KR930011199B1 - Dialing circuit with a search function - Google Patents

Abstract

The circuit comprises the pulse generator; the dialing circuit having the output control unit (1), R/W counter, and buffer RAM (3); a search code counter (4b) which counts the number of the search codes and the search code control unit (4a) driving R/W counter (2); the search code comparator which generates the signal (SEG); the search coder latch outputting the telephone number information; and the buffer RAM which can memorize couple of phone numbers; and the search decoder latch (4c).

Description

Dialing Circuit with Search Function

1 is a block diagram of a circuit for writing and reading a telephone number into a buffer RAM in a conventional dialing circuit.

2 is a block diagram of a dialing circuit having a search function of the present invention.

3 is a detailed circuit diagram of the search circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Output control unit 2: R / W counter

3: Buffer RAM 4: Search circuit

4a: search control unit 4b: search code counter

4c: Search decoder latch 4d: Search code comparator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dialing circuit of a dialing telephone, and more particularly to a dialing circuit having a search function capable of selectively transmitting a plurality of telephone numbers in a redial buffer RAM. will be.

The dialing circuit of the conventional telephone is constructed as shown in FIG. Therefore, the read clock signal transmitted from the output controller 1 controls the R / W counter 2 so that the R / W counter 2 designates the address of the buffer RAM 3. ) Can only redial by remembering the last data before hooking.

That is, when the telephone number is pressed after the hooking operation, the previously stored telephone number is extinguished, and only the newly input telephone number is stored in the buffer RAM 3. Therefore, in any case, there is only one telephone number stored in the buffer RAM 3. Therefore, even in the local telephones using relatively short telephone numbers of three to four digits, as described above, only one telephone number is stored in the buffer RAM regardless of the number of digits of the number. There was a defect that could not be utilized.

The present invention has been invented to eliminate the shortcomings of the dialing circuit of the conventional telephone, and to store a plurality of telephone numbers within the capacity range of the buffer RAM to selectively transmit the stored telephone numbers according to the input order. It is an object of the present invention to provide a dialing circuit having a search function capable of making a phone call without having to press a phone number of multiple subscribers every time by having the same effect as a memory phone when using a general telephone rather than a memory telephone.

The dial circuit having the search function of the present invention for achieving the above object is a dialing circuit having a pulse generator, a memory latch and decoder, an output control unit 1, an R / W counter 2 and a buffer RAM 3. A search control unit 4a for operating the R / W counter 2 in accordance with the read clock signal and the output adjustment signal, a search code counter 4b for counting the number of search codes, and information on a plurality of dialed telephone numbers; The search circuit 4 is composed of a search decoder latch 4c and a search code comparator 4d for generating a signal, and the R / W counter 2 is controlled to control a plurality of telephone numbers in the buffer RAM 3. It can be remembered to dial.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation and effect of the present invention.

2 is a block diagram of a dialing circuit having a search function of the present invention, and FIG. 3 is a detailed circuit diagram and a key matrix of the search circuit 4, and the search controller 4a of the search circuit 4 is shown in FIG. 3B. As shown, a plurality of inverters, noah gates, and NAND gates, and the search code counter 4b includes an inverter, a noah gate, a NAND gate, and a T flip-flop (TFF ₁ to TFF) as shown in FIG. ₄ ), the search decoder latch 4c is composed of a plurality of flip-flops as shown in FIG. 3e, and the search code comparator 4d is composed of an exclusive oragate as shown in FIG. 3f. It consists of a noah gate and inverters.

Figure 3a shows the key matrix of the telephone employed in the present invention. When the search key (SE) is pressed between the telephone number and the telephone number by adding a new key called search key (SE) to the conventional telephone IC keyboard, the telephone number is entered. In case of transmitting the stored phone number which can be memorized continuously, press the search key (SE) and the number key (i) (i = 1,2,…, 0) according to the input order. Will be. Eventually, only one of the stored phone numbers can be selectively transmitted, which can serve as a memory phone.

In the conventional dialer IC, the dialing stops and starts is controlled by the signal EQ, which becomes a high level signal when the state of the lead address counter and the light address counter is the same. ) And signal (SEQ).

In the present invention, the search code counter 4b, the search decoder latch 4c, the surrender code comparator 4d, and the like are added in order to determine a plurality of serializers. The basic operations are as follows.

EXAMPLE

The search control unit 4a has the configuration shown in FIG. 3b, and the input signal iSE becomes a high level when the search key SE of the key matrix is first pressed, and the signal soj is a numeric key or a function of the key matrix. When one of the keys is pressed, the signal is in the high level only once after a certain time, and the signal is in the high level state upon hooking the handset of the telephone. When the state of the write address counter is the same, the signal goes into high level, the signal NK becomes the high level when the numeric key is pressed, and the signal PDK becomes the high level when the redial key RD is pressed. It is a signal. In addition, the signal Flash becomes a high level state when the flash key F is pressed, and the signal POR becomes a high level state when the pause key P is pressed. By the input signals, the search controller 4a outputs the latch clock signal and the signal RCK-EN to the search decoder.

First, pick up the handset of the phone, dial the number key '1', '2', '3' and press the search key (SE). The search key (SE) code is input to the buffer RAM (3). Will be However, the R / W counter 2 is not reset.

If you press the number key '4' '5' '6' and make a call, the buffer RAM (3) is written with 7 data of 1, 2, 3, SE, 4, 5, 6, and then the search key (SE Press () to input the search key (SE) code for automatic hooking operation.

