Simultaneous transmission of ancillary and audio signals by...

H - Electricity – 04 – H

Patent

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H04H 9/00 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2242725

A communication system for simulataneously transmitting ancillary codes and audio signals via a conventional audio communications channel using perceptual coding techniques is disclosed. An encoder monitors an audio channel to detect "opportunities" to insert an ancillary code such that the inserted signals are masked by the audio signal, as defined by the "perceptual entropy envelope" of the audio signal. An ancillary code containing, for example, an ID or serial number, is encoded as one or more whitened spread stpectrum signals and/or a narrowband FSK ancillary code and transmitted at a time, frequency and/or level such that the data signal is masked by the audio signal. A decoder at a receiving location recovers the encoded ID or serial number.

L'invention concerne un système de transmission permettant de transmettre simultanément des codes auxiliaires et des signaux audio via un canal de communication audio classique à l'aide de techniques de codage perceptif. Un codeur contrôle un canal audio pour détecter les "opportunités" d'insérer un code auxiliaire de telle sorte que les signaux insérés sont masqués par le signal audio, comme cela est défini par "l'enveloppe entropique perceptive" du signal audio. Un code auxiliaire contenant, par exemple, un numéro d'identification ou de série, est codé sous forme d'un signal ou de plusieurs signaux à spectre étalé blanchi et/ou d'un code auxiliaire à transmission par déplacement de fréquence à bande étroite et est transmis à un moment, une fréquence et/ou un niveau tels que le signal de données est masqué par le signal audio. Un décodeur situé à un emplacement de réception récupère le numéro d'identification ou de série codé.

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