FR2292994A1 - Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound - Google Patents

Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound

Info

Publication number
FR2292994A1
FR2292994A1 FR7438656A FR7438656A FR2292994A1 FR 2292994 A1 FR2292994 A1 FR 2292994A1 FR 7438656 A FR7438656 A FR 7438656A FR 7438656 A FR7438656 A FR 7438656A FR 2292994 A1 FR2292994 A1 FR 2292994A1
Authority
FR
France
Prior art keywords
sound
slide
track
switch
audio
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
FR7438656A
Other languages
French (fr)
Other versions
FR2292994B3 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7438656A priority Critical patent/FR2292994A1/en
Publication of FR2292994A1 publication Critical patent/FR2292994A1/en
Application granted granted Critical
Publication of FR2292994B3 publication Critical patent/FR2292994B3/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
    • G03B31/06—Associated working of cameras or projectors with sound-recording or sound-reproducing means in which sound track is associated with successively-shown still pictures

Abstract

The synchronisation of a slide projector with a sound track in an audio-visual message is achieved by changing slides whenever there is a sufficiently long pause in the sound track. An amplifier is connected to the signal from the sound track, and operates an electronic switch. In the absence of a sound signal the switch is open, allowing a capacitor to discharge. Unless the switch is closed by a sound level, hence re-charging the capacitor, the potential of the capacitor will fall low enough to trigger a mono-stable. This in turn operates a relay which commands the slide-projector. After a slide-change the switch is kept closed until the sound trck starts again, so that a long pause will not cause several slide changes.
FR7438656A 1974-11-26 1974-11-26 Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound Granted FR2292994A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7438656A FR2292994A1 (en) 1974-11-26 1974-11-26 Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7438656A FR2292994A1 (en) 1974-11-26 1974-11-26 Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound

Publications (2)

Publication Number Publication Date
FR2292994A1 true FR2292994A1 (en) 1976-06-25
FR2292994B3 FR2292994B3 (en) 1977-08-26

Family

ID=9145232

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7438656A Granted FR2292994A1 (en) 1974-11-26 1974-11-26 Audio-visual synchroniser for changing slides with taped commentary - uses pause in sound-track to cause slide to change, using switch open in absence of sound

Country Status (1)

Country Link
FR (1) FR2292994A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473280A (en) * 1981-05-22 1984-09-25 Staar S. A. Audio-visual cartridge and combined audio player and visual viewer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473280A (en) * 1981-05-22 1984-09-25 Staar S. A. Audio-visual cartridge and combined audio player and visual viewer

Also Published As

Publication number Publication date
FR2292994B3 (en) 1977-08-26

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Legal Events

Date Code Title Description
ST Notification of lapse