JPH01236740A - Radio telephone system - Google Patents

Abstract

PURPOSE:To surely detect a call signal from a ratio telephone set by switching the reception of a receiver of a host equipment to a calling channel set to a synthesizer at the time of stabilization of the output of the synthesizer. CONSTITUTION:During the holding period, the control circuit 12 of a host equipment 1 switches a changeover switch 25 to the side of an oscillator 24 and sets the reception channel of a receiver 8 to the control channel to monitor the call signal from a ratio telephone set 2. The switch 25 is changed over to the side of a synthesizer 9 at the timing when the output of the synthesizer is stabilized and the receiver 8 allows a detecting circuit 11 to detect whether the calling channel is idle or not. The reception channel of the receiver 8 is successively switched to the control channel and the next calling channel in this manner, and the call signal from the telephone set 2 is monitored and an idle channel is detected. Since the time is used for control channel until the output of the synthesizer 9 is stabilized, the call signal from the telephone set 2 is surely detected even when it is short.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a multi-channel access system for transmitting and receiving voice or data by detecting an empty communication channel among a plurality of communication channels. The present invention relates to a wireless telephone device.

(Prior Art) Conventionally, a telephone is composed of a parent device connected to a wired line, and a wireless telephone connected to the parent device by wireless communication.
After controlling the incoming and outgoing calls between the parent device and the wireless telephone using one control channel, an empty channel among the multiple communication channels is detected based on the strength of the received electric field, and this empty communication channel is used. 2. Description of the Related Art A telephone device (cordless telephone device) that allows telephone calls is known.

(Problem to be Solved by the Invention) However, in the conventional parent device of the telephone, one synthesizer controls the receiving channel of the receiver.
! configured to switch between the voice channel and the talk channel. Therefore, when detecting an optical call from a wireless telephone and detecting an empty communication channel, the frequency of the carrier wave output from the synthesizer must be sequentially switched to the frequency of the control channel and the communication channel.

However, it takes a certain amount of time for the output of the synthesizer to become stable. For this reason, the time set in the call channel becomes longer, and as a result, the time interval set for the control channel also becomes longer.If the transmission time of the call signal from the wireless telephone is short, the call signal will be detected. The problem was that it was no longer possible.

An object of the present invention is to provide a radiotelephone device that can reliably detect a calling signal from a radiotelephone n.

[Structure of the Invention] (Means for Solving the Problem) The present invention includes a first oscillator that generates a reception local frequency corresponding to a control channel, and a first oscillator that generates a reception local frequency corresponding to a control channel and a frequency corresponding to each of the control channel and a plurality of communication channels. a second oscillator for outputting, a switching means for switching the outputs from the first and second oscillators and inputting them to a receiver, and sequentially switching the receiver to a reception state of a control channel and a communication channel; and the switching means After switching the output of the first oscillator to the side that selects the output of the first oscillator, the second oscillator is controlled so as to output a frequency corresponding to the communication channel, and furthermore, this second oscillator is
The above object is achieved by providing the 12 device with a grave means that switches the switching means to the side that selects the output of the second oscillator when the frequency of the oscillator becomes stable.

(Function) The switching means is switched to the output side of the second oscillator when the output of the second oscillator becomes stable, and before the output becomes stable, the switching means switches to the output side of the second oscillator. It has been switched to the output side of the shaker. Therefore, the time it takes for the output of the second oscillator to stabilize can be used as the time for the control channel. Even if the calling signal from the telephone filter is short, it can be reliably detected. moreover,
Immediately after switching to a communication channel, it is possible to detect whether the channel is free or not, thereby eliminating overall wasted time.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention, which is composed of a parent device 1, W, and a telephone n2.
is connected to the right-hand telephone line 3.

