff, so just can perfectly realize switching noise and inhibit.
Technical scheme of the present invention is: first decision circuitry operating state, is the response that one of four kinds of processes noted earlier just stop audio-frequency power amplifier, is finally out according to circuit final goal state or closes the final operating state determining driving stage if judge.
As shown in Figure 1, be the electrical block diagram for eliminating audio-frequency power amplifier switching noise of the present invention.
Described comprises for the circuit structure eliminating audio-frequency power amplifier switching noise:
Power amplifier state detection module 1, in order to detect and the process of the whether in running order sudden change of circuit of audio-frequency power amplifier 4 described in judging;
Power amplifier working control module 2, be connected between described power amplifier state detection module 1 and described audio-frequency power amplifier 4, the action of the audio-frequency power amplifier 4 described in this power amplifier working control module 2 controls in order to the control signal transmitted according to described power amplifier state detection module 1.
As shown in Figure 2, be the detailed circuit structural representation for eliminating audio-frequency power amplifier switching noise of the present embodiment.
Described power amplifier state detection module 1 comprises:
Power-up state detection module 11, be connected with described power amplifier working control module 2, this detection module 11 that powers on is in order to detect and whether the circuit of audio-frequency power amplifier 4 described in judging is in the process never supplying power to power supply electrifying, if then export one to control signal to power amplifier working control module 2;
Power-down state detection module 12, be connected with described power amplifier working control module 2, this detection of power loss module 12 is in order to detect and whether the circuit of audio-frequency power amplifier 4 described in judging is in process from supplying power to dump, if then export one to control signal to power amplifier working control module 2;
Opening detection module 13, be connected with described power amplifier working control module 2, this open detection module 13 is in order to detect and whether the circuit of audio-frequency power amplifier 4 described in judging is in process from turning off normal work, if then export one to control signal to power amplifier working control module 2;
Off state detection module 14, be connected with described power amplifier working control module 2, this shutoff detection module 14 is in order to detect and whether the circuit of audio-frequency power amplifier 4 described in judging is in from normal work to the process turned off, if then export one to control signal to power amplifier working control module 2.
In the present embodiment, described power amplifier working control module is time-sequence control module 21.
In the present embodiment, described audio-frequency power amplifier 4 comprises preamplifier state 42 and power amplifier driving stage 41, and described power amplifier working control module 2 is connected with power amplifier driving stage 41 with described preamplifier state 42 respectively.
In another kind of preferred embodiment, described audio-frequency power amplifier 4 comprises preamplifier state 42 and power amplifier driving stage 41, and described power amplifier working control module 2 is only connected with described preamplifier state 42.
Described time-sequence control module 21 is used for receiving the output of power-up state detection module 11, power-down state detection module 12, off state detection module 13, opening detection module 14, the sequencing control mode different with power amplifier driving stage 41 to preamplifier state 42 according to the signal deciding received, produces to avoid the switching noise that cannot overcome existed in prior art.
In specific embodiments of the invention, described preamplifier state 42 and power amplifier driving stage 41, its export enable of control of time-sequence control module 21 can be accepted and close, predetermined working method can be entered into according to the output of time-sequence control module 21 and state is gone.
As shown in Figure 3, be the flow chart realizing the method eliminating audio-frequency power amplifier switching noise of the present invention.
The method realizing elimination audio-frequency power amplifier switching noise of the present invention, comprises the following steps:
(1) the power amplifier state detection module 1 described in detects and the operating state of the circuit of audio-frequency power amplifier 4 described in judging;
(2), when the operating state of the circuit of the audio-frequency power amplifier 4 described in is suddenlyd change, described power amplifier working control module 2 controls described audio-frequency power amplifier 4 and suspends response;
(3), after the operating state of the circuit of the audio-frequency power amplifier 4 described in is suddenlyd change and terminated, described power amplifier working control module 2 controls the target operating condition that described audio-frequency power amplifier 4 completes the circuit of described audio-frequency power amplifier 4.
As shown in Figure 4, be the concrete methods of realizing flow chart of the realization elimination audio-frequency power amplifier switching noise of the present embodiment.
In this embodiment, described power amplifier working control module 2 is connected with power amplifier driving stage 41 with described preamplifier state 42, can control described preamplifier state 42 and the action of power amplifier driving stage 41.
Described power amplifier state detection module 1 detects and the operating state of the circuit of audio-frequency power amplifier 4 described in judging, comprises the following steps:
(11) the power amplifier state detection module 1 described in detects and judges whether the circuit of current described audio-frequency power amplifier 4 not yet powers, and if it is continues step (12), otherwise continues step (13);
(12) the power amplifier state detection module 1 described in detects and judges whether the circuit of current described audio-frequency power amplifier 4 is in power-up state, if it is continues step (14), otherwise continues step (12);
(13) the power amplifier state detection module 1 described in detects and judges whether the circuit of current described audio-frequency power amplifier 4 is in unlatchings, turns off or the operating state of power down, if it is continues step (14), otherwise continuation step (13);
(14) the power amplifier state detection module 1 described in exports one and controls signal to described power amplifier working control module 2, then continues step (2).
