JPS5732153A - Demodulating circuit - Google Patents

Demodulating circuit

Info

Publication number
JPS5732153A
JPS5732153A JP10787980A JP10787980A JPS5732153A JP S5732153 A JPS5732153 A JP S5732153A JP 10787980 A JP10787980 A JP 10787980A JP 10787980 A JP10787980 A JP 10787980A JP S5732153 A JPS5732153 A JP S5732153A
Authority
JP
Japan
Prior art keywords
trs
reception
circuit
collectors
bases
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
JP10787980A
Other languages
Japanese (ja)
Other versions
JPS5856292B2 (en
Inventor
Kozo Suzuki
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.)
Toko Inc
Original Assignee
Toko Inc
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 Toko Inc filed Critical Toko Inc
Priority to JP10787980A priority Critical patent/JPS5856292B2/en
Publication of JPS5732153A publication Critical patent/JPS5732153A/en
Publication of JPS5856292B2 publication Critical patent/JPS5856292B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
    • H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
    • H04H40/72—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for noise suppression
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits
    • H03D1/2209—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders
    • H03D1/2227—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders using switches for the decoding

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To stabilize the output of a demodulating circuit by turning off the transistor (TR) of a differential amplifier when changing stereophonic broadcast reception over to monaural reception, and by adjusting the gain of a TR connected to it. CONSTITUTION:The collectors of TRs Q1 and Q2 in one differential TR couple of a differential amplifier are connected in common, and a resistance R3 is connected between the bases of the TRs Q1 and Q2. The collectors of TRs Q3 and Q4 facing to the TRs Q1 and Q2 are connected in common, and a resistance R8 is connected between the bases of the TRs Q3 and Q4. When the intensity of an input signal from a switching circuit 6 decreases below prescribed one, TRs Q5 and Q6 turn on, and the TRs Q2 and Q3 turn off, stopping the supply of a 38kHz signal from a waveform shaping circuit 5 to a chopper circuit B. Consequently, stereophonic reception is changed over to monaural reception, and the deterioration of the SN ratio is prevented.
JP10787980A 1980-08-06 1980-08-06 Demodulation circuit Expired JPS5856292B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10787980A JPS5856292B2 (en) 1980-08-06 1980-08-06 Demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10787980A JPS5856292B2 (en) 1980-08-06 1980-08-06 Demodulation circuit

Publications (2)

Publication Number Publication Date
JPS5732153A true JPS5732153A (en) 1982-02-20
JPS5856292B2 JPS5856292B2 (en) 1983-12-14

Family

ID=14470395

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10787980A Expired JPS5856292B2 (en) 1980-08-06 1980-08-06 Demodulation circuit

Country Status (1)

Country Link
JP (1) JPS5856292B2 (en)

Also Published As

Publication number Publication date
JPS5856292B2 (en) 1983-12-14

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