Microphone proximity detection
First Claim
1. An apparatus comprising:
- a mobile communications device housing having integrated therein;
a downlink channel processor to receive an incoming signal from a far end user;
a speakerphone speaker coupled to an output of the downlink channel processor to receive the incoming signal from the far end user and to output a speakerphone acoustic signal;
a first microphone to pick up voice of a near end user and to output a voice signal of the near end user;
an uplink channel processor to send the voice signal of the near end user to the far end user;
a second microphone to pick up the speakerphone acoustic signal and to output an audio signal; and
an audio signal processor to measure a time domain level of the audio signal to detect a proximity of the apparatus to an object, andwherein the audio signal processor is configured to compare the time domain level measurement to a threshold level to determine the proximity of the apparatus to the object.
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Abstract
A mobile communications device contains at least two microphones. One microphone is located away from the handset receiver and serves to pick up voice of a near end user of the device for transmission to the other party during a call. Another microphone is located near the handset receiver and serves to pick up acoustic output of the handset receiver (a far end signal). A signal processor measures the frequency response of the receiver. The signal processor performs spectral analysis of the receiver frequency response to determine whether or not the device is being held at the ear of the user. On that basis, the device automatically changes its operating mode, e.g., turns on or off a touch sensitive display screen during the call. Other embodiments are also described.
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Citations
7 Claims
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1. An apparatus comprising:
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a mobile communications device housing having integrated therein; a downlink channel processor to receive an incoming signal from a far end user; a speakerphone speaker coupled to an output of the downlink channel processor to receive the incoming signal from the far end user and to output a speakerphone acoustic signal; a first microphone to pick up voice of a near end user and to output a voice signal of the near end user; an uplink channel processor to send the voice signal of the near end user to the far end user; a second microphone to pick up the speakerphone acoustic signal and to output an audio signal; and an audio signal processor to measure a time domain level of the audio signal to detect a proximity of the apparatus to an object, and wherein the audio signal processor is configured to compare the time domain level measurement to a threshold level to determine the proximity of the apparatus to the object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification