JPS57172511A - Time-axis compressing and expanding circuit - Google Patents

Time-axis compressing and expanding circuit

Info

Publication number
JPS57172511A
JPS57172511A JP56058821A JP5882181A JPS57172511A JP S57172511 A JPS57172511 A JP S57172511A JP 56058821 A JP56058821 A JP 56058821A JP 5882181 A JP5882181 A JP 5882181A JP S57172511 A JPS57172511 A JP S57172511A
Authority
JP
Japan
Prior art keywords
pass filter
low
signal
variable
variable low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56058821A
Other languages
Japanese (ja)
Other versions
JPH035597B2 (en
Inventor
Takehiko Asano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP56058821A priority Critical patent/JPS57172511A/en
Publication of JPS57172511A publication Critical patent/JPS57172511A/en
Publication of JPH035597B2 publication Critical patent/JPH035597B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00007—Time or data compression or expansion

Abstract

PURPOSE:To reduce the influence of higher harmonic noise due to the discontinuance of a waveform by providing a variable low-pass filter whose cutoff frequency is controlled by a control signal based upon the processing arithmetic result of a sound piece connection part by an arithmetic processing means. CONSTITUTION:A playback signal reproduced at a different speed from that in recording is equalized by a reproducing equalizer 2 and amplified, and the amplified signal is written in, for example, four BBDs 3-6 and read successively to be outputted through the switching of analog switches 7-10, so that reproduction is carried out through a variable low-pass filter 19. On the other hand, the output of the reproducing equalizer 2 is applied to a variable and-pass dividing filter 20, and levels of a low and a high frequency part are detected by sensors 21 and 22. Both the levels are compared mutually by a level comparator 23; when the level of the low frequency component is higher, a variable low-pass filter 19 operates to cut higher harmonics of the discontinuous part of a signal, and when not, the variable low-pass filter is turned off to mask higher harmonic noise with the signal of the high frequency component.
JP56058821A 1981-04-17 1981-04-17 Time-axis compressing and expanding circuit Granted JPS57172511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058821A JPS57172511A (en) 1981-04-17 1981-04-17 Time-axis compressing and expanding circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058821A JPS57172511A (en) 1981-04-17 1981-04-17 Time-axis compressing and expanding circuit

Publications (2)

Publication Number Publication Date
JPS57172511A true JPS57172511A (en) 1982-10-23
JPH035597B2 JPH035597B2 (en) 1991-01-25

Family

ID=13095290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058821A Granted JPS57172511A (en) 1981-04-17 1981-04-17 Time-axis compressing and expanding circuit

Country Status (1)

Country Link
JP (1) JPS57172511A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139588A (en) * 1985-12-13 1987-06-23 カシオ計算機株式会社 Sampling electronic musical apparatus
JPH076506A (en) * 1993-06-11 1995-01-10 Nec Corp Pcm sound recording/reproducing device
US5764428A (en) * 1992-04-08 1998-06-09 Sony Corporation Audio signal reproducing apparatus
JP2004527000A (en) * 2001-04-13 2004-09-02 ドルビー・ラボラトリーズ・ライセンシング・コーポレーション High quality time scaling and pitch scaling of audio signals

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52134303A (en) * 1976-05-06 1977-11-10 Tadamutsu Hirata Device for processing audio pitch correcting signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52134303A (en) * 1976-05-06 1977-11-10 Tadamutsu Hirata Device for processing audio pitch correcting signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139588A (en) * 1985-12-13 1987-06-23 カシオ計算機株式会社 Sampling electronic musical apparatus
US5764428A (en) * 1992-04-08 1998-06-09 Sony Corporation Audio signal reproducing apparatus
JPH076506A (en) * 1993-06-11 1995-01-10 Nec Corp Pcm sound recording/reproducing device
JP2004527000A (en) * 2001-04-13 2004-09-02 ドルビー・ラボラトリーズ・ライセンシング・コーポレーション High quality time scaling and pitch scaling of audio signals

Also Published As

Publication number Publication date
JPH035597B2 (en) 1991-01-25

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