JPH0411438A - Dial switching device for telephone set - Google Patents

Abstract

PURPOSE:To select automatically a selection signal sent from a telephone set by sending a tone dial signal corresponding to a numerals after 1st and 2nd digit figures stored by a pulse dial transmission means to a line sequentially. CONSTITUTION:When a caller hooks off a handset and dials a 1st digit number, a CPU 1 sends a relevant tone dial signal to a line and starts a TIM 3. When a time stored in a MEM 2 and a time counted by the TIM 3 are coincident, the CPU 1 detects whether or not a tone signal exists on the line by a TDET 4. When the CPU 1 does not detect the tone signal on the line, the CPU 1 discriminates a selection signal used in the line to be a tone pulse signal and sends a tone dial signal corresponding to the numbers after 2nd and succeeding digits to the line sequentially. When the CPU 1 detects the tone signal, the CPU 1 discriminates the selection signal to be a pulse dial signal, the CPU 1 reads the 1st digit number from the MEM 2 and sends the pulse dial signal corresponding to the succeeding numerals dialed succeedingly.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a telephone dial switching device for switching between a tone dial signal and a pulse dial signal of a telephone.

(b) Conventional technology Normally, as a selection signal sent to the line when making a telephone call,
Two types of signals are used: tone dial signals and pulse dial signals.

A switch is used to switch between these two types of signals.

For example, in Japanese Unexamined Patent Application Publication No. 63-127641 filed by the applicant of the present application, a progera mode/set mode changeover switch and a pulse/tone changeover switch are provided, and by appropriately operating these two switches, a tone dial signal and a pulse dial The signal is being switched.

(c) Problems to be Solved by the Invention When a switch is used to switch between a tone dial signal and a pulse dial signal as described above, the switch cannot be switched appropriately unless the operator operating the switch knows the selection signals that can be used on the line. There is an opening.

Furthermore, there is a possibility that the switch may be switched inadvertently due to the operator's carelessness.

(d) Means for Solving the Problems The present invention provides a tone dial signal sending means for sending a tone dial signal to a line, a pulse dial signal sending means for sending a pulse dial signal to a line, and a memory for storing a first number. a tone signal detection means for detecting whether or not a tone signal is present on the line; a timekeeping means for counting the time since the tone dialing signal corresponding to the first digit is sent; and the timekeeping means. If the tone signal detection means does not detect the tone signal when the means measures a certain period of time, the tone dial signal sending means sequentially sends tone dial signals corresponding to the numbers after the second number to the next line. At the same time, if the tone signal detecting means detects the tone signal when the clocking means measures a certain period of time, the pulse dial transmitting means stores the first number and the second number stored in the storage means. 1. A dial switching device for a telephone set, comprising: control means for sequentially sending out tone dial signals corresponding to digits to the next line.

(E) Effect According to the present invention, if the tone signal detection means does not detect a tone signal when the timer measures a certain period of time, the tone dial signal sending means responds to the digits after the second number. If the tone signal detection means detects a tone signal when the tone dial signal is sequentially transmitted to the next line and the timer measures a certain period of time, the first digit and the second number stored in the storage means by the pulse dial transmission means are Since it is equipped with a control means that controls the tone dial signals corresponding to the numbers after the digits to be sequentially sent to the next line, it is possible to automatically switch the selection signal sent from the telephone according to the selection signal that can be used on the line. can.

That is, the present invention was made by focusing on the fact that when the first digit is received on the line, the tone signal of the line stops, and a tone dial signal is sent, and this tone dial signal is transmitted to the line. By determining whether or not the second digit has been received, the second digit and subsequent digits are sent to the line, or the selection signal is switched and the first digit and second digit are sent out. The operator can use the telephone without being aware of the selection signals available on the line.

(F) Embodiment FIG. 1 is a block diagram of a telephone dial switching device according to an embodiment of the present invention.

In the figure, 1 is the central control unit (CPU), 2 is the memory (MEM), and 3 is the timer (TIM) that measures time.
, 4 is a tone signal detection circuit (TDET), and 5 is a network control unit (NCU).

CPji1 is in charge of overall control.

MEM2 is the time from when the selection signal is sent to the line until the tone signal of the line is checked and the first digit input from the telephone (the first digit of the telephone number of the person you wish to call) is be remembered. This time needs to be set to be somewhat longer than the time from when the line receives the selection signal to when the tone signal is stopped.

TIM3 measures time.

TDET4 detects whether a tone signal is present on the line via NCU3.

Next, the operation of the above-mentioned telephone dial switching device will be explained.

First, when the operator (caller) takes the telephone off-hook and dials a first digit, the CPUI sends a tone dial signal corresponding to the first digit to the line and starts TIM3.

When the time stored in ~i EM 2 and the time measured by this TI M 3 match, the CPU 1
TDET4 detects whether a tone signal exists on the line.

If the CPU does not detect a tone signal on the line, it determines that the selection signal available on the line is a tone pulse signal, and selects the second digit to be dialed (the second digit of the telephone number of the desired party). digits) The tone dial signals corresponding to the subsequent digits are sent sequentially to the line.

On the other hand, if the CPU detects a tone signal on the line, it determines that the selection signal that can be used on the line is a pulse dial signal, reads the first digit from MEM2, and selects the first digit that was not received on the line. Pulse dialing signals corresponding to the digits and the digits after the second digit that are subsequently dialed are sequentially transmitted to the line.

In addition, even if the selection signal is switched from a tone dial signal to a pulse dial signal and sent from the first number, the time is several 100 m5ec compared to the case where the selection signal is not switched.
This is only a delay, so it is not a problem for the caller.

As is clear from the above description, the present invention allows appropriate switching to be performed even if the operator does not know the selection signals that can be used on the line. That will no longer be the case.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a telephone dial switching device according to an embodiment of the present invention. 1...Central control unit (CPU), 2...-Memory (M
EM), 3...Timer (TIM), 4...Tone signal detection circuit (TDET), 5...Network control unit (NCU)
).

Claims (1)

[Claims] (1) A tone dial signal sending means for sending a tone dial signal to the line, a pulse dial signal sending means for sending a pulse dial signal to the line, a storage means for storing the first number, and a tone signal on the line. tone signal detection means for detecting whether or not the tone dial signal corresponding to the first digit has been sent; a clock means for measuring the time elapsed after transmitting the tone dial signal corresponding to the first digit; If the signal detection means does not detect the tone signal, the tone dial signal sending means sequentially sends tone dial signals corresponding to the digits after the second number to the next line, and the clocking means clocks a certain period of time. When the tone signal detection means detects the tone signal, the pulse dial sending means sequentially sends tone dial signals corresponding to the first digit and the digits subsequent to the second digit stored in the storage means. 1. A dial switching device for a telephone, comprising: control means for controlling transmission to a telephone.