JPS6019519B2 - electronic sound device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic device that generates a bell imitation sound, and more particularly to an electronic sounding device that is equipped with an electronic sounding means that generates a bell imitation sound by synthesizing a plurality of frequency components. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic sounding device having a simple circuit configuration that can generate tones similar to conventional mechanical and electromagnetic bells using a simple electronic circuit and a speaker. Another object of the present invention is to provide a highly effective electronic sounding device that can be easily added to various types of alarms such as alarm bells, emergency bells, and other applications suitable for alarms and notifications using bell sounds. It is in.

Mechanical bells and electromagnetic bells have been widely used as alarm bells for self-awareness, emergency bells, and various other types of alarm bells.

However, in recent years, a wave of computerization has swept over many devices. The self-aware table clock is no exception. The bell-sounding part of the clock used to be driven by a secondary spring, but in recent years, due to demands for higher precision and ease of use, there has been a shift towards crystal electronic clocks and AC clocks that use batteries as their energy source. It started to change. These electronic watches are comprised of an oscillation section including a crystal oscillator, a time signal production circuit section, a time display drive section, a time display section, and the like. For analog display watches, excluding the time display drive unit and time display unit, and for digital watches,
Except for the time display section, it is usually housed in a single chip integrated circuit. On the other hand, the bell part is made to sound by hitting the metal part with a metal rod. With such a mechanical sounding method, it is difficult to reduce the size of the watch, and it cannot be said that it is good for the image of an electronic watch. Since the main body of the clock section is integrated, it is naturally preferable that the bell sounding section is also electronic. However, the sound of a bell when it hits a metal part has a very complex sound waveform, and it has been difficult to produce a similar sound using electronic circuits and speakers. Therefore, electronic buzzers that generate sounds with simple waveforms have attracted attention and are currently serving as an alternative to bells. However, the sound of a bell striking a metal part is a warning sound and notification sound that is ``the most appropriate sound'', helped by the habit that we have become accustomed to. For example, the alarm sound of a clock or an emergency bell. FIG. 1 shows an example of a simple configuration that has been conventionally used.

In FIG. 1, 101 is an oscillation circuit composed of a crystal oscillation circuit, a CR oscillation circuit, and the like. 102 is a frequency dividing circuit for receiving the output of the oscillation circuit and obtaining desired frequencies f, f2, . . . fn during synthesis.

103-105 are triggered by a certain frequency fm in the frequency divider circuit, f. , f2 . . . m.

Reference numerals 106 to 108 denote envelope adding circuits that add envelopes to f, f2 . . . fn to generate f', f'2 . . . rn.

109 receives f',, f'2...f'n and gives an arbitrary component ratio (f, /a, f2/b...
...fn/n) is a mixing circuit for synthesizing.

110 is a drive circuit for driving the speaker 111 in response to the output f blood x of the mixing circuit 109.

Figure 1 shows a circuit configuration shown as a conventional example, in which waveforms of multiple frequencies are used to synthesize complex waveforms such as a metallic bell sound in order to obtain a highly similar sound pattern. thing. It is possible to create a sound pattern with a simple electronic circuit by obtaining multiple frequencies by frequency division from a single original oscillation.

In order to make the sound of a bell sound similar to that produced by hitting a metal part with a metal rod, an envelope with a steep fall and a gentle rise is added to make the sound of a bell strike similar.

The mixing circuit must be equipped with a means for adding strength to each frequency component to be synthesized.

Although it is made to resemble a bell sound, it does not have the distinctive sound of a bell sound. The lack of resonance is a fatal flaw in a bell sound. The present invention eliminates the above drawbacks and makes it possible to produce a resonant bell-like sound, and an example of its configuration is shown in FIG.

In FIG. 2, 201 to 211 are 101 to 211 in FIG.
This is similar to 111.

The feature of the present invention lies in the triggering method of the envelope generation circuit, which includes 203 to 205 and 212 to 213 in FIG.
It is expressed in 212 and 213 are delay circuits for differentiating the phases of the trigger inputs to the envelope generation circuits 203, 204, and 205.

FIG. 3a shows the trigger input to the envelope generating circuit and the output waveforms from the generating circuits 103 to 105 in the conventional example (FIG. 1). FIG. 3b shows the envelope generating circuits 203 to 2 in the case of the circuit configuration (FIG. 2) according to the present invention.
These are the input and output waveforms to 05.

In FIG. 3a, since the trigger waveform 301 from the frequency dividing circuit 102 is commonly input to the envelope generating circuits 103 to 105, each waveform of f, f2, . . . m is generated at the same timing. The envelope to be attacked will be added.

302, 303, 304 On the other hand, in FIG. 3b according to the present invention, the frequency dividing circuit 20
2, the trigger waveform 305 from circuits 212, 213,
waveforms 306 and 307 with different phases
is being produced.

Therefore, envelope generation circuits 203, 204, 205
Trigger signals 305, 306, 307 are input to each of , and the waveforms of f, f2...fn are as follows:
Waveform envelopes 308, 309, and 310 are added. As mentioned above, since the trigger inputs to multiple envelope generation circuits can be input with different phases, the timing of the envelope attack can be adjusted for each frequency (
f,, f2...fn), can be different.

At that timing, the frequency component will be sounded more strongly than other frequency components, and as a result, each component to be synthesized will have a sound close to a single sound and a synthesized sound,
This occurs only when there are only synthesized sounds. I was able to make up for the lack of sound. In this way, it became possible to produce a resonant bell-like sound using an electronic circuit and an electroacoustic transducer such as a speaker.

[Brief explanation of the drawings] Fig. 1 is a diagram showing the pronunciation structure of a conventional bell imitation sound.
01 is an oscillation circuit, 102 is a frequency dividing circuit, 103 to 105 are envelope generation circuits, 106 to 108 are envelope adding circuits, 109 is a mixing circuit, 110 is an electroacoustic transducer drive circuit, and 111 is a speaker. It is an electroacoustic transducer. FIG. 2 is a pronunciation configuration diagram of a bell pseudotone according to an embodiment of the present invention, and 201 to 211 are 101 to 11 in FIG. 1.
This block is similar to 1, and 212 and 213 are delay circuits that change the phase of the trigger signal to the envelope generation circuit. FIG. 3 corresponds to FIGS. 1 and 2. The input and output waveforms of the envelope generation circuit,
3a is a time chart of FIG. 1, and FIG. 3b is a time chart of FIG. 2. Pr-r-map 2-multiple 3-similar Hiiragi 3-figure no

Claims (1)

[Claims] 1 an oscillation circuit, a frequency division circuit for receiving a signal from the oscillation circuit to obtain a desired frequency, a first envelope generation circuit for receiving a first frequency output from the frequency division circuit and generating an envelope waveform; a delay circuit that delays the frequency output of the frequency output circuit; a second envelope generation circuit that generates an envelope waveform based on the signal from the delay circuit; a first envelope adding circuit that applies an envelope to the signal;
a second envelope adding circuit that applies an envelope to the signal from the envelope generating circuit; a mixing circuit that combines the signal outputs from the first and second envelope adding circuits; and an electroacoustic device that drives the signal output from the mixing circuit. An electronic sounding device comprising: a transducer drive circuit; and an electroacoustic transducer that converts an electrical signal from the electroacoustic transducer drive circuit into an acoustic signal.