Digital electronic interface circuit for an acoustic transducer, and corresponding acoustic transducer system

An acoustic transducer system, comprising:

• a first detection structure and a second detection structure, which are separate and distinct from one another and have different characteristics of detection of acoustic-pressure waves;
• and
• a digital interface circuit, coupled to said first detection structure and second detection structure, the digital interface circuit including:
• first and second inputs configured to receive first and second detection signals, respectively, from the first and second detection structures, respectively;
• a first digital processing path and a second digital processing path, which are coupled to the first input and the second input, respectively, and are configured to supply a first digital processed signal and a second digital processed signal, respectively;
• a recombination stage configured to supply a mixed signal, via combination of said first processed signal and second processed signal with a respective weight that is a function of a first level value of said first processed signal, the recombination stage including a first level meter configured to measure the first level value based on the first processed signal;
• a second level meter configured to measure the second level value as a peak value of the first processed signal;
• and
• an output stage configured to selectively supply at an output alternatively said first digital processed signal, said second digital processed signal, and said mixed signal on the basis of the second level value of the first processed signal.

A device, comprising:

• an audio signal processing circuit configured to receive a first audio signal and a second audio signal from a first membrane and a second membrane, respectively, the circuit including:
• a first processing path configured to process the first audio signal and configured to generate a first processed signal;
• a second processing path configured to process the first audio signal and configured to generate a second processed signal;
• a recombination stage configured to receive the first processed signal and the second processed signal and configured to generate a mixed signal, the recombination stage includes:
• a first measurement module configured to receive the first processed signal and configured to generate a first measured signal;
• a mixing module configured to receive the first measured signal, the second processed signal, an upper threshold value, and the lower threshold value, and configured to generate the mixed signal;
• and
• a second measurement module configured to receive the first processed signal and configured to generate a peak signal, the second measurement module includes:
• an absolute value calculation unit configured to receive the first processed signal and configured to generate an absolute value signal;
• and
• a comparator unit configured to compare the absolute value signal with a noise reference value;
• a selection stage configured to receive the peak signal, the upper threshold value, and the lower threshold value, and configured to generate a selection signal based on a comparison of the first processed signal with the upper threshold value and the lower threshold value;
• and
• a multiplexer configured to output one of the first processed signal, the second processed signal, and the mixed signal based on the selection signal.