JPS5548813A - Compressing and expanding unit for time axis of audio - Google Patents
Compressing and expanding unit for time axis of audioInfo
- Publication number
- JPS5548813A JPS5548813A JP12130378A JP12130378A JPS5548813A JP S5548813 A JPS5548813 A JP S5548813A JP 12130378 A JP12130378 A JP 12130378A JP 12130378 A JP12130378 A JP 12130378A JP S5548813 A JPS5548813 A JP S5548813A
- Authority
- JP
- Japan
- Prior art keywords
- write
- signal
- readout
- pulse
- time axis
- 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 compression and expansion of time axis simply, by write- in and readout of audio signal digitized with the pulses different each other.
CONSTITUTION: The reproducing output changed in the tape speed is fed to the AD converter 4 and it is converted in the period of the pulse EPS of the pulse generator 13 of variable frequency, and it is alternately written in the RAM's 5 and 6. The read write signal RM and inversion RW from the control circuit 12 in the two RAM's repeate complementarily the write-in mode and readout mode, and the write-in and readout speed are controlled with the address pulses APSA and APSB from the circuit 12 at the same time. The data read out is alternately fed to the DA converter 8 via the gate 7, it is converted in the period of the decoded pulse DPS of the pulse generator 16 in a fixed frequency and analog signal is outputted. Thus, the companding signal having unchanged frequency as the original signal can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12130378A JPS5548813A (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 |
---|---|---|---|
JP12130378A JPS5548813A (en) | 1978-10-02 | 1978-10-02 | Compressing and expanding unit for time axis of audio |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5548813A true JPS5548813A (en) | 1980-04-08 |
Family
ID=14807909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12130378A Pending JPS5548813A (en) | 1978-10-02 | 1978-10-02 | Compressing and expanding unit for time axis of audio |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5548813A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105809A (en) * | 1980-12-24 | 1982-07-01 | Hitachi Ltd | Recording and reproducing device |
JPS57138699A (en) * | 1981-02-20 | 1982-08-27 | Sanyo Electric Co | Voice synthesizer |
JPS57211841A (en) * | 1981-06-23 | 1982-12-25 | Fujitsu Ltd | Communication system for compression of voice information time |
JPS61121539A (en) * | 1984-11-16 | 1986-06-09 | Nec Corp | Sound signal reproducing circuit |
JPS61125235A (en) * | 1984-11-21 | 1986-06-12 | Yaesu Musen Co Ltd | Band compression system |
-
1978
- 1978-10-02 JP JP12130378A patent/JPS5548813A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105809A (en) * | 1980-12-24 | 1982-07-01 | Hitachi Ltd | Recording and reproducing device |
JPH0223877B2 (en) * | 1980-12-24 | 1990-05-25 | Hitachi Ltd | |
JPS57138699A (en) * | 1981-02-20 | 1982-08-27 | Sanyo Electric Co | Voice synthesizer |
JPH035599B2 (en) * | 1981-02-20 | 1991-01-25 | Sanyo Electric Co | |
JPS57211841A (en) * | 1981-06-23 | 1982-12-25 | Fujitsu Ltd | Communication system for compression of voice information time |
JPH0324820B2 (en) * | 1981-06-23 | 1991-04-04 | Fujitsu Ltd | |
JPS61121539A (en) * | 1984-11-16 | 1986-06-09 | Nec Corp | Sound signal reproducing circuit |
JPS61125235A (en) * | 1984-11-21 | 1986-06-12 | Yaesu Musen Co Ltd | Band compression system |
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