Decoder apparatus applicable to matrix 4-channel systems of diff

Details Decoder apparatus applicable to matrix 4-channel systems of diff Decoder apparatus applicable to matrix 4-channel systems of diff

1975-11-04

1977-05-03

Olms, Douglas W.

H04R 500

Patent

active

040216128

ABSTRACT:
This invention discloses a control circuit to be used in a decoder apparatus applicable to matrix 4-channel systems of different types. The control circuit is adapted to control, according to the type of composite signals to be decoded by the decoder apparatus, at least first and second gain control amplifiers which control the amplitude ratio between signals to be combined into output signals, and includes an FET array comprised of at least four field effect transistors formed in a semiconductor chip. First and second field effect transistors in the FET array are so connected to a DC power source that different predetermined DC currents may flow through their source-drain paths. To the first and second gain control amplifiers, third and fourth field effect transistors of the FET array are coupled respectively in such a manner that the internal resistances between their source-drain paths control the gains of the first and second amplifiers. The third and fourth field effect transistors are supplied with DC bias volates produced by either the first field effect transistor or the second field effect transistor, selectively in accordance with the type of the composite signals to be decoded.

REFERENCES:
patent: 3691298 (1972-09-01), Pittman et al.
patent: 3783192 (1974-01-01), Takahashi
patent: 3825684 (1974-07-01), Ito et al.
patent: 3836715 (1974-09-01), Ito et al.
patent: 3887770 (1975-06-01), Takahashi
patent: 3934086 (1976-01-01), Takahashi

Affiliated with

Also associated with

Rating

Decoder apparatus applicable to matrix 4-channel systems of diff does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Decoder apparatus applicable to matrix 4-channel systems of diff, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoder apparatus applicable to matrix 4-channel systems of diff will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-346692