Tone Generation
by D2 Technologies, Inc.

Software Overview

D2's Tone Generation voice processing algorithm module generates both call progress tones and DTMF 
digits. The call progress algorithm generates dial, busy, reorder, and ringback tones. The DTMF 
algorithm generates all 16 DTMF digits. The output power of high and low frequencies can be set 
within a range through system configurable parameters, and the make time and break time can be 
specified in 8- msec units.
Designed to the VP Open interface, the Tone Generation 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, Tone Generation consists of robust 
software that is rigorously tested.

Features and Benefits

•	Generates dial, ringback, busy, and reorder tones and all 16 DTMF digits
•	High and low frequency power levels, and make and break time (in 8-msec units) set through system 
configurable parameters
•	Meets or exceeds EIA 464 requirements for call progress and DTMF tone generators
•	Additional tones can be added

Processor and System Specifications

•	Devices supported: TMS320C2xx, TMS320C3x, TMS320C5x
•	Processor resources required:
•	Algorithm category: Telecommunications
TMS320C2xx (Est.)
TMS320C3x (Est.)
TMS320C5x
Program memory
550 words
450 words
518 words
Data memory/port
20 words
20 words
20 words
Processor loading
worst case
0.35 MIPS
0.3 MIPS
0.3 MIPS

Usage Limitations or Performance Considerations

•	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 Tone Generation algorithm module is validated through the following suite of tests:
•	D2's Tone Generation tests, which test tone frequency, duration, and power
•	VP Open interface validation – the Tone Generation 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 also available for the TI EVM50 
DSP board. Implementation for the TMS320C2xx and the TMS320C3x will be available 2Q 1996.

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