Philips WAC7500 Region code, RF radio frequency, RMS Root Mean Square, VHS signals, Sampling rate

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.

Region code

A system that allows discs to be played only in the region designated.This unit only plays discs that have compatible region codes.You can find the region code of your unit on the product label. Some discs are compatible with more than one region (or ALL regions.)

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.

RGB signals

RGB signals are the three video signals, Red, Green and Blue, which make up a high quality picture.

Rhapsody®

Rhapsody® is an on-line music service that offers streaming on-demand access to its library of digital music.

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.

RMS (Root Mean Square)

A formula that provides a reasonably accurate means to measure and compare continuous AC power.The use of this measure is preferred when matching system components, like amplifiers and receivers.

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S-VHS signals

S-VHS signals are separate Y/C video signals from the S-VHS and Hi-8 recording standards. The luminance signals Y (black and white) and chrominance signals C (color) are recorded separately on the tape.This provides the better picture quality than with standard video (VHS and 8mm) where the Y/C signals are combined to provide only one video signal.

S/PDIF (SPDIF) (Sony/Philips Digital Interface) A standard audio-file transfer-format that was developed jointly by Sony and Philips. S/PDIF allows the transfer of digital audio signals from one device to another, without the need to convert first to analog.This prevents the quality of the digital signal degrading during transfer to analog.

Sampling rate

The precision with which a digital file describes the analog sound it represents. Basically, a lower rate produces files that sound worse and take up less drive space than those with a higher rate. CDs have a sampling rate of 44.1kHz, and DAT machines have a sampling rate of 48kHz. MiniDisc player/recorders with a built-in sampling rate converter can handle both rates.

SD

Secure Digital. A type of memory card with a flash memory.

Sensitivity

Volume that a speaker offers for a specific voltage input, expressed in decibels per watt (dB/W).

Shuffle

A feature that plays audio files (tracks) in random order.

Signal to noise ratio

Represents the difference between the level of the audio signal, and any interference.The larger the figure, the purer the sound.

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