CN101507105A - Method and apparatus for controlling a selectable voltage audio power output stage - Google Patents
Method and apparatus for controlling a selectable voltage audio power output stage Download PDFInfo
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- CN101507105A CN101507105A CNA2007800309333A CN200780030933A CN101507105A CN 101507105 A CN101507105 A CN 101507105A CN A2007800309333 A CNA2007800309333 A CN A2007800309333A CN 200780030933 A CN200780030933 A CN 200780030933A CN 101507105 A CN101507105 A CN 101507105A
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Abstract
A method and apparatus for controlling a selectable voltage audio power output stage provides a mechanism for raising the selected power amplifier output voltage in time for the arrival of signal peaks to avoid clipping. Signal peaks may either be delayed by delaying an increase in volume control level or enabling signal compression for a predetermined time period, so that sufficient time is provided for the amplifier power supply to stabilize at a higher operating voltage when an increase of power supply voltage is selected. Alternatively, a signal level may be determined at an upstream source, such as a decoder or filter that provides information in sufficient advance of the arrival of the peaks, and used to control the power supply selection, so that the higher power supply voltage level is selected in advance of arrival of the signal peaks that would otherwise cause clipping at the power amplifier output.
Description
Technical field
The present invention relates to the audio power output stage of consumer electronic device, more particularly, relate to the control circuit that the audio power level is selected supply voltage.
Background technology
On battery powered consumer audio frequency apparatus, power-output amplifier normally is used for using battery power to drive a pair of earphone or loud speaker.The output stage of this equipment has linear power amplifier, and there is power wastage in it at the low-signal levels output stage, and this is because the pressure drop of the output transistor of work adds that output voltage equals the changeless rail voltage of power supply.
Even the electric current in the frequency converter reduces when low signal amplitudes, but with export to comparing of load, more electric weight remains waste and has been dissipated in output transistor.Battery supply has only usually in linear amplifier circuit by reducing supply voltage and is reduced, thereby limited available power output, also possibly can't use in some applications, for example the output of power amplifier also must be provided at the line output signal that the saturation signal level provides a signal specific as one, one 600 ohm load loading+5dBm (10dBm make progress 15dB) for example, this needs the signal amplitude of a 3V.
Therefore, preferably can provide the power amplifier circuit of a consumer audio frequency apparatus, raise the efficiency and reduce power consumption, keep specific saturation signal fan-out capability simultaneously.This amplifier circuit control method further is provided, saves electric power and reduce power consumption, avoid the slicing of audio signal simultaneously.
Summary of the invention
The invention provides a kind of power consumption of raising the efficiency, reduce, avoid the slicing of audio signal simultaneously, be applied in the linear power amplifier circuit and the function mode thereof of consumer audio frequency apparatus.
This power amplifier circuit comprises a power supply, and it has a selectable electric power output voltage, thereby amplifier power supply rail voltage can be reduced, when maximum power supply voltage does not need to amplify audio signal to reduce energy consumption and to reduce power consumption.The selection of supply voltage should meet the needs of audio signal.
When selecting the volume of control circuit control signal of electric power output voltage, an audio compression rises up to enabling and is activated when supply voltage is stabilized in higher level always, or by signal controlling the increase that postpones volume is set.In addition, control circuit provides from the source, upstream of audio signal and has indicated as the amplitude of decoder or filter, such amplitude indication is enough to be provided before the peak value of audio signal arrives amplifier, so that made power supply can be stabilized in higher operating voltage before peak value arrives amplifier.
Above-mentioned purpose of the present invention and other purposes, its function and advantage will obviously embody from following embodiment and accompanying drawing thereof.
Description of drawings
Fig. 1 is the described consumer audio frequency apparatus audio frequency output stage schematic diagram of the embodiment of the invention;
Fig. 2 is the schematic diagram of the described charge pump power supply 10 of Fig. 1;
Fig. 3 A is Fig. 2 schematic diagram in described charge pump power supply circuit single charge pump clock stage under each work pattern to 3D;
Fig. 4 is the schematic diagram of the described amplifier control circuit of the embodiment of the invention;
Fig. 5 is the described amplifier power supply control method of an embodiment of the invention schematic diagram.
