Dial Pulse or 
Click Detection
by D2 Technologies, Inc.

Software Overview

D2's Dial Pulse or Click Detection voice processing algorithm module detects clicks made by pulse 
dialing under a broad range of network conditions and under international telecommunications 
specifications.
Designed to the VP Open interface, the Dial Pulse or Click Detection module easily integrates with 
other VP Open modules, runs in real-time concurrently with other VP Open modules, and handles any 
number of voice ports assigned to the DSP.  Like all of D2's algorithm modules, Dial Pulse or Click 
Detection consists of robust software that is rigorously tested.

Features and Benefits

•	Detects clicks made by pulse dialing in the absence of voice
•	Accepts telephone band codec or linear data

Processor and System Specifications

•	Devices supported: TMS320C5x
•	Processor resource required:
•	Algorithm category: Telecommunications
TMS320C5x
Program memory
1.1 kwords
Data memory/voice port
204 words
Processor loading
Worst case: 0.9 MIP

Usage Limitations or Performance Considerations

•	The VP Open architecture places minimal constraints on the underlying hardware and can 
accommodate a wide variety of systems. The host, voice data input and output, memory allocation, 
and module to module communication interfaces must conform to VP Open as described in the VP Open 
Software Interface Specification.

Algorithm Verification

D2's Dial Pulse or Click Detection algorithm module is validated through the following suite of 
tests:
•	D2 pulse detection test from a prerecorded tape containing samples from different types of  
telephones
•	D2 pulse detection test with live data from different telephone sets
•	VP Open interface validation – the Dial Pulse or Click Detection module is integrated with other 
VP Open modules and tested concurrently in real-time on the D2 VDS50 system for multiple voice 
ports

Availability

Currently available for the TMS320C5x. A demonstration package is available for the Texas 
Instruments EVM50 DSP board.

Company Background and Contact Information

D2 Technologies, Inc. was founded by David Y. Wong and David M. Lindsay to help companies innovate 
telecommunications and information products with voice processing technology, which include 
telephony and voice algorithms, real-time system software, and development services.
With over 20 years of experience in voice processing algorithms, real-time DSP implementation, 
real-time systems, telephone systems, and voice processing applications, D2's business model is to 
develop close partnerships with its customers via high levels of service and special engineering to 
ensure mutual success.

Contact:	D2 Technologies, Inc.
		Attn:  Product Sales
		104 West Anapamu Street
		Suite J
		Santa Barbara,  CA 93101
		(805) 564-3424
		Fax:  (805) 966-2144
		e-mail:  sales@d2tech.com