These devices are normally identified by the presence of the Dolby Digital logo:
To be able to use media recorded in Dolby Digital format (DVD video or DVD audio, for example), you need a device with an integrated AC3 decoder. A channel for low frequencies (a subwoofer) for amplifying special effects (like explosions and earthquakes).ĭolby Digital is likely the most commonly used system in home theatre systems.Two channels for the rear speakers, used for reproducing noise and the sound environment, in order to create ambiance.Two audio tracks for the front speakers, for accentuating the context of the sound coming from the central speaker.A central speaker, generally placed on the top of or above the screen, for reproducing dialogue.The Dolby Digital format uses six independent audio channels: For professionals, instead of an AC3 decoder, Dolby Digital uses a system called SR-D. For this reason, the Dolby Digital format is sometimes called Dolby AC3. This algorithm can compress audio streams by a factor of 10 to 12 with a 16-bit sampling rate of 48 kHz, for an overall bitrate of 384 kbps. It should be noted that Dolby Digital is often incorrectly confused with the generic term 5.1.įor consumer electronics, the Dolby Digital format relies on a compression algorithm called Audio Coding 3 (AC3). The Dolby Digital format's bandwidth falls between 20 Hz and 20 kHz, which is also the human hearing range (note that it varies between individuals).ĭolby Digital audio tape can be encoded in either of the following formats:
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