JPS5548811A - Compressing and expanding unit for time axis of audio - Google Patents
Compressing and expanding unit for time axis of audioInfo
- 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
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
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)
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 |
-
1978
- 1978-10-02 JP JP12130178A patent/JPS5548811A/en active Pending
Cited By (2)
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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