JPS57168521A - Coder - Google Patents

Coder

Info

Publication number
JPS57168521A
JPS57168521A JP5311181A JP5311181A JPS57168521A JP S57168521 A JPS57168521 A JP S57168521A JP 5311181 A JP5311181 A JP 5311181A JP 5311181 A JP5311181 A JP 5311181A JP S57168521 A JPS57168521 A JP S57168521A
Authority
JP
Japan
Prior art keywords
output
held
input
integrator
coder
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
JP5311181A
Other languages
Japanese (ja)
Inventor
Kaoru Yano
Koji Yoshimoto
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 JP5311181A priority Critical patent/JPS57168521A/en
Publication of JPS57168521A publication Critical patent/JPS57168521A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To obtain the stable characteristics in both the voiceless and voiced modes of an input analog signal, by adding a drift compensating circuit of a simple constitution to a feedback type coder to form a midtread type coder. CONSTITUTION:The input analog signal supplied to an input terminal 14 is sampled and held a sampling and holding circuit 1. This held voltage is supplied to an addition amplifier 2 and then led out through an output terminal 15 in the form of a PCM output. In case when a sequential feedback type coding circuit is turned into a bipolar coder of 4-bits, a positive side switch 12 is driven by a positive side detector 8 when the quantizing level of the PCM output emerging at the output of an FF6 is positioned at +2-+8. Thus the voltage held at an integrator 7 is discharged. When the quantizing level is set at -1--8, a negative side switch 13 is driven by a negative side detector 9 to charge the voltage held at the integrator 7. The output of the integrator 7 is applied to the input of the amplifier 2 to give a compensating control to the amplifier 2. As a result, the noise characteristics are obtained in good condition for the reproduced signal in the voiceless input mode.
JP5311181A 1981-04-10 1981-04-10 Coder Pending JPS57168521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5311181A JPS57168521A (en) 1981-04-10 1981-04-10 Coder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5311181A JPS57168521A (en) 1981-04-10 1981-04-10 Coder

Publications (1)

Publication Number Publication Date
JPS57168521A true JPS57168521A (en) 1982-10-16

Family

ID=12933679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5311181A Pending JPS57168521A (en) 1981-04-10 1981-04-10 Coder

Country Status (1)

Country Link
JP (1) JPS57168521A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59183525A (en) * 1983-04-01 1984-10-18 Fujitsu Ltd Analog-digital converting circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55143855A (en) * 1979-04-25 1980-11-10 Fujitsu Ltd Offset compensating circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55143855A (en) * 1979-04-25 1980-11-10 Fujitsu Ltd Offset compensating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59183525A (en) * 1983-04-01 1984-10-18 Fujitsu Ltd Analog-digital converting circuit

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