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Ministerul Educaiei al Republicii Moldova

Universitatea Tehnic a Moldovei

Facultatea Inginerie i Management n Electronic

CICLUL II Masterat n cercetare

Raport

DSP of Analog Devices. Applications of Blackfin Processors in Audio

A eectuat!

"t# gr# "$E%&'& (ruteanu )#

A veriicat!

$on# univ# (er*u +#

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$hiinu ,-&'

Table o $ontents

aport..................................................................................................................................................!

!.! DSP of analog devices..................................................................................................................."

!.# Signal sa$pling ............................................................................................................................%

!." DSP do$ains ................................................................................................................................%

!.".! &i$e and space do$ains............................................................................................................%

!.".# 're(uenc) do$ain......................................................................................................................*

!."." +,plane anal)sis..........................................................................................................................-

!.".% avelet.......................................................................................................................................-

!.".* Applications ............................................................................................................................../

!.% Blackfin processors......................................................................................................................./!.%.! Me$or) and DMA.............................................................................................................0

!.%.# Microcontroller features.....................................................................................................1

Media,processing features. &2e Blackfin instruction set contains $edia,processing e3tensions

to 2elp accelerate pi3el,processing operations co$$onl) used in video

co$pression and i$age co$pression and deco$pression algorit2$s4 also used in audio

processing..................................................................................................................................!5

#. Applications of Blackfin Processors in Audio ............................................................................!5

#.! Application of ADAU !/0! Lo6 7oise Stereo Codec 6it2 Sig$aDSP Processing Core... ... .!5

#.# Application of AD!0*# audio pla)8ack s)ste$........................................................................!#

#." Application of SSM#05% Audio Su8s)ste$ 6it2 Class,D Speaker and Capless 9eadp2one

Driver................................................................................................................................................!%#.% Application of Sig$aDSP Stereo Audio Codec ADAU !%-! processor...................................!/

Conclusion:........................................................................................................................................!1

.......................................................................................................................

Mod.

Coala document. Semnat. Data

Coala

#

SCE 525.1 131 03 MEElaborat. Pruteanu S.

Controlat Perju V.

Contr.STAS

.Aprobat

DSP of analog devices.

Applications of Blackfin

Processors in Audio

!t. Col!

!1

UTM FIMET, gr. SCE-131

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1.1 DSP of analog devices

.igital signal processing;."(< is t2e $at2e$atical $anipulation of an infor$ation signal

to $odif) or i$prove it in so$e 6a). It is c2aracteri=ed 8) t2e representation of discrete ti$e4

discrete fre(uenc)4 or ot2er discrete do$ainsignals8) a se(uence of nu$8ers or s)$8ols and t2e

processing of t2ese signals.

&2e goal of DSP is usuall) to $easure4 filter and>or co$press continuous real,6orld analogsignals. &2e first step is usuall) to convert t2e signal fro$ an analog to a digital for$4

8) sa$plingand t2en digiti=ing it using an analog,to,digital converter;ADC

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1.2 Signal sampling

it2 t2e increasing use of co$puters t2e usage of and need for digital signal processing 2as

increased. &o use an analog signal on a co$puter4 it $ust 8e digiti=ed 6it2 an analog,to,digital

converter. Sa$pling is usuall) carried out in t6o stages4discreti=ationand(uanti=ation. In t2e

discreti=ation stage4 t2e space of signals is partitioned intoe(uivalence classesand (uanti=ation is

carried out 8) replacing t2e signal 6it2 representative signal of t2e corresponding e(uivalence

class. In t2e (uanti=ation stage t2e representative signal values are appro3i$ated 8) values fro$ a

finite set.

&2e7)(uistS2annon sa$pling t2eore$states t2at a signal can 8e e3actl) reconstructed fro$ its

sa$ples if t2e sa$pling fre(uenc)is greater t2an t6ice t2e 2ig2est fre(uenc) of t2e signal 8ut

re(uires an infinite nu$8er of sa$ples. In practice4 t2e sa$pling fre(uenc) is often significantl)

$ore t2an t6ice t2at re(uired 8) t2e signals li$ited 8and6idt2.

So$e ;continuous,ti$e< periodic signals 8eco$e non,periodic after sa$pling4 and so$e non,

periodic signals 8eco$e periodic after sa$pling. In general4 for a periodic signal 6it2 period Tto

8e periodic ;6it2 periodN< after sa$pling 6it2 sa$pling intervalTs4 t2e follo6ing $ust 8e

satisfied:

;!.!< ;!.!