JPS5548811A - Compressing and expanding unit for time axis of audio - Google Patents

Compressing and expanding unit for time axis of audio

Info

Publication number
JPS5548811A
JPS5548811A JP12130178A JP12130178A JPS5548811A JP S5548811 A JPS5548811 A JP S5548811A JP 12130178 A JP12130178 A JP 12130178A JP 12130178 A JP12130178 A JP 12130178A JP S5548811 A JPS5548811 A JP S5548811A
Authority
JP
Japan
Prior art keywords
signal
write
pulse
companding
readout
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.)
Pending
Application number
JP12130178A
Other languages
Japanese (ja)
Inventor
Yorimoto Tanno
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP12130178A priority Critical patent/JPS5548811A/en
Priority to DE19792939962 priority patent/DE2939962A1/en
Publication of JPS5548811A publication Critical patent/JPS5548811A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE: To enable the compressing and expanding of time axis simply, by write- in and readout of audio signal digitized with the pulse having different period.
CONSTITUTION: When the companding selection circuit 17 sets the companding ratio, the reproducing signal changed in the tape speed is fed to the constant difference modulator 4, and it is DA-converted in the timing of EPS with the coded pulse of the pulse generator 10 variable in the period and written in RAM's 5 and 6 alternately. In the two RAM's, the read write signal RW and inversion RW from the control circuit 14 repeat the write-in mode and readout mode respectively and the write-in and readout speed are controlled with the address pulses APSA(H) and APSB(I) from the circuit 14. The data read out is fed to the DA converter 8 alternately via the gate 7 and it is analog signal and outputted in the period of the decoding pulse DPS of the pulse generator 13. Thus, the companding signal having unchanged signal as the original signal can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP12130178A 1978-10-02 1978-10-02 Compressing and expanding unit for time axis of audio Pending JPS5548811A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12130178A JPS5548811A (en) 1978-10-02 1978-10-02 Compressing and expanding unit for time axis of audio
DE19792939962 DE2939962A1 (en) 1978-10-02 1979-10-02 Time compression expansion of tape recorded speech - using variable ratios selected by operator and avoiding speech distortion by accurate matching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12130178A JPS5548811A (en) 1978-10-02 1978-10-02 Compressing and expanding unit for time axis of audio

Publications (1)

Publication Number Publication Date
JPS5548811A true JPS5548811A (en) 1980-04-08

Family

ID=14807860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12130178A Pending JPS5548811A (en) 1978-10-02 1978-10-02 Compressing and expanding unit for time axis of audio

Country Status (1)

Country Link
JP (1) JPS5548811A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214400A (en) * 1984-04-11 1985-10-26 日本ビクター株式会社 Pitch varying apparatus for voice signal
JP2007168795A (en) * 2005-11-22 2007-07-05 Kao Corp Container containing powdered detergent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214400A (en) * 1984-04-11 1985-10-26 日本ビクター株式会社 Pitch varying apparatus for voice signal
JP2007168795A (en) * 2005-11-22 2007-07-05 Kao Corp Container containing powdered detergent

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