JPH04358459A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To obtain a simple security equipment by providing an exclusive alarm informing function to a master device and a slave device respectively. CONSTITUTION:Each of a master device 21 and a slave device 51 of 8 cordless telephone set is provided with an exclusive radio transmitter/receiver 8, an imitation sound generating circuit 7, a voice processing circuit 4, and a system control circuit 25. Then an emergency alarm switch 22 and an emergency lamp 23 are provided to both devices 21 and 51 respectively. A carrier sense 61d is added to a control channel of the calling side in the circuit connection procedure, and an emergency alarm is informed. Therefore the distant side can be immediately called in an emergency of not only a talking function but the device 21 or 51.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone having a base unit and a slave unit each equipped with a wireless transmitter/receiver.

0002

2. Description of the Related Art In recent years, various types of telephones have become available, and among them, cordless telephones are becoming increasingly popular due to their convenience. However, there is an increasing demand for not only using it as a telephone, but also making it more convenient by taking advantage of its cordless function.

Next, the conventional technology will be explained using the drawings.

FIG. 5 shows a block diagram of the main unit side of a cordless telephone according to the prior art.

[0005] A base unit (1) is connected to a public telephone line (2). The configuration of the parent device (1) is as follows. The telephone line control unit (3) interfaces between the public telephone line (2) and a voice processing circuit (4) to be described later. An audio processing circuit (4) that processes audio signals is configured to send and receive signals to and from a telephone line control unit (3). The control circuit (5) exchanges signals with the telephone line control section (3) and the voice processing circuit (4). The key switch (6) transmits dial information and other information to the control circuit (5). The onomatopoeia generating circuit (7) is a control circuit (
5) and is connected to the audio processing circuit (4). The radio transceiver (8) includes an audio processing circuit (4)
It exchanges signals with the control circuit (5) and exchanges signals with the handset, which will be described later, via the antenna (9). The transmitter/receiver section (10) consists of a transmitter section (10a) and a receiver section (10b). The transmitting unit (10a) is connected to the audio processing circuit (4) via the transmitting amplifier (11), and the receiving unit (10b) is also connected to the audio processing circuit (4) via the receiving amplifier (12). Ru. Hook switch (13)
is connected to the control circuit (5) to transmit ON/OFF information of the handset/receiver (10). A loudspeaker (14) is connected to an audio processing circuit (4) via a loudspeaker amplifier (15).

Next, the slave unit will be explained. FIG. 6 is a block diagram of the handset side.

The slave unit (31) has a configuration similar to that of the base unit (1), and will therefore be briefly described. This device includes an audio processing circuit (34), a control circuit (35), and a key switch (3).
6), an onomatopoeia generating circuit (37), and each base unit (1
) are connected in the same way. The radio transmitter/receiver (38) has an audio processing circuit (34) and a control circuit (35) similar to the base unit (1).
), and transmits and receives signals to and from the base unit (1) via the antenna (39). Transceiver part (40
) consists of a transmitting section (40a) and a receiving section (40b), and is connected to a transmitting amplifier (41) and a receiving amplifier (42). In addition, the loudspeaker (44) is a loudspeaker amplifier (45)
It is connected to the. All of these are connected in the same way as each component in the base unit (1).

Next, the operation will be explained. First, Figure 5
The base unit (1) will be explained using the following.

Upon receiving dial information from the key switch (6), a signal is sent from the control circuit (5) to the onomatopoeia generating circuit (7). As a result, a predetermined signal is output from the onomatopoeia generating circuit (7), subjected to audio processing by the audio processing circuit (4), and sound is emitted from the loudspeaker (14). On the other hand, the dial information is transmitted from the control circuit (5) to the telephone line control section (
3), and the line is connected to the other party through the public telephone line (2). After the line is connected, the audio signal from the transmitting unit (10a) of the transmitting/receiving unit (10) is processed by the audio processing circuit (4) and sent to the telephone line control unit (3).
The voice from the other party is processed by the voice processing circuit (4) via the telephone line control section (3), and then reaches the user's ear from the receiving section (10b).

Next, the handset (21) side will be explained using FIG.

Similar to the base unit (1), the key switch (36)
The information on the dial operation is announced from the control circuit (35) via the onomatopoeia generating circuit (37) and the voice processing circuit (34) through the loudspeaker (44), and the wireless transmitter/receiver (
38) to the antenna (39) of the handset (31),
The wireless transmitter/receiver (8) is connected via the antenna (9) of the base unit (1).
), where the audio signal is processed such as demodulation. As a result, a connection is established with the other party through the telephone line control unit (3), and the voice from the transmitting unit (40a) of the handset (31) is sent to the other party, and the voice of the other party is transmitted to the receiving unit (40b). You can hear it with your ears.

Next, the frequency band of the wireless carrier used in the wireless transceiver will be explained. FIG. 3 is an explanatory diagram for explaining frequency bands.

