JPH04821A - Radio telephone system - Google Patents

Abstract

PURPOSE:To prevent any trouble from being generated in the control of connection between a connector and a radio telephone set by using only an odd-number radio channel or an even-number radio channel as a talking channel and using the even-number or odd-number radio channel for a control channel. CONSTITUTION:Under the control from a control part 2113 through a radio part control line C, a radio part 2112 selects one of the radio channels, which are decided at constant frequency intervals in advance, and executes transmission/reception. While referring to the state of a zone memory 2114, the control part 2113 recognizes that the equipment is installed in a radio zone 1 among two radio zones. For example, the even-number radio channel is used as the control channel and only the odd-number channel is selected and used as the talking channel. Thus, even when the plural connectors generate non- linear distortion components in talking states, any adverse influence upon the control channel can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless telephone system, and more particularly to a wireless telephone system capable of communicating with other terminal devices via a wired telephone line.

[Conventional technology]

Conventionally, there is a wireless telephone system of this type called a cordless telephone system. A cordless telephone system is comprised of a parent device connected to a wired telephone line and a corresponding wireless telephone connected to the parent device via a wireless line.

In order to support multiple lines, it is necessary to prepare multiple wireless telephones.

[Problem to be solved by the invention] When multiple wireless telephones are prepared within a limited range in order to support multiple lines, depending on the combination of channels used, non-linear distortion may occur that may cause the channel to be actually used. There may be cases where it is determined that the user is using the service even though the user is not using the service.

For example, two nearby frequencies (these are called frequency f,
and f2) is input to a nonlinear element such as a transistor used in a radio section, it generates other frequency components due to the influence of nonlinear distortion. This phenomenon occurs not only in the high-frequency amplifier circuit and frequency conversion circuit of the receiving section of the wireless section, but also in the power amplifier circuit of the transmitting section, which is affected by radio waves from nearby connecting devices and wireless telephones. frequency components caused by the distortion may be retransmitted. In this case, third-order distortion is particularly problematic. Due to the effect of third-order distortion, 2f, -f2 and 2
If the frequency component of f 2 f t matches the frequency of the control channel, the control channel will be in the same state as being exclusive, which will impede connection control. In particular, as the number of wireless telephones in use increases, the probability of matching the frequency of the control channel increases rapidly.

Conventional wireless telephone systems have the disadvantage that the above-mentioned inconveniences cannot be prevented because no special consideration is given to the selection of communication channels used by each wireless telephone.

An object of the present invention is to provide a wireless telephone system that does not become unable to connect due to the influence of such nonlinear distortion.

[Means to solve the problem]

The wireless telephone system of the first invention includes at least one wireless section that is connected to at least one wired telephone line and selects one of a plurality of wireless channels predetermined at constant frequency intervals for transmission and reception. and a connecting device having a control unit that controls the wireless unit to use the even-numbered wireless channels as control channels and the odd-numbered wireless channels as communication channels, and the communication channel specified by the connection device. and at least one wireless telephone for making telephone calls.

The wireless telephone system of the second invention includes at least one wireless unit that is connected to at least one wired telephone line and selects one of a plurality of wireless channels predetermined at constant frequency intervals for transmission and reception. and a connection device having a control unit that controls the wireless unit to use the odd-numbered wireless channels as control channels and the even-numbered wireless channels as speech channels, and the communication channel specified by the connection device. and at least one wireless telephone for making telephone calls.

A wireless telephone system according to a third aspect of the invention comprises a master device connected to at least one wired telephone line, two wireless zones, and a zone storage means, which is connected to the master device by a wired line and during a call. a wireless section that transmits and receives acoustic signals and connection control signals via the wired line and selects one of a plurality of wireless channels predetermined at constant frequency intervals for transmission and reception; The even numbered radio channels are used as control channels according to the contents of the storage means, the odd numbered radio channels are used as communication channels, and in the other radio zone, the odd numbered radio channels are controlled according to the contents of the zone storage means. At least two controllers comprising a control unit that controls the radio unit to use the even-numbered radio channel as a communication channel.
The wireless telephone includes two connecting devices and at least one wireless telephone that performs a call on a communication channel designated by these connecting devices.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the third invention.

The parent device (ME) 100 has wired telephone lines 101, 102,
...accommodates IOJ, wired line 111°112,...
・lln, 1'21, 122. ...Exchange operation with 12m. Wired lines 111, 112. ... Connecting device (CE) 211゜212, ...21 connected to 11n
n is installed in wireless zone 1, and is a wireless telephone (placement) 311 within wireless zone 1.

312, to 31ρ via a wireless line.

Similarly, wired lines 121, 122 . . . . 12m connected to the connecting devices 221, 222. ...22m is installed in wireless zone 2, and the wireless telephone 321 in wireless zone 2
, 322. ...Connect via 32p and wireless line.

FIG. 2 shows a block diagram of the configuration of the connection device 211.

The radio section (TRX) 2112 selects one of the radio channels predetermined at constant frequency intervals to transmit and receive data under control from the control section (CONT) 2113 via the radio section control line C. The exchange of acoustic signals with the wireless telephone is via the parent device connection line 111. Parent device control unit (MEI/F) 2111. This is carried out along the route of the acoustic signal line a and the wireless section 2112.

