Audio Processing

The Spectrum Analyzer is useful in Audio players for car/home/portable environments to display the frequency spectrum. It can provide useful information to equalize the environment. It can also be used to see the effect of equalization.

Sample rate conversion (SRC) is the process of changing the sampling rate of a signal to obtain a new representation of the signal.

Fractional Sample Rate Converter is used to compensate or match two digital clocks. When a digital audio signal is derived from a clock source and processed by another component using a different clock source, the minute mismatch between clocks, will cause drift, which over a period of time causes time sync issues, under run or overflows.

The module is also referred to as asynchronous sample rate converter

Variable Speed Playback is used in language learning and dictation systems or for listening to voice messages. Allows speed of speech to be altered between 50% to 200%.

The implementation maintains the pitch of speech, allowing the speech to sound natural, even if played at different speeds, without sounding squeaky or distorted

Dynamic Range compression (DRC) is used in compressing the dynamic range of audio. Widely used in Televisions and Car Audio solutions, the Dynamic Range compression allows audibility of low-level sounds and reducing the high-level sounds based on lower and upper thresholds without introducing audio distortion.

The conventional DRC operates in time domain, whereas the Multi band DRC operates on each band individually and compresses each band separately, giving a superior audio performance.