US 5,606,618 A · Subband coded digital transmission system using some composite signals

Abstract

Reproduction accuracy of, for example a digital stereo audio signal, is improved by transmitting sample data as sub-signals such as frequency subband signals. In one or more subbands, corresponding components such as left and right stereo channels are combined so that only one composite signal is transmitted per subband. An indicator signal is transmitted, indicating which subbands are combined. Scale factor signals for all subbands, and for the relative intensity of the respective subband signals which were combined, may also be transmitted. In the receiver a subband signal is derived for each channel from the composite signal, before synthesis of the full channel signals which will be reproduced.

Claims6

Dependent claims

An encoder for encoding a plurality of input signals, comprising

steering means responsive to said plurality of input signals for generating at least one individual signal and a composite signal, said composite signal having a frequency spectrum in one frequency band, and said at least one individual signal having at least one respective frequency spectrum in a plurality of frequency bands excluding said one frequency band, said plurality of frequency bands respectively representing a corresponding one of said plurality of input signals within the plurality of frequency bands, and
control means responsive to said steering means for generating a steering control signal having at least one component relating to said frequency band of said composite signal.

Dependencies are inferred from the claim text.

Facts

Application

08/173,850Filed 27 Dec 1993 · continuation

Priority

NL 89014022 Jun 1989

Granted

25 Feb 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification33 codes

H04H 20/88
Arrangements characterised by the broadcast information itself: stereophonic broadcast systems
G10L 19/008
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/0208
Using subband decomposition: subband vocoders
G11B 20/00007
Signal processing not specific to the method of recording or reproducing; Circuits therefor: time or data compression or expansion

Subband coded digital transmission system using some composite signals

Life of this patent

Subband coded digital transmission system using some composite signals

Life of this patent

Abstract

Claims6