JPH10261989A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect movement of a portable telephone set without using a signal from a vehicle velocity sensor. SOLUTION: A radio wave from antennas 1, 2 is supplied to an electric field strength detection part 9 in which strength is detected and sent to a control microcomputer 10. The control microcomputer 10 of a portable telephone set detects a fading period (frequency f) from a time change of the electric field strength and calculates a mobile speed V by using a relation equation f=V/λ between a radio wavelength λ and the mobile speed V. In the case that the portable telephone set is moved, transmission reception restriction or the like is executed. Since the connection to a vehicle velocity sensor is not required, the convenience of the portable telephone set is not lost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone device, and more particularly to a control when the portable telephone device is carried into a moving body such as a vehicle.

[0002]

2. Description of the Related Art In recent years, portable telephones and automobile telephones have been remarkably spread, and the use of telephones while traveling has become a problem.
That is, for example, operating a mobile phone or the like while driving a car is not preferable in terms of safety, and it has been proposed to limit transmission and reception.

For example, Japanese Patent Laid-Open Publication No. Hei 7-115680 discloses that when a signal from a vehicle speed sensor determines that a vehicle is running, when a call is made, the system automatically switches to a call state and cannot respond while running. There is disclosed a car telephone for notifying the other party of a message to the effect.

[0004]

However, in order to execute such control, a detection signal from a vehicle speed sensor must be input to a control system of the telephone, and an interface and a connector circuit are separately required on the telephone side. As a result, there has been a problem that cost increases and the portability and convenience of the telephone are impaired.

The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to detect a moving speed without using a detection signal from a vehicle speed sensor and thereby control a function during movement. It is an object of the present invention to provide a mobile phone capable of performing such operations.

[0006]

In order to achieve the above object, a first invention comprises a detecting means for detecting a fading cycle of a received signal and a calculating means for calculating a moving speed based on the fading cycle. It is characterized by having.
Since there is a one-to-one relationship between the moving speed and the fading period, the moving speed can be indirectly detected by detecting the fading period.

A second invention is characterized in that it has a detecting means for detecting a fading cycle of a received signal, and a control means for controlling transmission and reception based on the fading cycle. Here, the transmission / reception control includes transmission / reception by hands-free, in addition to prohibiting transmission / reception while moving.

[0008] The third invention is a detecting means for detecting a fading cycle of a received signal, a display means for displaying the received signal, and a control for changing a display format on the display means based on the fading cycle. Means. Here, the display format includes moving images and still images,
Changing the display format, including images and characters, generally means changing to a format with a smaller amount of information when moving than when stationary.

In each of the above inventions, it goes without saying that a fading frequency may be detected instead of the fading cycle.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the portable telephone device of the present embodiment. When a radio wave is received by the diversity receiving antennas 1 and 2, the received signal passes through the band-pass filter 3 and the antenna duplexer 4 and is further input to the mixers 5 and 6. The mixers 5 and 6 mix the received signal and the signal from the transmitter 7 and convert the frequency to an intermediate frequency (IF) signal lower than the received signal. The signal from the transmitter 7 is approximately 750 MHz when the received radio wave is in the 800 MHz band, and approximately 1.45 when the received radio wave is in the 1.5 GHz band.
GHz. The intermediate frequency signals from the mixers 5 and 6 are supplied to a modulation / demodulation circuit 8 and also to an electric field strength detector 9. In the electric field strength detection unit 9, the antenna 1
The strength of the signal received from the antenna 2 and the strength of the signal received from the antenna 2 are detected and output to the control microcomputer 10. The control microcomputer 10 converts the input intensity signal into a digital signal with an A / D converter, compares the magnitude of the digital signal in a time-division manner, and controls the modulation / demodulation circuit 8 to select and output the higher intensity signal ( Diversity reception). The strong signal demodulated by the modulation / demodulation circuit 8 is supplied to the speaker 13 and output as an audio signal. The audio signal input from the microphone 12 is modulated by the modulation / demodulation circuit 8, amplified by the amplifier 14, and transmitted from the antenna 2 via the antenna duplexer 4 to the other party. Note that a liquid crystal display (LCD) 11
Displays a reception state and the like, and accepts various operations from the user.

In the radio wave reception by such diversity reception, the control microcomputer 10 of the present embodiment
The cycle of the lowest point (fading cycle) of the received signal converted into a digital signal by the / D converter is measured, and the moving state of the mobile phone device is estimated based on the fading cycle to control transmission and reception. There is.

FIG. 2 shows an example of a change over time in the electric field intensity. The horizontal axis represents time, and the vertical axis represents electric field intensity. As described above, when the time interval of the lowest point of the electric field strength is the fading period, the moving speed of the mobile phone device is V, and the radio wavelength is λ, the fading frequency f is

## EQU1 ## There is a relationship of f = V / λ. That is, if the wavelength λ is known, the moving speed V of the mobile phone device can be indirectly known by detecting the fading period (frequency). For reference, the relationship between the radio frequency (wavelength), the moving speed, and the fading frequency is shown below.

[0014]

[Table 1] Therefore, for example, the radio frequency is 800 MHz and the fading frequency is 3.68 Hz (the fading period is 271 m).
sec), the moving speed of the mobile phone device is 5 km / h, and the fading frequency is 36.8 Hz.
When the fading period is 27.1 msec, the moving speed is 50 km / h.

As described above, the control microcomputer 10 detects the fading cycle (frequency) to determine whether or not the portable telephone device is moving without using a signal from the vehicle speed sensor, and at what speed. It is possible to recognize whether or not the user is moving. For example, when the user is moving, transmission and reception can be automatically restricted. Specific examples of transmission and reception regulations include:
For example, a message such as "I'm driving now. Please try again later" is sent to the other party. If the mobile phone device is connected to the hands-free device, it automatically switches to the hands-free mode. There is.

FIG. 3 is a block diagram showing the configuration when the portable telephone device is connected to the hands-free device. In the hands-free device 200, changeover switches SW1, SW
2. An echo canceller 201, amplifiers 202 and 203, etc. are provided. When the movement of the mobile phone device 100 is detected from the fading cycle (frequency), the control microcomputer 10 turns on the changeover switch and sets the hand-free mode. Move to In this hands-free mode, the signal received from the mobile phone device 100 is echo canceller 201,
The signal is output from the speaker 220 in the vehicle cabin via the amplifier 202. Further, the voice uttered by the user is transmitted from the hands-free microphone 210 to the amplifier 203 and the echo canceller 201.
Is transmitted to the mobile phone device 100 via the PC, and the user can perform transmission and reception without operating the main body of the mobile phone device 100.

Further, when a mobile phone is used to connect to an information center or the like, control such as switching to a still image while moving is possible even if the information sent from the information center is moving image information. FIG. 4 shows an example of such display control. The mobile phone device 100 includes a modem 300 and a VICS (Vehicle Information Communication System).
tem) ECU (electronic control unit) 400 is connected, acquires image information via the Internet or via a beacon,
When the information is displayed on the in-vehicle display 500, if the mobile phone device 100 is stationary, the moving image information is displayed on the in-vehicle display 500 as it is, and if it is detected that the mobile phone device 100 is moving from the fading cycle (frequency). Stops the acquisition of the moving image information and displays only the still image or the still character information on the display 500.

As described above, according to the present embodiment, it is possible to determine whether or not the portable telephone device is moving without using the detection signal from the vehicle speed sensor. Control while moving without impairing the convenience of the system.

In the above embodiment, the speed at which the control during the movement is started may be arbitrary, for example, 5 km.
The control may be started by determining that / h or more is moving.

In the above embodiment, the moving body speed is calculated from the fading cycle (frequency). However, the essential point is that the fading cycle (frequency) is used instead of the vehicle speed sensor. The control microcomputer 10 can also perform transmission / reception control or the like using the value itself. That is, the radio frequency is 8
The fading period detected at 00 MHz is 271 ms
In the case of ec or less, transmission / reception control may be performed.

[0021]

As described above, according to the portable telephone device of the present invention, the presence / absence of movement of the portable telephone device can be detected without using a vehicle speed sensor, so that the physical connection with the vehicle speed sensor becomes unnecessary. Various restrictions while moving can be made without impairing the convenience of the mobile phone device.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is a graph showing a time change of a received electric field strength and a fading cycle.

FIG. 3 is a block diagram showing a connection state between a mobile phone device and a hands-free device.

FIG. 4 is a block diagram showing a connection state between the mobile phone device and a modem or a VICSECU.

[Explanation of symbols]

1, 2 antennas, 3 bandpass filters, 4 antenna duplexers, 5 and 6 mixers, 7 oscillators, 8 modulation / demodulation circuits, 9 electric field strength detector, 10 control microcomputer, 11
Liquid crystal display (LCD), 12 microphones, 13
Speaker, 14 amplifier, 100 mobile phone device, 20
0 hands-free device, 300 modem, 400 VI
CSECU.

Claims (3)

[Claims] 1. A mobile phone device comprising: a detecting unit that detects a fading cycle of a received signal; and a calculating unit that calculates a moving speed based on the fading cycle. 2. A mobile telephone device comprising: a detection unit that detects a fading cycle of a received signal; and a control unit that controls transmission and reception based on the fading cycle. 3. A detecting means for detecting a fading cycle of a received signal, a display means for displaying the received signal, and a control means for changing a display format on the display means based on the fading cycle. A mobile phone device characterized by the above-mentioned.