JPH03162044A - Automatic tone volume circuit for call tone of telephone set - Google Patents

Abstract

PURPOSE:To prevent overhearing of the user of a telephone set by increasing applied current of a speaker gradually and increasing the tone volume of a call tone sequentially. CONSTITUTION:A timer 1 counts a clock CK by a prescribed time after an incoming signal is received from a telephone line by a telephone set and a switch 2 selects resistors R1, R2 for each counted time and the drive current of the speaker S is sequentially increased to increase the tone volume of the call tone sequentially. Thus, even when the call tone of the telephone set is not heard by the user of the telephone set at first, the tone volume of the call tone is sequentially increased. Thus, the tone is listened to by the user of the telephone set without fail.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a volume control circuit for the ringing tone when a telephone receives an incoming call, especially when the ambient noise of the telephone is high. The purpose is to provide an automatic volume control circuit, which includes a timer that sends out a control signal C every time a clock Cκ is counted for a certain period of time after the telephone receives an incoming signal from the telephone line, and a speaker using the control signal C sent by the timer. Resistance Rl of drive current of S
．． A switch for switching R2 is provided, and the switch is operated to sequentially increase the current applied to the speaker S so that the volume of the ringing tone increases sequentially.

[Industrial application field]

The present invention relates to a ring tone when a telephone receives an incoming call, and more particularly to a ring tone volume control circuit when ambient noise around the telephone is high.

If the ambient noise around the telephone is high, the ringing tone may not be audible in some cases, but the ringing tone must always be transmitted to the telephone user.

[Conventional technology]

As shown in Figure 3, the conventional telephone ringer volume control circuit intermittents (sends for 1 second, pauses for 2 seconds) a nominal 16Hz alternating current signal from the exchange when the telephone receives a call from the telephone line.
It will be sent to you. The telephone detects the incoming AC signal and causes the speaker S to ring as a ring tone for the user. The ringer volume of the telephone can be adjusted by the telephone user using the selector switch SW to adjust the volume of the ringer on the resistor RA. Contact a. connected to Rs. b. The current applied to the speaker S was controlled by changing the current applied to the speaker S from large to medium and small by switching the current.

[Problem to be solved by the invention]

As mentioned above, the ringer volume of conventional telephones is controlled by the telephone user by setting the changeover switch SW to three levels: large, medium, and small, but public telephones, so-called pink telephones, do not have this switching function. None. Additionally, if the user of a private phone sets the selector switch SW to medium-low instead of high, there is a problem in that the ringtone is overpowered by loud ambient noise, and there are many cases of people missing the ringtone. . SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic volume control circuit for the ringing tone of a telephone, which the user of the telephone does not miss.

[Means to solve the problem]

This problem is solved by providing a timer 1 that sends out a control signal C every time a clock CK is counted for a certain period of time after receiving an incoming signal from a telephone or a telephone line, as shown in FIG. The resistance R of the driving current of the speaker S is determined by C. This problem is solved by the present invention, in which the switch 2 that switches between R and R is operated to sequentially increase the current applied to the speaker S, thereby sequentially increasing the volume of the ringing tone.

In the principle diagram of FIG. 1 showing the basic configuration of the automatic ringer volume circuit of the mobile phone according to the present invention, l is a control signal that is controlled every time the telephone counts the clock CK for a certain period of time after the telephone receives an incoming call signal from the telephone line. This is a timer that sends out signal C.

Reference numeral 2 denotes a switch that switches the resistances R, , R2 of the drive current of the speaker S in accordance with the control signal C sent out by the timer 1.

Then switch 2 is automatically activated by the incoming current,
The current applied to the speaker S is sequentially increased to sequentially increase the volume of the ringing tone.

[Effect]

The timer 1 counts the clock CK for a certain period of time after the telephone receives an incoming signal from the telephone line, causes the switch 2 to switch the resistors Rl and R2 at each counted time, and sequentially changes the driving current of the speaker S. Increase the ringer volume sequentially. Therefore, even if the user of the telephone cannot hear the ringing tone of the telephone at first, the volume of the ringing tone gradually increases, so that the user of the telephone always hears it, and the problem is solved.

〔Example〕

FIG. 2 is a circuit diagram showing the configuration of an automatic ringer volume circuit for a telephone according to an embodiment of the present invention.

In FIG. 2, the timer 1 is composed of a counter 11 and a decoder l2, and the switch 2 is connected to resistors R, , R. Contact point AI. A2; Bl. B2; Cl.
It consists of an analog switch with C2. The counter 11 of the timer 1 counts the clock CK for a certain period of time, for example, several seconds after the telephone receives an incoming signal from the telephone line, and the decoder 12 decodes the count value, and at each counted time, Contact A2 of switch 2 from output terminal 0, 1.2. B2. A switching signal is sent to C2, and contacts A, . B,,C. Therefore, the resistance R,, R
2, and the driving current of the speaker S is sequentially increased to sequentially increase the volume of the ringing tone. Therefore, even if the telephone ringtone is at a low volume that cannot be heard by the telephone user, the volume of the ringtone will gradually increase so that the telephone user will always be able to hear it and there will be no problem. .

Note that the counter 11 of the timer 1 and the decoder 12 are reset when the incoming signal from the telephone line stops.

〔Effect of the invention〕

As explained above, according to the present invention, when the telephone user misses the ringing tone of the telephone, the volume is automatically increased by the incoming current to ensure that the telephone user hears the ringing tone. It is possible to obtain the effect of conveying information and to make the use of the telephone more convenient.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram showing the basic configuration of an automatic ringer volume circuit for a telephone according to the present invention; FIG. 2 is a circuit diagram showing the configuration of an automatic ringer volume circuit for a telephone according to an embodiment of the present invention; The figure is a circuit diagram for controlling the ring tone volume of a conventional telephone. In the figure, I is a timer and 2 is a switch. U-I-6 Traditional telephone Iso's sound from a long time ago! Control hesitation diagram! 8 3 Figure

Claims (1)

[Claims] A timer (1) that sends out a control signal C every time a clock CK is counted for a certain period of time after the telephone receives an incoming signal from a telephone line, and a control signal C sent by the timer.
The resistance of the driving current of the speaker S (R_1, R_2
), and when the switch is operated, the current applied to the speaker S is sequentially increased to sequentially increase the volume of the ring tone. circuit.