Embodiment
The present invention includes the control method and the device of the supply voltage of selecting to offer audio-frequency power amplifier.The supply voltage that offers final power amplifier is optionally, and be set to consistent with the expectation that is exaggerated or actual audio signal level, thereby make signal amplitude not need maximum mains voltage, thereby supply voltage reduces the saving energy like this.For example, with a peak swing be-6dB, the signal that transient peak reaches 0dB amplifies, and the supply voltage of final amplifier just can be reduced to 1/2nd of above-mentioned peak value, and can not produce slicing.Thus, power consumption just is reduced to 1/4th, and is reduced to major general's power loss and does not have the amplifier of optional power supply level.The control method of this selection supply voltage can postpone or suppress the increase of signal volume, be stabilized in higher level up to selecteed supply voltage, or the amplifying signal information that enough morning, receives from the stream signal source, power supply was stabilized in higher voltage if having time before voltage peak arrives.
As shown in Figure 1, this is an embodiment of the audio frequency output stage of consumer audio device of the present invention.A digital to analog converter (DAC) 14 provides an analog signal to the first amplifier stage A2, and it is driven by a fixing voltage source.The input of digital to analog converter 14 can also be selectively connected thereto a decoder 13, its be used for decoding file or a string data flow, for example MP3 encoded data stream.The signal of first amplifier stage A2 output offers attenuator 16, and it is used for the volume of reception control signal, and directly signal is decayed.Attenuator 16 can be a digital partial pressure gauge, it is by microcontroller or other digital control circuit regulates the button decoder according to user interface, volume or program command is controlled, perhaps attenuator 16 also can be one provides volume control signal as an analog voltage-dividing meter that comes from the output indication of second control board (the independent partial pressure gauge circuit that is coupled to public rotating shaft or other mechanical devices), uses for power supply control algorithm described below.Attenuator 16 is the control of mechanical type volume, and clearly same volume control can be realized by the programmable resistance of the feedback loop of another amplifier in an amplifier A2 or the signal path.Final power amplifier A2 amplifies the signal of attenuator 16, and an audio output signal is provided, and is used for driving loudspeaker, earpiece transducer, and/or a capable signal is exported.Particularly under the situation that amplifier A1 is driven by a unipolar power source fixing with respect to ground voltage, a capacitor C 1 can be used to output signal is coupled to converter or the output of row signal.
Described volume control signal also can be provided to mode control circuit 12, the output supply voltage that is used for controlling the rail power end that offers power amplifier A1 is consistent with the power amplifier A1 level output signal scope of expection, make that the peak signal of power amplifier A1 can slicing, but when peak signal does not exist, reduce supply voltage.In addition, or in connection, the output of amplifier A2 also offers mode control circuit 12, makes mode control circuit 12 can measure actual signal level, and the supply voltage of power amplifier A1 is adjusted to consistent with the signal level of the reality of regenerating at power amplifier A1 output.In an embodiment, because volume is controlled at the signal level of amplifier A2 output and measures generation afterwards, even information volume still needs signal level to be detected by mode control circuit 12, because mode control circuit must receive before by the information of the gain/attenuation of power amplifier A1 amplifying signal.Simultaneously, the output of decoder 13, if exist, provide one to prenotice for mode control circuit 12, peak amplitude in the expression signal will arrive digital to analog converter 14, and therefore an early stage indication is provided,, just need carries out the conversion of operator scheme if the low-voltage of charge pump power supply 10/electric weight operator scheme is selected.
Charge pump power supply 10 provides the rail power supply input of amplifier A1, and receives a power supply input, normally comes from battery or other power supplys, for example battery link Vbatt+ and Vbatt-.Mode control circuit 12 provides a mode select signal for charge pump power supply 10, selects the operator scheme of charge pump power supply 10.Output rail power connector end out+ that charge pump power supply 10 provides and out-have " saturated " (maximum) voltage in first operator scheme, in second operator scheme, has the saturation voltage of being lower than and proportional voltage, it is selected by mode control circuit, and output enough low when audio signal level or expectation power amplifier A1 enough low the time can not produce slicing.
Charge pump power supply 10 shown in Fig. 2 and Fig. 3 A-3D.When first operator scheme (pattern 1) was selected, described mode select signal was in logic high (" 1 "), and switch S 8 closures, made described Vbatt+ voltage be directly connected to the out+ end.Fig. 3 A and Fig. 3 B are depicted as being connected of when first and second clock phases circuit, wherein switch and the idle circuit element opened are ignored.Switch S 2, S2 and S4 open and are inoperative in first operator scheme, simultaneously logical AND gate AND10 and AND11 make S1, and the control signal of S2 and S4 lost efficacy, and by inverter I10 that mode select signal is anti-phase in logic low (" 0 ").For single-ended (one pole) power supply, capacitor C 12-C13, switch S 3, S6 and switch S 7 are omitted.Shown in Fig. 3 A-3B, in pattern 1, the positive terminal out+ of supply voltage is directly provided by the positive terminal Vbatt+ of input.
