JPS5698013A - Logarithmic amplifying circuit - Google Patents

Logarithmic amplifying circuit

Info

Publication number
JPS5698013A
JPS5698013A JP17321179A JP17321179A JPS5698013A JP S5698013 A JPS5698013 A JP S5698013A JP 17321179 A JP17321179 A JP 17321179A JP 17321179 A JP17321179 A JP 17321179A JP S5698013 A JPS5698013 A JP S5698013A
Authority
JP
Japan
Prior art keywords
slicers
high frequency
amplifiers
amplifying circuit
constitution
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
JP17321179A
Other languages
Japanese (ja)
Inventor
Yasumitsu Tani
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17321179A priority Critical patent/JPS5698013A/en
Publication of JPS5698013A publication Critical patent/JPS5698013A/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
    • H03G7/001—Volume compression or expansion in amplifiers without controlling loop

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To reduce such phenomenon in which a small signal is suppressed by a larger signal in case when several signals are added together, by giving a simple modification to the constitution of a logarithmic amplifying circuit. CONSTITUTION:The level variable slicers LS1 and so on are provided at the front stage of each of the high frequency amplifiers A1 and so on. The detection output obtained by detecting the outputs of corresponding amplifiers A1 and so on by the corresponding wave detectors D1 and so on is fed back partially to the above- mentioned slicers via the corresponding low pass filters LF1 and so on. Thus the slicing levels of the slicers are controlled in accordance with the high frequency input, and then the signals requiring no high frequency input are sliced to such degree at which the amplifiers A1 and so on are not saturated. Then the AM detection waveform of each stage is added together through the adder AD to obtain the output waveform.
JP17321179A 1979-12-30 1979-12-30 Logarithmic amplifying circuit Pending JPS5698013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17321179A JPS5698013A (en) 1979-12-30 1979-12-30 Logarithmic amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17321179A JPS5698013A (en) 1979-12-30 1979-12-30 Logarithmic amplifying circuit

Publications (1)

Publication Number Publication Date
JPS5698013A true JPS5698013A (en) 1981-08-07

Family

ID=15956171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17321179A Pending JPS5698013A (en) 1979-12-30 1979-12-30 Logarithmic amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5698013A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100010A (en) * 1985-10-25 1987-05-09 Mitsubishi Electric Corp Logarithmic amplifier
JPS62101109A (en) * 1985-10-28 1987-05-11 Mitsubishi Electric Corp Logarithmic amplifier
US11503884B2 (en) 2019-07-15 2022-11-22 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Mounting and locking mechanism, casing, and wearable device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100010A (en) * 1985-10-25 1987-05-09 Mitsubishi Electric Corp Logarithmic amplifier
JPH055405B2 (en) * 1985-10-25 1993-01-22 Mitsubishi Electric Corp
JPS62101109A (en) * 1985-10-28 1987-05-11 Mitsubishi Electric Corp Logarithmic amplifier
JPH0511681B2 (en) * 1985-10-28 1993-02-16 Mitsubishi Electric Corp
US11503884B2 (en) 2019-07-15 2022-11-22 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Mounting and locking mechanism, casing, and wearable device

Similar Documents

Publication Publication Date Title
CA2083954A1 (en) Feed forward amplifier network with frequency swept pilot tone
JPS5698013A (en) Logarithmic amplifying circuit
JPS5679509A (en) Automatic gain control circuit
JPS56146381A (en) Television voice receiving device
JPS55140311A (en) Sound volume automatic control unit of noise control type speaker
SU1023629A1 (en) Device for directing amplitude-modulated signals
JPS558657A (en) Signal delay circuit
JPS54157018A (en) Fm receiver
JPS5585145A (en) Phase synchronizer
JPS55133112A (en) Amplifier of microwave band refelection type
JPS5769507A (en) Fm demodulating circuit
SU849499A1 (en) Periodic signal receiver
SU557474A1 (en) Device for automatic sensitivity adjustment of the receiver
JPS55143877A (en) Video intermediate frequency signal processing circuit
JPS5657319A (en) Detector of input signal level
JPS53139414A (en) Squelch circuit system for fm receiver
JPS56106435A (en) Fm receiver
JPS5671336A (en) Fpu receiver
JPS55114031A (en) Detector for pulse absence
JPS5644212A (en) Agc circuit
JPS56115925A (en) Optical signal detecting and amplifying circuit
JPS5535521A (en) Pilot signal eliminator for stereoreceiver
SU760882A1 (en) DEVICE FOR PROCESSING COMPLEX SIGNAL ON THE BACKGROUND OF FOCUSED INTERFERENCE
GB1010446A (en) Negative feedback phase detection receiving equipment
JPS56149896A (en) Driving circuit of speaker