In FIG. 3, the wireless carrier for the handset and the wireless carrier for the base are determined by rules. In other words, the frequency band for the handset is 253.8625MHz ~
254.9625MHz is divided into 89 channels at 12.5kHz intervals, of which the 46th channel (254.425MHz) and the 89th channel (254.
．． 9625 MHz) are assigned to the control channels. On the other hand, the frequency band for the base unit is 380.212
5MHz to 381.3125MHz, and similarly 12
．． It is divided into 89 channels at 5KHz intervals. Of these, the 46th channel (380.775MHz)
and the 89th channel (381.3125 MHz) are assigned as control channels.

Note that 87 channels, excluding the two control channels mentioned above, are allocated as communication channels.

FIG. 7 is a flowchart showing an example of a line connection procedure.

In FIG. 7, the calling station and the called station may be, for example, between a base unit and a slave unit, or may be between a base unit or a slave unit and another base unit or slave unit.

The calling station (61) and the called station (62) each have a control channel and a communication channel. Initially, both the calling station (61) and the called station (62) are in a standby state (states (61a) and (62a) in FIG. 4). Here, when the calling station (61) makes a call (61b) to call the other party, carrier sensing is performed on the communication channel of the calling station (61) in response to a calling command. (Carrier sense is used to detect whether the electric field strength of the channel you are trying to use is below a predetermined level in order to prevent interference with channels used by other cordless phones in the vicinity.) (This is the state shown in (61c) in Figure 4.) After carrying out the carrier sense of the communication channel,
A control signal is transmitted (61e) to transmit a connection request and a communication channel designation signal to the called station (62). Most of the operations so far have been performed on the control channel (channel 46 or channel 89) of the calling station (61), which is determined by rules.

When a control signal is transmitted from the calling station (61), the control channel on the called station (62) side receives the control signal (62b), and this signal causes the called station (62) to make a call. Carrier sense of the call channel specified by the station side (
62c), and then transmits a control signal for a connection permission response to the calling station (61) (62d). Calling station (6
1) receives this control signal (61f), the calling station (
61) and the called station (62) begin communication transmission and reception ((61g) and (62e)). When the mutual communication is completed, the transmission of radio waves will stop due to a line release signal from either side (6
1h), and both the calling station (61) and the called station (62) return to the standby state ((61i) and (62f)).

[0019]

[Problems to be Solved by the Invention] As mentioned above, conventional cordless telephones are equipped with a radio transmitter/receiver.
Although it was possible to send and receive calls between the base unit and the handset, it did not have any other functions. Therefore, even if an emergency occurs, you can first call the handset from the base unit (or vice versa), confirm that the handset answers the phone, and then inform the other party of the emergency situation, which is extremely convenient. The problem was that there was no other way to do it.

The present invention was made to solve the above-mentioned problems, and by providing a dedicated alarm notification function to each of the base unit and slave unit, it can be used as a simple security device. The purpose is to provide cordless telephones.

[0021]

[Means for Solving the Problems] In order to achieve the above object, the cordless telephone of the present invention has a base unit and a handset each equipped with a dedicated wireless transceiver. Each of the emergency call switches is equipped with an emergency call switch and an alarm notification means that operates in response to the operation of the call switch.

[0022]

[Operation] According to the above configuration, when an emergency situation occurs, by pressing the call switch of the base unit or slave unit, the slave unit or base unit emits an alarm sound and at the same time turns on the alarm lamp, thereby providing an audible sound. Emergency situations can also be visually recognized.

[0023]

[Embodiment] An embodiment of the present invention will be described below. Note that components having the same configuration as those of the prior art are given the same numbers and the description thereof will be omitted.

FIG. 1 shows a block diagram of a base unit according to an embodiment of the present invention.

The connection between the public telephone line (2) and the telephone line control section (3) of the base unit (21) to make a call is exactly the same as in the conventional example shown in FIG. The present invention further includes an alarm notification function, the configuration of which will be explained next.

The control circuit (25) includes an emergency alarm switch (25) which is operated by operating an emergency alarm button.
2) is connected, and an emergency lamp is also connected so that it can be turned on in an emergency. Resistor for current control (
24) has one end connected to an emergency lamp (23) and the other end connected to a control circuit (25). The control circuit (25) performs system control during a call in the same manner as in the prior art, but also controls alarm notification in the event of an emergency.

Next, the configuration of the handset side will be explained.

FIG. 2 shows a block diagram of the handset side, and since it is completely the same as the prior art regarding telephone calls, the same numbers as in FIG. 6 will be used and the explanation will be omitted. Furthermore, since the emergency alarm function is basically the same as the configuration of the base unit in FIG. 1, it will be briefly explained.

[0029] A handset (51) having a wireless transceiver (38)
) is the emergency alarm switch (52) in addition to the configuration during calls.
, an emergency lamp (53), a current control resistor (54), a control circuit (55) that also performs emergency alarm notification control, and the like.

Next, the operation will be explained. In the explanation, for example, a method will be described in which an emergency situation occurs on the base unit side and the emergency situation is transmitted to the slave unit side, but it is of course possible to transmit the information from the slave unit to the base unit.

