CVSD
16 kbps
by Atlanta Signal Processors, Inc.

Software Overview

CVSD (continuously-varying-slope delta modulation) is a voice-coding algorithm used extensively in 
tactical communications. Although the speech quality is average, the implementation of the 
algorithm is simple, allowing for minimal system requirements.

Features and Benefits

•	Very-low computational requirements
•	Decoder includes efficient digital low-pass filter

Processor and System Specifications

•	Program memory: 490 words
•	Data memory: 215 words (excluding I/O buffers)
•	CPU loading (dynamic memory):
Encoder: 11%
Decoder: 6% (excluding low-pass filter)
Filter: 4%
•	Sample rate: 16 kHz

Usage Limitations or Performance Considerations

•	The buffer size, in samples, must be an integer multiple of 32.

Algorithm Verification

•	Pending

Availability

•	Written by and available from 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