AK7719: New Micro-Power DSP for Both Hands-Free Voice Communications and Digital Audio Processing
AKM's proprietary royalty-free algorithms for voice communications, including a two-microphone noise suppressor and echo canceller, enable highly audible phone calls with minimal noise. Clarity enhancement and bandwidth expansion algorithms that improve both voice transmission and reception are available for porting to the AK7719. Supporting wide-band signal processing, the AK7719 can be applied to VoIP applications. Additional functions other than those for voice calls, such as digital audio processing for music playback and microphone zooming that synchronizes a camera zoom for video recordings are also available. The AK7719 is capable of processing full-bandwidth digital audio (48kHz) or voice communications at 8kHz or 16kHz.
Programs are loaded into internal RAM via a serial interface from a microcontroller, allowing for seamless updates. For connecting to other audio devices including baseband processors, ACPU and Bluetooth modules, the serial voice interface supports MSB-first, LSB-first, I²S and PCM audio data formats. A power management function operated by clock inputs is an advantage for power saving. In narrowband hands-free voice processing mode, the AK7719 dissipates just 7.5mW, realizing long battery life for mobile phone applications.
The AK7719 is housed in a very small 25-pin CSP package (2.62mm x 2.93mm, 0.5mm pitch). It operates off of 1.8V and 1.2V power supplies.