In order to produce the negative pole of supply voltage in pattern 1, the input voltage that provides between input Vbatt+ and Vbatt-is anti-phase by a voltage inverter.In the phase place 1 (Φ 1) of pattern 1, switch S 3 and switch S 6 closures, thereby by being connected to input Vbatt+ and Vbatt-to capacitor C 12 chargings, as shown in Figure 3A.The clear polarization capacity C10-C13 that shown of Fig. 3 A-3D, clearly polarization capacity not necessarily, and non-polarized electric capacity also can be used as C10-C13.In the phase place 2 (Φ 2) of pattern 1, switch S 3 and switch S 6 are opened, and switch S 5 and switch S 7 closures make the anti-phase Vbatt-of the being connected to input in two ends of capacitor C 12.Make the capacitor C 12 that is connected to the Vbatt-input be connected to the negative pole out-of output in phase place 1 switch S 7, shown in Fig. 3 B.Above-mentioned change action provides a cathode voltage about the Vbatt-end at out-end, and its size equals the magnitude of voltage between out+ end and the Vbatt-end, and the node place between output capacitance C11 and C13 is as reference voltage (hold).
In second operator scheme (pattern 2), pattern 2 is activated when mode select signal is in logic low (" 0 "), and switch S 8 disconnects.In the phase place 1 (Φ 1) of pattern 2, switch S 1 and S4 closure make capacitor C 10 connect with the output of the capacitor C 11 that is connected Vbatt+ and Vbatt-end, shown in Fig. 3 C.In the phase place 2 (Φ 2) of pattern 2, switch S 2 and S4 open, and switch S 2 and S5 closure make capacitor C 10 in parallel with capacitor C 11, shown in Fig. 3 D.Because second phase place in the pattern 2 equates the voltage of electric capacity 10 and capacitor C 11, the stable working point of circuit produces, and the input voltage between Vbatt+ end and Vbatt-end will not considered the relation of capacitor C 10 and C11 by mean allocation in the charging phase place.Therefore the voltage of out+ output will be half of Vbatt+ and Vbatt-terminal voltage in the pattern 2.Other ratio can be realized by switch more electric capacity of connecting with capacitor C 10 and C11 in phase place 1, and in phase place 2 they all is connected in parallel.For example, 1/3rd of the input cell voltage voltage can be by adopting the series connected battery end and producing at out+ end and 3 electric capacity that the Vbatt-end is connected in parallel.
Similar in negative power supply in second operator scheme (pattern 2) and first operator scheme, capacitor C 12 connect as Fig. 3 B be identical shown in Fig. 3 D.But shown in Fig. 3 C, because switch S 8 is opened in second operator scheme, in the phase place 1 of pattern 2, electric capacity 12 is by as shown in Figure 3A Vbatt+ end in out+ end charging rather than the pattern 1.Switch S 4 makes capacitor C 12 be connected to the out+ end, shown in Fig. 3 C, obtain cathode power supply together with above-mentioned capacitor C 10 and capacitor C 11 are connected in series in phase place 1, and therefore the dependent phase between the out+ voltage that provides of the out-voltage that provides of voltage inverter and circuit must be kept according to description.On the other hand, 8 switches can be utilized, and the connection between capacitor C 10 and the C12 is disconnected.Extra switch can be arranged between electric capacity 12 and the out+ end, and is activated in pattern 2 phase places 1.Same number of switches also can have 7 to be reduced to 6, switch S 3 removed, and with this (Φ 1) Signal-controlled switch S4.But switch S 3 has reduced the impedance of power path in first operator scheme, to reach the maximum voltage/current operator scheme.Therefore, comprising switch S 3 in the circuit can be better.
Details as shown in Figure 4 is for being used as the amplifier control circuit of mode control circuit 12 among Fig. 1.A signal level detector 30, it can be a simulated peak detecting circuit, or the output of indication digital circuit of the analog signal numerical value of some point in audio signal path, this signal level detector 30 is by multiplier 31 amount of being connected to control signals (representing that if signal controlling and signal content all are logarithms adder of multiplier 31 usefulness replaces).A comparator K1 (perhaps Deng Xiao digital comparator), whether the decision signal level surpasses a threshold value V
Ref, and if threshold value is exceeded pattern control and selects signal to be set to high logic level, starts the operator scheme 1 of charge pump, for power amplifier A1 provides a higher power supply.Can in comparator, produce delay for signal level detector 30 suitable time constants, so that pattern 2 can be not selected, unless the peak level of signal is within the predetermined time and/or all be reduced under the threshold value during the voltage delay, thereby stop the mistake of supply voltage control to change.
Optionally, signal level detector 30 can be omitted, the volume controlling level can be directly and threshold value compare, decide power operation pattern and the power amplifier rail supply voltage of this moment.Because signal level control is before the peak level of the expection that is produced once more by power amplifier A1, so in some applications control is enough, especially during known some of peak signal (peak value) level are used, for example when providing audio signal with digital to analog converter integrated in the system.
When power circuit was in operator scheme 2, a selectable circuit responded to voltage peak, and was made up of 33, one delayers 32 of a maintenance-replacement latch and a Signal compressor 34.When mode control signal converts logic high (pattern 1) to by logic low (pattern 2), maintenance-replacement latch 33 is set to maintenance, expires up to the 32 predefined times of delayer.Maintenance-replacement latch 33 is output as pulse signal, and the activation signal compressor reducer 34 at the fixed time, and this scheduled time is exactly the higher needed time of rail power supply numerical value that the rail power supply of power amplifier A1 is stabilized in operator scheme 1.Signal compressor 34 is inserted into before the path intermediate power amplifier A1 of audio signal, and reduces signal level and guarantee that up to the rail power supply that offers amplifier A1 the output voltage swing that is enough to provide required can not produce slicing simultaneously to avoid slicing.
As shown in Figure 5, the described power supply amplification control method of the specific embodiment of the invention, one of them or more than one instruction from the front end signal level offer the operator scheme that mode control circuit 12 is used to select power amplifier power supply, charge pump power supply 10 as shown in fig. 1.MP3 decoding device 50 is exactly a typical digital audio data source, and MP3 decoding device 50 provides control signal, the peak level of shows signal, and it needs the higher voltage-operated pattern of power amplifier, to avoid slicing.Because the MP3 data encode with certain data format, comprising with various forms of gain informations, this gain information can be used for controlling offer power amplifier supply voltage to avoid slicing, under possible situation, save electric weight simultaneously.For example, track metadata comprises peak gain information (playback gain unit), if the signal peak of a certain track or stream is no more than the threshold value of slicing under the supply power voltage of lower-wattage amplifier, then can select the low voltage operating pattern of power amplifier power supply supply to whole track/stream.Under pattern frame by frame, instantaneous frame can be by the size identification of 192 samplings and 576 samplings, and each subband unit comprises the amplitude of scale factor information Control subband and unit decodes audio frequency.Therefore can be in decode procedure the detection peak signal level, and the decision of the voltage amplifier power supply that the peak value needs are higher consigns to power amplifier.
If the more high-tension time that is stabilized in that amplifier power supply is required provides a signal to the peak value detection time of delay that reaches the power amplification output stage greater than MP3 decoding device 50, then can increase delay circuit 52 and produce extra delay, the frequency that it is operated in general FIFO (first-in first-out) memory sample rate perhaps can be the analogue delay that is positioned at the DAC54 in downstream.As a kind of possible alternative of determining peak information from MP3 decoding device 50, a peak detector (digital comparator) 51 optionally is used in combination with delay circuit 52 (as needs), by the output of comparison MP3 decoding device 50 and fixing threshold value, being enough to is providing peak signal to arrive the notice of power amplifier before.At last, if output to the delay of power amplifier from DAC54 enough, the detected value that filters finite impulse response (FIR) (FIR) filter 58 of Delta-Sigma modulator 56 outputs among the DAC54 can provide the enough prior notice more high voltage operation pattern to mode control circuit 12 selective amplifier power supplys.
Invention has been made special explanation to the details in the embodiment, those having ordinary skill in the art will appreciate that foregoing and other forms of variation, other details of not leaving the spirit and scope of detailed description of the present invention all should be thought and belong to the scope of the invention.
Claims (24)
1. one kind is used for providing for Audio-Frequency Transformer the audio-frequency amplifier circuit of output signal, and described audio-frequency amplifier circuit comprises:
A power amplifier has the audio input end that receives audio input signal, the audio output that described output signal is provided, and a pair of rail power connector end;
A power supply is used for that a pair of rail power end provides supply voltage on described power amplifier, and wherein said power supply can be selected power supply voltage level, and the power consumption of described power amplifier reduces when the described amplitude of described audio signal reduces;
A control circuit is used under the indication of described amplitude described audio signal level of control and the described power supply voltage level of selecting, and makes to raise the while when not reaching capacity power supply voltage level again when the described power supply voltage level of selecting, and avoids slicing.
2, audio-frequency amplifier circuit as claimed in claim 1 is characterized in that, described control circuit comprises:
The input of a volume of reception controlling value;
A delay circuit is used to postpone the increase of described volume control value, and has an output, and the control circuit that provides a volume control signal to export described audio frequency amplifier to is gone over up to preset time.
3, audio-frequency amplifier circuit as claimed in claim 1 is characterized in that, described control circuit comprises:
An input is used to receive the amplitude indication of described audio input signal;
A Signal compressor is used for providing described audio input signal to described power amplifier from the signal of audio-source, and wherein said compressor reducer has reduced the dynamic range from the audio input signal of described audio source signal; With
A delay circuit is used for when the amplitude indication of described audio input signal increases, and the activation signal compressor reducer is when described preset time past tense, shutdown signal compressor reducer.
4, audio-frequency amplifier circuit as claimed in claim 1 is characterized in that, control circuit comprises:
An input is used to receive the amplitude indication of described audio input signal;
A gain adjusting circuit is used to adjust the level of described audio input signal, and described gain circuitry reduces the level of described audio input signal when activating; With
A delay circuit activates described gain adjustment circuit when the indication of the amplitude of described audio input signal increases, when described preset time past tense, close gain adjustment circuit.
5, audio-frequency amplifier circuit as claimed in claim 4, it is characterized in that, also comprise the signal level detector, it has an input receiving terminal to be used to receive the input that described audio input signal and output are used to provide described control circuit, and promptly described delay circuit activates the variation that described compressor reducer is used to respond described audio input signal.
6, audio-frequency amplifier circuit as claimed in claim 5, it is characterized in that, also comprise volume control circuit, the described input of described control circuit is received the volume control value of described volume control circuit, and promptly described delay circuit activates the increase that described compressor reducer is used to respond described volume control signal.
7, audio-frequency amplifier circuit as claimed in claim 1, it is characterized in that, described amplitude indication is used for the digital decoder that audio-frequency information is decoded is provided by one, thereby provide described audio input signal, be that described digital decoder provided described amplitude indication before described audio signal appropriate section arrives, described control circuit was according to the described optional supply voltage of the raising of the corresponding amplitude of described audio signal before promptly described amplitude increased arrival accordingly.
8, audio-frequency amplifier circuit as claimed in claim 7, it is characterized in that, the time of delay between the described appropriate section of indication of described amplitude and described audio signal arrives greater than or when equaling described supply voltage in fact and increasing and described supply voltage be stabilized in the needed time of higher level.
9, a kind of method that provides the amplifier of power output to raise the efficiency for audio converter is characterized in that, comprising:
Receive the amplitude of described amplifier amplifying signal;
There is the power supply of optional power supply voltage level to offer described amplifier by one a supply voltage; With
Control described signal level and select described power supply voltage level according to described amplitude.
10, method as claimed in claim 9, it is characterized in that, described amplitude is the volume control value of a described signal volume of control, and further comprises the increase that postpones the controlled volume of described signal, and one section preset time is gone over behind the higher supply voltage of selecting.
11, method as claimed in claim 9 is characterized in that, described control is included in selects a higher power supply voltage level to adjust gain to a lower yield value of described signal in one period scheduled time afterwards.
12, method as claimed in claim 9 is characterized in that, described control is included in selects more described signal of compression in the preset time after the high power supply voltage level.
13, method as claimed in claim 12 is characterized in that, further comprises detecting described signal level, and when described compression began, a higher supply voltage was selected in control.
