FR2275094A1 - Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference - Google Patents

Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference

Info

Publication number
FR2275094A1
FR2275094A1 FR7420967A FR7420967A FR2275094A1 FR 2275094 A1 FR2275094 A1 FR 2275094A1 FR 7420967 A FR7420967 A FR 7420967A FR 7420967 A FR7420967 A FR 7420967A FR 2275094 A1 FR2275094 A1 FR 2275094A1
Authority
FR
France
Prior art keywords
television receiver
ultrasonic frequencies
local interference
remote control
avoid false
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.)
Withdrawn
Application number
FR7420967A
Other languages
French (fr)
Inventor
Jean-Claude Bertrand
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.)
Schneider Radio Television SA
Original Assignee
Schneider Radio Television SA
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 Schneider Radio Television SA filed Critical Schneider Radio Television SA
Priority to FR7420967A priority Critical patent/FR2275094A1/en
Publication of FR2275094A1 publication Critical patent/FR2275094A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J9/00—Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification
    • H03J9/04—Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification using ultrasonic, sonic or infrasonic waves

Abstract

Two ultrasonic frequencies, F1 and F2 are used in this control system. In the transmitter, one of several switches can be operated which causes the main oscillator to be energised and F1 to be transmitted. After a time period, determined by the switch selected, an additional tuning condenser changes the oscillator frequency to F2. In the receiver, after receiving F1, a chain of pulses is triggered which operates a counter circuit. After receiving F2, the counter stops. The counter output is decoded and operates a remotely controlled circuit. This is suitable for television receiver control and is not susceptible to local interference.
FR7420967A 1974-06-17 1974-06-17 Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference Withdrawn FR2275094A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7420967A FR2275094A1 (en) 1974-06-17 1974-06-17 Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7420967A FR2275094A1 (en) 1974-06-17 1974-06-17 Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference

Publications (1)

Publication Number Publication Date
FR2275094A1 true FR2275094A1 (en) 1976-01-09

Family

ID=9140154

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7420967A Withdrawn FR2275094A1 (en) 1974-06-17 1974-06-17 Television receiver remote control - uses two ultrasonic frequencies to avoid false switching by local interference

Country Status (1)

Country Link
FR (1) FR2275094A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114099A (en) * 1976-03-31 1978-09-12 Harry Hollander Ultrasonic television remote control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114099A (en) * 1976-03-31 1978-09-12 Harry Hollander Ultrasonic television remote control system

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Legal Events

Date Code Title Description
ST Notification of lapse