DIGITAL MICROPHONE WITH ADJUSTABLE GAIN CONTROL

摘要

Approaches are provided for an apparatus that includes an input buffer, an analog-to-digital converter coupled to the input buffer, a decompress module coupled to the analog to digital converter, and a gain control module coupled to the input buffer and the decompress module. The input buffer has a first adjustable gain and operating in the analog domain. The analog-to-digital converter converts the input analog data received from the input buffer into digital data. The decompress module operates in the digital domain, and is configured to decompress the digital data received from the analog-to-digital converter. The decompress module has a second adjustable gain and produces an output digital signal. The gain control module determines when to compensate for changes in characteristics the input analog data by selectively controlling the first gain of the input buffer in the analog domain and the second gain of the decompress module in the digital domain.

主权项

1. An apparatus, the apparatus comprising:
an input buffer, the input buffer configured to receive and store input analog data from a transducer, the input buffer having a first adjustable gain and operating in the analog domain; an analog-to-digital converter coupled to the input buffer, the analog-to-digital converter configured to convert the input analog data received from the input buffer into digital data; a decompress module coupled to the analog to digital converter, the decompress module configured to operate in the digital domain, the decompress module configured to decompress the digital data received from the analog-to-digital converter, the decompress module having a second adjustable gain and producing an output digital signal; a gain control module coupled to the input buffer, and the decompress module, the gain control module configured to determine when to compensate for changes in characteristics the input analog data by selectively controlling the first gain of the input buffer in the analog domain and the second gain of the decompress module in the digital domain.