CN1325181A - Digital dynamic aplifier biasing method and device - Google Patents
Digital dynamic aplifier biasing method and device Download PDFInfo
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- CN1325181A CN1325181A CN 00115750 CN00115750A CN1325181A CN 1325181 A CN1325181 A CN 1325181A CN 00115750 CN00115750 CN 00115750 CN 00115750 A CN00115750 A CN 00115750A CN 1325181 A CN1325181 A CN 1325181A
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Abstract
The present invention provides an amplifier digital dynamic biasing method and its apparatus. Said method includes: (a) storing digital voice-frequency signal into memory; (b) fetching a part of digital voice-frequency signal from memory; (c) finding out the peak value from said fetched digital voice-frequency signal part; (d) according to said peak value calculating out powr tube bias ensuring that said part of voice-frequency signal has no distortion output; (e) adding said bias on the described power tube, and taking out said part of voice-frequency signal from memory, after D/A conversion, transferring said part of voice-frequency signal into signal input end of described power tube; and (f) repeating these steps.
Description
The present invention relates to a kind of digital dynamic biasing means and device thereof of amplifier.
The power tube of existing amplifier (is example with the audio frequency amplifier) is generally operational in two kinds of operating states, i.e. Class A or class AB.These two kinds of operating states respectively have pluses and minuses: the biasing of class AB amplifier is moderate, so quiescent dissipation is less, and high efficiency (being about 78%).But there is certain distortion in its output signal.Because the power amplifier cost lower (because of its power consumption is little, not high to requirement on devices such as power tube parameter, radiators) of class AB is so its application is comparatively extensive.The biasing of class A amplifier is very high, and quiescent dissipation can reach multikilowatt, and its operating efficiency generally has only about 10%, and lot of energy all is converted into heat energy and wastes.But for input signal arbitrarily, class A power amplifier always worker's power tube is operated in the linear zone, so its output effect the best.Because it is with high costs, class A power amplifier only just uses in exigent amplifier.In addition, except above two kinds of main flow power amplifiers, also have super Class A and T class power amplifier.The biasing of the power tube of super class A amplifier changes along with the variation of signal, and it is big to setover when signal is big, and signal hour biasing is little, thereby reaches the purpose that reduces power consumption.But,, make control signal lag behind input signal because its control circuit employing is analog circuit.When input signal is dynamically big, the variation of biasing will not catch up with the variation of signal, thereby produce distortion.Super class a audio power amplifier quiescent dissipation and class AB power amplifier are similar, but its operating efficiency is than high many in Class A, and output effect is between Class A and class AB.
In sum, traditional Class A and class AB power amplifier since the biasing of its power amplifier tube fix.Therefore, otherwise biasing be provided with higher, waste more electric energy (class A amplifier) in the hope of obtaining higher amplification performance, otherwise biasing be provided with lower, with the sacrifice amplification performance.Though the biasing of super its power amplifier tube of class A amplifier changes along with signal, owing to adopt simulated mode to adjust, therefore, there are control hysteresis, poor effect, easily produce shortcoming such as distortion.
Therefore, the object of the present invention is to provide a kind of digital dynamic biasing means of amplifier, this method can record the information of input signal in advance, dynamically adjusts the biasing of the power amplifier tube in the amplifier on this basis, thereby guarantees adjustment and be exaggerated signal synchronous.
Another object of the present invention is to provide a kind of amplifier numeral dynamic bias device that utilizes above-mentioned digital dynamic biasing means.
So purpose of the present invention, digital dynamic aplifier biasing method of the present invention comprises the following steps:
(a) digital audio and video signals is stored in the memory;
(b) from memory, read a piece of digital audio signal;
(c) from this piece of digital audio signal that reads, find out its peak value;
(d) calculate the biasing that guarantees that this section audio signal is exported undistorted power tube according to this peak meter;
(e) this biasing is added on the described power tube, simultaneously, from memory, takes out this section audio signal, through being input to the signal input part of described power tube behind the D/A switch;
(f) repeat these steps.
Digital dynamic aplifier biasing method of the present invention after above-mentioned steps (a), also comprises and step (b) and the following step of (c) carrying out simultaneously:
(b1) from memory, read back one piece of digital audio signal;
(c1) from a back section audio signal that reads, find out its peak value;
Then, the peak value of the peak value of this piece of digital audio signal of relatively finding out in step (c) in step (d) and the back piece of digital audio signal found out in step (c1) is calculated the biasing that guarantees that this section audio signal is exported undistorted power tube according to peak meter bigger among both.
Amplifier numeral dynamic bias device provided by the invention comprises:
Audio data memory is used to store digital audio and video signals;
Writing station receives described digital audio and video signals, and described digital audio and video signals is stored in the described audio data memory;
Reading device links to each other with described audio data memory, is used for reading a piece of digital audio signal from described audio data memory;
Data processor receives the piece of digital audio signal that described reading device reads, and therefrom finds out the peak value in this piece of digital audio signal;
The biasing output translator, link to each other with described data processor, peak value according to this piece of digital audio signal of described data processor output calculates the biasing that guarantees that this section audio signal is exported undistorted power tube, and exports this biasing to the power tube of level thereafter;
D/A links to each other with the output of described data processor, is used for converting this piece of digital audio signal of described data processor output to analog signal, and offers the power tube of back level.
Amplifier numeral dynamic bias device of the present invention also comprises:
Second reading device reads back one piece of digital audio signal from described audio data memory;
Second data processor receives the back piece of digital audio signal that described second reading device reads, and therefrom finds out the peak value in this back one piece of digital audio signal;
Comparator, link to each other with described second data processor with described data processor, the peak value of this back one piece of digital audio signal of the peak value of this piece of digital audio signal of reception and more described data processor and described second data processor is exported to the biasing output translator with wherein bigger peak value.
As mentioned above, because the present invention adopted digitized dynamic bias adjustment technology, therefore, can make the amplifying signal of the biasing of amplifier and input synchronous, thereby solve the contradiction of power tube operating state and output effect.That is, both reduce the quiescent dissipation of power amplifier, guaranteed the amplification performance of power amplifier again.
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.Wherein:
Fig. 1 is the flow chart of digital dynamic aplifier biasing method of the present invention;
Fig. 2 is the flow chart of another embodiment of digital dynamic aplifier biasing method of the present invention;
Fig. 3 is the block diagram of amplifier numeral dynamic bias device of the present invention;
Fig. 4 is the block diagram of another embodiment of the digital dynamic bias unit of amplifier of the present invention.
The embodiment of digital dynamic biasing means of the present invention is described below in conjunction with Fig. 1.
Fig. 1 is the flow chart of digital dynamic biasing means of the present invention.Referring to shown in Figure 1,, receive the digital audio and video signals of input, and store in the memory at first at step S1; At step S2, from the memory that stores digital audio and video signals, read a piece of digital audio signal then.Flow process enters into step S3, finds out its maximum from this piece of digital audio signal that reads, i.e. peak value; Calculate the biasing (step S4) that guarantees that this section audio signal is exported undistorted power tube according to this peak meter then.At step S5, the biasing of this piece of digital audio signal that step S4 is calculated is added on the power tube.After step S2 reads a piece of digital audio signal, in step S3, S4 and S5, step S6 will read this piece of digital audio signal and carry out D/A switch, convert this piece of digital audio signal to simulated audio signal, output to the signal input part of power tube then at step S7.Step S6 and step S7 carry out simultaneously, and like this, just the biasing that can guarantee to be added on the power tube just in time adapts with the simulated audio signal that outputs on the power tube, so that amplify this audio signal with the amplification performance of the best, thereby reduce distortion.
In the present embodiment, the scope of the sound frequency that can hear according to transistorized response time and people's ear, the length of a piece of digital audio signal that is read generally can be chosen between the 10ms to 200ms, and preferable scope is at 50ms to 100ms.
In flow process shown in Figure 1, between step S1, can also increase a digital audio and video signals switch process (not shown in figure 1).Because the form of some digital audio and video signals is different or process coding or compression, therefore, is utilizing between such digital audio and video signals and must change it, this conversion comprises format conversion, decoding or decompression, converts serial data to.
Fig. 2 illustrates the flow chart of another embodiment of digital dynamic aplifier biasing method of the present invention.Present embodiment is the improvement on basis embodiment illustrated in fig. 1.Its flow process is to have increased some steps on the basis of the embodiment of Fig. 1.Promptly in step S2, step S21 reads back one piece of digital audio signal, and S3 is identical with step, at step S31, finds out its peak value from a back piece of digital audio signal that reads; Then at step S8, the peak value of the peak value of this piece of digital audio signal of finding out at step S3 and the back piece of digital audio signal found out at step S31 relatively, take out both higher values, get back to step S4 then, according to the bigger peak value calculating biasing of step S8 output.Other step is similar to flow process shown in Figure 1.
Briefly, exactly come the bias of rated output pipe, be used for amplifying digital audio and video signals the last period of adjacent two piece of digital audio signals according to largest peaks in the adjacent two piece of digital audio signals.The purpose of doing like this is: when realizing that biasing is dynamically adjusted, if the variation of two sections of front and back is bigger, then might cause back one section biasing not adjust to the right place in time, thereby produce distortion when amplifying back one segment signal.Present embodiment is exactly in order to address this problem.
Describe digital dynamic biasing means of the present invention above, described the digital dynamic bias unit that utilizes above-mentioned digital dynamic biasing means below in detail.
Fig. 3 shows the block diagram of amplifier numeral dynamic bias device of the present invention.As shown in Figure 3, amplifier numeral dynamic bias device of the present invention includes:
Audio data memory 10 is used to store digital audio and video signals, and audio data memory 10 can be a random access memory;
Writing station 10, writing station 10 receives digital audio and video signals, these digital audio and video signals are written to (corresponding to the step S1 among Fig. 1) in the audio data memory 10, the digital audio and video signals that writing station 10 receives is the serial voice data, audio signal or voice data for different-format through encoding or compressing, need a conversion equipment (not shown) to change, this conversion comprises format conversion, decoding or decompression, converts serial data to;
Data processor 40 receives its piece of digital audio signal that reads from reading device 30, and this piece of digital audio signal is handled, and finds out maximum from this piece of digital audio signal, i.e. peak value;
Biasing output translator 50, this biasing output translator 50 receives the peak value of described data processor 40 outputs, calculate the biasing that guarantees that this section audio signal is exported undistorted power tube according to this peak meter, and to thereafter these biasings of power tube 70 output, this biasing output translator 50 can be realized with digital varistor or D/A, this realization does not need creative work for the general personnel in present technique field, therefore, be not described in detail at this;
D/A 60, the digital audio and video signals that data processor 40 is exported converts analog signal to, offers the signal input part of the power tube 70 of back level, is amplified by power tube 70.
Fig. 4 shows the block diagram of another embodiment of the digital dynamic bias unit of amplifier of the present invention.The embodiment of Fig. 4 is corresponding to the method for Fig. 2.
As shown in Figure 4, the amplifier of this embodiment numeral dynamic bias device includes:
Audio data memory 10 is used to store digital audio and video signals, and audio data memory 10 can be a random access memory;
Writing station 10, writing station 10 receives digital audio and video signals, these digital audio and video signals are written to (corresponding to the step S1 among Fig. 1) in the audio data memory 10, the digital audio and video signals that writing station 10 receives is the serial voice data, audio signal or voice data for different-format through encoding or compressing, need a conversion equipment (not shown) to change, this conversion comprises format conversion, decoding or decompression, converts serial data to;
Data processor 40 receives its piece of digital audio signal that reads from reading device 30, and this piece of digital audio signal is handled, and finds out maximum from this piece of digital audio signal, i.e. peak value;
First reading device, 31, the first reading devices 31 read back one piece of digital audio signal from audio data memory 10;
First data processor 41 receives its back piece of digital audio signal that reads from first reading device 31, and this back one piece of digital audio signal is handled, and finds out maximum from this back one piece of digital audio signal, i.e. peak value;
Comparator 80, the peak value (maximum) in the back piece of digital audio signal of peak value (maximum) in this piece of digital audio signal of reception and 40 outputs of comparing data processor and 41 outputs of first data processor is exported the peak value greatly among both;
Biasing output translator 50, this biasing output translator 50 receives the big peak value of described comparator 80 outputs, calculate the biasing that guarantees that this section audio signal is exported undistorted power tube according to this big peak meter, and to thereafter these biasings of power tube 70 output, this biasing output translator 50 can be realized with digital varistor or D/A, this realization does not need creative work for the general personnel in present technique field, therefore, be not described in detail at this;
D/A 60, the digital audio and video signals that data processor 40 is exported converts analog signal to, offers the signal input part of the power tube 70 of back level, is amplified by power tube 70.
In the above embodiments, writing station 20, reading device 30,31, data processor 40 and 41 and comparator 80 can utilize high speed microprocessor (MCU) to realize by programming.
Claims (8)
1, a kind of digital dynamic aplifier biasing method comprises the following steps:
(a) digital audio and video signals is stored in the memory;
(b) from memory, read a piece of digital audio signal;
(c) from this piece of digital audio signal that reads, find out its peak value;
(d) calculate the biasing that guarantees that this section audio signal is exported undistorted power tube according to this peak meter;
(e) this biasing is added on the described power tube, simultaneously, from memory, takes out this section audio signal, through being input to the signal input part of described power tube behind the D/A switch;
(f) repeat these steps.
2, digital dynamic aplifier biasing method as claimed in claim 1 is characterized in that,
After above-mentioned steps (a), also comprise and step (b) and the following step of (c) carrying out simultaneously:
(b1) from memory, read back one piece of digital audio signal;
(c1) from a back section audio signal that reads, find out its peak value;
Then, the peak value of the peak value of this piece of digital audio signal of relatively finding out in step (c) in step (d) and the back piece of digital audio signal found out in step (c1) is calculated the biasing that guarantees that this section audio signal is exported undistorted power tube according to peak meter bigger among both.
3, digital dynamic aplifier biasing method as claimed in claim 1 or 2 is characterized in that, the length of a described piece of digital audio signal is between 10ms to 200ms.
4, digital dynamic aplifier biasing method as claimed in claim 3 is characterized in that, the length of a described piece of digital audio signal is between 50ms to 100ms.
5, a kind of amplifier numeral dynamic bias device is characterized in that, comprising:
Audio data memory is used to store digital audio and video signals;
Writing station receives described digital audio and video signals, and described digital audio and video signals is stored in the described audio data memory;
Reading device links to each other with described audio data memory, is used for reading a piece of digital audio signal from described audio data memory;
Data processor receives the piece of digital audio signal that described reading device reads, and therefrom finds out the peak value in this piece of digital audio signal;
The biasing output translator, link to each other with described data processor, peak value according to this piece of digital audio signal of described data processor output calculates the biasing that guarantees that this section audio signal is exported undistorted power tube, and exports this biasing to the power tube of level thereafter;
D/A links to each other with the output of described data processor, is used for converting this piece of digital audio signal of described data processor output to analog signal, and offers the power tube of back level.
6, amplifier numeral dynamic bias device as claimed in claim 4 is characterized in that, also comprises:
Second reading device reads back one piece of digital audio signal from described audio data memory;
Second data processor receives the back piece of digital audio signal that described second reading device reads, and therefrom finds out the peak value in this back one piece of digital audio signal;
Comparator, link to each other with described second data processor with described data processor, the peak value of this back one piece of digital audio signal of the peak value of this piece of digital audio signal of reception and more described data processor and described second data processor is exported to the biasing output translator with wherein bigger peak value.
7, as claim 4 or 5 described amplifier numeral dynamic bias devices, it is characterized in that the length of a described piece of digital audio signal is between 10ms to 200ms.
8, amplifier numeral dynamic bias device as claimed in claim 7 is characterized in that the length of a described piece of digital audio signal is between 50ms to 100ms.
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| CN 00115750 CN1325181A (en) | 2000-05-18 | 2000-05-18 | Digital dynamic aplifier biasing method and device |
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| CN 00115750 CN1325181A (en) | 2000-05-18 | 2000-05-18 | Digital dynamic aplifier biasing method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944894A (en) * | 2010-08-31 | 2011-01-12 | 无锡比迅科技有限公司 | Comparator with dynamic offset control |
| US10727788B2 (en) | 2015-08-14 | 2020-07-28 | Viasat, Inc. | Digital dynamic bias circuit |
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2000
- 2000-05-18 CN CN 00115750 patent/CN1325181A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944894A (en) * | 2010-08-31 | 2011-01-12 | 无锡比迅科技有限公司 | Comparator with dynamic offset control |
| US10727788B2 (en) | 2015-08-14 | 2020-07-28 | Viasat, Inc. | Digital dynamic bias circuit |
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