JPH0295057A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To hold a smooth call condition by sending an alarm sound to a call circuit network and warning to a speaker holding a moving machine when the limit intensity level of a receiving radio wave received from a fixed machine with a moving machine is reduced in a call condition. CONSTITUTION:When an electric field intensity level between a fixing machine 200 and a moving machine 100 becomes the limit receiving level or below set beforehand, a control part 105 provided in the moving machine 100 is synchronized to a detecting signal outputted from a radio circuit part 101 when the receiving electric field intensity is a limit receiving level or below, a tone signal sending is instructed to a tone generating part 103, and thus, an operator recognizes continuously the tone signal during the output of the detecting signal. Consequently, the operator holding the moving machine 100 can execute the condition identification of the radio communication, namely, the reduction of the electric field intensity, and attention can be called so as to move to an action for the call condition improvement before the call is interrupted. Thus, without shutting off the call, the smooth call condition can be held.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cordless telephone, and in particular to information transmission between a mobile device having a transmitter and a handset, and a fixed device having a circuit for connection to a telephone line. The present invention relates to a cordless telephone that transmits and receives information by wireless communication.

[Conventional technology]

Conventionally, in this type of cordless telephone set, when the state of reception of radio waves from a mobile unit, especially when the critical strength level of the received radio waves has decreased, the fixed unit performs call recovery control, etc.

[Problem to be solved by the invention]

The above-mentioned conventional cordless telephone is designed to perform call recovery control, etc. for a connected call that is in a call state when the fixed unit cannot receive radio waves from the mobile unit. Therefore, there is a drawback that a smooth conversation cannot be maintained due to call disconnections that occur when the operator of the mobile device moves out of the range of radio waves.

[Means to solve the problem]

The cordless telephone of the present invention has an interface function for accommodating and connecting at least one telephone line to a mobile machine having a transmitter and a handset, and connecting the telephone line to the mobile machine. A cordless telephone comprising a fixed device that transmits and receives information by wireless communication, and the mobile device includes a communication circuit network unit that is an interface unit for connecting with the transmitter and receiver to make a voice call;
a first radio circuit unit having a modulation/demodulation unit that modulates/demodulates a voice signal input/output from the communication circuit network unit into a radio signal; and a reception limit identification unit that identifies the reception limit of received radio waves; and the communication circuit network unit. The fixed device has an alarm sound generation section that sends out an alarm sound to the section, and a control section that starts, stops, and reads the status of each section. It is configured to include a second wireless circuit unit that sends and receives signals.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an equipment configuration diagram showing equipment constituting a cordless telephone according to an embodiment of the present invention.

In FIG. 1, the telephone 1 to telephone 1 of this embodiment is comprised of a fixed device 200 connected to a telephone line 2, and a mobile device 100 connected wirelessly to the fixed device 200.

FIG. 2 is a block diagram showing an example of the configuration of the mobile device in the embodiment shown in FIG.

In FIG. 2, the mobile device in this embodiment], OO modulates and demodulates the radio signals transmitted and received with the fixed device 200, and, for example, when the radio waves used are FM radio waves, the OO modulates and demodulates the radio signals to the set squelch level in advance. Margin level of the specified level, for example 3d
a wireless circuit section 101 having a minimum received electric field detecting means for detecting the lowest received electric field that can be demodulated into the voice with B added; and a communication circuit that inputs and outputs the demodulated or modulated voice signal from the wireless circuit section 101. a network section 102, a tone generating section 103 that generates an audible frequency alarm sound to warn the operator of the reception status, a handset section 104, and a control that controls starting, stopping, etc. of each of the above-mentioned sections. 105. The configuration of the fixing device 200 is not related to the features of the present invention, and therefore a description thereof will be omitted.

Next, the operation of this embodiment will be explained using FIG. 1 and FIG. 2 together.

In this operation description, the operations of making and receiving calls as a normal telephone are well known and will therefore be omitted. Further, regarding the present operation description, the operation of the mobile device 100 when the cordless telephone 1 of this embodiment according to the present invention is in a call via the telephone line 2 will be explained. Also, fixed machine 2
00 and the mobile device 100 communicate using FM radio waves.

First, the mobile device 100 uses the radio circuit section 101 to connect the fixed device 200 to the fixed device 200.
In addition to transmitting and receiving FM main phone calls from
In addition to the squelch level set in advance by the hardware of the radio circuit unit 101 regarding the reception of radio waves from 00, the electric field strength can be set to the limit reception level, which is a feature of the present invention, for example, to the limit reception level with 3 dB added as a quantitative value. When detecting a decrease, the wireless circuit section 101 outputs a detection signal to the control section 105.

This means that the operator holding the mobile device 100
This is an operation when the electric field strength detected by the wireless circuit section 101 has decreased to the critical reception level due to moving away from 0 or to a place where radio wave propagation is obstructed.

At this time, the control section 105 performs tone generation control on the tone generation section 103, and transmits the tone signal to the communication circuit network section 103.
Send on 02. The telephone communication network section 1.2 superimposes the tone signal input from the tone generation section 103 on the reception signal of the telephone voice input from the radio circuit section 101, and then outputs the signal to the handset/receiver section]
Output to 04.

The operator recognizes the tone signal that is heard superimposed on the received voice output from the handset unit 104 and recognizes that the wireless communication state between the fixed device 200 and the mobile device 100 is degraded. , approach the fixed unit 2°O or take action to restore the radio wave propagation state.

The control unit 105 instructs the tone generation unit 103 to transmit a tone signal in synchronization with the detection signal output from the wireless circuit unit 101 when the received electric field strength is below the critical reception level, so that the operator can: It is possible to continuously recognize the tone signal while the detection signal is being output.

In this embodiment, only the main functional blocks are illustrated and explained for convenience of explanation, but some functions are provided by the central processing unit,
For example, since it is processed and executed by programs and data stored in the main memory of a microprocessor, it is not limited to the block configuration shown in FIG. 2, but may be any structure that can perform the above-mentioned functions.

〔Effect of the invention〕

As explained above, the present invention enables an alarm sound to be sent from an alarm sound generator provided in the mobile device to the transmitter/receiver to notify that the electric field strength level between the fixed device and the mobile device has fallen below a preset limit reception level. By transmitting this signal to the operator who is holding the mobile device, it is possible to identify the state of wireless communication as a decrease in field strength, and to take action to improve the call condition before the call is interrupted. Since the user's attention can be called to attention, there is an effect that call disconnections can be eliminated and a smooth call state can be maintained.

[Brief explanation of drawings]

FIG. 1 is an equipment configuration diagram according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of the configuration of a mobile device in the embodiment shown in FIG.

Claims (1)

[Claims] A mobile device having a transmitter and a receiver, and an interface function for accommodating and connecting at least one telephone line to the telephone line, and wireless communication for transmitting and receiving information between the mobile device and the mobile device. In a cordless telephone equipped with a fixed device and a fixed device, the mobile device has a communication circuit network section which is an interface section for connecting with the transmitter and receiver to perform voice calls, and input/output from this communication circuit network section. a first radio circuit unit having a modulation/demodulation unit that modulates/demodulates a voice signal received into a radio signal and a reception limit identification unit that identifies a reception limit of received radio waves; and an alarm that sends an alarm sound to the communication circuit network unit. The fixed device has a sound generating section and a control section that starts, stops, and reads the status of each section, and the fixed device has a second controller that interfaces with the telephone line and sends and receives wireless signals to and from the mobile device. a wireless circuit section;
In a call state, when the reception level of the radio waves received by the mobile device from the fixed device drops to a preset reception limit level, the alarm sound is sent to the call circuit network to the caller who held the mobile device. A cordless telephone characterized by a warning.