Audio processor for Ambarella-based IP camera and wearable applications
The audio processor is designed with AcuEdge™ Acoustic Technology on the company’s Timberwolf digital signal processor (DSP) platform, which features a set of complex, fully integrated algorithms that allow users to extract intelligible information from the audio environment in which they are communicating.
Designated ZL38AMB, the IP camera far field audio processor provides license-free, royalty-free intelligent audio algorithms. The comprehensive AcuEdge package accelerates customers’ time-to-market with a complementary reference design and easy-to-use development tools such as the MiTuner™ acoustic echo cancellation (AEC) tuning kit.
The ZL38AMB device is an advanced wideband acoustic echo canceller designed to provide leading-edge echo cancellation, noise reduction, beam forming and sound location detection for the increasingly demanding IP camera and wearable markets. The capabilities of the device boast important advancements to meet growing demand in this space.
According to the latest research from IHS, the IP camera and wearable imaging market reached combined shipments of 21.6 million units during 2014, and are expected to see continued growth in shipments of 30 percent per year over the next four years, climbing to over 91 million units shipped annually by 2018.
The ZL38AMB acoustic echo canceller is a highly adaptable hardware platform designed to enable intelligent audio processing for camera applications. It provides a powerful DSP with voice specific hardware accelerators, three digital microphone interfaces, two independent 16-bit DACs with headphone drivers and two flexible time-division multiplexing (TDM) interfaces in a single 64-pin QFN or 56-pin 3×3 CSP package. Additional features include 48 kHz stereo music playback with voice, ultra-low and standby power. It can run unattended (controller-less) and offers self-booting into a configured operational state.
AcuEdge acoustic technology is the compilation of various voice processing blocks to offer the following:
- Acoustic echo cancellation;
- Stationary and psychoacoustic noise reduction;
- Howling detection and rejection;
- Two and three microphone beam forming;
- Sound location detection;
- Compressor/limiter/expander that offers superior performance for both far-field microphone and automatic gain control (AGC) functionality;
- These powerful capabilities are the foundation for enterprise level automatic speech recognition, sound classification and other intelligent decision making functions based on sound and audio detection.
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