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JPS5698951A - Compression and expansion device for digital modulation wave - Google Patents

Compression and expansion device for digital modulation wave

Info

Publication number
JPS5698951A
JPS5698951A JP115080A JP115080A JPS5698951A JP S5698951 A JPS5698951 A JP S5698951A JP 115080 A JP115080 A JP 115080A JP 115080 A JP115080 A JP 115080A JP S5698951 A JPS5698951 A JP S5698951A
Authority
JP
Japan
Prior art keywords
circuit
output
signal
modulation wave
fed
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
JP115080A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Tsuchikane
Masao Kasuga
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP115080A priority Critical patent/JPS5698951A/en
Priority to NLAANVRAGE8006810,A priority patent/NL190093C/en
Priority to DE3047447A priority patent/DE3047447C2/en
Priority to GB8040416A priority patent/GB2070361B/en
Priority to US06/217,949 priority patent/US4355304A/en
Publication of JPS5698951A publication Critical patent/JPS5698951A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals

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)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To enable to transmit digital modulation wave efficiently by obtaining the predicted signal showing the prediction value of digital signal output from the absolute value circuit after one sampling interval from the output at present time of the absolute value circuit. CONSTITUTION:The digital modulation wave in n-bit per one sampling incoming to the terminal 7, is stored in the shift register 8 and fed to the absolute value circuit 9 for the absolute value. The output of this circuit 9 is delayed by one sampling interval or more at the delay register circuit 10, then it is fed to the adder 12 and added with the signal at present time from the circuit 9. Thus, the output signal of the circuit 12 is fed to the multiplier 13 as the difference signal and it is multiplied with the weighting coefficient from the coefficient device 14. Further, the output from the multiplier 13 is fed to the adder 15, and it is added with the output of the circuit 9 to obtain the prediction signal representing the prediction value of digital signal outputted from the circuit 9 after one sampling interval from the output at present time from the circuit 9. Thus, the transmission of digital modulation wave can be made efficiently.
JP115080A 1979-12-17 1980-01-09 Compression and expansion device for digital modulation wave Pending JPS5698951A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP115080A JPS5698951A (en) 1980-01-09 1980-01-09 Compression and expansion device for digital modulation wave
NLAANVRAGE8006810,A NL190093C (en) 1979-12-17 1980-12-16 COMPRESSING AND EXPANDING SYSTEM.
DE3047447A DE3047447C2 (en) 1979-12-17 1980-12-17 Digital amplifier for expanding or narrowing the dynamic range of a digital input signal sent to the amplifier as required
GB8040416A GB2070361B (en) 1979-12-17 1980-12-17 Gain control
US06/217,949 US4355304A (en) 1979-12-17 1980-12-18 Digital compandor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP115080A JPS5698951A (en) 1980-01-09 1980-01-09 Compression and expansion device for digital modulation wave

Publications (1)

Publication Number Publication Date
JPS5698951A true JPS5698951A (en) 1981-08-08

Family

ID=11493403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP115080A Pending JPS5698951A (en) 1979-12-17 1980-01-09 Compression and expansion device for digital modulation wave

Country Status (1)

Country Link
JP (1) JPS5698951A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313119A1 (en) * 1983-04-12 1984-10-18 Siemens AG, 1000 Berlin und 8000 München Method for digital sound transmission
JPH07170198A (en) * 1994-12-05 1995-07-04 Oki Electric Ind Co Ltd Linear-nonlinear code conversion method and conversion circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313119A1 (en) * 1983-04-12 1984-10-18 Siemens AG, 1000 Berlin und 8000 München Method for digital sound transmission
JPH07170198A (en) * 1994-12-05 1995-07-04 Oki Electric Ind Co Ltd Linear-nonlinear code conversion method and conversion circuit
JP2538769B2 (en) * 1994-12-05 1996-10-02 沖電気工業株式会社 Linear-nonlinear code conversion method and conversion circuit

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