Patent ID: 9246457
Filing Date: 2016-01-26
CPC Classification: H03F,H04S

Claim Text:
1. An amplifying device, comprising: first and second amplifying sections for amplifying first and second audio signals of a pair of channels, respectively, so as to output first and second output signals; a third amplifying section for amplifying a third audio signal of a channel different from the pair of channels so as to output a third output signal; and a control section for inputting a control signal for instructing the first and second amplifying sections to stand by or operate into the first and second amplifying sections, and inputting another control signal for instructing the third amplifying section to stand by or operate into the third amplifying section, wherein each of the first to third amplifying sections includes a modulation circuit for, when the respective control signal for instructing standby or the operation is input from the control section, modulating the respective audio signal into a switching signal, an output stage circuit for outputting the respective output signal, and a driving circuit for, when the respective control signal for instructing the operation is input from the control section, driving the output stage circuit in response to the switching signal, and when the respective control signal for instructing standby is input from the control section, stopping the driving of the output stage circuit, wherein each of the first to third amplifying sections further includes, an abnormality detecting circuit for detecting abnormality occurring in the first to third amplifying sections, and an interface circuit that generates a protect signal representing occurrence of abnormality so as to output the signal to the control section when the respective control signal for instructing the operation is input from the control section and the abnormality detecting circuit detects abnormality, and does not generate the protect signal when the respective control signal instructing standby is input whether or not the abnormality detecting circuit detects abnormality.