JPS5714211A - Dynamic range varying circuit - Google Patents

Dynamic range varying circuit

Info

Publication number
JPS5714211A
JPS5714211A JP8882680A JP8882680A JPS5714211A JP S5714211 A JPS5714211 A JP S5714211A JP 8882680 A JP8882680 A JP 8882680A JP 8882680 A JP8882680 A JP 8882680A JP S5714211 A JPS5714211 A JP S5714211A
Authority
JP
Japan
Prior art keywords
output
dynamic range
inputted
codec
level
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
JP8882680A
Other languages
Japanese (ja)
Inventor
Eiji Kira
Kazuo Kitagawa
Kenjiro Endo
Isao Kobayashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8882680A priority Critical patent/JPS5714211A/en
Publication of JPS5714211A publication Critical patent/JPS5714211A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To achieve audio synthesis with high articulation by widening the dynamic range of a composite signal through an expander with nearly complementary characteristics for level compression accompained by frequency characteristics generated in a CODEC. CONSTITUTION:The output of a CODEC on a CVSD system is inputted to an output filter 51 to cut folded distortion, quantization noise, etc., and its output is inputted to a variable gain amplifier 32. The signal from the output filter 51 is also inputted to an high-frequency-range emphasizing circut 53 and on the basis of its output, a level sensor 54 controls the gain of the variable gain amplifier 52; when the level is above some value, an input and an output correspond to each other nearly in 1:1 proportion and when below the value, decibel linear expansion characteristics are provided and while the dynamic range is expanded apparently, the S/N is also improved depending upon the operation point.
JP8882680A 1980-06-30 1980-06-30 Dynamic range varying circuit Pending JPS5714211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8882680A JPS5714211A (en) 1980-06-30 1980-06-30 Dynamic range varying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8882680A JPS5714211A (en) 1980-06-30 1980-06-30 Dynamic range varying circuit

Publications (1)

Publication Number Publication Date
JPS5714211A true JPS5714211A (en) 1982-01-25

Family

ID=13953733

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8882680A Pending JPS5714211A (en) 1980-06-30 1980-06-30 Dynamic range varying circuit

Country Status (1)

Country Link
JP (1) JPS5714211A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972225A (en) * 1982-09-07 1984-04-24 ドルビ−・ラボラトリ−ズ・ライセンシング・コ−ポレ−シヨン Analog and digital signaling devices
JPH02222860A (en) * 1988-09-26 1990-09-05 Ind Technol Res Inst Alarm speech/time holder
US9623402B2 (en) 2013-04-30 2017-04-18 Mitsubishi Hitachi Power Systems, Ltd. Denitration catalyst and method for producing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972225A (en) * 1982-09-07 1984-04-24 ドルビ−・ラボラトリ−ズ・ライセンシング・コ−ポレ−シヨン Analog and digital signaling devices
JPH02222860A (en) * 1988-09-26 1990-09-05 Ind Technol Res Inst Alarm speech/time holder
US9623402B2 (en) 2013-04-30 2017-04-18 Mitsubishi Hitachi Power Systems, Ltd. Denitration catalyst and method for producing same

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