Sound close detection for mobile terminal and other equipment

A technology of equipment and mobile phones, which is applied to branch office equipment, measuring devices, and the use of re-radiation, etc., and can solve problems such as weight gain, cost increase, and power consumption of equipment
CN1197422CInactive Publication Date: 2005-04-13NOKIA MOBILE PHONES LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NOKIA MOBILE PHONES LTD
Publication Date
2005-04-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method and apparatus for detecting whether an object is in the vicinity of a device, the method comprising: generating a measurement signal; driving an output acoustic transducer of the device with the measurement signal; monitoring the input acoustic transducer to detect the measurement signal; The change determines that an object is near the device. The device may include a cellular telephone, a mobile telephone such as a personal communication device. When the device comprises a mobile phone, the determining step can be used to verify that hands-free operation can be entered, and / or can be used to set the volume of a signal driving a loudspeaker, and / or can be used to select, modify or adjust audio processing techniques. The determination step can also be used to automatically switch from the hands-free operating mode to the handheld operating mode. The monitoring and determining step includes the steps of operating a plurality of adaptive filters in parallel at different step sizes on the same input data to produce first and second impulse response estimates, respectively, and calculating the difference between the first and second impulse response estimates The value is compared with a threshold value.
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Description

technical field

[0001] The present invention relates generally to devices such as mobile terminals, wireless telephones and cellular telephones, and more particularly to techniques for sensing a user's proximity to the device. Background technique

[0002] There are many kinds of proximity sensors, which are used, for example, in various devices as limit switches, or to detect the movement of objects relative to each other, and for other types of control purposes. Typically, these sensors are based on photoelectric, ultrasonic or capacitive principles.

[0003] One example of the use of proximity detection relates to telephony, particularly (but not exclusively) to wireless telephony such as cellular telephones and personal communication devices. A feature known as Integrated Hands Free (IHF) makes it possible to use a phone without having to hold it to your ear or hold it in your hand. In hands-free mode, the sound pressure produced by the headset cap (which can be though...

Claims

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