JPS5897947A - Contact signal transmission system - Google Patents

Abstract

PURPOSE:To reduce the number of cores of a code of a radio telephone set, etc., and to improve the operability of a handset, by sending out a contact signal on the basis of the operation detection signal of a dial switch and a clock pulse signal. CONSTITUTION:When a dial switch 12 is operated to generate a contact signal corresponding to the operation position, the generation is detected by a timing circuit 15, whose detection signal is sent out to the control circuit 36 of a base set 30. A clock pulse signal from the circuit 36 is sent out to the parallel-series converting circuit 16 of a handset 10 and each contact signal of the switch 12 while converted from parallel to series synchronously with the clock pulse signal is sent out to the circuit 36. The contact signal of a switch 11 is also sent out similarly. The circuit 36 converts each input contact signal into a digital code signal, which is sent out from a transmitter 32 to a base station through a radio circuit 4, thus obtaining a call ready state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone that connects a handset equipped with a dial switch and a base set via a cord, and particularly relates to a contact signal transmission method that allows the number of core wires of the cord to be reduced. Regarding.

2. Description of the Related Art In recent years, some wireless telephone devices have a dial switch built into a handset so that dialing operations can be performed at hand, and are further equipped with a switch corresponding to a hook switch.

FIG. 1 shows an example of the configuration of this type of telephone.

In the figure, this telephone includes a switch 11 corresponding to the hook switch of handset 1 and a dial switch 1.
Each contact signal output from 2 (3x4 matrix configuration) is connected in parallel to the base set 3 via the cord 2t.
control circuit 31. The control circuit 31 converts each contact signal into, for example, a digital code signal, and then the transmitter 32 sends it to a base station (not shown) through the antenna S3 and the wireless line 4. The base station reproduces a digital code signal from the modulated wave, generates, for example, a two-wave parallel dial tone signal according to this reproduced signal, and sends it to the subscriber line. Further, the receiver 35 receives a modulated signal from the telephone aFi and the base station via the antenna 34 of the base set 3, reproduces the audio signal, and guides this audio signal to the receiver 13 of the handset 1 via the cord 2. , is outputting. On the other hand, the audio signal from the transmitter 14 is sent to the transmitter 32 of the base set 3 via the code 2, modulated by the transmitter s2, and sent to the base station via the antenna 33 and the radio circuit 4. ing.

Therefore, the telephone with such a configuration requires contact signal transmission of the dial switch 12 in order to connect the handset 1 and the base set 3.

7 for sending, a switch equivalent to a hook switch.

A total of 12 core wires are required, including one core wire for transmitting the contact signal of the telephone 11, and two core wires each consisting of a signal wire and a ground wire for the transmitter 14 and the receiver IJ.

For this reason, conventional telephones such as those mentioned above have various drawbacks as listed below.

(1) Since the number of core wires in cord 2 is 12, which is very large, cord 2 becomes thick and cannot be handled easily.

The operability of port 1 deteriorates. In particular, since the cord 2 is generally constructed of a curled cord, the spring force of the cord increases, and when the handset 1 is operated, the base set 3 may be pulled by the cord 2 and move, possibly causing it to fall. There is.

61) The thickening of the cord 2 is a major hindrance to miniaturizing the telephone, and is also undesirable in terms of appearance.

To eliminate each of the above-mentioned drawbacks, it is possible to make the diameter of each core wire thinner, but making it thinner not only increases the risk of wire breakage, but also increases impedance, making it easier to pick up noise. Particularly in the case of a curl cord, signal interference is likely to occur between the core and the cord, resulting in a significant drop in 87N.

The present WA was created with attention to the above circumstances, and its purpose is to improve the operability of the handset by reducing the number of core wires in the cord, contribute to the miniaturization of the telephone, and also to reduce the number of core wires in the cord. An object of the present invention is to provide a contact signal transmission method that does not cause a drop in /N.

The present invention is a dial switch (), and a comb.

