CN2426253Y - Telephone set with key value analysis device - Google Patents

Abstract

The utility model relates to a telephone set with a key value analysis device. The utility model comprises a set of keyboard, a dialing chip corresponding to the keyboard and a microprocessor used for receiving the operation information form the keyboard. Particularly, the utility model is provided with a key value analysis device which comprises a DTMF receiving chip connected with the dialing chip for decoding signals from the dialing chip. A bus buffer is connected with the DTMF signal receiving chip for transmitting the demoded signals of the DTMF signal receiving chip and mute signals generated by the dialing chip to the microprocessor. Therefore, the pins of a single chip computer used by the telephone set of the utility model have small area occupation, and extension is convenient.

Description

A kind of telephone set with key assignments resolver

The utility model relates to a kind of telephone set, relates in particular to a kind of telephone set with key assignments resolver.

Up at present, all be provided with single-chip microcomputer (microprocessor) system in the telephone set of being used widely.In order to make the operating state of Single Chip Microcomputer (SCM) system control telephone set, and to the telephone set input signal, telephone set system is provided with button or keyboard, comprises numerical key family or function key family etc.Except reset key had special reset circuit and reset function, other button or keyboard all were with on off state controlled function or input data to be set in the keyboard of existing telephone set.

At present common telephone keyboard input circuit is divided into two kinds of free-standing press-key structure and determinant press-key structures on the structure substantially.

So-called free-standing press-key structure is meant the single key circuit that direct I/O constitutes, and promptly each free-standing button takies an I/O port lines separately, and the operating state of button can not influence the operating state of other I/O port lines on every I/O port lines.Stand alone type key circuit flexible configuration, software configuration is simple, but each button must take an I/O port, and more for a long time, the waste of I/O port is bigger in telephone key quantity, increases the complete machine cost of telephone set.Thereby free-standing press-key structure suits not adopt for a long time in the number of keys of telephone set.

So-called determinant keyboard claims matrix keyboard again, is to utilize the I/O port lines to form row-column structure, and the button setting is expert on the intersection point with row.For example can constitute the keyboard of 4 keys with the row-column structure of 2X2, the row-column configuration of 4X4 can constitute the keyboard of 16 keys.Therefore, more for a long time, can save the I/O port lines in a large number, reduce the cost of telephone set in the number of keys of telephone set.

When using the input structure of this matrix keyboard, the row, column line need be connected respectively to the two ends of key switch.When line connects positive source by pull-up resistor, be clamped at high level state.When having or not button to press in needs are judged keyboard, when promptly needing to resolve key assignments, system sends into the full scan word by alignment, and reads in capable state by line and judge.Its method is: all be set to low level for all I/O lines of alignment, then with in the line level state reading into the microprocessor.If there is key to press, always have a line level and be pulled to low level, be not 1 entirely thereby make the row input.

To press be after putting low level by alignment by row, to check the row input state to which key in the keyboard.Its method is: send low level to alignment successively, look into all line states then, if be 1 entirely, then the key of being pressed is within the rule.If be not 1 entirely, then the key of pressing must be listed as at this.And be that key on the intersection point that intersects with 0 level line.

Each key on the keyboard all has a key assignments.The most direct way of key assignments assignment is that the row, column line is arranged by binary sequence, and when a certain key was pressed, the keyboard scan program was carried out to these row and put 0 level, and reading each row state is non-complete 1 state, and row, column data set at this moment synthesizes key assignments.

In scm application system, keyboard scan is one of work of microprocessor (CPU).How microprocessor takes into account keyboard scan when other work of processing, guarantee response key operation in time, exceed again to take microprocessor time and resource, and be the problem that all system designers at first should be considered.

At present, telephone set has been applied in various places, as office or family place etc., because the needs of traversing space-time, people are more and more higher to the functional requirement of telephone set, have various functions adapting to the telephone set of modern life rhythm, arrive as confused pile such as video telephone.The enhancing of telephone functionality need increase number of keys, needs to improve the configuration of microprocessor simultaneously, to handle more work.The keyboard input pattern of existing telephone machine if do not upgrade microprocessor, can't increase more I/O interface line, thereby can not adapt to the requirement of multi-feature telephone under the many situations of button on the basis of original microprocessor processes ability.And the upgrading microprocessor will increase considerably the complete machine cost of telephone set, makes costing an arm and a leg of telephone set, can't satisfy the demand of domestic consumer.

Above-mentioned deficiency at prior art, main purpose of the present utility model is to propose a kind of telephone set with key assignments resolver, under the complete machine condition of cost of not obvious increase telephone set, by increasing a key assignments analysis circuit, simplified the key assignments coding, both satisfied the requirement of many push-button telephones, reduced the configuration of Single Chip Microcomputer (SCM) system simultaneously effectively, saved taking mcu resource.

The utility model is achieved through the following technical solutions:

A kind of telephone set with key assignments analytical equipment comprises some keyboard matrixs; Some dialing chips are connected with described keyboard matrix respectively; And microprocessor, receiving operation information from described keyboard matrix, wherein said telephone set is provided with a key assignments resolver, and this key assignments resolver comprises

At least one touch-tone signal receiving chip is connected with described some dialing chips, and signal from described dialing chip is used to decode;

At least one bus buffer is connected with described touch-tone signal receiving chip, is used to transmit the signal of described touch-tone signal receiving chip decoding and mute signal that described dialing chip sends to described microprocessor.

Described telephone set, wherein said keyboard are divided into number generator matrix and function keyboard matrix.

Described telephone set is provided with a upturning key button in the described function keyboard matrix of wherein said telephone set, is used for upwards query display information; Turn over key button once, be used for downward query display information.

Described telephone set is provided with one and confirms key button in the described function keyboard matrix of wherein said telephone set.

Described telephone set is provided with a cancellation key button in the described function keyboard matrix of wherein said telephone set.

Described telephone set is provided with a quickflashing key button in the described function keyboard matrix of wherein said telephone set.

Described telephone set, wherein said dialing chip is 9102D.

Described telephone set, wherein said touch-tone signal receiving chip is 74HCT244.

Described telephone set, wherein said processor controls are HM9270D.

According to an aspect of the present utility model, the input of the keyboard of telephone set of the present utility model realizes by an interruption and an I/O address, so the pin of single-chip microcomputer takies less in the utility model telephone set, expands very convenient.

According to another aspect of the present utility model, because the key assignments resolver of the utility model telephone set adopts the congenerous chip that uses in enormous quantities, its cost is very low, simultaneously because the area that chip disperses, each chip takies is little, brings a lot of convenience for printed circuit board, fabric swatch.

According to another aspect of the present utility model, owing to utilize telephone set dialing chip to convert push button signalling to the standard DTMF sign indicating number, when single-chip microcomputer receives push button signalling, directly obtain the key assignments of button by the DTMF decoding chip, saved taking like this to mcu resource.

Telephone set described in the utility model is described in conjunction with preferred embodiment of the present utility model below in conjunction with accompanying drawing:

Fig. 1 is the modular structure block diagram of existing telephone switch dish;

Fig. 2 is the keyboard input service flow chart of existing telephone machine shown in Figure 1;

Fig. 3 is the modular structure block diagram of the utility model keyboard;

Fig. 4 is a keyboard input service flow chart of the present utility model;

Fig. 5 is a preferred embodiment of key assignments process of analysis of the present utility model;

Fig. 6 is the circuit connection diagram of telephone set of the present utility model.

Fig. 1 is that existing telephone switch dish input module constitutes block diagram, and whole keyboard input module is made up of matrix keyboard (abbreviation keyboard matrix) 1, dialing chip 2, microprocessor 3, conversation chip 4, the chip 4 that wherein dials generally be embedded in microprocessor 3 in.Its operation principle is with reference to flow chart shown in Figure 2, during arbitrary key in pressing keyboard matrix, the dialing chip can send corresponding Dual Tone Multifrequency signal and one quiet (MUTE) signal, the conversation chip will be opened the dtmf signal passage, sends on the telephone wire after the signal that the dialing chip sends amplifies by the conversation chip.

As shown in Figure 3 be that the Keysheet module of telephone set of the present utility model constitutes, for the enhancing of the satisfying telephone functionality requirement to number of keys, telephone set of the present utility model has adopted two keyboard matrixs, has adopted two dialing chips accordingly.Certainly, along with the increase of telephone key can corresponding as required increase keyboard matrix and dialing chip.

As shown in Figure 3, the Keysheet module of telephone set of the present utility model is by keyboard matrix 1, keyboard matrix 2, the dialing chip 3 that links to each other with keyboard matrix 1, the dialing chip 4 that links to each other with keyboard matrix 2, key assignments resolver 5, microprocessor 8, conversation chip 9.Wherein keyboard resolver 5 comprises DTMF receiving chip 6 and bus buffer 7, receives the dtmf signal from this dialing chip 3 and 4, carries out key assignments and resolves, and the key assignments after resolving is passed to microprocessor 8 handle.Because the DTMF sign indicating number can be represented 0-F totally ten six press keys, available tetrad data are represented, and single-chip microcomputer is an eight bit data bus formation, is the DTMF sign indicating number which piece dialing chip produces so can utilize other tetrad data line to distinguish.

