1. In sound processing application, Music compression(MP3) is achieved by converting the time domain signal to the frequency domain then removing frequencies which are no audible.
2. The time domain waveform is transformed to the frequency domain using a filter bank. The strength of each frequency band is analyzed and quantized based on how much effect they have on the perceived decompressed signal.
3. The DSP processor is also used in digital video disk (DVD) which uses MPEG-2 compression, Web video content application like Intel Indeo, real audio.
4. Sound synthesis and manipulation, filtering, distortion, stretching effects are also done by DSP processor. ADC and DAC are used in signal generation and recording.