If there is a switch corresponding to the parenthesis on the handset side, the operation of the switch (including this switch) is detected and a signal to that effect is sent to the base set.
It sends out the main pulse signal to the handset, converts the contact signal of the dial switch from parallel to serial at least and sends it to the base set in synchronization with the black, main pulse signal, and sends it to the base set. The output is supplied in common with the telephone receiver cord line, thereby achieving the above-mentioned purpose.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. t-@2. In Fig. 2, the same parts as in Fig. 1 are designated by the same reference numerals, and detailed explanation will be omitted.

FIG. 2 is a circuit diagram of a nine telephone set to which the contact signal transmission system of this embodiment is applied, and shows a base set 3 OK connected via a cord zOt. Nohendose.

10 is a switch (hereinafter abbreviated as a switch) 11 corresponding to the above-mentioned FU, KUSUI, and HI. dial switch 1
2. In addition to the receiver 14, there is a tie bar/gate circuit 1s and a parallel/serial converter circuit (
P/8) The establishment of J tt has become a friend. The timing circuit 15 detects the generation of each contact signal of the switch 11 and the dial switch 12 (D), and when detected, supplies a signal to that effect to the parallel/serial conversion circuit IC, and also controls the base set 300 through the code 20. The timing circuit 15 is configured, for example, by an OR circuit that receives each contact signal as input.The parallel-to-serial conversion circuit 1- also controls the base set 30, which will be described later. In synchronization with the clock t4 pulse signal sent from the circuit 3-, each of the contact signals is converted from a parallel format to a serial format and sent to the base set 30.

For example, it is composed of an 8-bit shift register circuit that inputs each contact signal in parallel.

On the other hand, the pace set 30 has a control circuit 36 having a different configuration in place of the control circuit 310 described in FIG. This control circuit 36 includes a transmitter 32 and a receiver 35.
In addition to controlling the operation of the controller, the controller also performs the following control operations. That is, (1) the tying circuit 16 of the handset 10;
When a signal indicating that the contact of the switch IJ'e1j has been operated is received from the controller, a control signal is sent to the parallel-to-serial conversion circuit 1# via the code 20.

(11) Control for inputting the serial format contact signal sent out from the parallel-to-serial conversion circuit 16, encoding this signal, converting it into, for example, a dial code signal, and then sending it out to the radio line 4 (from the transmitter 32). Note that when the transmission of this dial code signal is finished, the operation of transmitting the black and black signals is also stopped.

The base set 30 is also provided with a power supply circuit, and its output V is supplied through the cord 20 to the timing circuit 15 and parallel-to-serial conversion circuit 16 of the terminal 10.

With such a configuration, for example, when dial switch 12 is operated when making a call, and a contact signal is generated according to the operating position, the generation of this signal is detected by tying circuit 15, The signal to that effect is base set 3-
control circuit 36. For this reason, the control circuit 36 also sends the clock pulse signal to the parallel-to-serial conversion circuit 1e of the node set 10, and as a result, in synchronization with this clock pulse signal, the contact signals of the dial switch and switch 11 change from the parallel format to the clock pulse signal. It is sent to the control circuit 36 while being converted into a serial format.

At this time, the contact signal of the switch 11 is also sent out in the same way following each of the above contact signals. Therefore, the parallel series variable w
The form of the signal sent from the I& circuit 16 to the control circuit 36 is a series signal string of 8 bits and 8 pins by adding 1 bit of the switch 11 to 7 pins and 5 of the dial switch 12. When the transmission of each contact signal is completed, the control circuit 36 reads and encodes the transmitted signal, thereby converting each contact signal of the dial switch 12 and switch 11 into a digital code signal, and sends the signal to the transmitter. 32 and sends it to the base station via the wireless line 4. Therefore, as is well known from now on, the base station sends a dial tone or dial/l system to the exchange, and when the called party answers the call, the telephone becomes in a talking state.

On the other hand, for example, if the switch 1 is closed during this call, a contact signal to that effect is generated in the same way as in the case of the dial switch 12, and this is detected by the timing circuit 15, and this is detected by the p control circuit S6. The black and cutulus signals are generated from the Then, in synchronization with the black and four pulse signals, the contact signal of the switch 11 is sent out from the parallel-to-serial converter circuit 16 as one pin and one of the series eight pins and two,
Thereafter, the call is terminated by the same well-known operation as when F, C, D, which are provided in the base set so are pressed. Incidentally, as described above, in this embodiment, the dial switch is used.

Sui corresponding to Chi 12 and Fu, Kusui, Chi.

Since each contact signal generated by the cable 1 is converted from parallel format to serial format and sent to base set S0, the number of core wires of cord 20 is as follows: 0 for sending the above contact signal □ 1 wire Handset Is
, 14 □The cord 20 can be made smaller in diameter than the conventional 12 cord, so the base set 30 can be easily adjusted as the handset 10 moves, even if it is a curled cord. Inconveniences such as movement will not occur, and miniaturization of telephones will not be a major obstacle. Furthermore, since the cord 20 can be made small in diameter, there is no need to make the diameter of the core wire small, and as a result, wire breakage, noise mixing, and interference are less likely to occur.

Further, according to this embodiment, the contact signal is parallel-serial converted and sent out in synchronization with the black, shoe, and loose signals sent from the control circuit 36, so that the handset signal can be transmitted.
A stable signal sending operation can be performed without providing an oscillation source in 11 and 4I.

Moreover, since the clock/reverse signal is transmitted only when the timing circuit 16 detects the occurrence of a contact signal, the clock/reverse signal is not transmitted during a call. As a result, there will be no inconvenience that the pulse signal will leak into the line for the handset 13, 14 at code 20 and degrade the S/Nt of the call. In this example, contact signals are handled using 8 pins.
Since it can be done with a commercially available 8 pin, micro derosé for
It has the advantage that a shift register can be applied in its tt and can be constructed at low cost.

Next, another embodiment of the present invention will be described. Figure 3 shows nine professional telephones using the contact signal transmission method in the same embodiment.
FIG. In this figure, parts that are the same as those in FIGS. 1 and 2 are given the same reference numerals, and detailed explanations will be omitted.

The feature of this embodiment is the handset.

An encoding circuit 11 is newly installed in the switch 10a, and the encoder circuit 17 is equipped with a dial switch, a switch 1j, and a switch 11.
The contact signals t4 and t are encoded into digital code signals, and the digital code signals are converted into a serial format by the parallel-to-serial conversion circuit 16a and sent to the control circuit 3# of the base set 30.
The main point is to send it to 1.

Therefore, in this example, the ting times W&11m
For example, it is sufficient to simply OR the 4-bit digital code signals, and a 4-bit shift register circuit may be applied to the parallel-to-serial conversion circuit 16a, so that the circuit configuration is simplified. The contact signal to be sent out has 4 pins in series, so the transmission time is fast), and furthermore, it can avoid interference caused by the clock pulse signal within the code 20. Further, in this embodiment, when the digital code signal is introduced by the control circuit S6a, it can be sent to the υ base station by the 11 transmitter 32 without any conversion operation, so that the various effects described above can be achieved. In addition, the configuration of the control circuit can be simplified.

On the other hand, FIG. 4 is a professional configuration diagram of a telephone to which a contact signal transmission system is applied in another embodiment of the present invention. In this figure as well, the same parts as those in the previous figures are given the same reference numerals.

Now, the features of this embodiment are: Base Se, ) JO
The output V of the power supply circuit provided with bK is sent to 10b using the core wire for the receiver 13, and then sent to the encoding circuit 1.
1. Timing circuit 15a and parallel-serial conversion circuit 161
and a switching circuit 18 consisting of a transistor is provided in the supply path of this power output,
This switching circuit 18 is controlled on/off by the common contacts Jj & of the dial switch 12 and the switch 11, so that the power output is supplied only when the above-mentioned switches 12 and 11 are operated. That's the main point. In addition, in order to realize the above operation, the receiver 13
A stopping capacitor 1#a is installed in the signal line for the handset 13@ and the 35 receivers, respectively.

37m and a low-pass filter (LPF) J#b, 57b consisting of a capacitor and a resistor. The LPFs J 9 b and 37 b are provided to prevent the output of the receiver 35 from entering the power supply path of the power supply circuit, the encoding circuit 11, and the like.

With such a configuration, the power output to the terminal 10b can be reliably transmitted by sharing the signal line of the receiver 13 without providing a dedicated supply. Therefore, the core of the code tab Im! can be further reduced by one to bring the total to seven, which is even more effective in improving operability and downsizing. In this embodiment, power is supplied only when dial switch 12 and switch 11 are operated, so that the power consumption of the telephone can be significantly reduced.

In addition, the present invention covers each of the above items 1! Example Kla is not defined. For example, if the handset 10 is not provided with switches 11 corresponding to FU, KUSUI, and TI, it is sufficient to convert only the contact signals of the dial switch 12 from parallel to serial and send them out. In this case, there are 7 pits, but 8 bits and 5 bits may be transmitted using 1 bit and 5 as a dummy. In addition, various modifications may be made to the means for transmitting the contact signal, the operation detection means, the power supply means, the configuration of the control circuit, and the assignment of codes to each contact of the serial signal without departing from the gist of the present invention. Of course, it can be implemented by

As detailed above, the original t! ii detects at least the operation of the dial switch and sends a signal to that effect to the pace set, and upon the arrival of this signal, sends a signal to the pace set, and then sends a signal to the pace set. In synchronization with the signal, the contact signal of the dial switch is at least parallel-serial converted and sent to the base set, and furthermore, the power output to the handset is shared with the receiver line.

Therefore, according to the present invention, there is provided a contact signal transmission system that improves the operability of the handset by reducing the number of core wires in the cord, contributes to downsizing of the telephone, and does not reduce the 8/N ratio of calls. can do.

[Brief explanation of drawings]

Fig. 1 is a block configuration diagram of a telephone to which a conventional contact signal transmission system is applied, and Figs. 2 to 4 are block diagrams of telephones to which a contact signal transmission system is applied in different embodiments of the present invention. It is. 10.10g, 10b = Handset, 10°20
m -・-:=r-do, 30, 30*, 30b...
Base set, 11... Switch, Chi, 12... Dial switch, 15.15 &... Tizing circuit, 16°1
6m...Parallel-serial conversion circuit, 17...Encoding circuit, 1
8...Switching circuit, 19m, 31*...Storage capacitor, 19b, 37rb...LPF
. 36.36m... 1 control circuit, V... How the power supply circuit comes out.

Claims (3)

[Claims] (1) In a telephone set in which a handset equipped with at least a dial switch and a pace set as a switch is connected by a nine cord that accommodates a plurality of core wires, it is possible to detect when the dial switch is operated and an operation detecting means for sending a signal to the base set; a means for sending a black, foot and foot pulse signal to the handset when the signal arrives; t4, comprising a contact signal sending means for converting at least parallel-to-serial contact signals and sending them to the base set; and means for generating gouillage information in a predetermined form in accordance with the contact signals sent by the means.
Contact signal transmission method using I mold. (2) The contact signal transmission method according to claim s11, wherein the contact signal sending means encodes and shortens the contact signal, converts it into parallel and serial, and sends it to the base set. (3) A plurality of eight
In a telephone set connected by a cord containing a dial switch, there is an operation detecting means for detecting when a dial switch is operated and sending a signal to that effect to the base set, and an operation detecting means for detecting when the dial switch is operated and sending a signal to that effect to the base set, Yarsu signal... Ndose. a contact signal transmitting means that operates in synchronization with the black and white pulse signals and converts the contact signal of the dial switch into at least parallel to serial and transmits it to the base set; and a contact signal sent by this means. means for generating dialing information in a predetermined form according to the invention, and supplying a power output for driving at least the operation detection means and the contact signal sending means using a core lli for transmitting an audio signal to the handset of the handset. A contact signal transmission method characterized by comprising means for.