Amplification device i.e. Class D amplifier, for semiconductor microchip of audio codec, has units formed of gain unit, monitoring circuit, absolute value module, and threshold detector, crossing modulator to increase signal to noise ratio

摘要

The device i.e. Class D amplifier (A11), has a digital delta-sigma modulator (11) receiving a digital input signal (IS) e.g. audio signal, and introducing a noise component in a quantified signal (QS) provided by the signal. Units formed of gain unit (MT12), Input signal's amplitude monitoring circuit (ADET), absolute value module, threshold detector i.e. hysteresis relay are used for applying a gain to the signal (IS) or the signal (QS) and crossing the modulator when amplitude (X) of the signal (IS) is les than threshold so as to increase signal to noise ratio between an output signal (OS) and the component.