CN1270449A - Method and device for automatically selecting signal source of audio and video amplifier - Google Patents
Method and device for automatically selecting signal source of audio and video amplifier Download PDFInfo
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Abstract
An automatic selector of signal source for AV amplifier is composed, of more signal sources, the first and the second switches, A/D converter and CPU. The first switch continuously scans the signal sources. The A/D converter samples the signal sources scanned by the first switch, converts them into digital signals and inputs them to CPU for analyzation and processing. The second switch is connected with said signal sources and locks-up one of the signal sources. The CPU calculates the values sampled by A/D converter and controls the first and the second switches according to calculation result. The program can be watched by user operating signal source just.
Description
The present invention relates to audio frequency and video (AV) amplifier in the stereo set, especially relate to control system of selection and device with a plurality of audio frequency and videos (AV) signal source.
Home theater (also claiming AV system of family) is made up of AV signal source, AV amplifier and AV terminal three big units.The AV signal source is used to provide the pictures and sounds signal, and existing signal source equipment is varied, and CD-audio player, the little video disc player of VCD laser, LD Laser disc machine, DVD digital laser video disc player, TAPE magnetic tape station and VTR video tape recorder or the like are arranged.The AV signal source is connected with the AV amplifier by various input terminals.The AV amplifier generally is made up of signal source selector 1, signal processor 2 and power amplifier 3 etc., as shown in Figure 1.Signal source selector 1 is to select one road signal to send into back level (as signal processor 2, power amplifier 3 and audio video synchronization intensifier circuit 4) from multipath signal source (as CD, VCD, LD, DVD, VTR), closes other signal source passages simultaneously, has interlocking capability.Signal source selector 101 has mechanical switching regulator and electronic switch type two classes, and the 100th～102 page has detailed introduction to this two classes diverter switch in " sound technique/Wang Xicheng chief editor, publishing house of Xian Electronics Science and Technology University, 1998 " book.Which kind of switch no matter all needs manual operation, artificially selects to be switched on or switched off various signal sources.When each signal source changed, the user will carry out two selection operations, and one is with the signal source equipment start, and another is to pass through switch switch selection signal source on the AV amplifier, operates loaded down with trivial details.If signal source is switched when frequent, the loaded down with trivial details operation meeting of AV amplifier brings a lot of inconvenience to the user.
First purpose of the present invention is to propose a kind of method that is used for the intelligent automatic selection signal source of AV amplifier at simulation signal generator.
Second purpose of the present invention is to realize the automatic selector of signal source of above-mentioned first purpose method.
The 3rd purpose of the present invention is to propose a kind of method that is used for the intelligent automatic selection signal source of AV amplifier at derived digital signal.
The 4th purpose of the present invention is to realize the automatic selector of signal source of above-mentioned the 3rd purpose method.
For realizing first goal of the invention, at simulation signal generator, the method that the present invention is used for the automatic selecting signal source of AV amplifier may further comprise the steps:
1, initialization, i=0;
2, the input channel of all signal sources of continuous sweep;
3, each signal source passage is sampled, be converted to input microprocessor CPU after the digital signal;
4, CPU calculates sampled value;
5,, judge that certain road signalling channel has no signal output according to the result of calculation of step 4; If each signal
Equal no signal output of passage and i=0 then return step 2; If the equal no signal of each signalling channel is defeated
Go out and i＞0, then execution in step 7; If certain paths has signal output, then i=i+1 carries out the step
Rapid 6;
6, this signal source of CPU control locking, and start main power source;
7, scanning other signal source passage except that the signal source of locked mistake once returns step 3.
For realizing second goal of the invention, the present invention is used for the automatic selector of signal source of AV amplifier, comprising:
A plurality of signal sources, wherein each is all in order to produce a kind of analog signal;
First electronic switch links to each other with described a plurality of signal sources, carries out continuous sweep in order to the input channel to described a plurality of signal sources;
Analog to digital converter, in order to each signal source of described first electronic switch scanning is sampled, be converted to digital signal after input microprocessor CPU carry out analyzing and processing;
Second electronic switch also links to each other with described a plurality of signal sources, in order to some locking the in described a plurality of signal sources, audio/video signal is imported post processing electric circuit, and amplifies output;
Microprocessor CPU is in order to the sampled value of analog to digital converter output is calculated, according to the analysis result of sampled value being controlled described first electronic switch, second electronic switch.
For realizing the 3rd goal of the invention, at derived digital signal, the method that the present invention is used for the automatic selecting signal source of AV amplifier may further comprise the steps:
1, the input signal in received signal source;
2, produce the format identification signal according to received signal, and send into microprocessor;
3, microprocessor is according to locking reception, the digital signal of different format identification signal controlling digital signals
Processing, digital-to-analogue conversion.
For realizing the 4th goal of the invention, the present invention is used for the automatic selector of signal source of AV amplifier, comprising:
A plurality of signal sources, wherein each is all in order to produce a kind of digital signal;
Digit signal receiver, in order to receiving the digital signal of described signal source, and the format identification signal that produces corresponding format sends into microprocessor and digital signal processing module, and accepts the control of microprocessor;
Digital signal processing module is handled in order to the signal that described digit signal receiver is transmitted, and accepts the control of microprocessor;
The multi-channel digital and analogue transducer converts analog signal in order to the digital signal that described digital signal processing module is transmitted, and accepts the control of microprocessor;
Microprocessor in order to receiving the format identification signal of the corresponding format that described digit signal receiver transmits, and is controlled described digit signal receiver, digital signal processing module, multi-channel digital and analogue transducer.
Because adopt first electronic switch that a plurality of signal sources input port is successively scanned, microprocessor is judged the wherein on-state of certain signal source according to the analysis result of sampled signal, and controls second electronic switch automatically and select this signal source.The present invention compared with prior art, its remarkable advantage is that the user is when AV signal sources such as use CD, VCD, DVD, LD, can appreciate program as long as operate CD, VCD, DVD, LD or other signal source, need not carry out any start operation to the AV amplifier again, operate quite simple and convenient.The present invention makes the AV amplifier accomplish the intelligent selection signal source.
Below in conjunction with accompanying drawing and by specific embodiment the present invention is done further detailed explanation.
Fig. 1 is the block diagram of AV amplifier;
Fig. 2 is the block diagram of simulation signal generator automatic dialing unit of the present invention;
Fig. 3 is the operational flowchart of automatic selector of signal source shown in Figure 2;
Fig. 4 is the block diagram of derived digital signal automatic dialing unit of the present invention.
Embodiment one:
Referring to Fig. 2, (effect of buffer circuit is that digital circuits such as electronic switch SW101, modulus a/d transducer and CPU and input analog signal loop are separated through buffer circuit 103 for a plurality of signal source CD, VCD, LD, DVD, TAPE, avoid digital noise is introduced the music signal passage) link to each other with electronic switch SW101, electronic switch SW101 continuously scans a plurality of signal source CD, VCD, LD, DVD, TAPE input port.Modulus converter A/D is sampled to each signal source of electronic switch SW101 scanning, be converted to digital signal after input microprocessor CPU carry out analyzing and processing.Electronic switch SW102 also links to each other with signal source CD, VCD, LD, DVD, TAPE, and this switch locks selection according to the instruction of CPU to certain signal source, and audio/video signal is imported post processing electric circuit, and amplifies output.CPU is the control centre of whole device, and it is according to the working method of the analysis and judgement result of sampled value being controlled switch SW 101, SW102 and main power source control circuit 104.Electronic switch SW101, SW102 and microprocessor CPU power consumption are minimum, provide work by accessory power supply 105.
For each signal source, microprocessor CPU averages its per 10 times sampled value, and more adjacent two mean values, if the difference of two mean values is greater than a certain empirical value, usually this threshold value is taken as 30, then CPU judges the input of AV signal data stream, and control electronic switch SW102 locks this signal source.Be exemplified below:
| Signal source | ????CD | ????VCD | ????LD | ????DVD | ????TAPE |
| First 10 sample means | ????20 | ????30 | ????25 | ????30 | ????33 |
| Second 10 sample mean | ????28 | ????35 | ????30 | ????28 | ????30 |
| The 3rd 10 sample means | ????27 | ????25 | ????29 | ????35 | ????36 |
| The 4th 10 sample means | ????31 | ????70 | ????34 | ????32 | ????30 |
Wherein, the 4th 10 sample means 70 and the 3rd 10 sample means 25 of signal source VCD differ 45, greater than setting threshold 30, be that data volume in the VCD signalling channel has significant sudden change, this moment, CPU judged that promptly VCD has signal output, the VCD of control switch SW102 locking immediately passage, as shown in Figure 2.
The control signal of CPU output is simultaneously given main power source control circuit 105, opens main power source, for the work of AV amplifier related circuit.This moment, the user just can appreciate the VCD program.
