JPS5494814A - Tuner unit - Google Patents

Tuner unit

Info

Publication number
JPS5494814A
JPS5494814A JP212778A JP212778A JPS5494814A JP S5494814 A JPS5494814 A JP S5494814A JP 212778 A JP212778 A JP 212778A JP 212778 A JP212778 A JP 212778A JP S5494814 A JPS5494814 A JP S5494814A
Authority
JP
Japan
Prior art keywords
attenuator
output
detector
reference level
comparator
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
JP212778A
Other languages
Japanese (ja)
Other versions
JPS58694B2 (en
Inventor
Joji Kane
Michio Okamoto
Eishin Kakihara
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP212778A priority Critical patent/JPS58694B2/en
Publication of JPS5494814A publication Critical patent/JPS5494814A/en
Publication of JPS58694B2 publication Critical patent/JPS58694B2/en
Expired 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
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To extend the dynamic range by selecting the attenuator depending on the input signal level. CONSTITUTION:The signal incoming to the antenna 1 is inputted to the detector 8 via the ON-OFF attenuator 2, high frequency amplifier 3, mixer 4, intermediate frequency amplifier 6, ON-OFF attenuator 7, and the detected output is outputted to the output terminal 9. A part of the output of the detector 8 is picked up, and the attenuator driver 12 is driven with the output compared with the reference level 10 at the comparator 11, controlling the ON-OFF attenuator 2. The comparison output of the comparator 11 is also fed to the signal inverter 13, and the inverted output controls the ON-OFF attenuator 7 via the attenuator driver 14. When the detected output of the detector is smaller than the reference level, the attenuator 2 is OFF and the attenuator 7 is ON. When it is greater than the reference level, the condition is converse.
JP212778A 1978-01-11 1978-01-11 tuner device Expired JPS58694B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP212778A JPS58694B2 (en) 1978-01-11 1978-01-11 tuner device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP212778A JPS58694B2 (en) 1978-01-11 1978-01-11 tuner device

Publications (2)

Publication Number Publication Date
JPS5494814A true JPS5494814A (en) 1979-07-26
JPS58694B2 JPS58694B2 (en) 1983-01-07

Family

ID=11520667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP212778A Expired JPS58694B2 (en) 1978-01-11 1978-01-11 tuner device

Country Status (1)

Country Link
JP (1) JPS58694B2 (en)

Also Published As

Publication number Publication date
JPS58694B2 (en) 1983-01-07

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