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An analog-to-digital conversion technique that is known as a method that enables the development of high-precision AD converters, by employing high-speed sampling and loop structures. This method is widely used for sound-based AD converters.
 digital terrestrial television and radio broadcasts
Refers to the Japanese terrestrial broadcasting standards, ISDB-T for television, and ISDB-TSB for radio.
 OFDM demodulator
A demodulator that uses orthogonal frequency-division multiplexing (OFDM) conversion frequencies. This type of demodulator is used for digital terrestrial television and radio broadcasting.
 variable-gain function
A function that enables an amplifier's gain (degree of amplification) to be varied. In order to be able to receive a weak signal, it is necessary to amplify the signal into a strong one by using an amplifier. However, if an amplifier's gain is fixed at a set level, it amplifies even strong incoming signals and thereby overwhelms a receiver's processing capacity. Thus, it is essential to vary gain accordingly with the strength of incoming signals.
 dynamic range
The ratio between the maximum and minimum values of a usable signal.
In negative-feedback loop systems such as for delta-sigma modulators, a large phase lag of the loop causes instability to the system because the lag makes the feedback positive. To stabilize the system, phase lag must be reduced and controlled by means of phase-compensation.
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Date: 09 February, 2005
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