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JPS5791012A - Level detection circuit - Google Patents

Level detection circuit

Info

Publication number
JPS5791012A
JPS5791012A JP16584880A JP16584880A JPS5791012A JP S5791012 A JPS5791012 A JP S5791012A JP 16584880 A JP16584880 A JP 16584880A JP 16584880 A JP16584880 A JP 16584880A JP S5791012 A JPS5791012 A JP S5791012A
Authority
JP
Japan
Prior art keywords
output
operational amplifier
circuit
amplifier
voltage
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
JP16584880A
Other languages
Japanese (ja)
Other versions
JPS6351410B2 (en
Inventor
Masayuki Katakura
Kenzo Akagiri
Motomi Okochi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP16584880A priority Critical patent/JPS5791012A/en
Priority to AU77881/81A priority patent/AU551633B2/en
Priority to CA000390987A priority patent/CA1171921A/en
Priority to CH756981A priority patent/CH655415B/de
Priority to IT25303/81A priority patent/IT1140300B/en
Priority to GB8135662A priority patent/GB2088677B/en
Priority to AT0510481A priority patent/AT381422B/en
Priority to NL8105379A priority patent/NL192906C/en
Priority to BE2/59478A priority patent/BE891270A/en
Priority to FR8122297A priority patent/FR2494930B1/en
Priority to US06/325,207 priority patent/US4433254A/en
Priority to KR8104660A priority patent/KR880001595B1/en
Priority to DE19813147171 priority patent/DE3147171A1/en
Publication of JPS5791012A publication Critical patent/JPS5791012A/en
Publication of JPS6351410B2 publication Critical patent/JPS6351410B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • 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 widen the dynamic range having desired leading and trailing characteristics, by inputting a signal voltage in logarithmic conversion to an operational amplifier, integrating the output via a P-N junction element, and feeding back the output of integration to an amplifier through resistance division.
CONSTITUTION: An input signal at a terminal 11 is logarithmic-converted at an operational amplifier 31 via an absolute circuit 20 and applied to a noninverting input terminal of an operational amplifier 33. The amplified 33 output is applied to an integration capacitor C35 via a diode D34, and output voltage Vc is given to a series circuit consisting of a D41 and a reference current source 42 via an operational amplifier 40, and a logarithmic compression type level detecting output is obtained from a terminal 12. The amplified 40 output is applied to a voltage division circuit 46, and the output is fed back to an inverting input of the amplifier 33. The output of the amplifier 33 is given to a circuit 46 via a compensation diode 43 and an operational amplifier 45. With the constitution like this, the conversion characteristics of the output voltage is independent of the dividing ratio of the circuit 46 and the dynamic range can be extended with desired leading and trailing characteristics.
COPYRIGHT: (C)1982,JPO&Japio
JP16584880A 1980-11-27 1980-11-27 Level detection circuit Granted JPS5791012A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
JP16584880A JPS5791012A (en) 1980-11-27 1980-11-27 Level detection circuit
AU77881/81A AU551633B2 (en) 1980-11-27 1981-11-25 Signal level detecting circuit
CA000390987A CA1171921A (en) 1980-11-27 1981-11-26 Level detecting circuit
CH756981A CH655415B (en) 1980-11-27 1981-11-26
IT25303/81A IT1140300B (en) 1980-11-27 1981-11-26 SIGNAL LEVEL DETECTION CIRCUIT
GB8135662A GB2088677B (en) 1980-11-27 1981-11-26 Signal level detecting circuits
AT0510481A AT381422B (en) 1980-11-27 1981-11-26 LEVEL SAMPLE LEVEL
NL8105379A NL192906C (en) 1980-11-27 1981-11-27 Signal level detection circuit.
BE2/59478A BE891270A (en) 1980-11-27 1981-11-27 TRANSMISSION LEVEL DETECTION CIRCUIT
FR8122297A FR2494930B1 (en) 1980-11-27 1981-11-27 CIRCUIT FOR DETECTING A SIGNAL LEVEL
US06/325,207 US4433254A (en) 1980-11-27 1981-11-27 Level detecting circuit
KR8104660A KR880001595B1 (en) 1980-11-27 1981-11-27 Level detector cicuit
DE19813147171 DE3147171A1 (en) 1980-11-27 1981-11-27 SIGNAL LEVEL DETECTOR CIRCUIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16584880A JPS5791012A (en) 1980-11-27 1980-11-27 Level detection circuit

Publications (2)

Publication Number Publication Date
JPS5791012A true JPS5791012A (en) 1982-06-07
JPS6351410B2 JPS6351410B2 (en) 1988-10-13

Family

ID=15820143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16584880A Granted JPS5791012A (en) 1980-11-27 1980-11-27 Level detection circuit

Country Status (2)

Country Link
JP (1) JPS5791012A (en)
BE (1) BE891270A (en)

Also Published As

Publication number Publication date
JPS6351410B2 (en) 1988-10-13
BE891270A (en) 1982-03-16

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