Sample-Rate Conversion
by Atlanta Signal Processors, Inc.

Software Overview

Sample-Rate Conversion converts signals digitized at one sampling rate to another rate. Rates of 8 
kHz, 10 kHz, 16 kHz, 20 kHz, 32 kHz, 44.1 kHz, or 48 kHz are supported. The converter algorithm is 
constructed from optimized filters for single and multistage conversions. The decimation and 
interpolation filters have been designed with more than 96 dB of attenuation.
Sample-Rate Conversion is often used in applications that are required to interface between devices 
that have different sampling rates such as digital audio tape (DAT) decks and compact disc (CD) 
players.

Features and Benefits

•	Frequency conversions performed in DSP hardware
•	Phase characteristics of mulitiple channels are identical
•	Linear-phase filters

Processor and System Specifications

•	Program memory: 3 kwords
•	Data memory: 4 kwords
•	CPU loading (dynamic memory): 50% for 48 kHz to 44.1-kHz conversion, single channel

Usage Limitations or Performance Considerations

•	None

Algorithm Verification

•	There are no international standards for this algorithm. However it has been extensively tested.

Availability

•	Written by and available through Atlanta Signal Processors.

Company Background and Contact Information

Atlanta Signal Processors was founded in 1981 by Ronald W. Schafer, Thomas P. Barnwell III, and 
Russell M. Mersereau, three Professors of Electrical Engineering at the Georgia Institute of 
Technology with over 80 years of experience in the field. The company has focused its efforts on 
developing tools for professional signal-processing design engineers and now offers digital 
signal-processing hardware and software products to DSP designers worldwide.
Contact:	Atlanta Signal Processors, Inc.
		1375 Peachtree St. NE, Suite 690
		Atlanta, Georgia  30309-3115
		(404) 892-7265
		Fax: (404) 892-2512
		e-mail: aspi@aspi.com