JPS63200653A - Telephone set - Google Patents

Abstract

PURPOSE:To surely recognize a calling sound even at a location apart from the telephone set while suppressing unrequired noise by counting the number of times of intermittently calling signal and controlling the degree of the amplification of an amplifier circuit amplifying the call sound based on the counted value. CONSTITUTION:The counting circuit 25 counts the interruption of the call signal rectified by a diode block 2 through the reception via a hook switch 3 and when the count exceeds a predetermined value, e.g., '3', the circuit 25 outputs a control signal to increase the degree of the amplification of the amplifier circuit 24. The degree of the amplification of the amplifier circuit 24 is set to a low value at first by which the sound of the calling tone generated from a sounder 7 can be listened to only a person residing in the vicinity of the telephone set and the amplification is increased to a value sufficiently high by which the calling sound is listened to even a person residing at a location apart from the telephone set by using the control signal outputted from the counting circuit 25 when the count exceeds the prescribed value, e.g., '3'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to volume control of the ringing tone of a telephone using a tone-recall method.

[Prior art] In recent years, electromagnetic bells1 have been used as ringtones for telephones.
Instead, a tone ringer system using an electronic circuit and a speaker or a dedicated sounder is being used.

Figure 2 shows, for example, "Telecommunications technology that anyone can understand (top)"
(Published by Telecommunications Association on September 15, 1986) No. 31
FIG. 5 is a block diagram illustrating a conventional telephone of such type, as shown on pages 51-51. In the figure, l is a terminal connected to the exchange via the subscriber line, and 2 is this terminal 1.
3 is a hook switch connected to this diode block 2,
4 is a tone ringer circuit connected to the normally open side of this hook switch 3; 5 is a tone selection switch of this tone ringer circuit 4; 6 is a volume selection switch of this tone ringer circuit 4; 7 is connected to the tone ringer circuit 4. 8 is a power return circuit connected to the normally closed side of the hook switch 3; 9 is a push button dial switch; IO is a PB signal oscillation circuit connected to the push button dial switch 9; 11 is a PR signal oscillation circuit IO The dial memory connected to, 12 is the transmission switch of this dial memory,! 3 is a speech circuit, 14 is a transmitter thereof, 15 is a receiver, IO is a balanced circuit network connected to the speech circuit I3, I7 is an amplifier for loudspeaking connected to the speech circuit 13, and I8 is a telephone receiver. A speaker 19 is connected to the amplifier 17, and 19 is the speaker 18 connected to the amplifier 17.
20 is an audio switch for controlling the communication circuit 13 and amplifier 17 to prevent howling.

Further, FIG. 3 is a block diagram showing a conventional tone ringer circuit used here. In the figure, 21 is an oscillator that oscillates a high frequency signal, 22 is a master clock circuit 1 that creates a fundamental frequency signal from the high frequency signal from this oscillator 21, and 23 is a tone ringer signal that generates a tone ringer signal from each fundamental frequency signal from this master clock circuit 22. The tone ringer signal generation circuit 24 is an amplifier circuit that amplifies the tone ringer signal from the tone ringer signal generation circuit 23.

Next, the operation will be explained. When making a call, the hook switch 3 is switched when hooked up, and power from the exchange is supplied to each circuit via the diode block 2 and the power switching circuit 8. Here, push button dial switch 9
When operated, the PB signal oscillator 10 is activated and sends a selection signal based on the PB multiple signal to the exchange. When the connection with the other party is completed, it becomes possible to make a call using the transmitter 14, receiver 15, or speaker 18 via the call circuit I3.

Further, during reception, a 16'Hz ringing signal received from the exchange is rectified by the diode block 2 and sent to the tone ringer circuit 4 via the hook switch 3, and the tone ringer circuit 4 is activated thereby. That is, in this tone ringer circuit 4, the oscillator 2I oscillates a high frequency signal of, for example, 32 KHz, and this high frequency signal is frequency-divided by the mask clock circuit 22, for example, 819 Hz, 102 KHz.
The signal is converted into fundamental frequency signals such as 4Hz, 1365Hz, 16Hz, and 8Hz, and is supplied to the tone ringer signal generation circuit 23. Here, when a calling signal from the aforementioned exchange arrives at terminal 1, it is rectified by diode block 2, and is applied to tone ringer signal generating circuit 23 via hook switch 3. Upon receiving this, the tone ringer signal generation circuit 23 operates, appropriately synthesizes each fundamental frequency signal from the master clock circuit 22 to generate a tone ringer signal, and passes it to the amplifier circuit 24. The combination of fundamental frequency signals in this tone ringer signal generation circuit 23 is selected by the tone changeover switch 5. The amplification circuit 24 amplifies this tone ringer signal and supplies it to the sounder 7, which makes it sound and generates a ringing tone. here,
Since this tone ringer signal generation circuit 23 operates only with the active part of the rectified ringing signal, the ringing tone from the sounder 7 will ring for one second in synchronization with the intermittent ringing signal, similar to an electromagnetic bell. Do not repeat the 2 second pause. Further, the volume of this ringing tone can be changed by the amplification circuit 24 by the volume changeover switch 6.
It is adjusted by appropriately selecting the degree of amplification.

[Problems to be Solved by the Invention] Since the conventional telephone is configured as described above, unnecessary noise can be reduced by switching the amplification degree of the amplifier circuit 24 with the volume selector switch 6 and lowering the volume of the ringer. Although this can prevent the occurrence of calls, there is a problem that if the user is far away from the telephone, he or she will not notice the ringing tone from the sounder 7 and may not be able to respond to the incoming call.

This invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a telephone that can reliably recognize the ringing tone even when the user is away from the telephone while suppressing unnecessary noise.

[Means for Solving the Problems] The telephone according to the present invention counts the number of intermittent ringing signals, and controls the degree of amplification of the amplifying circuit that amplifies the ringing tone based on the counted value. be.

"Function" The telephone according to the present invention lowers the amplification degree of the amplification circuit that amplifies the ring tone at first, and makes a call with a low volume ring tone, thereby preventing the generation of unnecessary noise and intermittent ring tone. By counting the number of times and controlling the degree of amplification of the amplifier circuit based on the counted value, the volume of the ring tone is increased when the response is slow.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is a terminal, 2 is a diode block, 3 is a hook switch, 5 is a tone selection switch, 7 is a sounder, 21 is an oscillator, 22 is a master clock circuit, 23 is a tone ringer signal generation circuit, and 24 is an amplifier circuit. , these are the same as, or equivalent to, those of the conventional one with the same reference numerals in FIG. 3, so detailed explanations will be omitted. Also,
A counting circuit 25 receives an input signal from the hook switch 3 and outputs a control signal to the amplifier circuit 24.

Next, the operation will be explained. The high frequency signal outputted from the oscillator 21 is frequency-divided by a master clock circuit 22, converted into various fundamental frequency signals, and provided to a tone ringer signal generation circuit 23. When a ringing signal arrives at the terminal I from the exchange due to an incoming call, this ringing signal is rectified by the diode block 2 and sent to the tone ringer signal generating circuit 23 via the hook switch 3. This activates the tone ringer signal generation circuit 23, which appropriately synthesizes each fundamental frequency signal from the master clock circuit 22 to generate a tone ringer signal. This tone ringer signal is transmitted to the amplifier circuit 2.
4, the sounder 7 is amplified to generate a ringing tone. At this time, the combination of fundamental frequency signals in the tone ringer signal generation circuit 23 is
selected by The operation up to this point is similar to the conventional one shown in FIG.

The counting circuit 25 receives the calling signal rectified by the diode block 2 via the hook switch 3 and counts the interruption thereof, and when the counted value exceeds a predetermined value, for example "3". , outputs a control signal to the amplifier circuit 24 to increase its amplification degree. Here, the amplification degree of the amplifier circuit 24 is initially set to a low value such that the volume of the ringing tone generated from the sounder 7 can be heard only by those in the vicinity of the telephone, and the count value is set to a predetermined value "3". When the ringing tone exceeds "2," the counter circuit 25 outputs a control signal to raise the ringing tone to a high enough value that even a person who is far away from the telephone can hear the ringing tone sufficiently. Note that the amplification degree of the amplifier circuit 24 can be easily controlled by adjusting the bias current with a control signal from the counting circuit 25, or by shorting/opening a part of the input resistance with a transistor switch. Can be done.

In the above embodiment, when the count value of the counting circuit 25 exceeds a predetermined value, the amplification degree of the amplifier circuit 24 is suddenly increased to a predetermined value. “2”, “4”.

A control signal corresponding to "6-..." may be outputted, and the amplification degree of the amplifier circuit 24 may be sequentially increased in accordance with this control signal.

In addition, in the above embodiment, the tone ringer signal is generated by appropriately synthesizing various basic frequency signals from the master clock circuit in the tone ringer signal generation circuit, but the tone ringer signal is generated by directly driving the LC oscillation circuit with a call signal from the exchange. A single tone ringer signal generation circuit may be used to generate the ring tone, and furthermore, a speaker may be used instead of a dedicated sounder to generate the ring tone. be effective.

[Effects of the Invention] As described above, according to the present invention, the amplification degree of the amplifier circuit is initially set low, the volume of the ringing tone is made low, and the amplification degree of the amplifier circuit is increased depending on the number of intermittent ringing signals. The system is configured to increase the volume of the ringer by increasing the volume of the ringer, so when you are near the phone, you can answer while the volume of the ringer is low to reduce unnecessary noise, and when you are far away from the phone, the volume of the ringer will be louder. Since the volume of the sound increases over time, there is no risk of not noticing the ringing tone.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a tone ringer circuit of a telephone according to an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional telephone, and FIG. 3 is a block diagram showing the tone ringer circuit thereof. 7 is a sounder, 23 is a tone ringer signal generation circuit, 24
is an amplifier circuit, and 25 is a counting circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 7: 7 Ushida 23: Tone Lingwi official title 1, collection 9 each -24;

Claims (3)

[Claims] (1) A tone ringer signal generation circuit that operates in response to a call signal from an exchange to generate a tone ringer signal, and an amplifier circuit that amplifies the tone ringer signal from the tone ringer signal generation circuit and drives a speaker or a dedicated sounder. 1. A telephone set, comprising: a counting circuit for counting the number of intermittent calling signals from the exchange; and controlling the degree of amplification of the amplifier circuit based on the count of the counting circuit. (2) The control of the amplification degree is such that when the count value of the counting circuit exceeds a certain value, the amplification degree is increased to a predetermined value. telephone. (3) The control of the amplification degree is such that the amplification degree is sequentially increased by a predetermined value each time the count value of the counting circuit increases by a predetermined value. telephone.