In FIG. 1, an emergency situation occurs and the main unit (2
1) When the emergency button (not shown) is pressed, the emergency alarm switch (22) operates, and the signal is sent to the control circuit (25).
) is input. As a result, a lamp lighting signal is issued from the control circuit (25) via the current control resistor (24), and the emergency lamp (23) is turned on. At the same time, when a signal is transmitted from the control circuit (25) to the onomatopoeic sound generating circuit (7), an alarm sound signal is generated from the onomatopoeic sound generating circuit (7). This alarm sound signal is subjected to audio processing in the audio processing circuit (4), output to the loudspeaker amplifier (15), and then output to the loudspeaker (
14) will emit an alarm sound.

On the other hand, the alarm sound signal is subjected to audio processing in the audio processing circuit (4) and then outputted to the wireless transmitter/receiver (8). Here, the frequency is modulated by the wireless carrier and the antenna (9
) emits radio waves as an alarm sound signal.

Radio waves emitted from the antenna (9) of the base unit (21) are received by the antenna (39) of the slave unit (51) in FIG. 2, demodulated by the wireless transceiver (38), and sent to the audio processing circuit ( 34). Then, the sound is processed by the sound processing circuit (34), amplified by the loudspeaker amplifier (45), and emitted as an alarm sound signal from the loudspeaker (44). On the other hand, before the alarm sound signal is transmitted to the loudspeaker (44), a control signal indicating transition to alarm operation is demodulated by the wireless transceiver (38) and transmitted to the control circuit (55). 55) performs system control and also controls the emergency lamp (54) via the current control resistor (54).
53) to notify the base unit (21) that an emergency has occurred.

Next, the line connection procedure at the time of emergency alarm will be explained. FIG. 4 is a flowchart showing the line connection procedure. The flow in FIG. 4 is almost the same as that in FIG. 7, but the difference is that carrier sensing (61d) is performed on the control channel side of the calling station (61). That is, during a normal call, radio waves are emitted after confirming that the control channel is free, so if there is no free space, the control channel is automatically stopped after checking for free space several times. However, if the system automatically stops in the event of an emergency alarm, the function will not be effective, so carrier sense is performed as many times as necessary until the control channel becomes free, without having to press the button many times. Then, if one control channel (for example, channel 46) is in use, the other control channel (for example, channel 89) is used for transmission, etc., and processing is performed on the software until the emergency button is released. Repeat the action.

That is, to briefly explain using FIG. 4,
When the emergency button of the calling station (61), which is the base unit (21), is pressed and the emergency alarm switch (22) is activated, a signal a is generated at the calling station (61), and the calling station ( Carrier sensing (61d) is performed on the control channel of 61). This carrier sense allows you to check available channels and send connection request control signals without having to press the button many times (61
The called station (62) performs e) and receives it (62b)
The emergency lamps are turned on by the signal from the control channel. If the calling station (61) makes a call (61b) in this state, a control signal specifying the call channel is sent (61e).
) is received by the called station (62) as a control signal (62b), after which a call is made in the manner described in FIG. 7 of the prior art. Of course, in the worst case, even if there is no call, if the emergency alarm switch is activated, the emergency alarm of the called station (62) will sound and the emergency lamp will light up.

[0036]

[Effects of the Invention] As explained above, according to the present invention,
We added an emergency alarm switch and lamp to each of the base unit and slave unit, and added a line connection control procedure specifically for emergencies.
If an emergency occurs on either the base unit or the slave unit, an emergency signal can be immediately sent to the other side. Therefore, the cordless telephone can not only be used as a simple transmitter/receiver, but also have a function as a simple security device, and can achieve great effects such as improving the product appeal of the telephone.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a base unit of a cordless telephone according to the present invention.

FIG. 2 is a block diagram of a handset of the cordless telephone according to the present invention.

FIG. 3 is an explanatory diagram of frequency bands of wireless carriers used in a wireless transceiver.

FIG. 4 is a flowchart of a line connection procedure according to the present invention.

FIG. 5 is a block diagram of a base unit of a cordless telephone in the prior art.

FIG. 6 is a block diagram of a handset of a cordless telephone in the prior art.

FIG. 7 is a flowchart of a conventional line connection procedure.

[Explanation of symbols]

(2) Public telephone circuit (3) Telephone line control unit (4), (34) Voice processing circuit (7), (37) Onomatopoeia generating circuit (8), (38) Wireless transceiver (9), (39) Antenna (10), (40) Transceiver unit (14), (44) Loudspeaker (21) Base unit (22), (52) Emergency alarm switch (23), (
53) Emergency lamp (24), (54) Current control resistor (25), (5
5) Control circuit (51) Handset (61) Calling station (62) Called station

Claims (1)

[Claims] Claim 1: A cordless telephone comprising a base unit and a slave unit, each of which is equipped with at least a dedicated wireless transmitter/receiver, wherein each of the base unit and the slave unit is provided with a dedicated wireless transmitter/receiver. a call switch, and an alarm notification means that operates in response to the operation of the call switch, and in an emergency, when the call switch of the base unit or the slave unit is operated, the slave unit or the base unit issues an alarm. A cordless telephone characterized by: