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US 9,247,331 B2Granted
Temperature compensated microphone
AssigneeNokia Technologoies Oy
InventorMikko Veli Aimo Suvanto
Life of this patent
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Abstract
A method and a device for eliminating or minimizing the sensitivity changes in a microphone due to temperature changes. The temperature-induced changes in the sensitivity can be caused by the changes in the sound-to-electrical signal transducer, in the microphone membrane, in the ASIC or other reasons. One or more temperature dependent components in the microphone or in a microphone module are used to offset the temperature-induced changes in the sensitivity. Sensitivity of a microphone is defined as the output voltage for a specific acoustic stimulus and load condition.
Claims13
An apparatus, comprising:
- a micro-electro-mechanical system microphone, comprising:
- a micro-electro-mechanical system microphone element comprising a sound-to-electrical signal converter, the converter configured to provide an electrical signal to an input of at least one amplifier module in response to a sound signal;
- and
- an integrated circuit comprising:
- the at least one amplifier module configured to respond to the electrical signal for providing an amplified signal so as to provide an electrical output based on a sensitivity value defined by a relationship between the sound signal and the electrical output;
- and
- a temperature dependent element configured to provide a change signal indicative of a change in temperature, the change signal arranged to change a gain of the at least one amplifier for maintaining the sensitivity value substantially constant in a temperature range.
4 more elements
A method comprising:
- providing, in a micro-electro-mechanical system microphone, a micro-electro-mechanical system microphone element comprising a sound-to-electrical signal converter, the converter configured to provide an electrical signal to an input of at least one amplifier in response to a sound signal;
- arranging, in an integrated circuit in the micro-electro-mechanical system microphone, a temperature dependent element for providing a change signal for use in the at least one amplifier, the at least one amplifier being part of the integrated Circuit and configured to provide an electrical output based on a sensitivity value defined by a relationship between the sound signal and the electrical output, the change signal indicative of a change in temperature, the micro-electro-mechanical system microphone configured to respond to the sound signal for providing the electrical output based on a sensitivity value of the micro-electro-mechanical system microphone;
- and
- maintaining, in the micro-electro-mechanical system microphone and by using at least the at least one amplifier, the sensitivity value of the micro-electro-mechanical system microphone substantially constant in a temperature range based on the change signal.
1 more element
An electronic device, comprising:
- first and second micro-electro-mechanical system microphones, each of the first and second micro-electro-mechanical system microphones comprising:
- a micro-electro-mechanical system microphone element comprising a sound-to-electrical signal converter, the converter configured to receive a sound signal and provide an electrical signal indicative of the sound signal;
- and
- an amplification part, responsive to the electrical signal, for providing an electrical output of the micro-electro-mechanical system microphone based on a sensitivity value defining a relationship between the sound signal and the electrical output, the amplification part having a gain arranged to respond to a change in temperature for maintaining the sensitivity value substantially constant in a temperature range;
- and
- a control module configured to equalize the sensitivity value of the first microphone to the sensitivity value of the second microphone.
3 more elements
Dependencies are inferred from the claim text.