JP3031389U - Telephone number set and tone dial device - Google Patents

Abstract

(57) [Abstract] [Problem] A memory chip is required to set a telephone number, which is expensive. An apparatus for setting and tone dialing a telephone number includes a telephone number setting device (10) for generating a digital signal corresponding to a binary digit of a telephone number to be set. The tone generator (20) receives this digital signal and converts it into a predetermined number of bit groups,
Each bit group corresponds to one of the numbers in the telephone number. These bits are accessed one at a time, and a dual tone multi-frequency signal corresponding to the number represented by the accessed bits is generated in the tone generator (20) and sent to the telephone.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tone dial device for a telephone, and more particularly, to a device for connecting to a telephone to set one telephone number and performing a tone dial.

[0002]

[Prior art and problems]

 Devices for setting and tone dialing multiple telephone numbers are well known. Such devices are commonly incorporated into modern telephones. These devices allow multiple telephone numbers to be stored in the memory unit of the telephone so as to minimize the number of keys pressed to automatically dial the desired telephone number.

A pocket dial device can also be used, which has the same function as an embedded device. The advantage of pocket dial devices over embedded devices is that they are portable and can easily be plugged into another phone. Thus, the desired telephone number is stored in the memory unit of the pocket dial device, even if it is not in the memory unit of the telephone (or if the telephone does not have a memory unit). You can dial automatically by pressing one or two keys.

An object of the present invention is to provide a device which is connected to a telephone and which sets and dials one telephone number.

[0005]

[Means for Solving the Problems]

 An apparatus for setting and tone dialing one telephone number of the present invention is a telephone number setting apparatus for generating a digital signal corresponding to a binary value equivalent to the numeral of the telephone number to be set, and this digital number setting apparatus. A tone generator for receiving the signal and grouping it into a predetermined number of bits. Each bit group corresponds to one of the numbers in the telephone number. These bits are accessed one at a time, and a dual tone multifrequency signal corresponding to the number represented by the accessed bits is generated by that tone generator and provided to the telephone. A personal computer can be used for this telephone number setting device.

[0006]

[Embodiment of device]

 FIG. 1 shows an embodiment of a telephone number setting and tone dial device according to the present invention, which includes a telephone number setting device 10 and a tone generator 20.

The telephone number setting device 10 includes a plurality of combination dial wheels 11 juxtaposed to each other like a briefcase locking device. Each dial wheel 11 is divided into twelve sections 111 and corresponds to one of the numbers of the telephone number to be set (chosen from 0-9 and the symbols * and #). These dial wheels 11 are rotated so that the digits of the telephone number to be set are aligned in the proper order and are properly aligned. Each dial wheel 11 has four bit binary outputs D0-D3 corresponding to the binary value of the selected digit.

There are many ways to generate the binary outputs D0-D3. One of them is shown in FIG. The center of each dial wheel 11 is connected to a voltage source Vdd. Each section 111 of the dial wheel 11 connects to one terminal of the ground resistance. As the dial wheel 11 rotates, one of the sections 111 contacts the fixed switch pole 112. This pole 112 connects this section 111 to the power supply Vdd, thereby bringing the logic state of that section 111 from low to high. Section 111 connects to control logic circuit 113 which detects the change in this logic state and produces the desired binary output D0-D3.

The second method is shown in FIG. The center of each wheel 11 is likewise connected to a voltage source Vdd. A rotary pole 114 is electrically connected to this power supply Vdd and has four contacts a-d. A printed circuit board (PCB) is located adjacent to each dial wheel 11 and has four concentric conductive patterns C1-C4. The patterns C1-C4 are connected to one ends of the resistors r1-r4, respectively. The other terminals of the resistors r1-r4 are grounded. When the dial wheel 11 rotates, the contacts ad are electrically turned on / off with the concentric patterns C1-C4. The desired binary output D0-D3 depends on the logic state of resistors r1-r4.

In FIGS. 1 and 4, the dial wheel 11 is properly aligned to correspond to the telephone number to be set, and then the load switch 12 is operated. The binary output of the dial wheel 11 enters the 4 × N bit shift register 13 (N is the number of dial wheels 11). The operation of the load switch 12 triggers the clock generator 14 to generate 4 × N clock pulses. These clock pulses provide the clock input to shift register 13, which outputs its contents serially. The serial output Dout of the shift register 13 and the clock pulse output Cout of the clock generator 14 enter the tone generator 20.

In FIGS. 1 and 5, the tone generator 20 is arranged on one integrated circuit (IC) chip and is connected to a telephone. The tone generator 20 has a 4.times.N-bit shift register 21, which is triggered by the clock pulse output Cout to receive the output Dout of the shift register 13 in series. The data bits loaded into the shift register 21 are each made up of a group of four bits, each group corresponding to one of the digits of the telephone number to be set. Each group serves as one input of N multiplexers 22. The telephone number set device 10 can be disconnected from the tone generator 20 after Dout is loaded into the shift register 21. The device 10 is reconnected to the tone generator 20 when changing the set telephone number.

