Patent ID: 7653448
Filing Date: 2010-01-26
Classification: H04N

Abstract:
1. A NICAM processing method comprising: receiving and temporarily storing a current frame of A-channel and B-channel input data into a first memory at a first clock rate; reading companded A-channel and B-channel data of a previous frame from a second memory at a second clock rate and in a manner for interleaving the previous frame companded A-channel and B-channel data into the NICAM standard required interleaved format, the companded A-channel and B-channel data of the previous frame having been temporarily stored during a previous frame into the second memory in a format other than an interleaved format according to NICAM standard requirements, wherein the second memory includes a first RAM and a second RAM, and wherein the format other than the interleaved format according to the NICAM standards comprises a dual word pre-interleaved format, and wherein each dual word of the dual word pre-interleaved format comprises 22-bits of a companded A-channel word and a companded B-channel word pair, and wherein each dual word is stored in one of the first RAM or the second RAM, and wherein the reading the companded A-channel and B-channel data of the previous frame from the second memory comprises: companding the A-channel and B-channel input data of the current frame and storing the companded A-channel and B-channel input data of the current frame into the second memory and in the format other than the interleaved format, wherein the companding and storing are performed at a third clock rate during an interval within the current frame that occurs subsequent to both the storing into the first memory and the reading from the second memory.