Described audio-frequency power amplifier 4 comprises preamplifier state 42 and power amplifier driving stage 41, and described power amplifier working control module 2 controls described audio-frequency power amplifier 4 and suspends response, comprises the following steps:
(21) the power amplifier working control module 2 described in judges the classification of the control signal that described power amplifier state detection module 1 exports, if power down or shutoff control signal, then continue step (22), if power on or open control signal, then continue step (23);
(22) the power amplifier working control module 2 described in controls described preamplifier state 42 and keeps zero-bit to export, and then continues step (23);
(23) the power amplifier driving stage 41 described in closes response, then continues step (3).
Described power amplifier working control module 2 controls the target operating condition that described audio-frequency power amplifier 4 completes the circuit of described audio-frequency power amplifier 4, comprises the following steps:
(31) the power amplifier working control module 2 described in judges the target operating condition of described circuit, if power down or shutoff operating state, then continues step (32), if power on or open operating state, then continues step (33);
(32) the power amplifier working control module 2 described in controls described preamplifier state 42 and closes, and then terminates to exit;
(33) the power amplifier working control module 2 described in controls described preamplifier state 42 and keeps zero-bit to export, and then continues step (34);
(34) the power amplifier working control module 2 described in controls described power amplifier driving stage 42 and recovers response, then continues step (35);
(35) the power amplifier working control module 2 described in controls described preamplifier state 42 and recovers normal output, then terminates to exit.
In another kind of preferred embodiment, described power amplifier working control module 2 is connected with described preamplifier state 42, the action of the preamplifier state 42 described in only controlling.
Described power amplifier working control module 2 controls described audio-frequency power amplifier 4 and suspends response, is specially:
Described power amplifier working control module 2 controls described preamplifier state 42 and keeps zero-bit to export.
Described power amplifier working control module 2 controls the target operating condition that described audio-frequency power amplifier 4 completes the circuit of described audio-frequency power amplifier 4, comprises the following steps:
(41) the power amplifier working control module 2 described in judges the target operating condition of described circuit, if power down or shutoff operating state, then continues step (42), if power on or open operating state, then continues step (43);
(42) the power amplifier working control module 2 described in controls described preamplifier state 42 and closes, and then terminates to exit;
(43) the power amplifier working control module 2 described in controls described preamplifier state 42 and recovers normal output, then terminates to exit.
Adopt above-mentioned circuit structure and method, the condition that switching noise produces can be eliminated, avoid trumpet end that noise beastly occurs completely.
One or more of power-up state detection module 11, power-down state detection module 12, opening detection module 13, off state detection module 14 can be used as required, the Control timing sequence of time-sequence control module 21 also can be exchanged or be changed, the target and effect of eliminating switching noise can be reached equally, be not limited to the structure and method of embodiment one.
As shown in Figure 5, for the audio-frequency power amplifier of prior art and loud speaker powering on, power down, unlatching, produce the waveform schematic diagram of switching noise in off state, transverse axis is the time, and the longitudinal axis is voltage.
Under prior art, switching noise is not thoroughly eliminated, and oscilloscope shows as a burst pulse instantaneously, although its amplitude, width can adjustment technology parameter reduce as far as possible, cannot eliminate.
As shown in Figure 6, for adopt audio frequency power amplifier after the present invention powering on, power down, unlatching, do not produce the waveform schematic diagram of switching noise in off state, transverse axis is the time, and the longitudinal axis is voltage:
The technology used in the present invention solution can avoid the generation of prior art switching noise completely, and oscilloscope be can't see the pulse of any moment completely, only there is the static noise that audio frequency power amplifier is intrinsic, thus can't hear switching noise at loud speaker end.
Circuit structure and the method for audio-frequency power amplifier switching noise are eliminated in the realization that have employed in this invention, have following beneficial effect:
1, provide a kind of circuit structure and the method that realize eliminating audio-frequency power amplifier switching noise, the switching noise produced in all cases at audio-frequency power amplifier can be eliminated completely.
2, the switching noise that different preamplifier states, different audio frequency power amplifier driving stages produce is all variant, but the switching noise of audio-frequency power amplifier all can be eliminated completely according to technical solution of the present invention, all can use for dissimilar audio-frequency power amplifier, there is extremely strong versatility.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (11)
1. for eliminating a circuit structure for audio-frequency power amplifier switching noise, it is characterized in that, described circuit structure comprises:
Power amplifier state detection module, in order to detect and the process of the whether in running order sudden change of circuit of audio-frequency power amplifier described in judging;
Power amplifier working control module, be connected between described power amplifier state detection module and described audio-frequency power amplifier, the action of the audio-frequency power amplifier described in this power amplifier working control module controls in order to the control signal transmitted according to described power amplifier state detection module.
