Patent ID: 11950860
Assignee: CILAG GMBH INTERNATIONAL
Field: Audio-visual technology (Electrical engineering)
Classification: CPC A  H  G | IPC A  G  H

Claim 18:
19. An audio circuit, comprising:
a processor;
an audio amplifier coupled to the processor by audio data lines;
an audio mitigation control circuit coupled to the processor and the audio amplifier,
a digital-to-analog converter (DAC) comprising a first analog output channel coupled to a first speaker;
a first current shunt coupled in series with the first speaker;
a first current sense amplifier having an input coupled to the first current shunt and an output coupled to an input of a first analog-to-digital converter (ADC); and
wherein an output of the first ADC is coupled to the audio mitigation control circuit;
wherein the audio mitigation control circuit is configured to:
fetch, from a memory coupled to the audio mitigation control circuit, a unique identification number to identify an expected audio file, the expected audio file comprising audio data comprising an audio asset and a unique super-audible tone to identify the audio asset;
receive the audio data from the output of the first ADC;
filter the audio data to isolate a super-audible frequency range of the audio data;
calculate a fast Fourier transform (FFT) on the audio data in the isolated super-audible frequency range;
perform a peak detection function on the FFT results to detect a super-audible tone;
compare the detected super-audible tone to the unique identification number to identify the expected audio file; and
determine a specific audio file transmitted to the audio amplifier based on the comparison.