JPS6295032A - Signal sending-out method for cordless telephone system - Google Patents

Abstract

PURPOSE:To send and receive exactly a control signal at the time of waiting, and to prevent a control signal from disturbing a call at the time of calling, by transmitting it on a larger transmission level than that of the time of calling, at the time of waiting. CONSTITUTION:After decoding a signal by a control part 21, whether it coincides with the code of a base set I or not is collated, and in case of a call of its own telephone set, an automatic answering signal ACK is outputted, and this signal is transmitted by a frequency F2 from a transmitting antenna 22. The answering signal is inputted to a control part 1 through a receiving antenna 3, the collation of a cordless telephone set II is executed in the same way, and after it is completed, when an answer is executed to a call after hook-off by the cordless telephone set II, a hook-off code is sent out, received again by a base set II, and a DC loop is made in a subscriber line H. In this state, a telephone exchange station A connects one of calling subscribers B-D to the subscriber line H and enters into a call. At the time of a call, it may suffice that the output level of a transmitter 4 or 24 is controlled so that switching devices 8 and 28 are lowered by controllers 1 and 21, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal transmission method for a cordless telephone device, which is suitable for applications where the antenna direction changes between standby and talk time, such as in a cordless telephone device. It is.

Conventional technology (general) In wireless communication devices such as cordless telephones, when making a call, the antennas of the telephone and (cordless) telephone are often aligned in the same direction, but when waiting for a control signal, the telephone is placed on a desk. Because it is worn close to the human body (ζ), the received electric field drops and communication is often impossible.In addition, the 1llll signal uses a different band from the voice signal even during a call, and is transmitted at the same time as the call. It is often done.

No, no. (11) When the transmission power of the control signal is increased, there is a problem that the control signal leaks into the call signal during a call and causes interference. SUMMARY OF THE INVENTION An object of the present invention is to provide a signal sending method for a cordless telephone device that eliminates the above-mentioned drawbacks of the prior art and provides a receiving output during standby without causing interference during a call.

Means for Solving the Problems In order to achieve the above object, the present invention transmits a control signal at a high level from both wireless communication devices during standby, and returns it to a normal level during a call. It is configured as follows.

Effect: According to the control signal transmission method described above, the control signal is sent at a high level during standby, so even if conditions such as the transmission space or antenna orientation are bad, the receiving section can receive sufficient input.
On the other hand, during a call, the control signal returns to a steady level, so that there is no interference with the call.

EXAMPLE An example of the present invention will be described below with reference to the drawings. In FIG. 1, the cordless telephone device is connected to a telephone line (
It consists of a fixed base set (1) and a mobile cordless telephone (■) connected to the base set (1).

The Heiseset (1) and the cordless telephone (It) have similar configurations with the exception of some parts. 2, 21 is a control section, 2 and 22 are transmitting antennas (TANT), 3,
33 is a receiving antenna (RA, NT), 4, 24 is a transmitter, 5, 25 is a receiver, 6.26 is a combining unit, 7, 27 is a decomposing unit, 8, 9. ．． 28.29 is a level switch, 10
is a power input terminal, 11 is a timer, 30 is a battery for power supply,
31 is a handset (RFC), 32 is a transmitter (MIC), 3
3 Hafsar etc. signal al'BUZ), 3.1 is the telephone Fuchs Ino Sen (H8). A is a telephone exchange, B, C, and D are wired telephones, and 11 is a telephone subscriber line.

Next, the operation will be explained.

(1) Call from base set to cordless telephone When a call is received from telephone exchange A via subscriber line I,
The control unit 1 of the base set (1) is detected and the base set (I) is put into an operating state. The control section 1 transmits the calling signal via the switching device 8, the combining section 6, and the transmitter 4 to the cordless telephone ([1) through the transmitting antenna 2 at a frequency F1. At this time, the calling signal is 4.5 KI (z, 750b
This is a digital signal of /sec and is maintained at a high level. A cordless telephone (Ill is operated by a battery 30, and after receiving a calling signal with a receiving antenna 23, a receiver 2
5. The signal is input to the control section 21 via the decomposition section 27 and the switch 29. After decoding the control unit 21, ＼-Suse,, l-
(It is checked whether it matches the code of 11, and if it is calling the own machine, an (automatic) response signal (A, CK) is output, and this signal is passed through the level switch 28, synthesis section 26, and transmitter 24. The response signal is transmitted from the transmitting antenna 22 at frequency F2.The response signal is input to the control unit 1 via the receiving antenna 3, receiver 5, decomposition unit 7, and switch 9.The control unit 1 similarly transmits the cordless telephone ( [1 verification is performed, and after completion, when the cordless telephone fnl answers the call after hook-off, the hook-off coat is sent, and the base se
h(n) and creates a DC loop on the subscriber line H. Here, telephone exchange A connects one of the callers (B to D) to subscriber line H and starts a call. During a call, the output level of the transmitter 4 or 24 may be controlled by the switches 8 and 28 to be lowered by the controllers 1 and 21, respectively.

(2) Calling the base set from the cordless telephone In this case, as in (1), the call starts with the hook-off of the Fukusui nochi 34 of the cordless telephone (n), and the base set (
1), the output levels of the transmitters 24 and 4 may be controlled to be reduced.

Note that the timing of the decrease in transmitter output is call L]
-! It is also possible to detect the change from 1 to talk, or alternatively, the timer 1 can be used to cause the change to occur at a fixed time after the start of the call.

FIG. 2 shows how a base set (I) and a cordless telephone (It) are used as wireless communication devices.

In addition, the transmitting antenna 2 and the old receiving antenna 3 of the Heath Nanaso 1-fl) or the transmitting antenna 22 and the receiving antenna 23 of the cordless telephone (II) must each be used as a single antenna as shown in Fig. 2. There are many.

As described in detail, the present invention is configured to transmit at a higher transmission level during standby than during a call, so that control signals can be reliably exchanged during standby. Since the transmission level is lowered during a call, the control signal has the advantage of not interfering with the call.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a device used in a signal sending method of a wireless communication device according to an embodiment of the present invention, and FIG. 2 is a perspective view of the same external appearance. (I)... Hesseno +-1 (n)... Cordless N
Talk Fk, 1+21-control unit, 2, 22... transmitting antenna, 3, 23... receiving antenna, 4.24... transmitter, 8.28- level switcher. Name of agent: Patent attorney Toshio Nakao (1st person, 2nd person)
Figure F/)

Claims (1)

[Claims] A signal sending method for a cordless telephone device, which is provided with a level switching means between a base set connected to a telephone line and the cordless telephone, so that the transmission level becomes higher during standby than during a call.