JP3660971B2 - Telephone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telephone having a hook switch such as a cordless telephone.
[0002]
[Prior art]
For example, in a cordless telephone, an operation is sometimes performed in which the handset is removed from the hook switch and the hook switch in the off-hook state is pressed with a finger or the like to once turn on hook. For example, when dialing to input the other party's phone number, when dialing, as is well known, the other party's phone number is entered with the handset removed from the hook switch and the hook switch set to off-hook. In some cases, the user may make a mistake in entering the number. In this case, the user presses the hook switch with a finger or the like to place the hook switch on-hook once, disconnects the line once, and then inputs the telephone number again.
[0003]
In addition, when the call partner is switched from the second party to the third party using call waiting, an operation of pressing the hook switch with a finger or the like to once turn the hook switch on is performed. That is, when a catch signal is received from a third party during a call using the call waiting system, the other party is switched from the second party to the third party by pressing the hook switch with a finger or the like to turn the hook switch once on hook. .
[0004]
[Problems to be solved by the invention]
By the way, once the hook switch in the off-hook state is turned on hook as described above, the on-hook signal is transmitted to the exchange side and the line is disconnected or the other party is changed as described above. To recognize the signal, 100 to 300 ms when hooking is not allowed (corresponds to dialing before the other party's response), 300 when hooking is allowed (corresponding when switching with call waiting after the other party's response) A recognition time of ~ 1000 ms is required. Therefore, the telephone must generate an on-hook signal with a length of 300 ms or more when erroneously dialing, and an on-hook signal with a length of 300 to 1000 ms or more when switching a call partner with a call waiting. In such an operation, the pressing time is short and the length of the on-hook signal does not reach the predetermined time. As a result, the on-hook signal cannot be recognized by the exchange side, resulting in a malfunction.
[0005]
FIG. 5 is a diagram for explaining an example of a malfunction when dialing. In this figure, as shown in FIG. 5 (a), when the number 4 and the number 2 are dialed, a mistake is noticed, and the hook switch is temporarily turned on hook (OF). after, although the dials 3, and the number 2 again numbers, for on-hook time of the hook switch (oF) is short, misidentified as part of a dial pulse on-hook signal S _oF as shown in (b) ing. As a result, when the dial is performed as the number 4, the number 2, the number 4, the number 2, as in the case 1 of (c), or the number 4, the number as in the case 2 It was mistaken that it was done like number 3, 2, 2, or case 4, like number 3, number 2, number 1, number 3, number 2, and so on. Become.
[0006]
The present invention has been made in view of the above points, and it is an object of the present invention to provide a telephone that can accurately recognize an on-hook signal on the exchange side even when the on-hook time of the hook switch is short, and can operate accurately.
[0007]
[Means for Solving the Problems]
The telephone of the present invention determines the on-hook time of the hook switch when the hook switch in the off-hook state sequentially changes from on-hook to off-hook, and corresponds to the hook switch returning to off-hook when this on-hook time is longer than a predetermined time. The line side is set to the off-hook state, but when the on-hook time is within the predetermined time, the line side is kept on-hook until the predetermined time, and the line side is set to the off-hook state after the predetermined time , Further, it is determined whether the hook switch is on-hook before the partner response or after the partner response, and the predetermined time is changed before and after the partner response .
[0008]
The telephone odor Te, before Symbol predetermined time, the time that the exchange side can recognize the on-hook state.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a telephone according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 4 is a block diagram showing a base unit of a cordless telephone as an embodiment of the telephone of the present invention. The base unit 10 has a CPU 11 that controls the entire base unit, and a dialer IC 25, an LCD display unit 13, and a hook switch 16 are connected to the CPU 11. The dialer IC 25 has a DP / DTMF transmission function and is connected to the key matrix 12. Here, the key matrix 12 has an answering key, a reproduction key, a hands-free key, a registration key, a numeric keypad, etc., and inputs various information. The LCD display unit 13 displays various information such as the telephone number of the received caller. The hook switch 16 determines whether or not the handset is installed on the base unit 10.
