JPS56146313A - Compressing and expanding system of digital modulated wave - Google Patents

Compressing and expanding system of digital modulated wave

Info

Publication number
JPS56146313A
JPS56146313A JP5008180A JP5008180A JPS56146313A JP S56146313 A JPS56146313 A JP S56146313A JP 5008180 A JP5008180 A JP 5008180A JP 5008180 A JP5008180 A JP 5008180A JP S56146313 A JPS56146313 A JP S56146313A
Authority
JP
Japan
Prior art keywords
level
supplied
modulated wave
digital modulated
signal
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.)
Granted
Application number
JP5008180A
Other languages
Japanese (ja)
Other versions
JPS6313576B2 (en
Inventor
Masao Kasuga
Norio Hiyama
Yoshiyuki Tsuchikane
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 JP5008180A priority Critical patent/JPS56146313A/en
Priority to NLAANVRAGE8006810,A priority patent/NL190093C/en
Priority to GB8040416A priority patent/GB2070361B/en
Priority to DE3047447A priority patent/DE3047447C2/en
Priority to US06/217,949 priority patent/US4355304A/en
Publication of JPS56146313A publication Critical patent/JPS56146313A/en
Publication of JPS6313576B2 publication Critical patent/JPS6313576B2/ja
Granted 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

Abstract

PURPOSE:To realize a transmission with a small number of bits, by transmitting an analog conversion value of the digital modulated wave at the transmitter side after a level compression and then giving a level expansion to the above-mentioned conversion value of digital modulated wave transmitted to the receiver side by an amount equivalent to the level compression. CONSTITUTION:The analog signal sent from the input terminal 1 is supplied to the sampling/ holding circuit 3 through the low-pass filter 2, and the sampling signal is supplied to the A/D converter 8. Then the digital modulated wave of the converter 8 is supplied to a variable gain unit 13 and then transmitted after the analog conversion level receives a abbreviated variation by the control signal supplied from the gain control part 14 as well as to the signal predicting circuit 15 within the control part 14. The circuit 15 predicts the level of the signal to be supplied at the next time based on the present level and the 1-sample preceding level. The digital modulated wave received at the receiver side is supplied to the variable gain unit 18 and the gain control part 19, and the analog conversion level of the unit 18 receives a variable control by the output of the control part 19 to have an expanding action. Then the original analog signal is delivered through the D/A converter 9 and low-pass filter 11.
JP5008180A 1979-12-17 1980-04-15 Compressing and expanding system of digital modulated wave Granted JPS56146313A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5008180A JPS56146313A (en) 1980-04-15 1980-04-15 Compressing and expanding system of digital modulated wave
NLAANVRAGE8006810,A NL190093C (en) 1979-12-17 1980-12-16 COMPRESSING AND EXPANDING SYSTEM.
GB8040416A GB2070361B (en) 1979-12-17 1980-12-17 Gain control
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
US06/217,949 US4355304A (en) 1979-12-17 1980-12-18 Digital compandor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5008180A JPS56146313A (en) 1980-04-15 1980-04-15 Compressing and expanding system of digital modulated wave

Publications (2)

Publication Number Publication Date
JPS56146313A true JPS56146313A (en) 1981-11-13
JPS6313576B2 JPS6313576B2 (en) 1988-03-26

Family

ID=12849057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5008180A Granted JPS56146313A (en) 1979-12-17 1980-04-15 Compressing and expanding system of digital modulated wave

Country Status (1)

Country Link
JP (1) JPS56146313A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169227A (en) * 1984-02-10 1985-09-02 Fuji Facom Corp Automatic range switching analog-digital converter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4921056A (en) * 1972-04-19 1974-02-25
JPS54124663A (en) * 1978-03-20 1979-09-27 Nippon Telegr & Teleph Corp <Ntt> Pcm modulation/demodulation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4921056A (en) * 1972-04-19 1974-02-25
JPS54124663A (en) * 1978-03-20 1979-09-27 Nippon Telegr & Teleph Corp <Ntt> Pcm modulation/demodulation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169227A (en) * 1984-02-10 1985-09-02 Fuji Facom Corp Automatic range switching analog-digital converter
JPH0542176B2 (en) * 1984-02-10 1993-06-25 Fuji Facom Corp

Also Published As

Publication number Publication date
JPS6313576B2 (en) 1988-03-26

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