JPS57201345A - Radio receiver - Google Patents

Radio receiver

Info

Publication number
JPS57201345A
JPS57201345A JP8728181A JP8728181A JPS57201345A JP S57201345 A JPS57201345 A JP S57201345A JP 8728181 A JP8728181 A JP 8728181A JP 8728181 A JP8728181 A JP 8728181A JP S57201345 A JPS57201345 A JP S57201345A
Authority
JP
Japan
Prior art keywords
output
circuit
amplified
specified level
high frequency
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
JP8728181A
Other languages
Japanese (ja)
Inventor
Masaru Horiuchi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8728181A priority Critical patent/JPS57201345A/en
Publication of JPS57201345A publication Critical patent/JPS57201345A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To change characteristics in accordance with the state of receiving of radio waves by taking out a part of output of a medium frequency amplifier, amplifying to a specified level, and removing high frequency component of voice signal when the state of receiving of radio broadcasting waves becomes below a specified level. CONSTITUTION:When the intensity of input electric field becomes below a predetermined level, radio waves induced in an antenna 11 are channel selected and amplified by a high frequency amplifier 12 and converted to intermediate frequency signal by a frequency converter 13. Output of the frequency converter 13 is amplified by an intermediate frequency amplifier 14 and demodulated to voice frequency signal by a wave detection circuit 15 and at the same time amplified to a specified level by an intermediate frequency amplifying circuit 211. Output of the amplifying circuit 211 is converted to d.c. voltage by a wave detection inversion circuit 212 and becomes output voltage of inverted polarity. Output of the detection inversion circuit 212 is applied to a transistor (TR) 222, and the TR222 conducts. Consequently, impedance between collector and emitter of TR222 is lowered and a low-pass filter enlarges attenuation of high frequency component of output of the detection circuit.
JP8728181A 1981-06-03 1981-06-03 Radio receiver Pending JPS57201345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8728181A JPS57201345A (en) 1981-06-03 1981-06-03 Radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8728181A JPS57201345A (en) 1981-06-03 1981-06-03 Radio receiver

Publications (1)

Publication Number Publication Date
JPS57201345A true JPS57201345A (en) 1982-12-09

Family

ID=13910396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8728181A Pending JPS57201345A (en) 1981-06-03 1981-06-03 Radio receiver

Country Status (1)

Country Link
JP (1) JPS57201345A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334354U (en) * 1989-08-11 1991-04-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334354U (en) * 1989-08-11 1991-04-04

Similar Documents

Publication Publication Date Title
TW331681B (en) Wide-band low-noise low-crossover distortion receiver
CA2053778A1 (en) Output level control circuit for use in rf power amplifier
KR950701468A (en) Parallel non-tuned intermediate frequency amplifiers supply signals from each of the television's first detectors through their respective input filters
KR830004740A (en) Surface acoustic wave filter preamplifier
US4466129A (en) Noise reducing circuitry for single sideband receivers
KR870001706A (en) Frequency converter
GB1518574A (en) Sound reproducing system
JPS57201345A (en) Radio receiver
JPS5517826A (en) Voice starting device for tape recorder
JPS54140442A (en) Automatic sensitivity control circuit for receiver
JPS57120207A (en) Reproducing device for multiple-recorded information
JPS55134554A (en) Radio receiver
JPS56146381A (en) Television voice receiving device
JPS6041331A (en) radio receiver
JPS54152414A (en) Squelch system of fm mobile radio equipment
JPS5610750A (en) Radio receiver
KR900002073Y1 (en) Noise signal cancellation circuit
JPS57186842A (en) Demodulator of frequency-modulated receiver
JPS5784628A (en) Mobile radio device
SU1633501A1 (en) Radio receiver front end
JPS56149128A (en) Radio receiver for vehicle
JPS54157017A (en) Fm signal receiving circuit
JPS5467712A (en) Squelch circuit
JPS54157018A (en) Fm receiver
JPS56149127A (en) Radio receiver for vehicle