[0010]
Reference numeral 17 denotes a line terminal to which an incoming call detection circuit 18 for detecting a ringer signal is connected, and an output of the incoming call detection circuit 18 is connected to the CPU 11. 19 is a rectifier circuit that prevents the voltage polarity reversal of the line terminal 17 from affecting the inside of the telephone, 20 is a DP sending circuit that connects and disconnects the line, and 21 is a speech network IC that performs 2-wire-to-wire conversion. Yes, the line terminal 17 is connected to the CPU 11 via these circuits. Further, a handset 22, a microphone 23, a speaker 24, and a DSPIC 15 are connected to the speech network IC 21. The DSPIC 15 has recording / playback, hands-free, TONE / VOX detection, caller ID reception functions, and the CPU 11 and information. Is also connected to the ROM 14. The ROM 14 stores various kinds of information such as the telephone number of the received caller, and also stores voice data such as a memory function as a telephone directory, a response message in the absence recording mode, and a message from the received caller. Furthermore, the speech network IC 21 and the CPU 11 are connected to the RF module 27 via the compander IC 26 in order to perform wireless communication with the slave unit, and the antenna 28 is connected to the RF module 27. Furthermore, the base unit 10 has a power supply circuit 29, and a power supply voltage is supplied from the power supply circuit 29 to each of the above parts.
[0011]
In the base unit 10 of the cordless telephone as described above, when the hook switch 16 in the off-hook state is sequentially changed from on-hook to off-hook, the on-hook time of the hook switch 16 is determined. Corresponding to the switch 16 returning to the off-hook state, the line side (line terminal 17) is set to the off-hook state. When the on-hook time is within the predetermined time, the line side is kept on-hook until the predetermined time. Then, the line side is set to the off-hook state after the predetermined time. Further, it is determined whether the hook switch 16 is on-hook before the partner response or after the partner response, and the predetermined time is changed before and after the partner response. Specifically, the predetermined time is set to 300 ms before the partner response, and the predetermined time is set to 600 ms (can be changed to 300 to 1000 ms, etc.) after the partner response. If the predetermined time is such time, the on-hook can be accurately recognized on the exchange side.
[0012]
The above operation will be described in more detail with reference to the flowchart of FIG. When the hook switch 16 in the off-hook state enters the on-hook state (step S1), the line side is simultaneously set to the on-hook state, and the on-hook time of the hook switch 16 is counted from 0 (step S2). When the hook switch 16 returns to the off-hook state (step S3), it is determined whether the hook switch 16 is on-hook before the opponent response or after the opponent response (step S4), and is determined to be before the opponent response. In step S5, it is determined how long the on-hook state of the hook switch 16 has been continued. If the duration is 300 ms or more, the flow proceeds to step S7, and the line side is turned on simultaneously with the return of the hook switch 16 to the off-hook state. Set to off-hook state. On the other hand, if it is determined in step S5 that the continuation of the on-hook state of the hook switch 16 is 300 ms or less, the process proceeds to step S6 and the line side is maintained on-hook until the on-hook time reaches 300 ms, and the on-hook time reaches 300 ms. Proceeding to step S7, the line side is set to the off-hook state.
[0013]
On the other hand, if it is determined in step S4 that the hook switch 16 is on-hook before the other party's response, the process proceeds to step S8, where it is determined how long the hook switch 16 has been on-hook, and the duration is 600 ms or longer. If so, the process proceeds to step S7, and the line side is set to the off-hook state simultaneously with the return of the hook switch 16 to the off-hook state. On the other hand, if it is determined in step S8 that the on-hook state of the hook switch 16 is 600 ms or less, the process proceeds to step S9 and the line side is maintained on-hook until the on-hook time reaches 600 ms, and the on-hook time reaches 600 ms. Proceeding to step S7, the line side is set to the off-hook state.