Thus if '1' '2' 3 '; 'Zi' 'Zi' 'Zi'; 'SE'; '4' '5' '6'; 'Zi' 'Zi' 'Zi'; 'SE'; '7' 8 '9'; If you press the key in order of 'Zi', 'Zi', 'Zi' (where Zi indicates call status), the data of 1 2 3 SE 4 5 6 SE 7 8 9 is written to the buffer RAM (3). Three telephone numbers are memorized.

As shown in FIG. 3C, the output signal RCK is output through the NAGGATE and the inverter sequentially by the input signal OPEND, which becomes a high level when the operation on the input signal RCK-EN and data is completed. The output adjustment clock signal is a signal output by the input signal EQ and the input signal SEQ via the inverter through the NOA gate, and a signal lmit and the signal RCK indicating the initial state through the inverter. The gate and the inverter are signals that are sequentially output.

On the other hand, the search code counter 4b configured as shown in FIG. 3b is configured to connect the NAND gate and the inverter of the read address counter clock input signal RCK and the search code input signal SEC, which are output signals of the read address counter. After going through it in sequence, it is input to the C stage of the serially arranged first toggle flip-flop TFF1, and the input signal Flash by the flash key, the input signal POR by the pause key, and the input signal (ON) After the input signal iSE passes through the NOR gate and the inverter frame sequentially, the input signal iSE is inputted in parallel to the R stage of the toggle flip-flop TFF disposed serially, and the signal SO ₀ is applied to the Q stage of the first TFF. In addition, the signal SQ ₀ is input to the C terminal of the second TFF TFF2 and the signal SQ ₁ is outputted as described above, and the signal SQ ₂ and the signal SQ ₃ are respectively provided to the TFF3 and the TFF4. ) Is printed.

The search decoder latch 4c configured as shown in FIG. 3e has an input part I ₀ to receiving a numeric key after the search key SE as an input signal of each flip-flop during a search call. I ₃ ) and the search decoder latch clock are inputted in parallel to the output signal (DQ ₀ ~ ~) which is in the state of ＂I＂ for each unit number of the corresponding numeric key and ＂0＂ in the remaining numbers. DQ ₃ ) is output.

The search code comparator 4d constructed as shown in FIG. 3f is composed of the input signals DQ ₀ (SQ ₀ ), (DQ ₁ ) (SQ ₁ ), (DQ ₂ ) (SQ ₂ ), and (DQ ₃ ) ( Each signal of the X-OR (excusive OR) gate output by SQ ₃ ) is the input signal of the NOR gate, and when the redial key and the output signal are pressed, the state of high level is transmitted during the data transmission period. The holding input signal RD-EN sequentially outputs the output signal SEQ through the NOA gate and the inverter. Therefore, the user dials the '1''2''3' key after turning ON and presses the search (SE) after entering the 'SE' code into the display (3). And automatic hooking. However, the read / write count is not reset.

When you finish the conversation with the caller by pressing the '4' '5' '6' key again and press the 'SE' key, 7 data of 1 2 3 SE 4 5 6 are written to the buffer RAM (3). Finally, 'SE' code is inputted and automatically hooked. Then, when you finish the conversation with the caller by pressing the '7' '8' '9' key, the data of 1 2 3 SE 4 5 6 SE 7 8 9 is written into the buffer RAM (3) and the three phone numbers are memorized. .

In this state, after the user hooks up, that is, when the user picks up the handset and presses the redial (RD) key once, the first telephone number 123 is outputted to make a call. Pressing the RD key once again automatically hooks the second phone number 456 to allow the user to make a call. When the RD key is pressed once again, the third telephone number 789 is output after the automatic hooking.

Therefore, the RD key causes the buffer RAM 3 to start dialing from the beginning until the SE code or EQ occurs, and wait for the next phone number after completing the dialing. When the 'RD' key is pressed again, the standby phone numbers are sent out sequentially. However, the "RD" key is not operated continuously.

The phone number stored in the buffer RAM 3 can be dialed by sequentially turning on and off hooking by sequentially pressing the search key SE and the 'number' key. That is, the search decoder latch is coded by the numeric key next to the search key SE, and the telephone number is output and dialed when the coding data and the data of the search code counter which is the output number of the 'SE' code match.

For example, when the search key SE and the numeric key '1' are pressed in sequence, the outputs DQ ₀ to SO ₃ of the search decoder latch 4c are all 0, and the outputs SQ ₀ to S of the search code counter 4b. SQ ₃ ) is also 0, and SEQ, the output of the search code comparator 4d, becomes active, and the data of the number # 1,2,3, which is stored for the first time by the buffer RAM 3, is output. , 2, 3 'is dialed.

The above operation is called a search call, and the search key SE is not continuously operated like the redialing key RD. After hooking, the first search key SE activates the search call, and after executing the search call, the cascade does not operate.

Likewise, if the number key '2' is pressed after the search key SE, the second stored phone number '4, 5, 6' is dialed.

As described above, the present invention can efficiently store a plurality of phone numbers with fewer digits by efficiently using a buffer RAM, and select and transmit a desired phone number, thereby obtaining a function of a memory dialer without having a separate memory device. There is this.

Claims (1)

A dialing circuit comprising a pulse generator, a memory latch and decoder, an output control unit 1, an R / W counter 2 and a blower 3, in which a R / W counter is formed according to a read clock signal and an output adjustment signal. 2) a search control unit 4a for operating the search, a search code counter 4b for counting the number of search codes, a search decoder latch 4c for outputting information of a plurality of dialed telephone numbers, and a search for generating a signal SEQ; Search function characterized in that a coder comparator 4d is configured for the search circuit 4 to control the R / W counter 2 to store and dial a number of telephone numbers in the buffer RAM 3. Dialing circuit having a.