Philips WAC7505 M4A, MP3, Harder it is to drive, Not be converted to an analog format.The

Lossless compression

A system for reducing the number of data bits (density) in a musical signal without corrupting the original.

M

M4A

The audio file format used by Apple in their iTunes Music Store often appears on your system with the ‘.m4a’ filename extension. M4A can produce better audio quality than MP3 using less physical space for the files.

MHz (Mega Hertz)

One million cycles per second.

Midrange

The middle three octaves (more or less) of the audio band, where the ear is most sensitive, usually between 160Hz-3kHz.

Mono (monaural)

The operation of an amplifier in one channel for both input and output. Can refer to an amplifier with only one channel of amplification or operating in bridged mode. For low- frequency amplification applications, it provides better phase coherence and less distortion than stereo operation.

MP3

A file format with a sound data compression system. MP3 is the abbreviation of Motion Picture Experts Group 1 (or MPEG-1) Audio Layer 3.With the MP3 format, one CD-R or CD-RW can contain about 10 times more data than a regular CD.

Mute

A control found on receivers, and some mixers or signal processing units that silences (mutes) a signal path, or output.

O

Ohm	ish
Measure of resistance to current (impedance).	ngl
The lower the impedance of a speaker, the	E
harder it is to drive.
	Glossary
P
PCM (Pulse Code Modulation)
Pioneering form of digital recording.
R
RDS (Radio Data System)
RDS tuners can automatically tune in stations
according to the types of music (or talk) they
broadcast. RDS also enables a receiver to
display text messages and even graphics (usually
call letters and format information) that many
FM stations include on a sub-carrier signal
within their normal broadcast signal. Some RDS
equipped tuners can even override with traffic
alerts or emergency broadcasts, during playback
of other media - CD MD, or cassette.There are
other useful features too, many of which are
offered by the growing number of RDS stations.
RF (radio frequency)
An alternating current or voltage with a
frequency (or carrier wave) above about
100kHz. It is called radio frequency because
these frequencies have a capacity to be radiated
as electromagnetic waves by radio (and
television) stations.
Rip (ripping)
Using a software program that “grabs” digital
audio from a compact disc and transfers it to a
computer hard drive.The integrity of the data
is preserved, because the signal does not pass
through the computer sound card, and need
not be converted to an analog format.The
digital-to-digital transfer creates a WAV file that
can then be converted into an MP3 file.

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