发明名称 |
MULTI-PRECISION TECHNIQUE FOR DIGITAL AUDIO ENCODER |
摘要 |
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. Commercial AC-3 Encoders have been successfully implemented on 20-bit and 24-bit word-length processors. However, 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 utilised 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.
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申请公布号 |
WO0025249(A1) |
申请公布日期 |
2000.05.04 |
申请号 |
WO1998SG00084 |
申请日期 |
1998.10.26 |
申请人 |
STMICROELECTRONICS ASIA PACIFIC PTE LTD.;ABSAR, MOHAMMED, JAVED;GEORGE, SAPNA;ALVAREZ-TINOCO, ANTONIO, MARIO |
发明人 |
ABSAR, MOHAMMED, JAVED;GEORGE, SAPNA;ALVAREZ-TINOCO, ANTONIO, MARIO |
分类号 |
G10L19/02;G10L19/14;G10L19/16;(IPC1-7):G06F19/00 |
主分类号 |
G10L19/02 |
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