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Analog Audio
An electrical signal that directly represents sound. Compare
this to digital audio which can be an electrical signal, but is an
indirect representation of sound. See also “Digital Audio”.
Aspect Ratio
The width of a TV screen relative to its height. Conventional
TVs are 4:3 (in other words, the TV screen is almost square);
widescreen models are 16:9 (the TV screen is almost twice as
wide as it is high).
Block Noise
A distortion of digital images in the shape of blocks caused by
the application of data compression.
Chapter
Just as a book is split up into several chapters, a title on HDD is
usually divided into chapters. See also “Title”.
Digital Audio
An indirect representation of sound by numbers. During
recording, the sound is measured at discrete intervals (44,100
times a second for CD audio) by an analog-to-digital converter,
generating a stream of numbers. On playback, a digital-to-analog
converter generates an analog signal based on these numbers.
See also “Sampling Frequency” and “Analog Audio”.
Dolby Digital
The system to compress digital sound developed by Dolby
Laboratories. It offers you sound of stereo(2ch) or multi channel
audio.
HDMI (High-Definition Multimedia Interface)
A digital interface between audio and video source. It can
transmit component video, audio, and control signal with one
cable connection.
PCM (Pulse Code Modulation)
The most common system of encoding digital audio, found on
DAT. Excellent quality, but requires a lot of data compared
to formats such as Dolby Digital and MPEG audio. For
compatibility with digital audio recorders (MD and DAT) and
AV amplifiers with digital inputs, this unit can convert Dolby
Digital and MPEG audio to PCM. See also “Digital Audio”.
Sampling Frequency
The rate which sound is measured by a specified interval to
turn into digital audio data. The numbers of sampling in one
second defines as sampling frequency. The higher the rate, the
better the sound quality.
SAP (Secondary Audio Program)
Sub-audio channel which is delivered separately from Main-
Audio channel. This Audio channel is used as an Alternate
channel in Bilingual Broadcasting.
Title
A collection of chapters on HDD. See also “Chapter”.
Glossary
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