Method and apparatus for creating a composite waveform

H - Electricity – 04 – L

Patent

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H04L 1/00 (2006.01) H04L 5/12 (2006.01) H04J 13/04 (2006.01) H04B 1/707 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2153685

A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals (201). Subsequently, the plurality of coded input digital information signals (231, 235, 237) are communicated over a communication medium (103) to a digital combiner 9105). The digital combiner (105) combines the plurality of coded input digital information signals. Finally, the digitally combined information signal is spectrally shaped to form a composite waveform (107). These composite waveform creation principals may be applied to digitally encoded voice subbands in a subband coding system as well as channel information in a direct sequence code division multiple access (DS-CDMA) communication system transmitter.

Procédé et appareil permettant de créer une forme d'onde composite. On crée cette forme d'onde composite en codant une pluralité de signaux d'information d'entrée numériques (201). Ladite pluralité de signaux d'information d'entrée numériques codés (231, 235, 237) sont transmis à un combineur numérique (105) par l'intermédiaire d'un support de communication (103). Ce combineur numérique (105) combine la pluralité de signaux d'information d'entrée numériques codés. Enfin, la forme du spectre du signal d'information combiné de manière numérique permet d'obtenir une forme d'onde composite (107). Ces principes de création de forme d'onde composite peuvent être appliqués aux sous-bandes vocales à codage numérique dans un système de codage de sous-bande ainsi que les informations de voie dans un émetteur de système de communication à accès multiple par différence de code à séquence directe (DS-AMDC).

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