Firmware simplifies design for feature-rich desktop phones and home automation systems.

The ZLS38503 firmware supports a range of features, including voice recording and prompting, dual-tone multi-frequency (DTMF) receiver, tone generator, call progress tone detection, and caller ID. The voice messaging and prompting firmware works with the previously released ZL38004 hardware platform and ZLS38502 advanced speakerphone firmware to provide a complete solution. Zarlink’s integrated voice processing firmware provides designers with a 30-40 percent cost-savings compared to using discrete DTMF and caller ID chips.

The ZLS38503 firmware supports voice prompting/messaging and signaling features. Voice prompting asks the user to perform a function, for example to leave a message after the tone, or provides the user with caller ID information. The messaging allows the user to leave a message. The signaling block includes caller ID type 1 detection, DTMF detection, tone generator (including DTMF generation) and call progress tone detection. Alternative solutions would require a number of components to support these features.

An integrated tone generator creates single and dual tones, including pre-programmed DTMF tones. The tone ringer can generate unique ringer tones for an electronic ringer. The integrated DTMF receiver detects tones for pass code entry and message playback on phone systems. In home automation systems, the DTMF receiver can be used to detect keypad tones to control certain applications, for example secure door entry.

Zarlink’s ZLS38502 application-specific firmware is a complete package of noise reduction and echo cancellation algorithms specifically designed to provide high-end voice quality in a wide range of speakerphone-enabled systems. The firmware supports full-duplex operation, and integrates psychoacoustic noise reduction along with acoustic echo cancellation and equalization. The ZL38004 hands-free voice processing hardware platform comprises a voice optimized digital signal processor (DSP), integrated memory and dual high-performance CODECs. Zarlink firmware is loaded onto the hardware platform via either an external flash memory or through a microprocessor microport, making the voice processing platform extremely flexible and able to support customization when required.