To develop and test functions for audio and mobile telecommunication applications, such as voice dialling, speech coders and audio coders (e.g. MP3), Ensigma have produced a stand-alone audio board based on the Hitachi SH3-DSP RISC processor. The SH3 is commonly used in Windows CE based applications, and the SH3-DSP is a logical extension to enable real-time audio and speech processing on portable devices. Ensigma have previous design experience of the SH series having designed an ASIC DAB receiver and an audio board for GSM handset testing.
The audio board’s key feature is its flexibility whilst being user friendly. Key components of the board include high-quality audio input and output, large SRAM, flash, PLD, multiple I/O formats (serial, parallel and digital) and access to the internal I/O on the 133 MHz SH-DSP.
A prime example of the use of the board is the demonstration of the Ensigma Voice Dial in real environments on a processor targeted at mobile applications. By downloading the software into flash, after development on the PC, the board can operate in a stand-alone mode. With the attachment of a keypad and LCD display it can easily be taken into a typical mobile environment for ‘live’ tests.
Designed by the hardware team at Ensigma, with input from the DSP application engineers, the board provides a powerful tool for the testing, evaluation and demonstration of audio and speech algorithms.