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Entries found for search: signal

Control and Display signals : Also called PQ codes. In the CD format, eight additional bits are added to each frame of audio data; this means that a byte of information is available from the disc every 136 Ás. Each bit in the added byte is given a one-letter name, P-W. Thus, eight separate subcodes can be recorded on and recovered from the CD. So far only P and Q are used: the P-code is used for the pause signal between musical tracks and at the end of the last track, and the Q-code tells the player if the recording is two- or four-channel (no quadraphonic CD player is yet available). The Q-code also contains timing information about the tracks and identifies the country of origin and date of the recording. No standard has been defined for the use of the other six subcodes.

keying signal : The signal sent to the keying input of a signal-producing or signal processing device, which then activates the device.

static signal processing : Signal processing in which the nature of the input signal has no effect on the type or amount of processing applied to it, as opposed to dynamic signal processing.

small signal bandwidth : The bandwidth an audio device will exhibit at relatively low signal levels. Most audio devices will have a wider frequency range at low signal levels than high signal levels because of such effects as slew limiting. See power bandwidth.

signal processing : The modulation of an audio signal in a generally desirable way by any device inserted into the audio chain path.

signal processor : See processor.

signal entropy : A condition caused by audio data which is characterized by frequent transienttransients, causing a compression algorithm to poorly encode data. If the signal is compressed before encoding, the data compression will be much more effective, with less effect on the audio. Signal entropy is not a problem for ADPCM-type compression algorithms.

signal generator : A test instrument that produces one or more of the following types of waveforms through a wide range of frequencies: sine wave, square wave, sawtooth, ramp voltage, etc. See Appendix C.

signal ground : Each component of a sound system produces its own internal ground. This is called the audio signal ground of the device. Connecting devices together with cables can tie the signal grounds of the units together in one place through the conductors in the cable. See ground loops, chassis ground.

signal : (1) The desired portion of electrical information, i.e., the information content of any transmission medium, i.e., the part of the waveform that is not noise. (2) A generic name for any one of a number of forms (magnetic orientation, voltage) which audio may take in the program chain.

Pit Signal Processing (PSP) : See digital watermark.

Digital Signal Processing DSP : The manipulation and modification of signals in the digital domain, possibly after having undergone analog-to-digital conversion.

dynamic signal processor : Any electronic device whose type or degree of operation changes with response to level or other characteristic of the input signal, i.e., with feedback, for example compressors, downward and upward expanders, gates, limiters, NRNR systems, flangers, etc. The opposite of static signal processing.

Signal to Noise Ratio indicates how much irritating background hiss is produced as a proportion of the full output power. Numbers higher than 90dB are acceptable and the higher the better. A good indicator of the quality of the amplifier.

Strongest Signal System which repeatedly searches and locks onto the strongest FM signal.

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