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APPENDIX ➤ Glossary En 73

Audio information

■ Audio decoding format

Dolby Digital

Dolby Digital is a compressed digital audio format developed by Dolby Laboratories, Inc. that supports

5.1-channel audio. This technology is used for audio on most DVD discs.

Dolby Digital EX

Dolby Digital EX creates total 6.1-channel audio from 5.1-channel sources that are recorded with Dolby

Digital Surround EX. This decoder adds a surround back sound to the original 5.1-channel sound.

Dolby Pro Logic II

Dolby Pro Logic II enables 5-channel playback from 2-channel sources. There are three modes available:

“Music mode” for music sources, “Movie mode” for movie sources, and “Game mode” for game sources.

Dolby TrueHD

Dolby TrueHD is an advanced lossless audio format developed by Dolby Laboratories, Inc. to offer a

high-definition home theater experience with the quality of the studio master. Dolby TrueHD can carry up to

eight channels of 96 kHz/24-bit audio (up to six channels of 192 kHz/24-bit audio) simultaneously. This

technology is used for audio on BD (Blu-ray discs).

DTS 96/24

DTS 96/24 is a compressed digital audio format that supports 5.1-channel and 96 kHz/24-bit audio. This

format remains fully compatible with the existing multichannel audio systems that support DTS Digital

Surround. This technology is used for music DVDs, etc.

DTS Digital Surround

DTS Digital Surround is a compressed digital audio format developed by DTS, Inc. that supports

5.1-channel audio. This technology is used for audio on most DVD discs.

DTS-ES

DTS-ES creates total 6.1-channel audio from 5.1-channel sources that are recorded with DTS-ES. This

decoder adds a surround back sound to the original 5.1-channel sound. In the DTS-ES Matrix 6.1 format, a

surround back sound is recorded in the surround channels, and in the DTS-ES Discrete 6.1 format, a

discrete surround back channel is recorded.

DTS Express

DTS Express is a compressed digital audio format that supports 5.1-channel audio and allows a higher

compression rate than the DTS Digital Surround format developed by DTS, Inc. This technology is

developed for audio streaming services on the Internet and secondary audio on BD (Blu-ray discs).

DTS-HD High Resolution Audio

DTS-HD High Resolution Audio is a compressed digital audio format developed by DTS, Inc. that supports

7.1-channel and 96 kHz/24-bit audio. DTS-HD High Resolution Audio remains fully compatible with the

existing multichannel audio systems that support DTS Digital Surround. This technology is used for audio on

most BD (Blu-ray discs).

DTS-HD Master Audio

DTS-HD Master Audio is an advanced lossless audio format developed to offer a high-definition home

theater experience with the quality of the studio master by DTS, Inc. DTS-HD Master Audio can carry up to

eight channels of 96 kHz/24-bit audio (up to six channels of 192 kHz/24-bit audio) simultaneously. This

technology is used for audio on BD (Blu-ray discs).

DTS Neo:6

DTS Neo:6 enables 6-channel playback from 2-channel sources. There are two modes available: “Music

mode” for music sources and “Cinema mode” for movie sources. This technology provides discrete

full-bandwidth matrix channels of surround sound.

DSD (Direct Stream Digital)

DSD (Direct Stream Digital) technology stores audio signals on digital storage media, such as SACD (Super

Audio CDs). The signals are stored at a high-frequency sampling rate of 2.8224 MHz. The highest

frequency response is equal to or higher than 100 kHz, with a dynamic range of 120 dB. This technology

offers better audio quality than that used for CDs.

MP3

One of the compressed digital audio format used by MPEG. With psychoacoustic technologies, this

compression method achieves a high compression rate. Reportedly, it is capable of compressing data

quantity by about 1/10 maintaining a certain level of audio quality.

MPEG-4 AAC

An MPEG-4 audio standard. It is used for mobile telephones, portable audio players, and audio streaming

services on Internet because it allows a high compression rate of data while maintaining better audio quality

than MP3.

PCM (Pulse Code Modulation)

PCM is a signal format under which an analog audio signal is digitized, recorded, and transmitted. This

technology is the basis of all other audio format. This technology is used as a lossless audio format called

Linear PCM for audio on a variety of media, including CDs and Blu-ray discs.

Sampling frequency/Quantization bit

Sampling frequency and quantization bits indicate the quantity of information when an analog audio signal

is digitized. These values are noted as in the following example: “48 kHz/24-bit”.

• Sampling frequency

Sampling frequency (the number of times the signal is sampled per second) is called the sampling rate.

When the sampling frequency is higher, the range of frequencies that can be played back are wider.

• Quantization bit

The number of quantization bits indicate the degree of accuracy when converting the sound level into a

numeric value. When the number of quantized bits is higher, the expression of the sound level is more

accurate.

WAV

Windows standard audio file format, which defines the method of recording the digital data obtained by

converting audio signals. By default, the PCM method (no compression) is used, but you can also use other

compression methods.

Glossary

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