The parent device 1 has a hybrid circuit 4, transmission (,1l135,
A transmitting antenna 6, a receiving antenna 7, a receiver 8, a synthesizer 9, a receiving electric field detecting circuit 10, an empty channel detecting circuit 11, an l1tll@ circuit 12, an oscillator 24 that outputs a local frequency for restricted channel reception, a changeover switch 25,
It includes a rectification stabilization circuit 27 for rectifying AC100 from the AC plug 26, a current limiting resistor 28, a charging terminal 29, a line switch 34, and an incoming call signal detection circuit 35.

The radio telephone 2 includes a receiving antenna 13, a receiver 14, a receiver 15, a transmitter 16, a transmitter f117, and a transmitter antenna 18.
, transmission general-purpose synthesizer 19, reception □ synthesizer 2
0, control circuit 21, received electric field detection circuit 22, sounder 2
3, a charging terminal 30, a battery 31, a keypad 32, and a hook switch 33.

In the above configuration, the control circuit 12 of the parent device 10 switches the changeover switch 25 to the output side of the oscillator 24 during the waiting period until an incoming call signal arrives from the wired telephone port 1i13.
The reception channel of the receiver 8 is set to the control channel (C-CH), and the calling signal from the mobile phone n2 is monitored.

At the same time, the frequency of the synthesizer 9 is selected and set to one of a plurality of communication channels (S-C)-1). Then, at a timing when the output of the synthesizer 9 becomes stable, the selector switch 25 is switched to the synthesizer side, the receiver 8 is placed in the receiving state on the communication channel set at this time, and the detection circuit 11 is caused to detect whether the communication channel is an empty channel. . As a result, if the channel is empty, the number of the empty channel is stored. However, if the channel is not vacant, the selector switch 25 is switched to the output side of the oscillator 24, and the calling signal from the idle telephone 2 is ignored. At the same time, the frequency of the synthesizer 9 is set to the frequency of the next communication channel. Then, when the output of the synthesizer 9 becomes stable, the selector switch 25 is switched again to the output side of the synthesizer 9 at this timing, and it is detected whether the communication channel set at this time is an empty channel.

In this way, the receiving channel of the receiver 18 is sequentially divided into the control channel and the next communication channel, and the optical call q from the wireless telephone 2 is monitored, and an empty channel is detected.

Therefore, the time it takes for the output of the synthesizer 9 to stabilize can be used as the control channel time.
Even if the setting time for the control channel is long and the calling signal from radio telephone R2 is short, this can be reliably detected. Furthermore, it is possible to detect whether or not the channel is idle immediately after switching to a speech channel.

Next, the operation when there is an incoming call from the wired telephone port 413 will be schematically explained.

When the parent device 1 is on standby, when the incoming call signal from the wired telephone line 3 is detected by the incoming call @ number detection circuit 35, the synthesizer 9
Set the oscillation frequency of the control channel frequency to the transmit IF
15 is turned on, and the incoming signal is transmitted from the transmitter 5.

In this case, during the incoming signal, the communication channel (S-C)-1
> designation signal and identification signal (ID code) of wireless phone R2
Contains.

On the other hand, Mu J! Phone a2 is on standby for a certain period of time t1.
1 synthesizer 20 is turned on, its oscillation frequency is set to the control channel frequency, and receiver 14 is turned on. At this time, when an incoming signal is received, the transmission f117
is turned on and an incoming call response signal is sent on the control channel, then the oscillation frequency of the synthesizer 19 and 20 is switched to the designated communication channel (S-C)-1).

When the receiving electric field detection circuit 10 detects the radio wave from the wireless telephone n2, the parent device 1 stops sending out the incoming call signal.

Next, if 10 matches, the 5-CH specified in the incoming signal
Switch to If the IDs do not match, it is a response from another dark blue wireless phone, so wait until there are no more calls from the wired phone port a3, and then return to standby.

After switching to 5-CH, the parent device 1 sends out a bell I@0 signal. When the Pii-free telephone n2 receives this, it sends out a ringing tone from the sounder 23. Therefore, in response to this, if the user turns off the hook by turning on the hook switch 33, 1. Retsu B telephone IF12 sends an off-hook signal,
A call is established.