The tone generator 20 is connected to a crystal oscillator 23. The output of the oscillator 23 enters the input of the frequency divider 24 and generates an access signal of 10 Hz. This access signal is input to the N-bit trigger counter circuit 25. Each of the output pins of the trigger counter circuit 25 is connected to the enable pin (EN) of the multiplexer 22. When the trigger switch 26 of the tone generator 20 is operated, the trigger counter circuit 25 outputs an output which enables the multiplexor 22 to operate one after another. That is, only one of the multiplexers 22 can operate in one cycle of this access signal. The trigger switch 26 may be an external switch or a telephone unused pushbutton key.

In FIG. 6, the frequency output of oscillator 23 enters column divider 27 and row divider 28 to generate a dual tone multifrequency (DTMF) signal. The enabled output of multiplexer 22 enters column divisor programmable logic array 271 and row divisor programmable logic array 281 to select the proper division ratio for column and row dividers 27 and 28. Assuming that the output frequency of the oscillator 23 is 894.886 KHz and the output of the operable multiplexer 22 is 0001 (corresponding to decimal 1), the frequency of the oscillator 23 is divided by the column divider 27 into 23, The frequency is divided by the frequency divider 28 into 40 minutes. The outputs of these frequency dividers 27 and 28 are further divided by 32 and converted into a sine wave signal by sine wave generators 291 and 292 (other decimal numbers and divisors for symbols are easily determined from the above description). I won't go into detail because I can).

The output frequency of the sine wave generator 291 is 1216 Hz and that of the sine wave generator 292 is 699 Hz. These frequencies are approximately equal to the standard DTMF frequencies for decimal 1 of 1209 Hz and 697 Hz (a list of standard DTMF frequencies is readily available from various sources). The outputs of generators 291 and 292 enter operational amplifier adder 293 which receives the DT MF output from the telephone.

A feature of the present invention is that the personal computer can be programmed to generate a serial output Dout and a clock output Cout, and thus it can be used as a telephone number setting device 10. Since the operation of this embodiment when using a personal computer is almost the same, it will not be described in detail.

The present invention is easy to operate and less expensive than conventional ones because it does not use a memory chip. Thus, the present invention can be used as an inexpensive gift for customers.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a telephone number set and tone dial device according to the present invention.

FIG. 2 shows a first method of generating a binary signal corresponding to one of the digits of a telephone number to be set.

FIG. 3 shows a second method for generating a binary signal corresponding to one of the digits of the telephone number to be set.

FIG. 4 is a circuit diagram of an example of a telephone number setting device of the present invention.

FIG. 5 is a circuit diagram showing an example of a tone generator of the present invention.

FIG. 6 is a circuit diagram showing an example of a tone generator of the present invention.

[Explanation of symbols]

 10 telephone number setting device 11 dial wheel 12 load switch 13, 21 shift register 14 clock generator 20 tone generator 22 multiplexer 23 crystal oscillator 24 frequency divider 25 trigger count circuit 26 trigger switch 27 column frequency divider 28, 29 lines Circulator

Claims (3)

[Scope of utility model registration request] 1. An apparatus for setting a group of numbers and generating a dual tone, multi-frequency signal corresponding to the group of numbers, the digital signal corresponding to a binary value equivalent to the group of numbers. Digital signal generating means for receiving the digital signal, and grouping means for receiving the digital signal and grouping each into a predetermined number of bit groups corresponding to one of the numbers in the number group, which correspond to the digital signal. Said grouping means having a plurality of output bits, first shift register means for receiving this digital signal in series, and a plurality of multiplexer means for grouping said output bits into said bit group, Access means for accessing one bit group at a time, and a dual tone multi-frequency signal for generating a dual tone multi-frequency signal corresponding to the number represented by the accessed bit group. Frequency signal generating means, the digital signal generating means each being divided into a predetermined number of wheel sections and corresponding to one of the numbers in the set group and equivalent to the selected one wheel section. A group of juxtaposed combination dial wheels having an output corresponding to a binary value, a second shift register means for receiving the output of each of the dial wheels, and a second shift register means for receiving the output. Load switch means that operates, clock generating means that is triggered by the load switch means to generate a predetermined number of clock pulses,
The clock generating means for sequentially outputting the respective dial wheels by applying the clock pulse to the second shift register means. 2. The apparatus according to claim 1, wherein said digital signal generating means is a personal computer. 3. The apparatus according to claim 1, wherein said grouping means, said access means, and said dual tone multi-frequency signal generation means are integrated into one IC chip.