TAILIEUCHUNG - Digital Signal Processing An “A” to “Z”

Speech signals have a very wide dynamic range: Harsh “oh” and “b” type sounds have a large amplitude, whereas softer sounds such as “sh” have small amplitudes. If a uniform quantization scheme were used then although the loud sounds would be represented adequately the quieter sounds may fall below the threshold of the LSB and therefore be quantized to zero and the information lost. Therefore non-linear quantizers are used such that the quantization level at low input levels is much smaller than for higher level signals. To some extent this also exploits the logarithmic nature of human hearing | 1 A DSP A-Z http Digital Signal Processing An A to Z . Stewart Signal Processing Division Dept. of Electronic and Electrical Eng. University of Strathclyde Glasgow G1 1xW UK Tel 44 0 141 548 2396 Fax 44 0 141 552 2487 E-mail . Hoffman Department of Electrical Eng. 209N Walter Scott Eng. Center PO Box 880511 Lincoln NE 68588 0511 USA Tel 1 402 472 1979 Fax 1 402 472 4732 Email hoffman@unlinfo. unl. edu BlueBox Multimedia . Stewart 1998 2 The DSPedia DSPedia An A-Z of Digital Signal Processing This text aims to present relevant accurate and readable definitions of common and not so common terms algorithms techniques and information related to DSP technology and applications. It is hoped that the information presented will complement the formal teachings of the many excellent DSP textbooks available and bridge the gaps that often exist between advanced DSP texts and introductory DSP. While some of the entries are particularly detailed most often in cases where the concept application or term is particularly important in DSP you will find that other terms are short and perhaps even dismissive when it is considered that the term is not directly relevant to DSP or would not benefit from an extensive description. There are 4 key sections to the text DSP terms A-Z page 1 Common Numbers associated with DSP page 427 Acronyms page 435 References page 443 Any comment on this text is welcome and the authors can be emailed at or hoffman@. Bob Stewart Mike Hoffman 1998 Published by BlueBox Multimedia. A-series Recommendations 1 A A-series Recommendations Recommendations from the International Telecommunication Union ITU telecommunications committee ITU-T outlining the work of the committee. See also International Telecommunication Union ITU-T Recommendations. A-law Compander A defined standard nonlinear logarithmic in fact quantiser characteristic useful for certain signals. Non-linear .

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