Video and sound recording device with automatic focusing system

Details Video and sound recording device with automatic focusing system Video and sound recording device with automatic focusing system

1982-05-12

1984-09-18

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358906, 352140, H04N 526

Patent

active

044727429

ABSTRACT:
There are video and sound recording devices such as movie cameras or video cameras with an automatic focusing system of the type for setting a photographic lens to a position at which an object can be sharply focused in response to the signal which is representative of a distance from the camera to the object and obtained by measuring the time interval from the time when the ultrasonic waves are transmitted at a predetermined repetition frequency to the object to the time when the echo from the object is received. Such devices have a common defect that a microphone picks up impulse-like noise generated from an ultrasonic transducer especially at the start point of ultrasonic waves. To overcome this problem, the present invention provides an audible noise elimination or suppression means or a control circuit which operates in synchronism with the ultrasonic wave transmission so that an audio signal processing system attenuates the audio output signal.

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