JPH01293052A - Telephone set with cordless handset - Google Patents

Abstract

PURPOSE:To hold a telephone line in a reserved state after conveying the telephone line holding intention to the talking partner and to restart talking by resending carriers after charging the power source of a handset or moving to another place by not disconnecting the telephone line when the carriers are abruptly discontinued, but automatically holding the connected state and sending reserving tones to the telephone line. CONSTITUTION:When receiving section 4 becomes incapable of receiving carriers from a transmitting section 9 due to the exhaustion of the power source on a handset side or the bad state of an antenna, a carrier detection circuit 15 detects it and informs a control circuit 13 of the 'discontinued carrier'. Upon receiving the information of the 'discontinued carrier', the control circuit 13 immediately sets a talking circuit 1 to a reserved state through a reservation controlling output and holds the telephone line by actuating a reservation circuit. Simultaneously, the control circuit 13 sends reserving sounds to the telephone line through the reservation circuit of the talking circuit 1 by driving a reserving sound generation circuit. Therefore, the talking can be restarted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a handset cordless telephone that uses radio wave communication between the telephone main body and the handset, and particularly prevents accidental disconnection of the carrier transmitted from the handset. The present invention relates to a handset cordless telephone that prevents the telephone line from being opened in the event of a telephone line being disconnected.

[Conventional technology]

Conventionally, this type of handset cordless telephone cannot make a call if the carrier is inadvertently disconnected, such as when the mobile handset's power supply (e.g. battery) is exhausted or when radio wave transmission is obstructed by the usage environment. In some cases, the voice was interrupted, and the line continued to be silent, or the phone line was disconnected at the same time as the carrier was disconnected for the sake of public network safety.

[Problem to be solved by the invention]

The above-mentioned conventional handset cordless telephone goes silent when the carrier is disconnected, so the person on the other end of the call cannot tell that there is an inadvertent and temporary interruption of the call due to a wireless function failure, and the other party cannot hear the call. However, if the call does not end, the caller assumes that there is a problem with the telephone line network and ends the call on its own, or with conventional equipment that releases the telephone line at the same time as the carrier disconnects, the call is forcibly terminated. Therefore, even if carrier propagation is restarted by recharging the device or moving and changing the environmental conditions, the call state cannot be resumed, and in order to resume the call, it is necessary to make a new call to call the other party. There was a drawback that it had to be done.

Furthermore, some conventional handset cordless telephones of this type have a hold circuit in the call circuit that holds the telephone line in order to hold the telephone line, but this circuit cannot be operated by operating the hold key. It was designed to connect the telephone line to a hold circuit, and was not intended to capture the telephone line when the carrier was disconnected.

[Means to solve the problem]

The handset cordless telephone of the present invention includes a fixed wireless circuit comprising a telephone call circuit including a hold circuit, a transmitting section connected to a transmitting output of the telephone circuit, and a receiving section connected to a receiving input of the telephone circuit. a hold key, a control circuit that detects the operation of the hold key and activates the hold circuit in the call circuit, and a mobile receiver corresponding to the transmitter and receiver of the fixed wireless circuit; A handset cordless telephone having a mobile radio circuit comprising a transmitter and a transmitter connected to the mobile transmitter and a handset connected to the mobile receiver, respectively, the mobile receiver in the fixed radio circuit; a carrier detection circuit connected to the mobile radio circuit that detects a carrier wave transmitted from a mobile transmitter in the mobile radio circuit and transmits it to the control circuit; and a control signal that activates a hold circuit of the control circuit to generate a hold tone signal. and a hold tone generating circuit that sends the hold tone to a hold circuit in the call circuit.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The telephone call circuit 1 is connected to a telephone line, has a receive output and a transmit input, and is connected to a transmitter 3 and a receiver 4 of a fixed wireless circuit 2, respectively.

The transmitter 3 and the receiver 4 are each connected to an antenna 5, and send and receive radio waves. On the other hand, inside the handset,
Mobile radio circuit 7 consisting of a mobile receiver 8 and a mobile transmitter 9
, a receiver 11 connected to a mobile receiving section 8, a transmitter 12 connected to a mobile transmitting section 9, and an antenna 10 connected to a mobile radio section.

The control circuit 13 accommodates a hold key 14 and transmits a hold control output to the call circuit 1 and the hold tone generation circuit 16. The output of the hold tone generation circuit 16 is connected to a hold circuit inside the call circuit 1. The input of the carrier detection circuit 15 is connected to the receiving section 4, and the output is connected to the control circuit 15.

During a call, the receiver 8 receives the radio waves from the transmitter 3 via the antennas 5 and 10, and at the same time the receiver 4 receives the radio waves from the mobile transmitter 9 via the antennas 10 and 5. When the receiving section 4 becomes unable to receive the radio waves from the transmitting section 9 as a carrier due to power outage or deterioration of the condition of the antenna, the carrier detection circuit 15 detects this and transmits "carrier disconnection" information to the control circuit 13. The control circuit 13 [immediately upon receiving the carrier disconnection J information, puts the telephone call circuit 1 on hold through the hold control output and operates the hold circuit to hold the telephone line];
At the same time, the hold tone generating circuit is driven to send the hold tone to the telephone line through the hold circuit of the call circuit 1.

〔Effect of the invention〕

As explained above, the present invention automatically puts the call on hold without disconnecting the telephone line when the carrier is suddenly disconnected, and also sends a hold tone to the telephone line to indicate to the other party the intention to put the call on hold. This has the effect that the connection state of the telephone line can be maintained by transmitting the information, and that the call can be resumed by resuming carrier transmission when the handset is charged or moved to another location.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. 1...Telephone circuit, 2...Fixed radio circuit, 7...Mobile radio circuit, 13...Control circuit, 15...Carrier detection page 1

Claims (1)

[Claims] a fixed wireless circuit including a telephone call circuit including a hold circuit; a transmitter connected to a transmitter output of the call circuit; and a receiver connected to a receiver input of the call circuit; a hold key; a control circuit for detecting a key operation and activating the hold circuit in the call circuit; a mobile receiving section and a mobile transmitting section corresponding to the transmitting section and the receiving section of the fixed wireless circuit; A handset cordless telephone having a mobile radio circuit comprising a transmitter connected to a mobile transmitter and a handset connected to the mobile receiver, the mobile radio circuit being connected to the mobile receiver in the fixed radio circuit; A carrier detection circuit detects a carrier wave sent out from a mobile transmitter in the mobile transmitter and transmits it to the control circuit, and a control signal for activating a hold circuit of the control circuit generates a hold tone signal and transmits the hold tone in the call circuit. 1. A handset cordless telephone set, comprising: a hold tone generation circuit that sends out to a holding circuit of the handset.