Workflow as shown in Figure 5, when pressing arbitrary key of keyboard matrix 1 or 2 (step S100), corresponding dialing chip 3 or 4 is sending dtmf signal (step S102) and MUTE signal (step S108), DTMF receiving chip 6 decode after receiving this dtmf signal (step S104), the signal that decoding is come out by DTMF receiving chip 6 outputs to bus buffer 7 with the form of tetrad, sends interrupt signal (step S106) to microprocessor 8 simultaneously; The MUTE signal that dialing chip 3 or 4 sends is to bus buffer 7.Microprocessor 7 carries out interrupt response according to the signal that receives from bus buffer 7, and read 4 DTMF sign indicating numbers and MUTE signal (step S110) from the output of bus buffer 7, according to the MUTE signal identification that receives is which sheet dialing chip 3 or 4 has sent signal, and then analyze the implication (step S112) of the key representative of pressing, thereby determine which key is pressed according to 4 DTMF sign indicating numbers.

If with the digital " 0 " key is that example illustrates whole workflow, referring to Fig. 5, when numerical key " 0 " key is pressed, corresponding dialing chip 3 can send dtmf signal and the MUTE signal of being made up of 941Hz and 1336Hz, the MUTE signal is directly delivered to bus buffer, in bus buffer D4 input input " 1 ".Dtmf signal to bus buffer D3-D0 input binary load certificate " 1010 ", and sends interrupt signal after 6 decodings of DTMF chip.Microprocessor 8 carries out interrupt response and can receive the binary system code value of " 00011010 ", is pressed thereby judge " 0 " key.

Telephone functionality of the present utility model is complete, needs 22 buttons altogether.The circuit connection diagram of its finger-impu system as shown in Figure 6.As seen from Figure 6, " 0～9 " numerical key and " # " reach " * " and have formed a keyboard matrix, and function key, as above turn over key button (PAGEUP), downturning key button (PAGEDOWN), menu key button " MENU ", redial key button " REDIAL ", quickflashing key button " FLASH ", hands-free key button " HANDFREE ", confirm key button " OK ", cancellation key button " CANCEL ", quiet key button " MUTE " and HOLD key button etc., formed another keyboard matrix.The dialing chip 3 that links to each other with these two keyboard matrixs 1 or 2 or 4 adopts the chip of HM9102D or other identical functions.Dtmf signal by dialing chip 3 or 4 outputs is received chip HM9270D reception, gives described processor controls 89C52 at last.

Native system uses through actual, proves pratical and feasible and respond well.

Claims (9)

1, a kind of telephone set with key assignments analytical equipment comprises some keyboard matrixs; Some dialing chips are connected with described keyboard matrix respectively; And microprocessor, receive operation information from described keyboard matrix, it is characterized in that: described telephone set is provided with a key assignments resolver, and this key assignments resolver comprises

At least one touch-tone signal receiving chip is connected with described some dialing chips, and signal from described dialing chip is used to decode;

At least one bus buffer is connected with described touch-tone signal receiving chip, is used to transmit the signal of described touch-tone signal receiving chip decoding and mute signal that described dialing chip sends to described microprocessor.

2, telephone set according to claim 1 is characterized in that described keyboard is divided into number generator matrix and function keyboard matrix.

3, telephone set according to claim 2 is characterized in that being provided with in the described function keyboard matrix of described telephone set

One upturning key button is used for upwards query display information;

Turn over key button once, be used for downward query display information.

4, telephone set according to claim 2 is characterized in that being provided with in the described function keyboard matrix of described telephone set one and confirms key button.

5, telephone set according to claim 2 is characterized in that being provided with in the described function keyboard matrix of described telephone set a cancellation key button.

6, telephone set according to claim 2 is characterized in that being provided with a quickflashing key button in the described function keyboard matrix of described telephone set.

7, telephone set according to claim 1 is characterized in that described dialing chip is 9102D.

8, telephone set according to claim 1 is characterized in that described touch-tone signal receiving chip is 74HCT244.

9, telephone set according to claim 1 is characterized in that described processor controls is HM9270D.

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