Fixed quality source coder

H - Electricity – 03 – M

Patent

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Details

H03M 7/30 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/28 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2186748

A fixed quality source coder (20) receives and performs VQ on an input signal ID. The fixed quality source coder (20) includes an encoder (28) and may also include a decoder (34). The encoder may include a lossy codec (52) that receives and encodes the signal ID to provide encoded information (38) to a multiplexer (30) regarding the signal ID. The lossy codec (52) also decodes the encoded signal to produce a decoded signal IVQ-I (62). A summer (66) receives ID and IVQ-I and determines an error signal ER (70) where ER equals ID - IVQ-I. A threshold circuit (74) receives the signal ER and passes a truncated error signal ET'. The threshold level T may be set to ensure that the maximum error allowed in the encoder (28) is equal to a particular desired maximum error.

Un codeur source de qualité fixe (20) reçoit un signal d'entrée ID et effectue une quantification vectorielle (VQ) sur ce dernier. Le codeur source de qualité fixe (20) comporte un codeur (28) et éventuellement un décodeur (34). Le codeur peut comprendre un codec à pertes (52) qui reçoit et code le signal I¿D? pour fournir à un multiplexeur (30) des informations codées (38) relatives au signal I¿D?. Le codec à pertes (52) décode également le signal codé pour produire un signal décodé I¿VQ??-1¿ (62). Un additionneur (66) reçoit I¿D? et I¿VQ??-1¿ et détermine un signal d'erreur E¿R? (70), E¿R? étant égal à I¿D? - I¿VQ??-1¿.Un circuit à seuil (74) reçoit le signal E¿R? et passe un signal d'erreur tronqué E¿T?. Le niveau de seuil T peut être déterminé pour assurer que l'erreur maximum tolérée dans le codeur (28) est égale à une erreur maximum donnée particulière.

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