Patent ID: 6456719
Filing Date: 2002-09-24
Classification: G10L,H04B

Abstract:
An apparatus for concealment of errors in an input stream of compressed audio data, which comprises:a packet-unit controller, coupled to receive the compressed audio data, for performing an error-checking and decompression operation on the compressed audio data; a threshold controller, coupled to said packet-unit controller, capable of generating a threshold control signal in response to the result of the error-checking operation performed by said packet-unit controller; a scale detector, coupled to receive the input compressed audio data and the output threshold control signal from said threshold controller, capable of performing a scale checking operation to check the packet length of the received compressed audio data and also to check whether any pair of successive scales in the received compressed audio data is incorrect to thereby generate and transfer a scale error signal to said packet-unit controller and an error-correction circuit; and said error-correction circuit, coupled to said scale detector and said packet-unit controller, capable of performing an error concealment operation on the output decompressed audio data from said packet-unit controller based on the value of the scale error signal from said scale detector so as to discard the erroneous decompressed audio data and then output a corrected version of the discarded data.