JPS579127A - Forecasting encoding device - Google Patents

Forecasting encoding device

Info

Publication number
JPS579127A
JPS579127A JP8336180A JP8336180A JPS579127A JP S579127 A JPS579127 A JP S579127A JP 8336180 A JP8336180 A JP 8336180A JP 8336180 A JP8336180 A JP 8336180A JP S579127 A JPS579127 A JP S579127A
Authority
JP
Japan
Prior art keywords
signal
forecast
accuracy
local decoding
quantization
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
JP8336180A
Other languages
Japanese (ja)
Other versions
JPH0654874B2 (en
Inventor
Norio Suzuki
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 JP55083361A priority Critical patent/JPH0654874B2/en
Publication of JPS579127A publication Critical patent/JPS579127A/en
Publication of JPH0654874B2 publication Critical patent/JPH0654874B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

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

Abstract

PURPOSE:To simplify the constitution of device and to reduce the increase in quantized noise due to forecast encoding, by quantizing a forecast signal so that the accuracy of quantization is the same as that for an input signal. CONSTITUTION:An input signal inputted to a encoder input terminal 1 is converted into a digital signal at an A/D converter 2, and a forecast signal obtained through the input of a forecast error signal to a local decoding part 21 is taken for a difference with said digital signal at a subtractor 3, and it is inputted to a quantizer 4 for quantization. This quantized forecast error signal is applied to an adder 5 in the local decoding part 21, the forecast signal being the output of the local decoding part 21 and said error signal are added to be a local decoding signal and the forecast signal is obtained from a forecast device 8 with high accuracy. Then, in a quantizing circuit 22, the quantization with the same degree of accuracy as that the accuracy of output of the converter 2 is made and the forecast signal is applied to the subtractor 3. This forecast error signal is transmitted to the transmission line from an output terminal 11 via a code conversion circuit 10.
JP55083361A 1980-06-18 1980-06-18 Predictive coding device Expired - Lifetime JPH0654874B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55083361A JPH0654874B2 (en) 1980-06-18 1980-06-18 Predictive coding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55083361A JPH0654874B2 (en) 1980-06-18 1980-06-18 Predictive coding device

Publications (2)

Publication Number Publication Date
JPS579127A true JPS579127A (en) 1982-01-18
JPH0654874B2 JPH0654874B2 (en) 1994-07-20

Family

ID=13800283

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55083361A Expired - Lifetime JPH0654874B2 (en) 1980-06-18 1980-06-18 Predictive coding device

Country Status (1)

Country Link
JP (1) JPH0654874B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6328968A (en) * 1986-07-15 1988-02-06 松下電工株式会社 Apparatus for cutting ball of wool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792788B1 (en) * 1999-04-21 2001-07-13 Mitsubishi Electric France METHOD FOR BALANCING THE Eb / I RATIO IN A CDMA MULTIPLEXING SERVICE SYSTEM AND TELECOMMUNICATION SYSTEM USING THE SAME

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5157157A (en) * 1974-11-15 1976-05-19 Hitachi Ltd ad henkanhoshiki

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5157157A (en) * 1974-11-15 1976-05-19 Hitachi Ltd ad henkanhoshiki

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6328968A (en) * 1986-07-15 1988-02-06 松下電工株式会社 Apparatus for cutting ball of wool

Also Published As

Publication number Publication date
JPH0654874B2 (en) 1994-07-20

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