SignalMaster—An open hardware and software system for speech and signal processing

A portable speech and signal processing system was developed using a TMS320C6748 Digital Signal Processor (DSP) with two input and output channels with 32 bit Analog-to-Digital (AD) and Digital-to-Analog (DA) converters. Lithium-ion batteries provide up to 10 hours of freestanding operation. The system may also be used while connected to a personal computer (PC). Special boot loading code and an interface protocol was developed in order to allow communications and standardize the transfer of instructions and data between the DSP hardware and PC through a Universal Serial Bus (USB) interface cable. In addition, a PC-based user application interface high-level language dynamic link library was also developed to enable development of a wide range of applications. The library provides functions for user developed applications to communicate with the hardware and be able to upload C language programs into the DSP system. This allows for different programs to be uploaded in order to reconfigure the processing a...