Methods and apparatus for encoding and decoding data...

Details Methods and apparatus for encoding and decoding data... Methods and apparatus for encoding and decoding data...

H - Electricity

04

M

H04M 11/06 (2006.01)

Patent

CA 2201758

A method of generation and detection of acoustic signals carrying alpha- numeric data for reducing the effects of noise and thereby improving signal transmission without the need to boost the power of the signal. In accordance with one aspect of the invention, a special DTMF acoustic signal consisting of a combination of two frequencies will be generated for the representation of a particular alpha-numeric character that will be similar to the standard DTMF tone. The difference between the amplitudes of both frequencies varies during the time of generation of the DTMF tone in such a way that both signals will arrive at a final destination detector, i.e., an interactive voice response board, at least for a portion of the generation time, at a relatively similar amplitude, thereby substantially increasing the probabilities of being recognized as a DTMF signal.

Procédé de génération et de détection de signaux acoustiques portant des données alphanumériques, destiné à limiter les effets du bruit et, de ce fait, à améliorer la transmission de signaux, sans qu'il soit nécessaire d'amplifier la puissance du signal. Selon un aspect de l'invention, un signal acoustique spécial de multifréquence en code 2 (DTMF) consistant en une combinaison de deux fréquences est généré, pour la représentation d'un caractère alphanumérique particulier, qui est semblable à la tonalité DTMF standard. La différence entre les amplitudes des deux fréquences varie pendant la période de génération de la tonalité DTMF, de telle manière que les deux signaux atteignent un détecteur de destination finale, à savoir, un panneau de réponse vocale interactif, au moins pendant une partie de la période de génération, à une amplitude relativement similaire, ce qui augmente sensiblement les probabilités qu'ils soient reconnus en tant que signal DTMF.

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