14, method as claimed in claim 13 is characterized in that, further comprises:
The input that volume of reception control is adjusted;
The volume of adjusting described signal is consistent with described reception; With
Determine that whether described volume control is adjusted is the volume that increases described signal, and a higher supply voltage is selected in indication; With
Determine accordingly to select a higher supply voltage, select described higher supply voltage, and in the back preset time of selection, compress described signal.
15, method as claimed in claim 9 is characterized in that, further comprises:
The numeral of the described signal of decoding representative;
Detect the amplitude peak in the current described decoded signal, and select described power supply voltage level to increase supply voltage according to the described amplitude peak control of described detection.
16, method as claimed in claim 15, it is characterized in that, the described amplitude peak of detection before the corresponding part of described signal arrives described amplifier that is to say that supply voltage is stabilized in a higher set point value before corresponding described peak value arrives described amplifier.
17, a kind of audio-frequency amplifier circuit that is used for providing output signal for Audio-Frequency Transformer, described audio-frequency amplifier circuit comprises:
A signal processing circuit is to provide the early stage amplitude of a source audio signal and described source audio signal;
A power amplifier has the audio input end of reception sources audio input signal, the audio output that described output signal is provided, and a pair of rail power connector end;
A power supply is used for that a pair of rail power end provides supply voltage on described power amplifier, and wherein said power supply can be selected power supply voltage level, and the electric consumption of described power amplifier reduces when the described amplitude of described audio signal reduces;
A control circuit, be used for the described power supply voltage level of selecting of control under the indication of described early stage amplitude, described early stage amplitude provides the peak value in the audio signal of described source, thereby make to raise the while when not reaching capacity power supply voltage level again when the described power supply voltage level of selecting, can avoid slicing.
18, voicefrequency circuit as claimed in claim 17 is characterized in that, described signal processing circuit comprises the digital audio decoding device, and it comprises and is used to provide early stage amplitude to detect output to the peak value of described control circuit.
19, voicefrequency circuit as claimed in claim 17, it is characterized in that, described signal processing circuit comprises a delay circuit, be used in a predetermined time of delay, postponing described source audio signal, promptly at least in described scheduled delay, before the audio signal of source, provide an early stage amplitude.
20, voicefrequency circuit as claimed in claim 17 is characterized in that, described signal processing circuit comprises a digital to analog converter that comprises digital filter, and the logical block of described digital filter provides early stage amplitude.
21, a kind of method that provides the amplifier of power output to raise the efficiency for audio converter is characterized in that, comprising:
Receive the early stage amplitude of described amplifier amplifying signal;
There is the power supply of optional power supply voltage level to offer described amplifier by one a supply voltage; With
Select described power supply voltage level according to described early stage amplitude, thereby it is stable to make that the selected power supply voltage level that increases was enough to before the peak value of described signal arrives described amplifier.
22, method as claimed in claim 21 is characterized in that, further comprises:
Decode one the representative described signal digital coding; With
Obtain described early stage amplitude from the intermediate object program of described decoding.
23, method as claimed in claim 21 is characterized in that, further comprises:
Determine whether described signal amplitude value has surpassed a predetermined value;
If described signal amplitude value has surpassed predetermined value then has produced early stage amplitude; With
With predetermined time of delay of described signal delay, before arriving described amplifier, the peak value of described signal produces described early stage amplitude in the described at least preset time.
24, method as claimed in claim 21 is characterized in that, further comprises from an intermediate object program of the digital filtering of the digital to analog converter that described signal become analog signal producing described amplitude.
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| Application Number | Priority Date | Filing Date | Title |
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| US82303606P | 2006-08-21 | 2006-08-21 | |
| US60/823,036 | 2006-08-21 | ||
| US11/610,496 | 2006-12-13 | ||
| US11/611,069 | 2006-12-14 |
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| CN101507105A true CN101507105A (en) | 2009-08-12 |
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| CN200780030932.9A Active CN101507104B (en) | 2006-08-21 | 2007-08-16 | Energy-efficient consumer device audio power output stage and method of using the same |
| CNA2007800309333A Pending CN101507105A (en) | 2006-08-21 | 2007-08-16 | Method and apparatus for controlling a selectable voltage audio power output stage |
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2007
- 2007-08-16 CN CN200780030932.9A patent/CN101507104B/en active Active
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| Publication number | Publication date |
|---|---|
| CN101507104A (en) | 2009-08-12 |
| CN101507104B (en) | 2013-05-08 |
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Application publication date: 20090812 |