On the other hand, when the parent device 1 receives the off-hook signal, it stops sending out the bell ringing signal, closes the line relay 34, forms a call loop with the wired telephone line 3, and enters a call state.

On the other hand, the operation when making a call from the wireless telephone □2 is as follows. That is, when the switch 33 is turned on to make a call to the wired telephone line 3, the control circuit 21 determines that the switch 33 should be turned on and starts the calling operation, and changes the oscillation frequency of the synthesizer 19.20. After locking to the control channel, the receiver 'a14 is turned on to receive radio waves on the control channel (C-CH).

Then, the electric field strength of the received radio waves on the control channel is detected by the detection signal of the received electric field detection circuit 22, and if the received electric field strength is not above a certain value, it is determined that the control channel is empty, and the transmission v117 is turned on. A calling signal including an ID code assigned to the self is transmitted. On the other hand, the paddy bag [1!1 is monitoring the presence or absence of received radio waves on the control channel, but when it receives a call signal from the non-B telephone 2, the ID code in it is changed to the combination with Retsua T5 episode n2. If they match, the transmitter 5 is turned on and a response signal (10 codes, 5-CH designation information) is sent to the wireless 28 talk 1 m2 (including) will be sent.

The wireless phone 2 receives the response signal from the parent device 1 on the control channel, detects whether the ID code contained therein matches its own, and if it does, it transmits the synthesizer. 19. The oscillation frequency of 20 is switched to the frequency of the communication channel specified by the parent device 1. On the other hand, parent device 1
After transmitting a response signal, the optical crystal frequency of the synthesizer 9 is switched to the frequency of the communication channel designated for the communication. After switching to the communication channel in this way, the parent device 1 and the wireless phone f12 confirm that the switched communication channel is unused by checking the reception field strength, and if it is an unused communication channel, the transmission 15° is performed. 17 are turned on and put into a talking state.

As a result, the parent device 1 and the wireless telephone 2 are
is connected through the designated communication channel, and by subsequent dialing operations using the dial keypad 32, the telephone layer connected to the wired telephone port 83 can be called and placed in a conversation state.

[Effects of the Invention] As explained above, according to the present invention, the receiving channel of the receiver of the parent device is switched to the communication channel set for the synthesizer when the output of the synthesizer becomes stable, so that the receiving channel of the receiver of the parent device is switched to the communication channel set for the synthesizer. The possible FR interval becomes longer, and it becomes possible to reliably detect calling signals from wireless telephone calls. In addition, it is possible to detect whether the channel is free immediately after switching to a call channel, which reduces the overall
It has the advantage of eliminating time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Parent device, 2... Wireless telephone n, 3... Right a telephone line, 5, 17... Transmitting antenna, 6.18... Transmitting antenna, 7.13... Receiving antenna ,9,19.20
...Synthesizer, 10.22...Received electric field detection circuit, 11...Empty channel detection circuit, 12.21...
- Control circuit, 15... Receiver, 24... Oscillator, 2
5... Selector switch, 33... Hook switch, 3
4... Line relay, 35... Incoming call detection circuit.

Claims (1)

[Claims] Consisting of a parent device connected to a wired line and a wireless telephone connected to the parent device via a wireless line, calls can be made and received between the parent device and the wireless telephone using one or more control channels. In a wireless telephone device that performs a call using a vacant channel among a plurality of communication channels after performing connection control, the first oscillator generates a receiving local frequency corresponding to the control channel; a second oscillator that generates a frequency corresponding to each of the communication channels, and outputs from the oscillator and the second oscillator are switched and inputted to the receiver, and the receiver is sequentially placed in the receiving state of the control channel and the communication channel. a switching means for switching; and after switching the switching means to a side that selectively outputs the output of the first oscillator, controlling the second oscillator to a frequency corresponding to the communication channel; 1. A wireless telephone device, characterized in that the parent device includes control means for switching the switching means to a side that selectively outputs the output of the second oscillator when the frequency of the second oscillator becomes stable.