Video switcher apparatus for wide screen EDTV signals

Details Video switcher apparatus for wide screen EDTV signals Video switcher apparatus for wide screen EDTV signals

1992-04-03

1994-07-05

Groody, James J.

Television

Format

Of sync signal

348386, 348460, H04N 704, H04N 5268

Patent

active

053272366

ABSTRACT:
A compatible special effect signal can be produced without using an encoder or a special signal processor. Each of EDTV signals is divided into a main screen signal and a compensation screen signal. Compensation screen modification circuits modify the special position and size of the compensation screen signals such that the compensation screen signals match with the main screen signals in spacial position and size. The modified signals and the main screen signals are multiplexed in a frequency domain. The multiplexed signals are gated in response to a wipe signal and the gated signals are mixed with each other. The mixed signal is separated into the main screen signal and the compensation screen signal in the frequency domain. A compensation screen signal restorer circuit converts the frequency separated compensation screen signal into the original compensation signal which is mixed with the main screen signal to generate the wiped wide screen EDTV signal.

REFERENCES:
patent: 4772949 (1988-09-01), Nadan
patent: 4959717 (1990-09-01), Faroudja
patent: 4975771 (1990-12-01), Kassatly
patent: 5138455 (1992-08-01), Okumura et al.

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