JPS5567231A - Digital compressor - Google Patents

Digital compressor

Info

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
Application number
JP14033478A
Other languages
Japanese (ja)
Inventor
Akira Fukui
Yasumasa Iwase
Tatsuro Miyoshi
Takao Kato
Takaaki Osaki
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.)
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Nippon Electric Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP14033478A priority Critical patent/JPS5567231A/en
Publication of JPS5567231A publication Critical patent/JPS5567231A/en
Pending legal-status Critical Current

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
JP14033478A 1978-11-14 1978-11-14 Digital compressor Pending JPS5567231A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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