SoundExpression SE14SRS, Руководство пользователя

Страница: 63 / 72

63
Appendix L: Glossary of
Audio Terms
amplitude. The variation in a sound signal
producing varying levels of loudness. Measured
in decibels (dB).
analog sound. Recorded sound depicted by
fluctuations in amplitude.
bits per sample . The number of bits employed
to record information from a single sample
when recording digital sound. See Sampling.
CD quality. Recording quality similar to that of
a compact disc player. This means that 16 bits of
information are recorded for every sample
taken. See Bits Per Sample and Sampling.
decibel (db). A means of measuring amplitude.
digital sound . Recorded and stored sound as a
series of numerical values rather than
fluctuations in amplitude.
line-in. A connector on audio equipment to
which a device like a CD-player or tape cassette
player may be attached. See also Line Out.
line out. A connector on audio equipment to
which audio components can be attached such
as stereo speakers. See also Line In.
MIDI . Musical Instrument Digital Interface. A
standard which allows for the exchange of data
between two music synthesizers or a
synthesizer and a computer. Sound data may be
communicated from the synthesizer to the
computer and stored as a MIDI file. Or, a MIDI
file can be transmitted to the synthesizer for
playback.
MPU-401. A UART on the MIDI port which
allows MIDI interface to transmit and receive at
32.5K baud (see Appendix E for more
information).
pitch. A sound’s tone, usually determined by
the sound’s frequency.
sample. A measurement of sound taken during
a certain duration. In digital recording,
sampling means recording voltages which make
a sound as a sequence of numerical values
representing the sound’s amplitude.
sound file . Any file which holds sound data.
Examples: files with .MID file name extensions
are compatible with the MIDI standard (see
above); a file with a .WAV file name extension is
a standard Microsoft file format for storing
waveform audio data. See Waveform and wave
file.
timbre. How the ear identifies and classifies
sound. Example: the timbre of the same note
played by two different instruments (flute and
tuba) will not be the same.
voice annotation. Embedding of a voice
message into a document for later playback.
wave file. A standard Microsoft file format for
storing waveform audio data.
waveform. A graph showing the amplitude of a
sound over a particular interval of time. Any
portion of that interval is a sample.
Modem Command Reference