JPH0227863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cordless telephone consisting of a wireless telephone and a connecting device including a wireless device installed in a subscriber line from an exchange, and particularly to a cordless telephone that shares and uses a plurality of radio frequencies. The present invention relates to a cordless telephone device.

A cordless telephone device replaces the cord part of a regular telephone with a wireless line, and can be carried and used freely within the range of radio waves.The cordless telephone connection device and the cordless telephone are connected via a wireless line. It is structured as follows. When a plurality of sets of such cordless telephone devices are provided, problems such as interference will not occur if individual transmitting and receiving frequencies are assigned to each set of wireless lines. However, in reality, in order to make effective use of frequencies, a small number of frequencies are commonly used to increase the efficiency of radio wave use during each call.

Conventional devices like this currently allocate only two sets of transmitting/receiving frequencies (four frequencies) to three sets of cordless telephone devices, and each device can freely select and use these two sets of frequencies. It shall be configured so that it can be done. detecting that the first set of frequencies is being utilized when a second set of telephone devices attempts to initiate a call while the first set of telephone devices is using the first set of frequencies; , automatically switches to another second frequency set and sets up a wireless line. In this situation, the third
When a set of telephone devices tries to start a call, it is detected that both transmitting and receiving frequency sets are in use, and line connection is disabled, and the system waits until one of the frequency sets becomes free.

Therefore, in such conventional equipment, the number of available frequency pairs and the number of cordless telephone device pairs are each constant, and in order to minimize the probability of line connection failure, the number of available frequency pairs and the number of cordless telephone device pairs are constant. should be made as short as possible. To achieve this, it is necessary to immediately set the line idle after a call ends, and to minimize the amount of time the line is held unnecessarily when there is no call. However, with the devices actually used in the past, it has not always been possible to implement the above measures. That is, in conventional cordless telephones, when a call ends, the cordless telephone subscriber promptly turns on-hook to determine that the call is over. To explain this operation, when the cordless telephone detects an on-hook operation by a cordless telephone subscriber, it transmits a call termination signal to the cordless telephone connecting device. After transmission, the cordless telephone turns off transmission and performs a standby operation. On the other hand, when a cordless telephone connection device receives a call-end signal, it disconnects the line relay and transmission, performs a standby operation, and disconnects the line. In this way, the line in use was opened only by the cordless telephone subscriber's on-hook operation. Therefore, if a cordless telephone subscriber forgets to go on-hook or performs an incomplete on-hook even though the other party has ended the call, the line may remain on hold unnecessarily.
This has the drawback that other subscribers cannot use the set of reserved frequencies, resulting in wasted lines and inconvenience to other subscribers.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cordless telephone device that can quickly idle the line and effectively utilize the allocated frequency even if the cordless telephone subscriber does not completely go on-hook at the end of a call. That's what you're trying to get.

The present invention provides a connection device for a cordless telephone.
A tone detection circuit is installed to detect the busy tone or howler tone from the exchange, and force the line to become idle.

According to the present invention, the connecting device and the telephone are connected to a terminal of a telephone exchange, each having a transmitting section and a receiving section, and connected to each other by a wireless line, and receiving an input signal from the terminal. In a cordless telephone device in which a signal is sent from a transmitting section in a connecting device to a receiving section in a telephone via a line relay, the tone detecting circuit in the connecting device generates a detection output when a busy tone or a howler tone is detected from the input signal. a means for disconnecting at least the line relay based on the detection output; a call-end signal generating means for generating a call-end signal in response to the detection output and inputting it to a transmitter in the device for transmission; Disconnection signal detection means is provided which cuts off the output of the internal transmitting unit when a disconnection signal, which will be described later, is detected from the received wave of the internal receiving unit, and the signal sent from the internal transmitting unit is transmitted to the telephone. A cordless telephone device is obtained, characterized in that the cordless telephone device is provided with means for inputting a signal to be the above-mentioned disconnection signal to the transmitter in the telephone for transmission when the call termination signal is detected.

Next, a detailed description will be given with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In FIG. 1, a connection device 10 has input/output terminals 11 and 12 connected to subscriber lines of a telephone exchange, a line relay 13 connected to the input/output terminal 11, and a line relay 13 connected to the input/output terminal 12. A hybrid circuit 14 (a circuit that converts a 2-wire line into a 2-wire signal sent to and received from the transmitting section and the receiving section) connected to the hybrid circuit 1
4, a tone detection circuit 17 that emits detection signals a and b when a tone is detected, a control section 18, a reception antenna 19 connected to the reception section 15, and a transmission section 16. When the tone detection circuit 17 emits the detection output b, the transmission antenna 20 connected to the
, a disconnection signal detection section 42 that generates a transmission output disconnection signal e when it detects a disconnection signal d, which will be explained later, from the reception section 15, and a power supply B that supplies power to each device. . The telephone 50 also includes a transmitter 31, a receiver 32, a handset 33, and a call-end signal detector 51 that emits a detection signal f when the above-mentioned call-end signal c is detected in the signal received by the receiver 32. , a disconnection signal generator 52 that generates a disconnection signal d upon receiving the detection signal f;
It also includes an indicator 53 that emits a signal sound or a flashing light to notify that the hook-on is not complete.

First, to explain the universal operation in the above configuration, a signal from the transmitting section 31 of the cordless telephone 50 is received by the receiving antenna 20, demodulated by the receiving section 15, and transmitted via the hybrid circuit 14 and line relay 13. It is sent to the subscriber line of the telephone exchange. The line relay 13 is connected only during a call. The signal from the terminal is input to the transmitter 16 and the tone detection circuit 17 via the line relay 13 and the hybrid circuit 14, and the signal input to the transmitter 16 is converted into a transmit modulated wave and sent from the transmit antenna 20 to the telephone 20. The signal is output to the receiving section 32.

Next, mainly explaining the parts related to the present invention, when the handset 33 is not completely on-hook and the connecting device 40 detects a busy tone or howler tone from the signal from the telephone exchange, the line relay 13
At the same time, a call termination signal c is wirelessly sent from the transmitter 16 to the telephone 50, and the telephone detects the termination signal c, obtains a termination signal d, and sends it back to the connection device 40 wirelessly. The output of the transmitter 16 is cut off. Further, in the telephone set 50, the indicator 53 is activated by the signal f detected by the end of call signal c to notify the user that he has forgotten to turn on-hook or that he has not done it correctly. Please note that this indicator is just an example.
It is also not necessary to use it.

As explained above, the present invention is designed so that when a busy tone or a howler tone is detected by the connection device of a cordless telephone device connected to a terminal of a telephone exchange, the line is set to an idle state, so that the on-hook state is forgotten. This has the effect of preventing wasteful use of lines in such cases.

[Brief explanation of drawings]

FIG. 3 is a diagram showing a circuit configuration of an example. Explanation of symbols: 10 is the connection device, 13 is the line relay, 14 is the hybrid circuit, 15 is the receiver,
16 is a transmitting section, 17 is a tone detection circuit, 18 is a control section, 30 is a telephone, 31 is a transmitting section, 32 is a receiving section, 41 is a call termination signal generation section, 42 is a disconnection signal detection section, 51 is a call termination signal 52 represents a detection section, 52 represents a cutting signal generation section, and 53 represents an instruction section.

Claims (1)

[Claims] 1. Consists of a connecting device and a telephone connected to a terminal of a telephone exchange, each having a transmitting section and a receiving section, and connected to each other by a wireless line, and connecting input signals from the terminal via a line relay. In the cordless telephone device, the connection device includes a tone detection circuit that outputs a detection output when a busy tone or howler tone is detected from the input signal, and a tone detection circuit that outputs a detection output when a busy tone or a howler tone is detected from the input signal, and means for disconnecting the line relay; a call-end signal generating means for generating a call-end signal in response to the detection output and inputting it to a transmitter in the device for transmission; and a signal received by the receiver in the device. disconnection signal detection means for cutting off the output of the in-device transmitter when a disconnection signal to be described later is detected, and the telephone detects the end of call signal from the signal sent from the in-connection transmitter. A cordless telephone device characterized in that it is provided with means for inputting a signal to be transmitted as the above-mentioned disconnection signal to a transmitter in the telephone for transmission.