JPS5642408A - Electric power amplifying circuit - Google Patents

Electric power amplifying circuit

Info

Publication number
JPS5642408A
JPS5642408A JP11803079A JP11803079A JPS5642408A JP S5642408 A JPS5642408 A JP S5642408A JP 11803079 A JP11803079 A JP 11803079A JP 11803079 A JP11803079 A JP 11803079A JP S5642408 A JPS5642408 A JP S5642408A
Authority
JP
Japan
Prior art keywords
signal
circuit
electric power
envelope
waveform
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
JP11803079A
Other languages
Japanese (ja)
Inventor
Shingo Kamiya
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP11803079A priority Critical patent/JPS5642408A/en
Priority to US06/133,360 priority patent/US4348644A/en
Publication of JPS5642408A publication Critical patent/JPS5642408A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0233—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply
    • H03F1/0238—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply using supply converters

Abstract

PURPOSE:To eliminate fruitless electric power consumption by varying a supply voltage to an output element by detecting the mean level of the envelope waveform of the output signal of an electric power circuit and then by discriminating a pulsive music signal from the other sine-wave continuous signals on the basis of the detection result. CONSTITUTION:Acoustic signal S outputted by the voltage amplifying circuit is applied to bases of power transistors TR1 and TR2 of electric power amplifying circuit 1 and, after being power-amplified, is supplied to speaker 2 and envelope detecting circuit 3. This detecting circuit 3 detects one envelope signal waveform from acoustic signal S and applies corresponding envelope signal SE to level detecting circuit 4. Then circuit 4 detects the mean level in terms of the alternating current of the waveform of signal SE and comparator 5 compares mean level signal Sm to threshold voltage Es to discriminate a pulsive music signal from a continuous signal like a sine wave. Next, electric power source circuit 7 is controlled by the output of control circuit 6 to vary a supply voltage to circuit 1, thereby eliminating fruitless electric power consumption.
JP11803079A 1979-09-14 1979-09-14 Electric power amplifying circuit Pending JPS5642408A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11803079A JPS5642408A (en) 1979-09-14 1979-09-14 Electric power amplifying circuit
US06/133,360 US4348644A (en) 1979-09-14 1980-03-24 Power amplifying circuit with changing means for supply voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11803079A JPS5642408A (en) 1979-09-14 1979-09-14 Electric power amplifying circuit

Publications (1)

Publication Number Publication Date
JPS5642408A true JPS5642408A (en) 1981-04-20

Family

ID=14726314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11803079A Pending JPS5642408A (en) 1979-09-14 1979-09-14 Electric power amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5642408A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177236A (en) * 1982-04-05 1983-10-17 Mitsubishi Electric Corp Controller of electric discharge machining
JPS58177235A (en) * 1982-04-05 1983-10-17 Mitsubishi Electric Corp Controller of electric discharge machining
JPS59205223A (en) * 1983-05-02 1984-11-20 Mitsubishi Electric Corp Electric discharge machining device
JPS6190822A (en) * 1984-10-11 1986-05-09 Mitsubishi Electric Corp Electric discharge machining

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177236A (en) * 1982-04-05 1983-10-17 Mitsubishi Electric Corp Controller of electric discharge machining
JPS58177235A (en) * 1982-04-05 1983-10-17 Mitsubishi Electric Corp Controller of electric discharge machining
JPS59205223A (en) * 1983-05-02 1984-11-20 Mitsubishi Electric Corp Electric discharge machining device
JPS6190822A (en) * 1984-10-11 1986-05-09 Mitsubishi Electric Corp Electric discharge machining

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