2. the circuit structure for eliminating audio-frequency power amplifier switching noise according to claim 1, is characterized in that, described power amplifier state detection module comprises:
Power-up state detection module, be connected with described power amplifier working control module, this detection module that powers on is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in the process never supplying power to power supply electrifying, if then export one to control signal to power amplifier working control module;
Power-down state detection module, be connected with described power amplifier working control module, this detection of power loss module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in process from supplying power to dump, if then export one to control signal to power amplifier working control module;
Opening detection module, be connected with described power amplifier working control module, this open detection module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in process from turning off normal work, if then export one to control signal to power amplifier working control module;
Off state detection module, be connected with described power amplifier working control module, this shutoff detection module is in order to detect and whether the circuit of audio-frequency power amplifier described in judging is in from normal work to the process turned off, if then export one to control signal to power amplifier working control module.
3. the circuit structure for eliminating audio-frequency power amplifier switching noise according to claim 1, is characterized in that, described power amplifier working control module is time-sequence control module.
4. the circuit structure for eliminating audio-frequency power amplifier switching noise according to claim 1, it is characterized in that, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and described power amplifier working control module is connected with power amplifier driving stage with described preamplifier state respectively.
5. the circuit structure for eliminating audio-frequency power amplifier switching noise according to claim 1, it is characterized in that, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, and described power amplifier working control module is connected with described preamplifier state.
6. realize based on the circuit structure according to any one of claim 1 to 5 method eliminating audio-frequency power amplifier switching noise, it is characterized in that, described method comprises the following steps:
(1) the power amplifier state detection module described in detects and the operating state of the circuit of audio-frequency power amplifier described in judging;
(2), when the operating state of the circuit of the audio-frequency power amplifier described in is suddenlyd change, the audio-frequency power amplifier described in described power amplifier working control module controls suspends response;
(3), after the operating state of the circuit of the audio-frequency power amplifier described in is suddenlyd change and terminated, the audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier.
7. according to claim 6ly realize the method eliminating audio-frequency power amplifier switching noise, it is characterized in that, described power amplifier state detection module detects and the operating state of the circuit of audio-frequency power amplifier described in judging, comprises the following steps:
(11) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier not yet powers, and if it is continues step (12), otherwise continues step (13);
(12) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier is in power-up state, if it is continues step (14), otherwise continues step (12);
(13) the power amplifier state detection module described in detects and judges whether the circuit of current described audio-frequency power amplifier is in unlatchings, turns off or the operating state of power down, if it is continues step (14), otherwise continuation step (13);
(14) the power amplifier state detection module described in exports one and controls signal to described power amplifier working control module, then continues step (2).
8. the method realizing elimination audio-frequency power amplifier switching noise according to claim 7, it is characterized in that, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, audio-frequency power amplifier described in described power amplifier working control module controls suspends response, comprises the following steps:
(21) classification of the control signal that the power amplifier state detection module described in the power amplifier working control module described in judges exports, if power down or shutoff control signal, then continue step (22), if power on or open control signal, then continue step (23);
(22) preamplifier state described in the power amplifier working control module described in controls keeps zero-bit to export, and then continues step (23);
(23) the power amplifier driving stage described in closes response, then continues step (3).
9. the method realizing elimination audio-frequency power amplifier switching noise according to claim 8, it is characterized in that, audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier, comprises the following steps:
(31) target operating condition of the circuit described in the power amplifier working control module described in judges, if power down or shutoff operating state, then continues step (32), if power on or open operating state, then continues step (33);
(32) preamplifier state described in the power amplifier working control module described in controls is closed, and then terminates to exit;
(33) preamplifier state described in the power amplifier working control module described in controls keeps zero-bit to export, and then continues step (34);
(34) the power amplifier driving stage described in the power amplifier working control module described in controls recovers response, then continues step (35);
(35) the enlarge leadingly level restoration described in the power amplifier working control module described in controls normally exports, and then terminates to exit.
10. the method realizing elimination audio-frequency power amplifier switching noise according to claim 7, it is characterized in that, described audio-frequency power amplifier comprises preamplifier state and power amplifier driving stage, audio-frequency power amplifier described in described power amplifier working control module controls suspends response, is specially:
Preamplifier state described in described power amplifier working control module controls keeps zero-bit to export.
11. methods realizing elimination audio-frequency power amplifier switching noise according to claim 10, it is characterized in that, audio-frequency power amplifier described in described power amplifier working control module controls completes the target operating condition of the circuit of described audio-frequency power amplifier, comprises the following steps:
(41) target operating condition of the circuit described in the power amplifier working control module described in judges, if power down or shutoff operating state, then continues step (42), if power on or open operating state, then continues step (43);
(42) preamplifier state described in the power amplifier working control module described in controls is closed, and then terminates to exit;
(43) the enlarge leadingly level restoration described in the power amplifier working control module described in controls normally exports, and then terminates to exit.
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| CN106303834A (en) * | 2016-10-14 | 2017-01-04 | Tcl通力电子（惠州）有限公司 | Mute control device and method of power amplification system |
| CN107889030A (en) * | 2017-11-20 | 2018-04-06 | 深圳市沃特沃德股份有限公司 | The method and apparatus for controlling power amplifier |
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
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| CN107889030A (en) * | 2017-11-20 | 2018-04-06 | 深圳市沃特沃德股份有限公司 | The method and apparatus for controlling power amplifier |
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
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