CN1082237A - High-fidelity slow reproducing technique for recorded audio signals - Google Patents
High-fidelity slow reproducing technique for recorded audio signals Download PDFInfo
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- CN1082237A CN1082237A CN 93117315 CN93117315A CN1082237A CN 1082237 A CN1082237 A CN 1082237A CN 93117315 CN93117315 CN 93117315 CN 93117315 A CN93117315 A CN 93117315A CN 1082237 A CN1082237 A CN 1082237A
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- frequency
- circuit
- audio signals
- recorded audio
- fidelity
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Abstract
The present invention is a kind of high-fidelity slow reproducing technique for recorded audio signals that is used for Audio Processing.It adopts circuit such as input, balanced amplification, fidelity processing, low frequency amplification, power amplification and power supply adjustment, and the fidelity treatment circuit is made up of broadband frequency multiplier circuit, isostatic correction circuit, gain correction circuit, power supply regulator circuit and switching device; The broadband frequency multiplier circuit comprises modulator, CF signal generator, frequency band frequency multiplier, band amplifier and detuner.It utilizes frequency reducing signal modulated carriers signal, and modulated signal is carried out two frequencys multiplication, realizes the broadband frequency multiplication, reaches the purpose of high-fidelity slow reproducing.The present invention has the reliable and high advantage of fidelity of method.
Description
The present invention relates to a kind of audio-frequency processing method, particularly a kind of high-fidelity slow reproducing technique for recorded audio signals.
Recorded audio signals playback system of the prior art all adopts constant belt speed playback, and its incompatibility learns a foreign language, remembers the needs that music score and arrangement recording are talked; If adopt speed change playback, particularly playback at a slow speed, its tone and volume change, and distorted signals is big.
The objective of the invention is to provide a kind of high-fidelity slow reproducing technique for recorded audio signals, and it can enlarge the cassette player usable range effectively, improves reliably and puts fidelity slowly, improves the playback reductibility of tone and volume up hill and dale.
The object of the present invention is achieved like this: technology of the present invention adopts input circuit, balanced amplifying circuit, fidelity treatment circuit, low-frequency amplifier circuit, power amplification circuit and power supply regulator circuit; Wherein, the fidelity treatment circuit is made up of broadband frequency multiplier circuit, isostatic correction circuit, gain correction circuit, power supply regulator circuit and switching device; And the broadband frequency multiplier circuit is made up of modulator, CF signal generator, frequency band frequency multiplier, band amplifier and detuner; When adopting the amplitude modulation mode to handle recorded audio signals, modulator adopts the amplitude modulation modulator, and detuner adopts aural detector, and perhaps when adopting mode of frequency regulation to handle recorded audio signals, modulator adopts frequency modulator, and detuner adopts frequency discriminator.Simultaneously, balanced amplifying circuit is connected with the frequency correction network, handles in order to the isostatic correction that realizes recorded audio signals; Be provided with attenuation network behind the balanced amplifying circuit, handle in order to the gain calibration that realizes recorded audio signals; Modulator is connected with the CF signal generator with attenuation network, in modulator, is 232.5kH from the frequency of CF signal generator
zCF signal be subjected to modulation from the frequency reducing signal of attenuation network, produce modulated signal; Set gradually the frequency band frequency multiplier behind the modulator, band amplifier and detuner, producing centre frequency in the frequency band frequency multiplier is 465kH
z, the modulated signal that doubles of frequency span, this signal is sent into detuner after band amplifier is handled, thereby obtain recorded audio signals, this recorded audio signals is handled through low-frequency amplifier and power amplifier, it is identical with original signal with volume to promote loudspeaker generation tone at last, and the recorded audio signals of speed doppio lunghezza di tempo.
The present invention is because adopted modulator and frequency band frequency multiplier in the broadband frequency multiplier circuit, it can realize two frequencys multiplication of modulated signal; Simultaneously owing in the broadband frequency multiplier circuit, being provided with band amplifier and detuner, so can obtain the audible spectrum identical with normal playback; In addition because modulator can be amplitude modulation modulator or frequency interleaved modulation modulator, and detuner can correspondingly be provided with aural detector or frequency discriminator, so can adopt amplitude modulation mode or mode of frequency regulation to realize the high-fidelity slow reproducing of recorded audio signals; The present invention has also that method is reliable, tone and volume is Well-recovered and fidelity is high advantage.
Concrete grammar of the present invention is illustrated by following embodiment and accompanying drawing thereof.
Fig. 1 is the recorded audio signals high-fidelity slow reproducing circuit system theory diagram that proposes according to concrete grammar of the present invention;
Fig. 2 be recorded audio signals normal playback frequency spectrum, recorded audio signals put slowly-modulate-frequency multiplication frequency spectrum and detection after Spectrum Relationship figure.
