JPH05244232A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To avoid the interruption of speech due to a disturbed radio wave by automatically holding a telephone line during communication in response to a detection output of a means, detecting the radio wave of a prescribed level or over with a prescribed frequency. CONSTITUTION:When a CPU 5 in a master set 1 receives a disturbance radio wave whose level is a prescribed level or over with a prescribed frequency through a radio reception section 28 during trunk line talking of a slave set 30 via a telephone line L, a CPU 5 sets the line L to be in a holding state. Through the constitution above, interruption of speech due to malfunction of the radio reception section 28 is avoided when a disturbance radio wave with large power is received during trunk line talking of the slave set 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone apparatus which accommodates a telephone line in a base unit and has a wireless transmission / reception unit, and which connects a handset unit via the wireless transmission / reception unit and the wireless line.

[0002]

2. Description of the Related Art A conventional cordless telephone device of this type is
When making a call from the slave unit side, when the call button of the slave unit is pressed or the slave unit is taken out of the charger, an activation request signal is transmitted from the slave unit side to the master unit side via the control channel of the wireless line. The base unit receives this activation request and detects an idle call channel, and if the call channel is free, it sends the idle call channel number to the handset side through the control channel to specify the call channel on the receiver side. While switching to the channel, both the transmitting side and the receiving side are switched to the designated communication channel based on the designated channel availability information from the slave unit via the control channel. After that, when receiving the line acquisition data from the cordless handset side via the designated call channel, the telephone line is captured, and when the dial data is received from the cordless handset side, the dial signal is sent to the telephone line. Incoming call to. Then, depending on the response from the other party, the call is established.

In such a call state, an interfering radio wave such as a CB radio is emitted from a passing truck, for example.
If the output is larger than the specified value, the wireless line is disconnected and the call is interrupted. This is because the current radio wave is interfered by the interfering radio wave and only the receiving sensitivity below the required level is obtained, and the interfering radio wave of the high power output causes the receiving unit to malfunction or erroneously detect.

[0004]

In the conventional cordless telephone device, when a jamming radio wave such as a high-power CB radio is output during a call, the radio receiving section malfunctions, and the radio line is regarded as disconnected and the call is in progress. There was a problem of disconnecting even the telephone line.

[0005]

In order to solve such a problem, the present invention provides a detecting means for detecting a radio wave having a predetermined level or more and a predetermined frequency, and a telephone call during a call according to the detection output of the detecting means. And a control means for automatically holding the line. Further, it is provided with an informing means for informing the handset of the fact that the telephone line is on hold in accordance with the non-detection output of the detecting means after the control means holds the telephone line.

[0006]

When a radio wave having a predetermined level or more and a predetermined frequency is detected during a call, the telephone line is put on hold. Further, when the radio wave disappears after the telephone line is held by the radio wave, the handset is notified of the hold. As a result, when the handset performs a hold response operation, the hold of the telephone line is released and the call can be resumed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a cordless telephone device according to the present invention. In the figure, the device is
It is composed of a master unit 1 and a slave unit 30, and the master unit 1
Is configured as follows. That is, 5 is a CPU, 10
Is a loop and reversal detection circuit for detecting a DC loop or reversal of the telephone line L, 11 and 13 are diode bridges, 12
Is an incoming detection circuit, 14 is a transistor for closing a loop and sending a DP dial signal, 15 is a communication circuit, 1
Reference numeral 6 is an IDROM, 17 is a hook switch, 18 is a key portion including various keys, 19 is a display portion, 20 is a tone ringer for ringing a ring tone, and 21 is a speaker. Further, 22 is a dial IC for generating the above DP dial signal or PB dial signal, and 23 is a PB from the telephone line L.
A PB receiver for receiving a dial signal, 24 a cassette mechanical unit for recording / reproducing a voice signal, 25 a line signal detecting unit for detecting various signals such as dial tone and busy tone from the telephone line L, and 26 a telephone A voice IC for sending a voice message to the line L, a wireless transmission / reception unit 27 for communicating with the child device 30 via a wireless line, a wireless reception unit 28 for detecting an interfering radio wave such as an incoming CB radio, and an amplifier 29. is there.

The slave unit 30 is constructed as follows. That is, 31 is a wireless transmission / reception unit that communicates with the base unit 1 via a wireless line, 32 is an IDROM, 33 is a key unit including various keys, 34 is a CPU, and 35 is a ringing tone or other ringing tone. Tone ringer for, 36 is a speaker,
37 is an amplifier.

