Integrated circuit attached to microphone
AssigneeFortemedia, Inc.
InventorLi-Te Wu
Life of this patent
Estimating the term…
Abstract
The invention provides an integrated circuit attached to a microphone. In one embodiment, the integrated circuit comprises a buffer, a gain stage, an analog-to-digital converter (ADC), and a memory module. The buffer buffers a first signal generated by the microphone, and outputs the first signal as a second signal. The gain stage amplifies the second signal according to an adjustable gain to obtain a third signal. The analog-to-digital converter converts the third signal from analog to digital to obtain a fourth signal as an output of the integrated circuit. The memory module stores the adjustable gain and outputs the adjustable gain to the gain stage for controlling amplification of the gain stage.
Claims24
An integrated circuit attached to a microphone, comprising:
- a buffer, buffering a first signal generated by the microphone, and outputting the first signal as a second signal;
- a gain stage, amplifying the second signal according to an adjustable gain to obtain a third signal;
- an analog-to-digital converter (ADC), converting the third signal from analog to digital to obtain a fourth signal as an output of the integrated circuit;
- and
- a memory module, storing the adjustable gain, and outputting the adjustable gain to the gain stage for controlling amplification of the gain stage.
A method for gain calibration for a microphone module, wherein the microphone module generates an output signal according to an adjustable gain, comprising:
- setting the adjustable gain of the microphone module to a default gain;
- playing a monotone sound in front of the microphone module;
- after the microphone module converts the monotone sound according to the default gain to the output signal, determining a new gain according to the output signal;
- and
- setting the adjustable gain of the microphone module to the new gain.
A microphone gain calibration system, comprising:
- a speaker, playing a monotone sound;
- a microphone module, comprising a microphone converting the monotone sound into a first signal, and an integrated circuit amplifying the first signal according to a default gain to generate an output signal;
- and
- a computer, determining a target sensitivity, measuring an actual sensitivity of the microphone module according to the output signal, determining the new gain according to the default gain and a difference between the target sensitivity and the actual sensitivity, and changing an adjustable gain of the integrated circuit from the default gain to the new gain.
An integrated circuit attached to a microphone, comprising:
- a buffer, buffering a first signal generated by the microphone, and outputting the first signal as a second signal;
- a filter, filtering the second signal according to an frequency response to obtain a third signal;
- an analog-to-digital converter (ADC), converting the third signal from analog to digital to obtain a fourth signal as an output of the integrated circuit;
- and
- a memory module, storing the frequency response, and outputting the frequency response to the filter for controlling filtration of the filter.
Dependencies are inferred from the claim text.