The circuit theory of technical method of the present invention is: the journey of letting slip slowly in employing amplitude modulation mode is an example, and during the recorded audio signals normal playback, the frequency spectrum of voice signal is at 20-20000H
zScope, after belt speed reduced by one times, each radio-frequency component of signal that takes out from playback head also all reduced by one times, is 10-10000H
zIf this signal is directly amplified the back playback, will produce the serious frequency distortion.Because its relative working band is very wide, also is impossible so directly carry out the frequency multiplication of such broadband signal.In order to realize the broadband frequency multiplication, at first adopt frequency reducing signal modulating frequency f from attenuation network
01=232.5kH
zCF signal, produce modulated signal, then this modulated signal is carried out two letters frequently, obtain normal intermediate frequency modulated signal; Through centre frequency f
02=465kH
zIntermediate frequency amplify and detection is handled, obtain the audible spectrum identical with the normal playback process, after low frequency and power amplification, realize fidelity playback at a slow speed again.
When adopting technical method of the present invention to carry out normal playback, K
oPlace " normally " gear, this moment, its playback process was identical with common belt speed playback.When carrying out high-fidelity slow reproducing, K
oPlace " putting slowly " gear, this moment frequency compensation corrective network, attenuation network, broadband frequency multiplier circuit and slow discharge source system place in circuit.Along with power source conversion, direct current motor makes belt speed reduce by one times.The frequency of taking out from playback head reduces by one times recorded audio signals, delivers to equalizer amplifier through input circuit, sends into low frequency broadband frequency multiplier circuit after the amplification again and carries out process of frequency multiplication.At this moment CF signal generator generation frequency is 232.5kH
zCF signal send into modulator, perhaps when adopting the amplitude modulation mode, this signal is sent into the amplitude modulation modulator, perhaps when adopting mode of frequency regulation, this signal is sent into frequency interleaved modulation modulator, the frequency reducing signal from equalizer amplifier also enters modulator simultaneously.In modulator, CF signal is subjected to the modulation of frequency reducing signal, and produces the double-side band modulated signal.This double-side band modulated signal is sent into the frequency band frequency multiplier, and producing centre frequency in the frequency band frequency multiplier is 465kH
z, and the modulated signal that frequency span doubles, like this its sideband just with reduction of speed before the recorded audio signals frequency band identical.This modulated signal is sent into detuner after band amplifier amplifies, perhaps when adopting the amplitude modulation mode, this amplifying signal is sent into aural detector, perhaps when adopting mode of frequency regulation, this amplifying signal is sent into frequency discriminator, obtains recorded audio signals.This recorded audio signals is handled through low-frequency amplifier and power amplifier, and it is all identical with original signal with volume to promote loudspeaker generation tone at last, and the recorded audio signals of speed doppio lunghezza di tempo.
Claims (2)
1, a kind of high-fidelity slow reproducing technique for recorded audio signals, this technology adopts input circuit, balanced amplifying circuit, fidelity treatment circuit, low-frequency amplifier circuit, power amplification circuit and power supply regulator circuit, it is characterized in that: the fidelity treatment circuit is made up of broadband frequency multiplier circuit, isostatic correction circuit, gain correction circuit, power supply regulator circuit and switching device, wherein, the broadband frequency multiplier circuit is made up of modulator, CF signal generator, frequency band frequency multiplier, band amplifier and detuner; When adopting the amplitude modulation mode to handle recorded audio signals, modulator adopts the amplitude modulation modulator, and detuner adopts aural detector, and perhaps when adopting mode of frequency regulation to handle recorded audio signals, modulator adopts frequency interleaved modulation modulator, and detuner adopts frequency discriminator.
2, high-fidelity slow reproducing technique for recorded audio signals according to claim 1 is characterized in that: balanced amplifying circuit is connected with the frequency compensation corrective network, handles in order to the isostatic correction that realizes recorded audio signals; Be provided with attenuation network behind the balanced amplifying circuit,, and avoid occurring ovennodulation in order to the gain calibration of realization recorded audio signals; Modulator is connected with the CF signal generator with attenuation network, in modulator, is that the CF signal of 232.5kHz is subjected to the modulation from the frequency reducing signal of attenuation network from the frequency of CF signal generator, produces modulated signal; Set gradually frequency band frequency multiplier, band amplifier and detuner behind the modulator, in the frequency band frequency multiplier, the generation centre frequency is the modulated signal that 465kHz, frequency span double, and this signal is sent into detuner after band amplifier is handled, thereby obtains recorded audio signals; This recorded audio signals is handled through low-frequency amplifier and power amplifier, and it is identical with original signal with volume to promote loudspeaker generation tone at last, and the recorded audio signals of speed doppio lunghezza di tempo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117315 CN1030234C (en) | 1993-09-07 | 1993-09-07 | High-fidelity slow reproducing technique for recorded audio signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117315 CN1030234C (en) | 1993-09-07 | 1993-09-07 | High-fidelity slow reproducing technique for recorded audio signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1082237A true CN1082237A (en) | 1994-02-16 |
| CN1030234C CN1030234C (en) | 1995-11-08 |
Family
ID=4991967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93117315 Expired - Fee Related CN1030234C (en) | 1993-09-07 | 1993-09-07 | High-fidelity slow reproducing technique for recorded audio signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030234C (en) |
-
1993
- 1993-09-07 CN CN 93117315 patent/CN1030234C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1030234C (en) | 1995-11-08 |
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