Multirate Digital Signal Processing, Oversampling of Analog-to-Digital Conversion, and Undersampling of Bandpass Signals - Digital Signal Processing: Fundamentals and Applications - page 555

CHAPTER

12

Multirate Digital Signal Processing,
Oversampling of Analog-to-Digital
Conversion, and Undersampling
of Bandpass Signals

CHAPTER OUTLINE

12.1 Multirate Digital Signal Processing Basics................................................................................... 555
12.1.1 Sampling Rate Reduction by an Integer Factor .........................................................556
12.1.2 Sampling Rate Increase by an Integer Factor ...........................................................562
12.1.3 Changing the Sampling Rate by a Noninteger Factor L/M ..........................................567
12.1.4 Application: CD Audio Player ..................................................................................571
12.1.5 Multistage Decimation ...........................................................................................574
12.2 Polyphase Filter Structure and Implementation............................................................................. 578
12.3 Oversampling of Analog-to-Digital Conversion .............................................................................. 585
12.3.1 Oversampling and Analog-to-Digital Conversion Resolution........................................586
12.3.2 Sigma-Delta Modulation Analog-to-Digital Conversion ...............................................592
12.4 Application Example: CD Player................................................................................................... 601
12.5 Undersampling of Bandpass Signals ............................................................................................ 603
Simulation Example ................................................................................................................... 608
12.6 Sampling Rate Conversion Using the TMS320C6713 DSK ............................................................. 608
12.7 Summary ................................................................................................................................... 613

OBJECTIVES:
This chapter investigates basics of multirate digital signal processing, illustrates how to change a sampling
rate for speech and audio signals, and describes the polyphase implementation for the decimation filter
and interpolation filter. Next, the chapter introduces the advanced analog-to-digital conversion system with
the oversampling technique and sigma-delta modulation. Finally, the chapter explores the principles of
undersampling of bandpass signals.

12.1 MULTIRATE DIGITAL SIGNAL PROCESSING BASICS
In many areas of digital signal processing (DSP) applications d such as communications, speech, and
audio processing d rising or lowering of a sampling rate is required. The principles relating to
changing the sampling rate belong essentially within the topic of multirate signal processing (Ifeachor