Patent ID: 9083288
Filing Date: 2015-07-14
Classification: H03F,H03G,H04R

Abstract:
1. An audio amplification circuit comprising: an input terminal for receipt of an audio input signal, a first preamplifier having an input operatively coupled to the input terminal and an output operatively coupled to a first analogue-to-digital converter to provide a first digital audio signal with a first signal amplification, a second preamplifier having an input and an output operatively coupled to a second analogue-to-digital converter to provide a second digital audio signal with a second signal amplification, and an attenuator, comprising a capacitive voltage divider, operatively coupled in-between the input terminal and the input of the second preamplifier, and responsive to the audio input signal, the attenuator operable to substantially attenuate the audio input signal to the second preamplifier thereby allowing the second analogue-to-digital converter to be capable of handling higher levels of the audio input signal without distortion, wherein the second signal amplification is smaller than the first signal amplification, wherein each of the first and second preamplifiers have an audio frequency amplification controlled by an impedance ratio of two impedances, further wherein the audio amplification circuit is formed on a substrate.