Unit v Applications Cs2403 Dsp (1)

8/10/2019 Unit v Applications Cs2403 Dsp (1)

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[CS2403 Digital Signal Processing] D NNY RDX

UNIT V APPLICATIONS

Multirate signal processing – Speech compression – Adaptive filter – Musical sound processing –

Image enhancement.




Statement of the problem




Definition




Speech signals

From prehistory to the new media of the future, speech has been and will be a primary form

of communication between humans.

Nevertheless, there often occur conditions under which we measure and then transform the

speech to another form, speech signal, in order to enhance our ability to communicate.

The speech signal is extended, through technological media such as telephony, movies, radio,

television, and now Internet. This trend reflects the primacy of speech communication in human

psychology.

“Speech will become the next major trend in the personal computer market in the near

future.”

Speech signal processing

The topic of speech signal processing can be loosely defined as the manipulation of sampled

speech signals by a digital processor to obtain a new signal with some desired properties.

Speech signal processing is a diverse field that relies on knowledge of language at the levels of

Signal processing Acoustics

Phonetics

Language-independent Phonology Morphology

Syntax

Language-dependent Semantics

Pragmatics

7 layers for describing speech

From Speech to Speech Signal, in terms of Digital Signal Processing




It is based on the fact that

– Most of energy between 20 Hz to about 7KHz ,

– Human ear sensitive to energy between 50 Hz and 4KHz

In terms of acoustic or perceptual, above features are considered.

From Speech to Speech Signal, in terms of Phonetics (Speech production), the digital model

of Speech Signal will be discussed

Motivation of converting speech to digital signals:




Multirate signal processing

Unit v Applications Cs2403 Dsp (1)

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