JPS5567231A - Digital compressor - Google Patents
Digital compressorInfo
- Publication number
- JPS5567231A JPS5567231A JP14033478A JP14033478A JPS5567231A JP S5567231 A JPS5567231 A JP S5567231A JP 14033478 A JP14033478 A JP 14033478A JP 14033478 A JP14033478 A JP 14033478A JP S5567231 A JPS5567231 A JP S5567231A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- appears
- bit
- register
- 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
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
PURPOSE: To obtain logarithmic compressed PCM signals approximaring a polygonal line from linear PCM signals by a simple constitution and timing.
CONSTITUTION: Absolute value Y of input expanded signal 10 is taken into absolute value circuit 1, and this value and 25 are added by 2 to make intermediate processing signal 14 as shown in expression (1) (however, L is the polygonal line number and M is an internal small step number of the polygonal line), and this signal 14 is supplied to shift register 3. Meanwhile, register 5 uses first output Q0 of register 3, namely, bit 16 of signal 14 as a control signal to latch the output of counter 4 and second to fifth outputs Q1∼Q4 of register 3 if bit 16 is "1". When bit 16 is changed from the upper bit to the lower bit of signal 14, 2L+4∼2L+4, namely, number M appears at outputs Q1∼Q4 when 2L+5 appears at output Q0, and the output of counter 4 is reset when 25 of signal 14 appears at output Q0, and number L appears at the output of counter 4 when 2L+5 of signal 14 appears at output Q0. Consequently, desired compressed signal W (expression 2) can be obtained by extracting numbers L and M from signal 14.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14033478A JPS5567231A (en) | 1978-11-14 | 1978-11-14 | Digital compressor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14033478A JPS5567231A (en) | 1978-11-14 | 1978-11-14 | Digital compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5567231A true JPS5567231A (en) | 1980-05-21 |
Family
ID=15266400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14033478A Pending JPS5567231A (en) | 1978-11-14 | 1978-11-14 | Digital compressor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5567231A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05276046A (en) * | 1991-10-03 | 1993-10-22 | Internatl Business Mach Corp <Ibm> | Device for grading sound signal and method therefor |
-
1978
- 1978-11-14 JP JP14033478A patent/JPS5567231A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05276046A (en) * | 1991-10-03 | 1993-10-22 | Internatl Business Mach Corp <Ibm> | Device for grading sound signal and method therefor |
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