JPS5570139A - Tuner for wire broadcasting television - Google Patents

Tuner for wire broadcasting television

Info

Publication number
JPS5570139A
JPS5570139A JP14375778A JP14375778A JPS5570139A JP S5570139 A JPS5570139 A JP S5570139A JP 14375778 A JP14375778 A JP 14375778A JP 14375778 A JP14375778 A JP 14375778A JP S5570139 A JPS5570139 A JP S5570139A
Authority
JP
Japan
Prior art keywords
frequency
signal
vhf
circuit
mixer
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
JP14375778A
Other languages
Japanese (ja)
Inventor
Tomiji Chikaraishi
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 Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
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 Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP14375778A priority Critical patent/JPS5570139A/en
Publication of JPS5570139A publication Critical patent/JPS5570139A/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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/006—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • 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

Abstract

PURPOSE:To simplify the circuit constitution by selecting the oscillation frequency of the 1st local oscillator more than double the higher limit frequency of the reception frequency at the VHF band and thus reducing the image disturbance as well as decreasing the number of the switching circuits. CONSTITUTION:The TV signal of the VHF band applied to VHF input terminal 1 is added to 1st mixer 23 and then mixed with the signal of 1st local oscillator 26 to be converted into the 1st intermediate frequency of the UHF band. At the same time, the UHF band signal supplied to UHF input terminal 4 is applied to switching circuit 7 via amplifier 6. The 1st intermediate frequency of the frequency-converted VHF is applied to circuit 7 via mixer 23, and the signal processing is given to the outout switched through circuit 7 via tuning circuits 18 and 20 featuring the variable frequency plus 2nd mixer 21. And the 2nd intermediate frequency signal is delivered to output terminal 22. The oscillation frequency of oscillator 26 is selected more than double the higher limit level of the reception frequency of the VHF band supplied through terminal 1. In such way, the image disturbance is reduced, at the same time decreasing the number of the switching circuits.
JP14375778A 1978-11-21 1978-11-21 Tuner for wire broadcasting television Pending JPS5570139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14375778A JPS5570139A (en) 1978-11-21 1978-11-21 Tuner for wire broadcasting television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14375778A JPS5570139A (en) 1978-11-21 1978-11-21 Tuner for wire broadcasting television

Publications (1)

Publication Number Publication Date
JPS5570139A true JPS5570139A (en) 1980-05-27

Family

ID=15346305

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14375778A Pending JPS5570139A (en) 1978-11-21 1978-11-21 Tuner for wire broadcasting television

Country Status (1)

Country Link
JP (1) JPS5570139A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761206U (en) * 1980-09-30 1982-04-12
JPS5762639A (en) * 1980-10-01 1982-04-15 Matsushita Electric Ind Co Ltd Wide band receiving tuner
JPS6281188A (en) * 1985-10-03 1987-04-14 Pioneer Electronic Corp Up-down converter for catv

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5192110A (en) * 1975-02-12 1976-08-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5192110A (en) * 1975-02-12 1976-08-12

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761206U (en) * 1980-09-30 1982-04-12
JPS612811Y2 (en) * 1980-09-30 1986-01-29
JPS5762639A (en) * 1980-10-01 1982-04-15 Matsushita Electric Ind Co Ltd Wide band receiving tuner
JPS6281188A (en) * 1985-10-03 1987-04-14 Pioneer Electronic Corp Up-down converter for catv

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