Then, 101 remaining four signal source: CD, LD, DVD, TAPE of scanning of switch SW, modulus converter A/D and CPU still sample and computational analysis, and data are as follows:
| Signal source | ????CD | ????LD | ????DVD | ????TAPE |
| First 10 sample means | ????30 | ????28 | ????35 | ????32 |
| Second 10 sample mean | ????35 | ????31 | ????28 | ????28 |
| The 3rd 10 sample means | ????32 | ????28 | ????35 | ????30 |
| ?????????… | ????… | ????… | ????… | ????… |
| The 99th 10 sample means | ????33 | ????35 | ????28 | ????28 |
| The 100th 10 sample means | ????73 | ????33 | ????30 | ????27 |
The 100th 10 sample means 73 and the 99th 10 sample means 33 of signal source CD differ 40, greater than setting threshold 30, be that data volume in the CD signalling channel has significant sudden change, this moment, CPU judged that promptly CD has signal output (illustrating that the user is just at the play CD program), and CPU control switch SW102 immediately switches to the CD passage from the VCD passage.
Consider the influence of possible burst noise, the calculating of mean value can be taked to remove a peak, remove a minimum, calculates remaining 8 times mean value again.
The setting of threshold value is relevant with the signal to noise ratio of this machine usually.
Referring to Fig. 3, there is shown the flow process that automatic selector of signal source of the present invention is operated.
After flow process begins, initial pointer i=0.
Execution in step 301, the input channel of all signal sources of electronic switch SW101 continuous sweep (as CD, VCD, LD, DVD, TAPE).
In step 302, modulus converter A/D is then sampled to each signal source of electronic switch SW101 scanning, be converted to digital signal after input microprocessor CPU carry out analyzing and processing.
In step 303, CPU calculates sampled value.
In step 304,, judge that certain road signalling channel has no signal output according to the result of calculation of step 303; If equal no signal output of each signalling channel and i=0 then return step 301; If equal no signal output of each signalling channel and i＞0, then execution in step 306; If certain paths has signal output, i=i+1 then, execution in step 305.
In step 305, CPU control electronic switch SW102 locks this signal source, and starts main power source.
In step 306, electronic switch SW101 scanning other signal source passage except that the signal source of locked mistake once returns step 302.
As from the foregoing, when the user changed the acoustic signal source, CU just chose automatically according to the data control switch SW102 that sampling obtains, need not the manual operation button.
Present embodiment provides manual switchover: in case the human intervention that the AV amplifier receives instruction, all are as the criterion with manual intervention, till shutdown.Embodiment two:
The present embodiment device equally as shown in Figure 2, but CPU is to criterion that whether the signal input is arranged and embodiment one difference to some extent: for each signal source, microprocessor CPU averages its per 10 times sampled value, if continuous 5 mean value is all greater than a certain empirical value, usually this threshold value is taken as 50, then CPU judges the input of AV signal data stream, and control electronic switch SW102 locks this signal source passage.
Be exemplified below:
| Signal source | ????CD | ????VCD | ????LD | ????DVD | ????TAPE |
| First 10 sample means | ????20 | ????30 | ????25 | ????30 | ????33 |
| Second 10 sample mean | ????28 | ????35 | ????30 | ????28 | ????30 |
| The 3rd 10 sample means | ????27 | ????25 | ????29 | ????35 | ????36 |
| The 4th 10 sample means | ????31 | ????70 | ????34 | ????32 | ????30 |
| The 5th 10 sample means | ????32 | ????72 | ????33 | ????31 | ????26 |
| The 6th 10 sample means | ????28 | ????76 | ????30 | ????29 | ????27 |
| The 7th 10 sample means | ????26 | ????80 | ????28 | ????27 | ????25 |
| The 8th 10 sample means | ????29 | ????85 | ????31 | ????30 | ????28 |
Wherein, the 4th to the 8th 10 sample means 70,72,76,80,85 (continuous 5) of signal source VCD are all greater than setting threshold 50, be that data value in the VCD signalling channel has and improves continuously significantly, can get rid of be noise institute extremely, this moment, CPU judged that promptly VCD has signal output, the VCD of control switch SW102 locking immediately passage, as shown in Figure 2.
The control signal of CPU output is simultaneously given main power source control circuit 105, opens main power source, for the work of AV amplifier related circuit.This moment, the user just can appreciate the VCD program.
