公开(公告)号：EP1125235A1

公开(公告)日：2001-08-22

申请号：EP98951905.3

申请日：1998-10-26

Applicant: STMicroelectronics Pte Ltd.

Inventor： ABSAR, Mohammed, Javed ,  GEORGE, Sapna ,  ALVAREZ-TINOCO, Antonio, Mario

IPC: G06F19/00

CPC classification number: G10L19/0212 ,  G10L19/16

Abstract: AC-3 is a high quality audio compression format widely used in feature films and, more recently, on Digital Versatile Disks (DVD). For consumer applications the algorithm is usually coded into the firmware of a DSP Processor, which due to cost considerations may be capable of only fixed point arithmetic. It is generally assumed that 16-bit processing is incapable of delivering the high fidelity audio, expected from the AC-3 technology. Double precision computation can be utilized on such processors to provide the high quality; but the computational burden of such implementation will be beyond the capacity of the processor to enable real-time operation. Through extensive simulation study of a high quality AC-3 encoder implementation, a multi-precision technique for each processing block is presented whereby the quality of the encoder on a 16-bit processor matches the single precision 24-bit implementation very closely without excessive additional computational complexity.