Audio codec with agc controlled by a vocoder

H - Electricity – 03 – M

Patent

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Details

H03M 1/18 (2006.01) H03G 3/20 (2006.01)

Patent

CA 2313219

An audio band processor and a method and circuit for controlling its gain. The audio band processor comprises a first variable gain amplifier (202) for receiving an analog audio signal; an analog to digital converter (204) for converting said analog audio signal to a digital audio signal; and an interface circuit (206) for encoding said digital audio signal. The interface circuit (206) also arranges said digital audio signal into a sequence of encoded transmit frames, and receives a sequence of encoded receive frames, each receive frame comprising a predetermined number of encoded digital audio signal data bits and a predetermined number of digital gain control bits. The interface circuit (206) also adjusts a gain level of said first variable gain amplifier in response to said digital gain control bits. In another embodiment, the audio band processor further comprises a second variable gain amplifier (202), and the interface circuit adjusts a gain level of said second variable gain amplifier in response to said digital gain control bits.

L'invention concerne un processeur de bande des basses fréquences, ainsi qu'un procédé et un circuit de commande de son gain. Le processeur de bande des basses fréquences comprend un premier amplificateur à gain variable (202) destiné à recevoir un signal audio analogique; un convertisseur analogique numérique (204) destiné à convertir le signal audio analogique en signal audio numérique; et un circuit d'interface (206) destiné à coder le signal audio numérique. Le circuit d'interface (206) organise également le signal audio numérique en une séquence de trames d'émission codées, et reçoit une séquence de trames de réception codées, chaque trame de réception comprenant un nombre prédéterminé de bits de données de signal audio numérique codés et un nombre prédéterminé de bits de commande de gain numérique. Le circuit d'interface (206) ajuste également un niveau de gain du premier amplificateur à gain variable en réponse aux bits de commande de gain numérique. Dans un autre mode de réalisation, le processeur de bande des basses fréquences comprend également un deuxième amplificateur à gain variable (202) et le circuit d'interface ajuste un niveau de gain de ce deuxième amplificateur à gain variable en réponse à ces bits de commande de gain numérique.

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