The same with embodiment one, switch SW 101 is remaining four signal source: CD, LD, DVD, the TAPE of scanning then, and modulus converter A/D and CPU still sample and computational analysis, and data are as follows:
| Signal source | ????CD | ????LD | ????DVD | ????TAPE |
| First 10 sample means | ????30 | ????28 | ????35 | ????32 |
| Second 10 sample mean | ????35 | ????31 | ????28 | ????28 |
| The 3rd 10 sample means | ????32 | ????28 | ????35 | ????30 |
| ?????????… | ????… | ????… | ????… | ????… |
| The 99th 10 sample means | ????33 | ????35 | ????28 | ????28 |
| The 100th 10 sample means | ????73 | ????33 | ????30 | ????27 |
| The 101st 10 sample means | ????74 | ????32 | ????32 | ????30 |
| The 102nd 10 sample means | ????76 | ????29 | ????29 | ????27 |
| The 103rd 10 sample means | ????79 | ????28 | ????25 | ????29 |
| The 104th 10 sample means | ????81 | ????25 | ????30 | ????28 |
The the 100th to 104 sample mean 73,74,76,79,81 (continuous 5) of signal source CD is all greater than setting threshold 50, be that data value in the CD signalling channel has and promotes continuously significantly, this moment, CPU judged that promptly CD has signal output (illustrating that the user is just at the play CD program), and CPU control switch SW102 immediately switches to the CD passage from the VCD passage.
Consider the influence of possible burst noise, the calculating of mean value can be taked to remove a peak equally, remove a minimum, calculates remaining 8 times mean value again.
The setting of threshold value is relevant with the signal to noise ratio of this machine usually.
The flow chart of present embodiment still as shown in Figure 3.Embodiment three:
More than two examples at simulation signal generator.Along with the development of technology, audio-video device also adopts derived digital signal more and more, nearly all is equipped with digital fiber output or the output of digital coaxial cable as LD, DVD, CD, SACD, MD etc.
At derived digital signal, apparatus of the present invention as shown in Figure 4.A plurality of derived digital signals 401,402,403,404 link to each other with digit signal receiver 405 by optical fiber or coaxial cable, digit signal receiver 405 sends the digital signal that receives to DSP (Digital Signal Processing) module 406, enter multi-channel d/a converter 407 again, send into multichannel voice frequency power amplifier 408 after converting analog signal to.Digit signal receiver 405 produces different format identification signals according to different digital signals format and gives CPU, for example imports the CD signal, and the format identification signal is: linear PCM; Be input as DVD multichannel film audio signal, the format identification signal is: the PCM of compression.The different format identification signal controlling that microprocessor CPU is sent here according to receiver 405 is carried out corresponding D SP processing, D/A conversion.
For example, the user opens digital CD disc player, this moment, digit signal receiver 405 generation linear PCM format identification signals sent CPU to, CPU is controlling receiver 405 locking channels 401 in view of the above, and unlatching main power source control circuit 104, be DSP module 406, multi-channel d/a converter 407,408 power supplies of multichannel voice frequency power amplifier, controlling the working method of DSP module 406, multi-channel d/a converter 407 simultaneously.As seen CPU is the control centre of whole device equally.Digit signal receiver 405, microprocessor CPU power consumption are minimum, provide work by accessory power supply (not drawing among the figure).
If the user opens DVD multichannel film disc player again, CPU controls the DVD working method of DSP module 406, multi-channel d/a converter 407 simultaneously according to the compression PCM format identification semaphore lock passage 402 that receiver 405 transmits, and plays the switching effect.
The digit signal receiver 405 that present embodiment adopts is CS8415A of U.S. CRYSTAL company.
Claims (8)
1, a kind of method that is used for the automatic selecting signal source of AV amplifier may further comprise the steps:
The first step: initialization, i=0;
Second step: the input channel of all signal sources of continuous sweep;
The 3rd step: each signal source passage is sampled, be converted to input microprocessor CPU after the digital signal;
The 4th step: CPU calculates sampled value;
The 5th step:, judge that certain road signalling channel has no signal output according to the result of calculation of the 4th step; If equal no signal output of each signalling channel and i=0 then return second step; If the 7th step is then carried out in equal no signal output of each signalling channel and i＞0; If certain paths has signal output, then i=i+1 carries out the 6th step;
The 6th step: this signal source of CPU control locking, and start main power source;
The 7th step: scanning other signal source passage except that the signal source of locked mistake once, return third step.
2, the method in automatic selecting signal as claimed in claim 1 source, it is characterized in that: described CPU to the calculating and the determination methods of sampled value is: the sampled value to every n time averages, and more adjacent two mean values, if the difference of two mean values is greater than a certain empirical value, then CPU judges the signal data stream input; N is a natural number.
