World’s first high-dynamic-range audio processor

Without requiring expensive, high-performance ADCs, the HDR signal acquisition technology enables digital signals with a dynamic range exceeding 130dB to be generated. Using this patent pending technique, the STA311B can process sounds as low as a whisper or as high as jet engine noise with the same degree of clarity, delivering an unprecedented audio quality.

Eight audio-processing channels are embedded with up to 10 independent user-selectable biquadratic filters per channel. The STA311B also features input and output mixing capabilities, multi-band dynamic range compression, advanced pop-free operation, auto-detection of input sampling frequency, input and output (pre- and post-processing) RMS (Root Mean Square) metering and ST’s proprietary FFXTM Pulse Width Modulation technology.

The RMS metering increases safety without any additional hardware cost, the application can suppress unwanted energy surges that could potentially damage the speakers. In both Single-End and Bridge-Tied Load configurations, the device's pop-free circuitry enables a seamless start-up, eliminating unwanted noise due to the bridge charge sequence.

This highly integrated device allows audio equipment and subsystem manufacturers to develop multiple products based on the same design. Still tailored for a variety of price/performance scenarios, this enables costs to be reduced.

Supplied in a compact 8.0x8.0x0.9mm VFQFPN package, the STA311B audio processor is available now for sampling in volume for $3.00 each in 1,000 unit quantities.