JPH0712954Y2 - Melody generation circuit - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION The present invention relates to a melody generating circuit.

2. Description of the Related Art Conventionally, there are some which play an alarm sound and a time signal sound by electronic melody.

[Problems to be Solved by the Invention] This is because the performance is performed only with frequency signals corresponding to the scale of the melody, so the frequency spectrum contains only odd harmonics, and so-called electronic monotonous tones are obtained. there were. Therefore, an object of the present invention is to provide a melody generating circuit that can generate a high-quality onomatopoeia that is true to the original sound.

According to the present invention, a variable frequency divider generates a signal having a frequency sufficiently higher than the pitch of a sound to be generated based on the melody information read from a storage circuit, and is unique to a specific sound. Ri Oh defining the division ratio based on the frequency spectrum, corresponding to the sound and its harmonic components circumference of
The output signal of the variable frequency divider is supplied to a plurality of frequency dividers that generate a wave number signal, and the output signals from the respective frequency dividers are weighted and combined according to the strength of the frequency spectrum. You have achieved your purpose.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Q is an oscillator, D1 and D2 are frequency dividers, DR is a drive circuit for the motor M, and the motor M is for rotationally driving a time display pointer (not shown). ML is a melody circuit, which stores melody information of Westminster chime, for example. A is a control circuit for reading out melody information, and VD1 and VD2 are variable frequency dividers. In this example, the melody information is played by a sticky sound of a bar-ring, and its frequency spectrum distribution is f0, (fundamental frequency), 2f.
0,10f0 / 3,5f0 ... (Harmonic components) . Therefore, the variable frequency dividers VD1 and VD generate signals with a frequency 10f0 which is 10 times the frequency corresponding to the scale, and the frequency division ratios are 1/2, 1/3, 1/5 and 1/1, respectively.
0 frequency dividers D11-D14 and frequency dividers D21-D24
Is being supplied to. Therefore, the frequency dividers D11 to D14 and D21 to D24 respectively output 5f0 and 10f0 /
Frequency signals of 3, 2f0 and f0 are generated. Each frequency divider D
Outputs of 11 to D14 and D21 to D24 are connected to resistors R11 to R14 and R21 to via envelope circuits E1 and E2.
R24 is provided, and each resistance value is set to a value inversely proportional to the strength of the frequency spectrum. Each frequency divider D11 to D
14, the outputs of D21 to D24 are envelope circuits E1,
It is supplied to the resistors R11 to R14 and R21 to R24 via E2 and played by the sounding device SP. Envelope circuit E
1, E2 and resistors R11 to R14 and R21 to R24 form a synthesizing circuit. In the above configuration,
The control circuit A operates by the output of a switch (not shown) that operates at the alarm time or on the hour, and sequentially reads the melody information in the melody circuit ML. The read melody information is alternately divided by the variable frequency dividers VD1 and VD.
It is supplied to D2. This is because if the variable divider is only one line, the sound will be cut off in the middle of the envelope and will switch to the next sound, so the previous sound and the subsequent sound will not overlap and a comfortable growl cannot be made. Therefore, the above-mentioned drawbacks are avoided by alternately using the two series of variable frequency dividers as described above. From the variable frequency dividers VD1 and VD2, signals having a frequency 10 times the scale frequency are generated by the melody information, and the frequency dividers D11 to D14 and D are generated.
A signal having a frequency corresponding to the frequency spectrum of rod phosphorus is generated from 21 to D24. Further, the signals of the respective frequencies pass through the envelope circuits E1 and E2 and then the resistors R11 to R11.
The voltage is lowered to a voltage corresponding to the intensity of the spectrum by R14 and R21 to R24, and is sounded by the sounding device SP. Although the above embodiment has described the case where a pseudo-ring sound is generated, the present invention is not limited to this, and a pseudo sound such as a bell sound may be synthesized.

As described above, according to the present invention, the frequency spectrum of the harmonic component in addition to the fundamental sound can be arbitrarily set by the frequency division ratio of the frequency divider, and can be changed according to the strength of the frequency spectrum. Since the output signal of the frequency divider is weighted and combined, a tone color faithful to the original sound can be produced, and a very high-quality onomatopoeia can be generated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 VD1, VD2 ... Variable frequency divider A ... Control circuit ML ... Memory circuit D11-D14, D21-D24 ... Frequency divider

Claims (1)

[Scope of utility model registration request] 1. A memory circuit for storing melody information, a control circuit for sequentially reading the melody information from the memory circuit, and a signal having a frequency sufficiently higher than the pitch of a tone to be generated based on the read melody information. a variable frequency divider, the variable frequency of the frequency signal from the frequency divider as an input defining the division ratio based on the characteristic of the frequency spectrum to a specific acoustic Ah is, corresponding to the harmonic components of the sound and the sound Lap
A melody generating circuit comprising a plurality of frequency dividers for generating wave number signals, and a synthesizing circuit for weighting and synthesizing the output signals from the respective frequency dividers according to the strength of the frequency spectrum. .