In such a cordless telephone device,
When the handset 30 presses the call button in the key unit 33 or picks up the handset 30 from the charger so that the handset 30 makes an office line call, the CPU 34 detects this and the wireless line, that is, the wireless transceiver 31 , And transmits an activation request signal through a control channel to the wireless transmission / reception unit 27 in the base unit 1 via the antennas A2 and A1. The CPU 5 in the base unit 1 receives the activation request signal, checks whether or not there is a free call channel, and if the call channel is free, sends the free call channel number to the control channel via the wireless transceiver 27. Then, the call channel on the receiving side of the handset 30 is switched to the designated channel, and the call channel is switched to the designated call channel on both the transmitting side and the receiving side based on the designated channel availability information from the handset 30 side via the control channel. Then C
The PU 5 captures the telephone line L when receiving the local line capture data from the slave unit 30 side through the designated call channel, and subsequently, when receiving the dial data from the slave unit 30 side, sends the dial signal to the telephone line L. And call the other party.
Then, when the other party responds, it shifts to the line call state.

In this way, when the slave unit 30 is making a station line call via the wireless line and the telephone line L, if an interfering radio wave such as CB radio is emitted, the CPU 5 in the base unit 1 causes the wireless reception unit 28 to operate. This interference radio wave is received via. That is, if the frequency of the jamming radio wave has a frequency band of the control channel or the communication channel and the power of the jamming radio wave is large enough to disconnect the radio line, the radio receiving unit 28 sets It is detected and sent to the CPU 5. CPU5
When such an interfering radio wave is received, the telephone line L is put into the hold state without being disconnected.

FIG. 2 is a flow chart showing the operation of the CPU 5 when the above-mentioned jamming radio wave is received. That is, when "interfering radio wave detected?" In step 100 is determined to be "Y" by receiving the interfering radio wave, it is determined in step 101 whether the handset 30 is in a call via a wireless line, that is, a wireless transmitting / receiving unit. To judge. In this case, cordless handset 3
If 0 is in a call using the wireless line, it is then determined in step 102 whether this call is a line call via the telephone line L, and the line of the cordless handset 30 via the telephone line L is judged. When it is determined that the call is made, the telephone line L is put on hold (step 103) and the jamming flag is set (step 1).
04) and shifts to the other processing of step 105.

[0012] In addition, if no jamming radio wave is detected, step 1
If it is determined to be "N" in 00, it is determined in step 106 that the jamming flag is set, and if the jamming flag is set at this time, the handset 30 is notified that the telephone line L is held. To the wireless transmitter / receiver 2
7 is transmitted to the handset 30 via the communication channel through the handset 3
The hold alarm sound is output from the speaker 36 of 0 (step 107), and the jamming flag is reset (step 1).
08), and shifts to the other processing of step 105.
In this case, if the handset 30 performs the hold response operation, the telephone line L
Is released and the call is resumed.

As described above, when the jamming radio wave is detected, the telephone line L in the call is put on hold, and when the jamming radio wave is no longer detected, the handset 30 outputs the holding alarm sound. The call can be resumed by the hold response operation of the child device 30.

[0014]

As described above, according to the present invention,
When a radio wave having a predetermined level or more and a predetermined frequency is detected during a call, the telephone line is put on hold, so that disconnection of the call can be avoided. Further, when the radio wave disappears after the telephone line is held by the radio wave, the handset is informed of the hold, so that the call can be resumed by the hold response operation of the handset.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a cordless telephone device according to the present invention.

FIG. 2 is a flow chart showing the operation of the apparatus of the above embodiment.

[Explanation of symbols]

 1 base unit 5 CPU 12 incoming call detection circuit 15 call circuit 22 dial IC 27 wireless transmission / reception unit 28 wireless reception unit 30 slave unit 31 wireless transmission / reception unit 33 key unit 34 CPU A1, A2 antenna

Claims (2)

[Claims] 1. A cordless telephone device comprising a base unit accommodating a telephone line and having a wireless transmission / reception unit, and a slave unit connected to the wireless transmission / reception unit via a wireless line. A cordless telephone device comprising: a detection unit that detects a radio wave of a frequency; and a control unit that automatically holds the telephone line during a call according to the detection output of the detection unit. 2. The cordless telephone device according to claim 1, wherein the control unit notifies the slave unit of the holding of the telephone line in response to a non-detection output of the detecting unit after the holding of the telephone line. A cordless telephone device comprising means.