The control unit 2113 refers to the state of the zone memory (MEM) 2114, learns that it is installed in wireless zone 1 of the two wireless zones, and, for example, selects an even-numbered wireless channel (for example, 46CH) as the control channel. , and select and use only the odd-numbered wireless channel as the call channel.

The configuration and operation of the other connection devices are also the same as the configuration and operation of the connection device 211. Those installed in wireless zone 2 use odd-numbered wireless channels (
For example, 89CH) is used, and only the even-numbered radio channels are selected and used as communication channels.

As described above, by selecting a control channel and a call channel, multiple connected devices are in a call state, and
Even if a component due to non-linear distortion occurs, an adverse effect on the control channel can be avoided. FIG. 3 shows this situation, where the solid line represents the radio waves of the communication channel in use, and the broken line represents the component caused by third-order distortion, which generally has the largest influence among non-linear distortions. Fifth order.

The same can be considered in the case of high-order distortion such as the 7th order. Even-order distortions such as second-order and fourth-order distortions occur in parts that are largely different from the band in use, and therefore do not normally pose a problem.

In the case of Fig. 3(a), all communication channels are odd-numbered channels, so the components caused by nonlinear distortion are all channels corresponding to odd-numbered channels, and the same component as the control channel using even-numbered channels. There is no possibility that this will occur. Similarly, in the case of Fig. 3(b), all communication channels are even channels, so the components caused by nonlinear distortion are all even channels, producing the same components as the control channel using odd channels. There is no possibility.

Therefore, at least the control channel is determined to be in use based on the component caused by the nonlinear distortion, and there is no problem in the wireless connection between the connecting device and the wireless telephone.

The zone storage device may be any device that can determine which zone the device is installed in, such as a switch set at the time of installation, a device determined by selecting a wiring method, or a preset semiconductor memory.

An embodiment of the third invention in which there are two wireless zones has been described above.

Even when there is one wireless zone, the first invention or the second invention is applied, and only the odd or even-numbered wireless channels are used as communication channels, and the even- or odd-numbered wireless channels are used as control channels. The same effect can be achieved by using channels.

〔Effect of the invention〕

As explained above, the first and second inventions utilize only the odd-numbered or even-numbered wireless channels as communication channels and the even-numbered or odd-numbered wireless channels as control channels. A third invention in which there are two, in one zone, the control channel of the even numbered radio channel and the communication channel of the odd numbered radio channel, and in the other zone, the control channel of the odd numbered radio channel and the communication channel of the odd numbered radio channel. By using the second radio channel and the calling channel,
Both inventions avoid the effects of nonlinear distortion caused by installing a large number of radios in close proximity and using them simultaneously, and the control channel is not considered to be in use for a long time. This has the effect that there is no problem in controlling the connection with.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the wireless telephone system of the present invention, FIG. 2 is a block diagram showing the configuration of the connection device 211 in FIG. 1, and FIGS. 3(a) and (b) are both FIG. 2 is a diagram for explaining the frequency relationship between communication channels and third-order nonlinear distortion generated therein in the embodiment shown in FIG. 1; 1.2... Wireless zone, 100... Parent device, 101
゜102, IOJ... wired telephone line, 111,112
゜11n, 121, 122.12n...Wired line, 2
11, 212. 21n, 221. 222.
22m...Connection device, 311, 312, 31. R, 3
21゜322.32P...Wireless telephone, 2111...
- Connection section, 2112... Radio section, 2113... Control section, 2114... Zone storage device, a... Acoustic signal line, b... Connection section control line, C... Radio section control line.

Claims (1)

[Claims] 1. At least one radio section connected to at least one wired telephone line and selecting one of a plurality of radio channels predetermined at constant frequency intervals for transmission and reception, and an even number. a connection device having a control unit that controls the radio unit to use the radio channel of the th radio channel as a control channel and the radio channel of the odd number as a communication channel; and a communication device that uses the communication channel specified by the connection device. 1. A wireless telephone system comprising at least one wireless telephone that performs. 2. At least one radio unit that is connected to at least one wired telephone line and selects one of a plurality of radio channels predetermined at constant frequency intervals for transmission and reception, and odd-numbered radio channels; a connecting device having a control unit that controls the wireless unit to use the even-numbered wireless channel as a communication channel; A wireless telephone system comprising a wireless telephone. 3. A parent device connected to at least one wired telephone line, forming two wireless zones, a zone storage means, connected to the parent device via a wired line, and transmitting an acoustic signal through the wired line during a call. a wireless section that transmits and receives a connection control signal and selects one of a plurality of wireless channels predetermined at constant frequency intervals for transmission and reception; The wireless channels are used as control channels, the odd-numbered wireless channels are used as communication channels, and in the other wireless zone, the odd-numbered wireless channels are used as control channels according to the contents of the zone storage means, and the even-numbered wireless channels are used as control channels. At least two connecting devices each having a control unit that controls the wireless unit to use a wireless channel as a conversation channel, and at least one wireless telephone that performs a conversation on a designated conversation channel from these connecting devices. A wireless telephone system characterized by: