Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1991-03-01
1993-06-01
Ng, Jin F.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 2, 455 32, 455 511, 375107, 3701001, H04H 500
Patent
active
052167178
ABSTRACT:
A synchronized broadcast network comprises a main transmitter transmitting an audio source signal to a plurality of receiver/transmitter units remote from each other and from the main transmitter, the receiver/transmitter units broadcasting the audio signal using frequency modulation. In the main transmitter the audio source signal is digitized by sampling it at a predetermined sampling frequency. A digitized signal representing the sampled audio signal is transmitted to the receiver/transmitter units. In each receiver/transmitter unit a reference signal representing the sampling frequency is derived from the received digitized signal and the received digitized signal is passed through a succession of digital processing stages including a stage in which a carrier derived from the reference signal is digitally modulated and a stage in which the result of the digital modulation is digital-to-analog converted. In one of the digital processing stages the received digitized signal is delayed for a predetermined time in order to synchronize the phase of the receiver/transmitter units. All the digital processing stages are synchronized to the reference signal to obtain identical digital modulation of the same carrier for all the receiver/transmitter units. The result of the digital-to-analog conversion stage is transposed to a final frequency derived from the reference signal for broadcasting the analog audio signal using frequency modulation with the same modulation, phase and carrier at all receiver/transmitter units.
REFERENCES:
patent: 4317220 (1982-02-01), Martin
patent: 4608699 (1986-08-01), Batlivala et al.
patent: 4688210 (1987-08-01), Eizenhofer et al.
patent: 4821260 (1989-04-01), Klank et al.
patent: 4972410 (1990-11-01), Cohen et al.
patent: 5038402 (1991-09-01), Robbins
Bourcet Patrice
Komly Alain
Seguin Michel
Lefkowitz Edward
Ng Jin F.
Telediffusion de France
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