JPS54109412A - Compandor circuit for signals - Google Patents
Compandor circuit for signalsInfo
- Publication number
- JPS54109412A JPS54109412A JP1729378A JP1729378A JPS54109412A JP S54109412 A JPS54109412 A JP S54109412A JP 1729378 A JP1729378 A JP 1729378A JP 1729378 A JP1729378 A JP 1729378A JP S54109412 A JPS54109412 A JP S54109412A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- ratio
- compression
- compression ratio
- signals
- 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)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
PURPOSE: To make it possible to effect the reproduction in such an expansion ratio as is complementary with a suitably selected compression ratio thereby to prevent the deterioration of the S/N ratio by writing the information corresponding to compression and expansion ratios in a special recording track simultaneously with the recording operation.
CONSTITUTION: The recording signals Vi fed to a terminal 10 have their gain controlled by a variable gain amplifier circuit VCA 11 to be controlled in its gain by a level sensor circuit, which is composed of a logarithmic conversion circuit 12 and a variable gain amplifier 13. The gain of the variable gain amplifier circuit 13 determines the compression ratio upon the recording operation and is indicated in the form of a control voltage by a compression and expansion ratio adjusting circuit 14. This voltage is subjected to V-f conversion by an oscillatory circuit 15 so that it is recorded in the special recording track of a tape recorder 17. Upon the reproduction, the reproduced signals from the recorded signals are subjected to f-V conversion to detect the compression ratio upon the recording operation so that the gain of a VCA 18 is so determined that the expansion ratio during the reproduction may be complementary with the compression ratio. As a result, the original sounds can be reproduced in high fidelity no matter how the compression ratio is determined.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1729378A JPS54109412A (en) | 1978-02-15 | 1978-02-15 | Compandor circuit for signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1729378A JPS54109412A (en) | 1978-02-15 | 1978-02-15 | Compandor circuit for signals |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54109412A true JPS54109412A (en) | 1979-08-28 |
Family
ID=11939940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1729378A Pending JPS54109412A (en) | 1978-02-15 | 1978-02-15 | Compandor circuit for signals |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54109412A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5679508A (en) * | 1979-12-04 | 1981-06-30 | Sony Corp | Gain control circuit |
-
1978
- 1978-02-15 JP JP1729378A patent/JPS54109412A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5679508A (en) * | 1979-12-04 | 1981-06-30 | Sony Corp | Gain control circuit |
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