JPS55153444A - Automatic switching unit for stereo-monaural - Google Patents

Automatic switching unit for stereo-monaural

Info

Publication number
JPS55153444A
JPS55153444A JP6041879A JP6041879A JPS55153444A JP S55153444 A JPS55153444 A JP S55153444A JP 6041879 A JP6041879 A JP 6041879A JP 6041879 A JP6041879 A JP 6041879A JP S55153444 A JPS55153444 A JP S55153444A
Authority
JP
Japan
Prior art keywords
stereo
base
switching
monaural
resistances
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
JP6041879A
Other languages
Japanese (ja)
Inventor
Satoru Yamamoto
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6041879A priority Critical patent/JPS55153444A/en
Publication of JPS55153444A publication Critical patent/JPS55153444A/en
Pending 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals

Abstract

PURPOSE:To effectively use this unit for car radios, by avoiding the switching operation while the changing width of the strength of electric field is not so much great, through the hysteresis characteristics given to the switching operation of stereo and monaural to the level change of input signal. CONSTITUTION:The switching unit 21 is provided with the second switching transistor TR19, the base is connected with the connection between the resistances 13, 14 and the capacitor 15 the same as the case with the base of the first switching TR16, and the collector is connected to the base of TR10 via the resistance 20. If the input signal level of FM stereo broadcast is not reached to the specified value, the negative voltage level at the point A is low, TR16 turns on into monaural reception state. Further, in this case, TR19 also turns on, and the base bias of TR10 is lower by the amount corresponding to the resistance 20 inserted in parallel with the resistor 7 than the resistances 6 and 7, resulting that the amplification factor of IF signal by TR10 is comparatively low. Further, if the strength of electric field increases and the negative voltage level at the point A reaches the specified value, TR16 is OFF and stereo demodulation 4 operation is obtained.
JP6041879A 1979-05-18 1979-05-18 Automatic switching unit for stereo-monaural Pending JPS55153444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6041879A JPS55153444A (en) 1979-05-18 1979-05-18 Automatic switching unit for stereo-monaural

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6041879A JPS55153444A (en) 1979-05-18 1979-05-18 Automatic switching unit for stereo-monaural

Publications (1)

Publication Number Publication Date
JPS55153444A true JPS55153444A (en) 1980-11-29

Family

ID=13141622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6041879A Pending JPS55153444A (en) 1979-05-18 1979-05-18 Automatic switching unit for stereo-monaural

Country Status (1)

Country Link
JP (1) JPS55153444A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57174957A (en) * 1981-04-21 1982-10-27 Sanyo Electric Co Ltd Multi-path interference rejecting circuit
JPS5946042U (en) * 1982-09-18 1984-03-27 アルパイン株式会社 FM receiver
JPS6077148U (en) * 1983-10-31 1985-05-29 パイオニア株式会社 FM stereo receiver
FR2583598A1 (en) * 1985-06-14 1986-12-19 Pioneer Electronic Corp STEREOPHONIC RECEPTION CIRCUIT WITH IMPROVED SWITCHING BETWEEN STEREOPHONIC AND MONOPHONIC MODES

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57174957A (en) * 1981-04-21 1982-10-27 Sanyo Electric Co Ltd Multi-path interference rejecting circuit
JPH0347614B2 (en) * 1981-04-21 1991-07-19 Sanyo Electric Co
JPS5946042U (en) * 1982-09-18 1984-03-27 アルパイン株式会社 FM receiver
JPS6077148U (en) * 1983-10-31 1985-05-29 パイオニア株式会社 FM stereo receiver
JPH0247651Y2 (en) * 1983-10-31 1990-12-14
FR2583598A1 (en) * 1985-06-14 1986-12-19 Pioneer Electronic Corp STEREOPHONIC RECEPTION CIRCUIT WITH IMPROVED SWITCHING BETWEEN STEREOPHONIC AND MONOPHONIC MODES

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