Digital microphone with adjustable gain control
First Claim
1. An apparatus comprising:
- an input buffer configured to receive an input analog signal, 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 signal 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 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 control the first gain of the input buffer in the analog domain and the second gain of the decompress module in the digital domain based on a signal metric.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
110 Citations
20 Claims
-
1. An apparatus comprising:
-
an input buffer configured to receive an input analog signal, 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 signal 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 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 control the first gain of the input buffer in the analog domain and the second gain of the decompress module in the digital domain based on a signal metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method in an electrical circuit, the method comprising:
-
receiving an input analog signal at an input buffer, the input buffer having a first adjustable gain; converting the input analog signal received from the input buffer into digital data;
at a decompress module configured to operate in the digital domain, the decompress module having a second adjustable gain, decompressing the digital data and producing an output digital signal;controlling the first gain of the input buffer and the second gain of the decompress module based on a signal metric, wherein the gain of the decompress module is inversely related to the gain of the imput buffer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A microphone comprising:
-
a transducer structured to convert sound energy to an analog signal; and an integrated circuit coupled to the transducer, the integrated circuit comprising; an input buffer, the input buffer configured to receive the analog signal from the 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 analog signal 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, the decompress module having a second adjustable gain and producing an output digital signal; and a gain control module coupled to the input buffer and the decompress module, the gain control module configured to inversely control the first gain of the input buffer in the analog domain and the second gain of the decompress module in the digital domain based on a signal metric. - View Dependent Claims (18, 19, 20)
-
Specification