Patent ID: 6807278
Filing Date: 2004-10-19
Classification: G11B,H03G,H04B

Abstract:
In an audio-frequency electronic noise reduction system, a decoder implemented by means of digital signal processing, said decoder receiving as input an encoded signal encoded in accordance with a signal compression noise reduction scheme and producing as output a decoded signal, said decoder comprising:a direct feed-forward signal path having a filter block having at least one digital linear filter, each said linear filter having a transfer function having a plurality of parameters; said filter block being driven by said encoded signal and producing as an output said decoded signal; and at least one feedback signal path having a control block for receiving said decoded signal and determining by means of digital signal processing said parameters of at least one of said linear filters as a function of said decoded signal; wherein said decoded signal approximates the signal which an analog Dolby A noise reduction system decoder would produce as output if it received said encoded signal as input.