STMicroelectronics' STA321 4-Channel Digital Audio System is a single chip solution for digital audio processing applications. The STA321 4-Channel Digital Audio System is part of the Sound Terminal™ family that together with the digital power stage provides full digital audio streaming to the speaker, offering cost effectiveness, low energy dissipation and sound enrichment. STMicroelectronics' STA321 4-Channel Digital Audio System input section consists of two multiplexed stereo analog inputs, a 16-bit ADC and two independent digital input interfaces. There is also a digital output interface fed by the ADC or by the digitally processed signals. The STA321 4-Channel Digital Audio System has a full assortment of digital processing features that include a sample rate converter, pre and post mixing, up to 13 programmable 28-bit biquads (EQ) per channel, bass/treble tone control and DRC.