Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1991-12-12
1993-06-15
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 7, 328 14, 307264, 307268, 307358, H04H 500
Patent
active
052206076
ABSTRACT:
In stereo receivers with digital decoding pulse generation, interference by the harmonics of the digital switching signal with signals in adjacent channels or with carrier signals in the sideband lead to faults that can be perceived in the audible range as chirping. An integrated stereo decoder with digital decoding pulse generation is described in which the low-harmonic, step-like switching signal consecutively assumes within a period and relative to the amplitude the values (1+.sqroot.2).sup.-1, 1, (1+.sqroot.2).sup.-1, -(1+.sqroot.2).sup.-1, -1, -(1+.sqroot.2).sup.-1, with the .+-.(1+.sqroot.2).sup.-1 values each persisting for an eighth of the period and the .+-.1 values a quarter of the period. Furthermore, an integrated circuit array for generation of this low-harmonic oscillation is described. The circuit array comprises a two-stage dual frequency divider stage and a differential amplifier, where a rectangular signal is supplied to the differential amplifier input and the current is modulated by the differential amplifier by using a second rectangular signal with double the frequency. The low-harmonic switching signal can be picked up at the output of the differential amplifier.
REFERENCES:
patent: 3721766 (1973-03-01), Hilbert
patent: 3801807 (1974-04-01), Condon
patent: 4069398 (1978-01-01), Fujie
patent: 4433433 (1984-02-01), Ogawa et al.
patent: 4506376 (1985-03-01), Noguchi
patent: 4680792 (1987-07-01), Tanaka et al.
patent: 4845436 (1989-07-01), Kobayashi et al.
Journal of the Audio Engineering Society, Bd. 33, Nr. 9 Sep. 1985, N.Y. , US, Seiten 669-673, Takahashi et al. "Application of Walsh Functions to an FM Stereo Demodulator".
Lancaster, CMOS Cookbook, 1979, pp. 325-331.
Isen Forester W.
Telefunken electronic GmbH
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