JPS6184693A - Chime tone generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a chime sound generating device for use in intercoms, home telephones, other calling devices, and the like.

Conventional configurations and their problems In general, various types of chime sound generators have been developed and put into practical use. However, in most of them, if the circuit configuration is simple, the frequency of the chime sound is not very high, and Those with high frequency accuracy of the chime sound had a very complicated circuit configuration as a whole, and required a dedicated integrated circuit, which was not very desirable.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide an excellent chime sound generating device with a simple configuration and high frequency accuracy.

Structure of the Invention The present invention outputs a predetermined pulse signal to a first output terminal and a predetermined frequency signal to a second output terminal at a predetermined time by applying a predetermined signal to an input terminal. using a signal generating means such as a microcomputer to
A separately provided charge/discharge capacitor is driven by the output of this signal generating means, and a desired chime sound is obtained by the discharge voltage of the charge/discharge capacitor and a predetermined frequency signal appearing at the second output terminal. It is.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a schematic diagram of an embodiment of the chime sound generating device of the present invention. In the figure, 1 is a signal generating means composed of a microcomputer or the like, and 2 is a signal generating means whose frequency division ratio can be varied according to instructions. a timer counter that is configured as follows and outputs the frequency-divided predetermined frequency signal to the second output terminal 02;
3 is a pass line such as an address bus and a data bus that constitute the microcomputer, and 4 is a programmable counter.

5 is a program memory that stores programs.

6 is a decoder, 7 is an output port connected to the first output terminal 01, 8 is an input port connected to the Fi input terminal +1+12..., 9 is a memory for data storage, 1
0 is a clock generator, 11 is an amplifier, and 12 is a speaker. %S1 is the switch connected to the input terminal 11, and TR, TR2 are the switches connected to the input terminal 11, respectively. The second transistor +CI is a capacitor for charging and discharging.

C2 is a coupling capacitor and R2 is a resistor.

Note that the signal generating means 1 has an input terminal 'l+12, which will be described later.
When a predetermined signal is input to +13, the timing 'l+j is output to the first output terminal 0□ as shown in FIG. 2(b).
2, a predetermined pulse signal is outputted to the second output terminal at timing t as shown in FIG. 2(a).
From 1 to t2, frequency fl + timing t2 to 13
Up to this point, the configuration is such that a signal of frequency f2 is output, respectively.

The operation of the above embodiment will be explained in detail below. 1st
In the figure, the signal generating means 1 is constructed to operate in accordance with a program stored in a program memory 5 at all times. Now, when the switch S1 is closed, this is detected by the signal generating means 1, and the processing routine of the program memory 5 is entered in this state. When entering the processing routine of the program memory 5, first the timer counter 2
The frequency division ratio of the timer counter 2 is set so that a signal with a frequency ft corresponding to the first sound of the chime sound is outputted. At the same time, at the timing of the rise of the first sound, the output port door is operated to output a predetermined pulse signal.

Then, after a certain period of time has elapsed, the division ratio of the timer counter 2 is reset so as to output a signal of frequency f2 corresponding to the second tone, and at the same time, the same pulse signal as the previous one is output from the output port door. make it work like this.

Therefore, this relationship is illustrated in FIG. 2(a).

The result is as shown in (b). In FIGS. 1 and 2, timing 1. When a pulse signal is output to the first output terminal OI, the first transistor TR is turned on and off, and the charging/discharging capacitor C1 is immediately charged.

Then, when the pulse signal disappears, the first transistor TR1 is turned off, and from this moment on, the charge accumulated in the capacitor C1 is gradually discharged through the resistor R1. Therefore, the voltage across the capacitor C1 becomes as shown in FIG. 2(C). On the other hand, the second transistor TR2 has its pace connected to the interface C1 and its emitter connected to the second output terminal O2. A modulated signal like this is output. The same operation occurs at timing t2Tlc, and a modulation signal as shown in FIG. 2(d) is output from the collector of the second transistor TR2. Therefore, the speaker 12 is driven by these, and the speaker 12
A chime sound like "ping, boom" is output.

In this way, according to the above embodiment, the signal generating means 1 consisting of a microcomputer or the like is used, and its output charges and discharges a charging/discharging capacitor, and the voltage across the charging/discharging capacitor causes the signal generating means to It has the advantage that a chime sound with high frequency accuracy can be generated with an overall simple configuration.

According to the above embodiment, since a signal generating means such as a microcomputer is used, it can also be used for controlling the communication path of an intercom, a home telephone, etc. In this case, the signal generating means is separately generated. This has the advantage that there is no need to provide any means.

Effects of the Invention As is clear from the above embodiments, the present invention uses a signal generating means constituted by a microconbeater, etc., and controls a charging/discharging capacitor by the output of this signal generating means to obtain a modulation signal. Therefore, the timing and frequency of the first and second chime sounds can be set accurately by the signal generating means, and the desired chime sound can be obtained with high precision. .

According to the present invention, there is no need for many circuit elements other than the signal generating means, and the overall structure is extremely simple, which is advantageous in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the chime sound generating device of the present invention, and FIG. 2 is an explanatory diagram of the operation of the device. l...Signal generating means, TR,, TR,...1st.
Second transistor %CI...Charging/discharging capacitor.

Claims (1)

[Claims] When a predetermined signal is input to the input terminal, a predetermined pulse signal is output to the first output terminal at a predetermined time, and a signal of a predetermined frequency is output to the second output terminal. a signal generating means composed of a microcomputer or the like that outputs a signal, and a first transistor for receiving the pulse signal appearing at a first output terminal of the signal generating means and charging a separately provided charging/discharging capacitor. . A chime sound generating device, comprising: a second transistor connected to a second output terminal of the signal generating means, the second transistor modulating the discharge voltage of the charging/discharging capacitor with the signal appearing at the second output terminal.