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R2 Transmit Software for Texas TMS320C54x/C55x DSPs

This software generates dual-tone signals to ITU Q.441 R2 signalling format. R2 transmission is done by choosing tone-pair combinations from the following two 6-tone groups:

FORWARD DIRECTION: 1380/1500/1620/1740/1860/1980Hz

BACKWARD DIRECTION: 1140/1020/ 900/ 780/ 660/ 540Hz

The composite tone signal can send one of 15 digits (6C2 = 15) in each direction according to the digit code set.

The software is in the form of three callable subroutines: one sets common-channel default parameters, one initialises per-channel memory, and one is for per-sample tone-pair generation from the digit supplied at routine entry. Sample rates of 8.0kHz or 9.6kHz can be set. The transmit power is made user-programmable.

The software can be operated in a multi-channel mode: a pointer is set to each per-channel block of memory at each sub-routine call. By making multiple sub-routine calls, the code can also be operated on blocks of samples.

Specification: the values Pt is user-programmable

• Per-tone power: Pt where Pt =< -3dBm (full-scale = +6dBm)

• Tone accuracy: <0.06Hz error

DSP Load:

• MIPS: 0.19 - 8.0kHz sampling ; 0.23 - 9.6kHz sampling

• Data memory: 1(common)+7(per channel) words

• Program memory: 0.11k words

Availability: NOW, with user's guide - integration support can be provided