Manipulation or alteration of analog signals (commonly audio or video signals) after conversion to a digital format. DSP includes such things as surround sound, compression, and more. Dolby Pro-Logic, Dolby Digital, and DTS surround sound formats are all forms of digital signal processing. The MPEG-2 compression scheme is also a form of DSP used with DVDs and digital television to convert video images to a smaller, easier to store format. igital signal processing is also commonly used with surround sound systems to alter the way stereo music is played back. For instance, a stereo recording may be altered so that when played over a full surround sound system it sounds as if the recording is being reproduced in a dance hall or a church. Such ambience enhancement modes can be found on most surround sound preamp/processors and receivers. DSP essentially takes a signal and does new things with it in a digital domain to achieve some desired effect.