Mobil terminal and tilt angle counting method for mobile terminal
A mobile terminal, tilt angle technology, applied in the direction of measuring tilt, equipment with sensors, telephone communication, etc.
Inactive Publication Date: 2009-07-29
YAMAHA CORP
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Problems solved by technology
However, the device described in JP-A-10-185608 is a device for correcting the influence of regional differences in the geomagnetic field on the posture detection device, and cannot solve the above-mentioned problems caused by the influence of walking and the like.
In addition, the small acceleration sensor disclosed in JP-A-11-160349 cannot solve the above problems.
Method used
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[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1The mobile phone 100 is a foldable mobile phone having two casings of a terminal unit 200 and a terminal unit 300 . In this specification, the casing of the terminal unit 200 is sometimes referred to as the main body of the mobile terminal (mobile phone 100). The antenna 235a is an antenna for transmitting and receiving radio signals to and from a wireless base station. The RF (Radio Frequency) unit 201 converts the reception signal received via the antenna 235 a into a reception signal of an intermediate frequency, and outputs it to the modem unit 202 . Furthermore, the RF unit 201 modulates the transmission signal input from the modem unit 202 into a signal of a transmission frequency, and outputs the signal to the antenna 235 a for transmission. The modem unit 202 performs demodulation processing of a reception signal input from the RF unit 201 and modulation...
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A portable terminal, such as a cellular phone, and a tilt angle computing method capable of measuring the inclination of itself while suppressing effects of a user's walk etc is provided. A main control part 220 acquires data on magnetism and acceleration from a magnetic sensor control part 211 when the tilt angle of a cellular phone 100 itself is required during the execution of processing of an application program. The tilt angle of the cellular phone 100 is determined on the basis of the data on acceleration, and the angle of elevation of geomagnetism is also determined on the basis of the data on magnetism. The main control part 220 recomputes the tilt angle on the basis of the determined angle of elevation of geomagnetism and the data on magnetism, processes on the basis of the tilt angle only in the case that the tilt angle from the acquired magnetism is applicable, and processes on the basis of the tilt angle previously determined from the data on acceleration in the case that the tilt angle based on magnetism is not applicable.
Description
technical field [0001] The present invention relates to a method of calculating an inclination angle of a mobile terminal such as a mobile phone and a main body of the mobile terminal, which measure the inclination of itself. Background technique [0002] Some mobile terminals such as mobile phones have tilt sensors for detecting their own tilt angles. Such a tilt sensor detects a component of gravitational acceleration, and the mobile terminal calculates a tilt angle based on the detected acceleration. However, the user of the mobile terminal sometimes uses the mobile terminal while walking. In this case, the tilt sensor also detects the acceleration caused by walking, so there is a problem that the tilt angle cannot be accurately obtained. [0003] In addition, devices described in JP-A-10-185608 and JP-A-11-160349 are known as prior art. However, the device described in JP-A-10-185608 corrects the influence of regional differences in the geomagnetic field on the posture...
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IPC IPC(8): G01C9/00
CPCH04M2201/34H04M2201/38H04M2250/12H04M1/72454
Inventor 佐藤秀树
Owner YAMAHA CORP