G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/14 (2006.01) G10L 19/00 (2006.01)
Patent
CA 2179194
Voice compression is performed in multiple stages (12, 14) to increase the overall compression between the incoming analog voice signal (15) and the resulting digitized voice signal (80) over that which would be obtained if only a single stage of compression were to be used. A first type of compression is performed on a voice signal (15) to produce an intermediate signal (44) that is compressed with respect to the voice signal (15), and a second, different type of compression is performed on the intermediate signal (40) to produce an output signal (42) that is compressed still further. As a result, compression better than 1920 bits per second (and approaching 960 bits per second) are obtained without sacrificing the intelligibility of the subsequently reconstructed analog voice signal (15). Voice compression is also performed by recognizing redundant portions of said voice signal (15), such as silence, and replacing such redundant portions with a special code in said compressed signal (40). Among other advantages, the higher total compression allows speech to be transmitted in far less time than would otherwise be possible, thereby reducing expense.
La compression de la parole s'effectue par étapes multiples (12, 14) de manière à augmenter la compression globale entre le signal vocal analogique (80) entrant et le signal vocal numérisé obtenu par rapport au résultat obtenu en seulement une étape de compression. Un premier type de compression s'effectue sur un signal vocal (15) de manière à produire un signal intermédiaire (44) comprimé par rapport au signal vocal (15), et un deuxième type de compression différent s'effectue sur le signal intermédiaire (40) de manière à produire un signal de sortie (42) encore plus comprimé. On obtient ainsi une compression supérieure à 1920 bits par seconde (et approchant 960 bits par seconde) sans sacrifier l'intelligibilité du signal vocal analogique (15) reconstruit par la suite. La compression de la parole s'effectue également par reconnaissance des parties redondantes dudit signal vocal (15) telles que les silences et par remplacement de ces dernières par un code spécial dans ledit signal comprimé (40). La compression totale supérieure permet, entre autres avantages, de transmettre les signaux vocaux en nettement moins de temps qu'il ne serait autrement possible, ce qui permet de réduire les coûts.
Smart & Biggar
Voice Compression Technologies Inc.
LandOfFree
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