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JPS5627546A - Block compressing coder - Google Patents

Block compressing coder

Info

Publication number
JPS5627546A
JPS5627546A JP10340879A JP10340879A JPS5627546A JP S5627546 A JPS5627546 A JP S5627546A JP 10340879 A JP10340879 A JP 10340879A JP 10340879 A JP10340879 A JP 10340879A JP S5627546 A JPS5627546 A JP S5627546A
Authority
JP
Japan
Prior art keywords
circuit
block
coefficient
sampled
multiplier
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
JP10340879A
Other languages
Japanese (ja)
Inventor
Kazuo Ochiai
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP10340879A priority Critical patent/JPS5627546A/en
Publication of JPS5627546A publication Critical patent/JPS5627546A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H04B14/048—Non linear compression or expansion

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To improve an SN ratio by finding a subsegment that includes the largest sampled value of sampled values in one block of an input signal and by multiplying sampled values in the block by a coefficient that corresponds to it. CONSTITUTION:A PCM code from input terminal 101 is led to maximum-segment- number extracting circuit 107 as well as delay circuit 102 that remembers an input signal for one block of N samples. Circuit 107 sends a coefficient, which corresponds to a subsegment including the greatest sampled value, to multiplier 105. The output of circuit 102 is supplied to multiplier 105 by way of nonlinear/linear converting circuit 103 and shift circuit 104 and after it is multipled by the coefficient value from circuit 107, truncating circuit 106 truncates the high-order bits to send a new sampled value to the output terminal. This method improves the SN ratio and lessens variations due to the input level.
JP10340879A 1979-08-13 1979-08-13 Block compressing coder Pending JPS5627546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10340879A JPS5627546A (en) 1979-08-13 1979-08-13 Block compressing coder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10340879A JPS5627546A (en) 1979-08-13 1979-08-13 Block compressing coder

Publications (1)

Publication Number Publication Date
JPS5627546A true JPS5627546A (en) 1981-03-17

Family

ID=14353217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10340879A Pending JPS5627546A (en) 1979-08-13 1979-08-13 Block compressing coder

Country Status (1)

Country Link
JP (1) JPS5627546A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723344A (en) * 1980-07-16 1982-02-06 Pioneer Electronic Corp Audio signal compressing and encoding methods
JPS5939134A (en) * 1982-08-30 1984-03-03 Hitachi Ltd Polygonal line extending circuit
JPS5939135A (en) * 1982-08-30 1984-03-03 Sansui Electric Co Signal transmitting system
JPS59228436A (en) * 1983-06-09 1984-12-21 Matsushita Electric Ind Co Ltd Digital expansion decoding circuit
JPS60178716A (en) * 1983-09-19 1985-09-12 アルカテル・エヌ・ブイ Pulse code modulation converter
JPS62207027A (en) * 1986-03-07 1987-09-11 Sony Corp Compression digitizing circuit for sound signal
JPS6314524A (en) * 1986-07-07 1988-01-21 Ricoh Co Ltd Voice coding system
JPS6314523A (en) * 1986-07-07 1988-01-21 Ricoh Co Ltd Voice coding system
JPS6323426A (en) * 1986-07-16 1988-01-30 Ricoh Co Ltd Sound coding system
JPH04297143A (en) * 1990-12-27 1992-10-21 Kenwood Corp Syllable compressor and expander

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723344A (en) * 1980-07-16 1982-02-06 Pioneer Electronic Corp Audio signal compressing and encoding methods
JPS6251534B2 (en) * 1980-07-16 1987-10-30 Pioneer Electronic Corp
JPS5939134A (en) * 1982-08-30 1984-03-03 Hitachi Ltd Polygonal line extending circuit
JPS5939135A (en) * 1982-08-30 1984-03-03 Sansui Electric Co Signal transmitting system
JPS59228436A (en) * 1983-06-09 1984-12-21 Matsushita Electric Ind Co Ltd Digital expansion decoding circuit
JPH0554294B2 (en) * 1983-06-09 1993-08-12 Matsushita Electric Ind Co Ltd
JPS60178716A (en) * 1983-09-19 1985-09-12 アルカテル・エヌ・ブイ Pulse code modulation converter
JPS62207027A (en) * 1986-03-07 1987-09-11 Sony Corp Compression digitizing circuit for sound signal
JPS6314524A (en) * 1986-07-07 1988-01-21 Ricoh Co Ltd Voice coding system
JPS6314523A (en) * 1986-07-07 1988-01-21 Ricoh Co Ltd Voice coding system
JPS6323426A (en) * 1986-07-16 1988-01-30 Ricoh Co Ltd Sound coding system
JPH04297143A (en) * 1990-12-27 1992-10-21 Kenwood Corp Syllable compressor and expander

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