Circuit arrangement for demmodulating the sound signals in a tel

Details Circuit arrangement for demmodulating the sound signals in a tel Circuit arrangement for demmodulating the sound signals in a tel

1994-05-05

1996-01-09

Groody, James J.

Television

Receiver circuitry

Sound circuit

348736, 348480, 348482, 348484, H04N 560, H04N 544, H04N 708, H04N 7093

Patent

active

054832985

ABSTRACT:
A circuit arrangement for demodulating the sound signals in a television signal is described, which circuit arrangement ensures a simple and low-cost structure, also for operation at different transmission standards.
To this end, the circuit arrangement according to the invention includes an oscillation-generating stage which derives a (first) oscillation from a television signal (IF television signal) modulated on a first intermediate-frequency carrier oscillation, whose frequency corresponds to the frequency of an intermediate-frequency picture carrier oscillation in the IF television signal and encloses a phase angle of at least substantially 90.degree. with the picture carrier oscillation, a (first) mixer stage, a first input of which can receive the (first) oscillation, and a switching device for optionally applying the IF television signal or a sound signal (IF sound signal) modulated on a second intermediate-frequency carrier oscillation to a second input of the (first) mixer stage.

REFERENCES:
patent: 4511924 (1985-04-01), Griffis et al.
patent: 4562472 (1985-12-01), Carlson
M. McGinn, "An advanced I.F. amplifier and AFT system suitable for HDTV", IEEE Transactions on Consumer Electronics, vol. 36, No. 3, Aug. 1990, pp. 407-413.
U. Buhse, "The german 2-carrier-system for trrestrial TV-sound transmission systems and integrated circuits for `high-quality` TV-receivers", IEEE Transactions on Consumer Electronics, vol. 28, No. 4, Nov. 1982, pp. 489-503.

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