3, the method in automatic selecting signal as claimed in claim 2 source, it is characterized in that: described threshold value is 30.
4, the method in automatic selecting signal as claimed in claim 1 source, it is characterized in that: described CPU to the calculating and the determination methods of sampled value is: the sampled value to every n time averages, if m mean value is all greater than a certain empirical value continuously, then CPU judges the signal data stream input, and n, m are natural number.
5, the method in automatic selecting signal as claimed in claim 4 source, it is characterized in that: described threshold value is 50.
6, a kind of automatic selector of signal source that is used for the AV amplifier comprises:
A plurality of signal sources (CD, VCD, LD, DVD, TAPE), wherein each is all in order to produce a kind of simulation letter
Number;
First electronic switch (SW101) links to each other with described a plurality of signal sources, carries out continuous sweep in order to the input channel to described a plurality of signal sources;
Analog to digital converter (A/D) is sampled in order to each signal source to described first electronic switch (SW101) scanning, be converted to digital signal after input microprocessor CPU carry out analyzing and processing;
Second electronic switch (SW102) also links to each other with described a plurality of signal sources, to some locking the in described a plurality of signal sources, audio/video signal is imported post processing electric circuit, and amplifies output;
Microprocessor CPU calculates the sampled value of analog to digital converter output, according to the analysis result of sampled value being controlled described first electronic switch (SW101), second electronic switch (SW102).
7, a kind of method that is used for the automatic selecting signal source of AV amplifier may further comprise the steps:
The first step: the input signal in received signal source;
Second step: produce the format identification signal according to received signal, and send into microprocessor;
The 3rd step: microprocessor is according to locking reception, Digital Signal Processing, the digital-to-analogue conversion of different format identification signal controlling digital signals.
8, a kind of automatic selector of signal source that is used for the AV amplifier comprises:
A plurality of signal sources (401,402,403,404), wherein each is all in order to produce a kind of digital signal;
Digit signal receiver (405), in order to receive the digital signal of described signal source (401,402,403,404), and the format identification signal that produces corresponding format sends into microprocessor CPU and digital signal processing module (406), and accepts the control of microprocessor;
Digital signal processing module (406) is handled in order to the signal that described digit signal receiver (405) is transmitted, and accepts the control of microprocessor;
Multi-channel digital and analogue transducer (407) converts analog signal in order to the digital signal that described digital signal processing module (406) is transmitted, and accepts the control of microprocessor;
Microprocessor in order to receiving the format identification signal of the corresponding format that described digit signal receiver (405) transmits, and is controlled described digit signal receiver (405), digital signal processing module (406), multi-channel digital and analogue transducer (407).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114109 CN1270449A (en) | 2000-03-13 | 2000-03-13 | Method and device for automatically selecting signal source of audio and video amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114109 CN1270449A (en) | 2000-03-13 | 2000-03-13 | Method and device for automatically selecting signal source of audio and video amplifier |
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| CN1270449A true CN1270449A (en) | 2000-10-18 |
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| CN 00114109 Pending CN1270449A (en) | 2000-03-13 | 2000-03-13 | Method and device for automatically selecting signal source of audio and video amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958691A (en) * | 2008-10-31 | 2011-01-26 | 成都芯源系统有限公司 | Class D audio amplifier and method |
| CN103529379A (en) * | 2013-07-04 | 2014-01-22 | 东南大学 | Selection method used for low-resolution signal source in high-precision ADC test |
| CN108206035A (en) * | 2016-12-20 | 2018-06-26 | 通号通信信息集团上海有限公司 | A kind of embedded recording and playing device and method for carrying out channel selecting |
-
2000
- 2000-03-13 CN CN 00114109 patent/CN1270449A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958691A (en) * | 2008-10-31 | 2011-01-26 | 成都芯源系统有限公司 | Class D audio amplifier and method |
| CN101958691B (en) * | 2008-10-31 | 2013-06-05 | 成都芯源系统有限公司 | Class D audio amplifier and method |
| CN103529379A (en) * | 2013-07-04 | 2014-01-22 | 东南大学 | Selection method used for low-resolution signal source in high-precision ADC test |
| CN103529379B (en) * | 2013-07-04 | 2016-01-20 | 东南大学 | For the choosing method in low-resolution signal source in high-precision adc test |
| CN108206035A (en) * | 2016-12-20 | 2018-06-26 | 通号通信信息集团上海有限公司 | A kind of embedded recording and playing device and method for carrying out channel selecting |
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