Microphone apparatus for a video camera

Details Microphone apparatus for a video camera Microphone apparatus for a video camera

1989-05-26

1991-01-08

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

352 5, H04N 5225

Patent

active

049840878

ABSTRACT:
A microphone apparatus for a video camera having a zoom lens, comprising: a superdirectional microphone fro generating a superdirectional microphone signal D; a stereo microphone for generating stereo microphone signals L and R; a zoom position sensor for generating a zoom position signal; first and second signal means for generating control signals Vc1 and Vc2 which can be changed according to the zoom position signal; a first amplifier for generating a first amplified signal K1.multidot.D (K1 is a value corresponding to Vc1); a second amplifier for generating a second amplified signal K2.multidot.L (K2 is a value corresponding to Vc2); a third amplifier for generating a third amplified signal K2.multidot.R; a first adder for generating a first sum signal (k1.multidot.D+K2.multidot.L); and a second adding means for generating a second sum signal (k1.multidot.D+K2.multidot.R). The directivity can be varied in accordance with the control of the zoom lens to suitably match images and sounds.

REFERENCES:
patent: 3837736 (1974-09-01), Oglso et al.
patent: 4472742 (1984-09-01), Hasegawa et al.
patent: 4531822 (1985-07-01), Shenk
patent: 4594610 (1986-06-01), Patel
patent: 4862278 (1989-08-01), Dann et al.
"Zoom Microphone," Yukinobu Ishigaki et al., Presented at 67th Convention, Audio Engineering Society, Oct. 31-Nov. 3, 1980, New York, NY.

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