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

摘要

A interface circuit for an acoustic transducer provided with a first detection structure and a second detection structure has: a first input and a second input; a first processing path and a second processing path coupled, respectively, to the first input and second input and supply a first processed signal and a second processed signal; and a recombination stage, which supplies a mixed signal by combining the first processed signal and the second processed signal with a respective weight that is a function of a first level value of the first processed signal. The first and second inputs receive a respective detection signal associated, respectively, to the first detection structure and to the second detection structure of the acoustic transducer; and an output stage the first processed signal, the second processed signal or the mixed signal, on the basis of a second level value of the first processed signal.

主权项

1. A digital interface circuit for an acoustic transducer provided with a first detection structure and a second detection structure, said digital interface circuit comprising:
a first input and a second input 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 coupled, respectively, to the first input and the second input and configured to respectively supply a first digital processed signal and a second digital processed signal; a recombination stage configured to supply a mixed signal, via combination of the first digital processed signal and the second digital processed signal with a respective weight that is a function of a first level value of said first digital processed signal, the recombination stage includes a first level meter configured to measure the first level value based on the first processed signal, the first level meter is configured to measure said first level value as root-mean-square value of said 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, the output stage includes:
a second level meter configured to measure a second level value as peak value of the first processed signal, the second level value being different from the first level value; anda selector stage configured to select alternatively the first digital processed signal, the second digital processed signal, or the mixed signal, on the basis of the second level value of the first processed signal.