Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-03-13
1982-09-07
Konick, Bernard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
360 65, 360 33, 358 8, H04N 576
Patent
active
043486924
ABSTRACT:
Equalizer circuitry for a wideband signal recording/playback system, in particular a home video system, comprises a pre-emphasis and a de-emphasis circuit in the recording channel and the playback channel respectively. In an advantageous embodiment, the pre-emphasis and de-emphasis circuits are of the second-order type. In the preferred embodiment of the circuitry, in each of said channels there is provided a circuit for group-delay equalization, preferably an all-pass filter which comprises at least one substantially symmetrical transistor stage provided with a bridge circuit consisting of at least one reactive impedance and ohmic resistance and located between emitter and collector. Practical embodiments of the bridge circuit comprise several series-connected parallel LC sections and one ohmic resistance. Advantageously, conventional filter stages in the channels may be at least partially included in said circuit for group-delay equalization. Conventional delay means provided in color video systems for equalization of the delay between color and video signals can therefore be integrated in said circuit for group-delay equlization.
REFERENCES:
patent: 3122716 (1964-02-01), Whang
patent: 3340367 (1967-09-01), Coleman
patent: 3518581 (1970-06-01), Hughes
patent: 3564123 (1971-02-01), Pezirtzoglov
patent: 3728475 (1973-04-01), Inoue
patent: 3800265 (1974-03-01), Yoshioka
patent: 3868604 (1975-02-01), Tongue
patent: 4071782 (1978-01-01), Vidovic
patent: 4140983 (1979-02-01), Tamori
patent: 4200889 (1980-04-01), Strobele
Rundfunktechnische Mitteilungen, vol. 1, 1957 pp. 151-158.
BASF - Aktiengesellschaft
Faber Alan
Konick Bernard
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