[0014]
Therefore, according to the above base unit 10 of the cordless telephone, a dial error occurs during dialing before answering the other party, and once the hook switch 16 is turned on, even if the on-hook time is short, it is always 300 ms on the line side. Since the on-hook state is maintained and the on-hook signal having a length of 300 ms is transmitted to the exchange, the on-hook (line disconnection) of the hook switch 16 can be accurately recognized by the exchange, and the dial operation becomes accurate.
[0015]
FIG. 2 is a diagram showing an example in which the dialing operation is accurate according to the present invention. In this figure, as shown in (a), when the numbers 4 and 2 are dialed, a mistake is noticed, and once the hook switch is turned on hook (OF), the numbers 3 and 2 are dialed again. . At this time, even if the on-hook time (OF) of the hook switch is short, in the present invention, as shown in (b), the line side is kept on-hook for 300 ms, and the on-hook signal S _OF having a length of 300 ms is exchanged. Therefore, as shown in (c), the exchange accurately determines that the on-hook is a line disconnection, and accurately determines the subsequent number 3 and number 2 dialing as a new number input.
[0016]
Similarly, according to the base unit 10 of the cordless telephone set described above, even when the on-hook time of the hook switch 16 is short when the call partner is switched by the call waiting after answering the other party, the on-hook state is always maintained for 600 ms on the line side. Since the on-hook signal having a length of 600 ms is transmitted to the exchange, the exchange can accurately recognize the call partner switching, and the call partner can be accurately switched. Furthermore, according to the above-described base unit 10, an accurate operation can be realized even when the hook switch 16 is turned on by a trio phone or a voice warp, similarly to when the hook switch 16 is turned on by a catch phone.
[0017]
When the hook switch 16 and the line side simultaneously change from the off-hook state to the on-hook state in the cordless telephone base unit 10 described above, a delay of 30 ms is actually caused on the line side as shown in the waveform diagram of FIG. Is given. This prevents chattering of the hook switch 16 from affecting the line side. Therefore, more precisely, the on-hook time of the hook switch 16 is counted from the time point when the delay is 30 ms. Further, the line side is controlled so that the on-hook state becomes equal to or longer than the predetermined time from the point of delay of 30 ms. Note that FIG. 3 shows a delay when changing from the off-hook state to the on-hook state, but the on-hook time of the hook switch 16 is longer than a predetermined time, and the line side is set to the off-hook state simultaneously with the return of the hook switch 16 to the off-hook state. Sometimes, actually, a delay of 30 ms is given to the line side, and the influence of chattering of the hook switch 16 is eliminated.
[0018]
The above is a case where the present invention is applied to a base unit of a cordless telephone, but the present invention can be applied to all telephones having a hook switch.
[0019]
【The invention's effect】
As described above in detail, according to the telephone of the present invention, even if the on-hook time of the hook switch is short, the on-hook signal can be recognized accurately on the exchange side, and an accurate operation can be realized.
[Brief description of the drawings]
FIG. 1 is a flowchart showing the operation of an embodiment of the present invention.
FIG. 2 is a diagram showing an example in which a dial operation is accurate according to the present invention.
FIG. 3 is a waveform diagram for explaining prevention of chattering of the hook switch in the embodiment of the present invention.
FIG. 4 is a block diagram showing an embodiment of a telephone of the present invention.
FIG. 5 is a diagram for explaining a malfunction of the prior art taking a case of dialing as an example;
[Explanation of symbols]
16 Hook switch 17 Line terminal 22 Handset

Claims (2)

When the hook switch in the off-hook state sequentially changes from on-hook to off-hook, the on-hook time of the hook switch is determined. However, when the on-hook time is within the predetermined time, the line side is kept in the on-hook state until the predetermined time, the line side is set to the off-hook state after the predetermined time , and the hook switch is set to the on-hook state. A telephone set characterized by determining whether the response is before or after the other party response, and changing the predetermined time before and after the other party response . The telephone set according to claim 1, wherein the predetermined time is a time during which an exchange side can recognize an on-hook state.

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