Depth of fade indicating LED

Details Depth of fade indicating LED Depth of fade indicating LED

1994-04-14

1996-06-25

Isen, Forester W.

Electrical audio signal processing systems and devices

With mixer

381104, 381109, H04B 100, H03G 300

Patent

active

055307655

ABSTRACT:
Disclosed is an audio follow video mixer apparatus having a circuit which indicates the position of an adjustable depth of fade control member. When the depth of fade control member is adjusted to a position which does not permit full attenuation of an audio signal according to a FADE control signal, a depth of fade LED indicator is illuminated. According to one embodiment, the LED is driven by a Schmidt inverter directly coupled to the FADE control signal line. According to an alternative embodiment, the depth of fade control member is a dual element fader having a first element in the FADE signal path and a second element biased to drive the depth of fade LED indicator according to the position of the depth of fade control member.

REFERENCES:
patent: 5175771 (1992-12-01), Zampini et al.
patent: 5177801 (1993-01-01), Shoda et al.
patent: 5210502 (1993-05-01), Flum et al.
patent: 5230024 (1993-07-01), Zampini et al.
patent: 5259034 (1993-11-01), Lumsden
patent: 5317641 (1994-05-01), Yasuda et al.
patent: 5319359 (1994-06-01), Zampini et al.
patent: 5424679 (1995-06-01), Rappoport
patent: 5434539 (1995-07-01), Rappoport

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