JPS56158529A - Receiver - Google Patents

Receiver

Info

Publication number
JPS56158529A
JPS56158529A JP6141580A JP6141580A JPS56158529A JP S56158529 A JPS56158529 A JP S56158529A JP 6141580 A JP6141580 A JP 6141580A JP 6141580 A JP6141580 A JP 6141580A JP S56158529 A JPS56158529 A JP S56158529A
Authority
JP
Japan
Prior art keywords
section
tuning
electric field
gain
field intensity
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
JP6141580A
Other languages
Japanese (ja)
Other versions
JPS6230536B2 (en
Inventor
Masami Miura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6141580A priority Critical patent/JPS56158529A/en
Publication of JPS56158529A publication Critical patent/JPS56158529A/en
Publication of JPS6230536B2 publication Critical patent/JPS6230536B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To ensure the operation of tuning detection and to prevent the deterioration of S/N, by changing the amplification gain of the reception signal level with the output signal of a tuning detection circuit, in an AM receiver providing a tuning detection circuit. CONSTITUTION:In an automatic tuning tape AM receiver by automatic frequency sweep, if no tuning is taken and the intensity of electric field is weak, the H level signal of a tuning detection section 8 closes a gate circuit section 15, and the criterion electric field intensity can be decided with a local distance section 12, variable resistor 14, the gain of the amplifier stage of a reception section, and discrimination level of the section 8. Thus, the gain of an antenna tuning section 2 is decreased even at a strong electric field intensity, allowing to ensure the criterion of the section 8 accurately. If the input electric field intensity is greater than the apparent criterion electric field intensity, the gate 15 is opened with the L level output signal to be the frequency sweep stop signal of the section 8, the gain of the section 2 is controlled by not the resistor 14 but an AGC circuit 11, the gain of the section 2 is increased, and the S/N of the detected output to be obtained is made excellent.
JP6141580A 1980-05-09 1980-05-09 Receiver Granted JPS56158529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6141580A JPS56158529A (en) 1980-05-09 1980-05-09 Receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6141580A JPS56158529A (en) 1980-05-09 1980-05-09 Receiver

Publications (2)

Publication Number Publication Date
JPS56158529A true JPS56158529A (en) 1981-12-07
JPS6230536B2 JPS6230536B2 (en) 1987-07-02

Family

ID=13170448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6141580A Granted JPS56158529A (en) 1980-05-09 1980-05-09 Receiver

Country Status (1)

Country Link
JP (1) JPS56158529A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509204A (en) * 1983-09-23 1985-04-02 National Semiconductor Corporation AM Radio stop detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509204A (en) * 1983-09-23 1985-04-02 National Semiconductor Corporation AM Radio stop detector

Also Published As

Publication number Publication date
JPS6230536B2 (en) 1987-07-02

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