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| Definitions |
A: MP3 refers to a compression scheme that is very widely used to transmit audio on the Internet. It has limited fidelity but is universally compatible with both hardware and software players. Developed originally as a stereo format, there are now versions that will support 5.1 surround sound. Back to topA: Dolby Digital is a perceptual encoding and decoding technique that is one of the audio standards required for DVD-Video discs. Also know as AC-3, Dolby Digital uses bandwidths between 192 kbps and 640 kbps. The usual allocation is 448 kbps, which is sufficient to encode 5.1 channel movie soundtracks and music concerts at reasonable quality. Dolby Digital is a lossy compression scheme that delivers about the equivalent of 48 kHz/20-bit audio. Back to top
A: Digital Theater Systems [aka DTS] is a competing compression and decompression technology developed for the motion picture industry. It is used as an optional format for DVD-Video discs and requires roughly 3 times the bandwidth of AC-3. DTS is a lossy algorithm that delivers 48 kHz/20-bit quality. Back to top
A: MLP or Meridian Lossless Packing is a lossless encoding and decoding scheme developed for use on DVD-Audio discs. It is program dependent but offers between 25-40% reduction in the file size and bandwidth. MLP is not one of the standard formats associated with movies but has been renamed and can be found on both Blu-Ray and HD-DVD as Dolby TrueHD. Back to top
Q: DSD [Direct Stream Digital]
A: DSD is a 1-bit encoding scheme using a sampling rate of 44.1 kHz x 64 [2.8224 MHz] that is used by Sony/Phillips in their SA-CD format. It measures a directional change rather than the absolute amplitude of a particular sample. Because of the very high sample rate it claims to be more accurate to the analog waveform. Back to top
A: DAD & HDAD are marketing terms used by several labels to describe DVD-Video titles that deliver audio and no video. The DVD-Video specification includes 96 kHz/24-bit stereo PCM audio. The purveyors of DAD [Digital Audio Disc] and HDAD [High Definition Audio Disc] are simply using the capability of the format and attempting to brand it as a unique format. Back to top
A: 5.1 Surround Music uses a standard ITU home theater surround system to deliver music that is completely immersive. By employing additional channels, audio reproduction becomes more emotionally engaging and closer to the live event. Audio engineers and producers are embracing surround sound and trying different mixing models. There are 'Stage' perspective mixes and 'Audience' perspective mixes. Back to top |
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