Besides processing the NC/EC algorithms, the built-in low-power, general-purpose programmable DSP in the TC94B24WBG allows customers to implement their own software in the audio codec to help differentiate their products from the competition.
Additionally, the TC94B24WBG includes a 2-ch Analog Electret Condenser Microphone (AECM) interface, 4-ch Digital Electret Condenser Microphone (DECM) interface, a battery conserving class-G headphone amplifier, ear-speaker amplifier, asynchronous sampling rate converter, 4-ch I2S interface, I2C/SPI interface and audio post processing (equalizer, dynamic-range controller).
The TC94B24WBG comes equipped with two analog and four digital microphone inputs to suit a variety of customer needs. Toshiba's unique audio processing algorithm, however, needs just one analog microphone to efficiently provide NC/EC simultaneously.
Outstanding noise cancellation on the TC94B24WBG is achieved through a Toshiba proprietary one-microphone algorithm. The algorithm distinguishes between voice and noise with statistical noise estimation while Toshiba's improved minimum mean square error method in frequency domain removes noise only and makes the voice remain natural.
The excellent echo cancellation algorithm has a time-domain echo cancelling adaptive filter and a frequency-domain echo suppression. The former removes linear echo, the latter suppresses the residual non-linear echo. These two main processes work together closely and intelligently to achieve high-quality echo cancellation by the same microphone used for the noise cancellation.
Mass production is scheduled to begin in February 2013