JPH08254983A - Musical sound generating device - Google Patents

Abstract

PURPOSE: To provide a musical sound generating device having a new idea with which the music corresponding to visual sense is automatically generated and to provide the musical sound generating device capable of generating a sound having a new change. CONSTITUTION: This device is provided with a means inputting a video signal 1, a sampling means 2 outputting plural sampled signals as to the video signal or the signal obtained by processing the video signal as waveform data forming the waveform of a musical signal while compressing or reducing the information quantiy of the sampled signals rather than the video signal, a storage means 5, write means 3, 4, 7 writing the waveform data consisting of plural sampled signals in the storage means 5 and a readout means 6 successively reading out respective sampled signals constituting the waveform data stored in the storage means 5 and generates a musical sound by forming a musical signal while using the waveform data read out of the storage means 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone generating apparatus used for electronic musical instruments, game machines and the like, and more particularly to a musical tone generating apparatus for generating a new sound related to an image.

[0002]

2. Description of the Related Art Conventionally, an apparatus for automatically expressing a musical sound corresponding to an image has not been realized.

Recently, various synthetic sounds have been created,
Along with this, new fields of music are being opened up.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a musical tone generating device of a novel idea which automatically generates a sound corresponding to the visual sense.

Another object of the present invention is to provide a musical tone generating device capable of generating a new and varied tone.

[0006]

In order to achieve the above object, the tone generating apparatus of the present invention comprises a plurality of means for inputting a video signal and a plurality of means for processing the video signal or a modified version thereof. Sampling means for compressing or reducing the amount of information of the sample signal as waveform data forming a waveform of a musical tone signal and outputting the sample signal, rewritable storage means such as RAM, and the plurality of storage means The writing means for writing the waveform data consisting of the sample signal and the reading means for sequentially reading out the sample signals constituting the waveform data stored in the storage means are read out from the storage means. It is characterized in that a musical tone signal is formed by using waveform data to generate a musical tone.

This tone generator can be applied to a conventional tone generator of the waveform memory reading system, but since the video signal has a much larger amount of information than the audio signal, the present invention thins out the video signal. By sampling or the like, the amount of information can be compressed or reduced to a degree necessary for reproducing the audio signal to form waveform data. A plurality of sample signals of a video signal processed, for example, when the video is a moving image,
An average value of video signals of one screen or one field is used as a sample signal, and a plurality of samples are sampled. You may make it write such a sample signal in a memory | storage means as one or several data in waveform data. The waveform data corresponds to a waveform of a half wavelength or one wavelength in a musical tone signal and forms a waveform of the musical tone signal, and therefore directly determines characteristics such as the tone color of the musical tone. .

It does not matter whether the video information to be sampled is an analog signal or a digital signal. However, when the video information is an analog signal, a sampling cycle (for example, 0.1 to 0.5) for normal A / D conversion is usually used. Sampling is performed at a sufficiently longer period (eg, 30 to 10 μS). For example, sampling may be performed at the same sampling period as an audio A / D converter used in PCM recording or the like. In this case, although the video information changes within the sampling period, it is averaged or the peak value is detected according to the configuration of the sampling circuit. When the video information is a digital signal, the required number of digital data may be appropriately extracted.

According to the above construction, for example, in the tone generating apparatus of the waveform memory reading type, the contents of the waveform memory can be rewritten and stored according to the image information, and when reading the contents of the waveform memory, the conventional method is used. As in the case of the tone generator of the waveform memory reading type, the waveform of one tone or a half wave of the tone may be read.

[0010]

Therefore, according to the present invention, a musical sound is expressed in correspondence with an image. Also, since the timbre changes according to the image, various new sounds can be created.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a sound source according to an embodiment of the present invention. The apparatus shown in the figure has a video signal source 1 for outputting a video signal as video information, a thinning sampling circuit 2, an A / D conversion circuit 3, a write buffer 4, a waveform memory 5, a read buffer 6 and write / read control. The circuit 7 and the like are provided. For example, the waveform data as shown in FIG. 2B is obtained by performing thinning sampling n times during one horizontal synchronizing period of the video signal as shown in FIG. 2A, and the waveform data is made into a tone waveform. It is a thing.

Next, the operation of the apparatus shown in FIG. 1 will be described. The sampling circuit 2 samples a video signal input from a video signal source 1 such as a TV camera or a VTR, and includes a gate that opens and closes according to a sampling pulse. This sampling pulse has a frequency of n × 15.75 KHz in synchronism with the horizontal period signal of the video signal, where n is the number of sampling points in one period of the horizontal synchronizing signal.

That is, the sampling circuit 2 samples and holds n video sample signals corresponding to the peak value of the video signal within the open period of the gate in one horizontal scanning period of the video signal.
The A / D conversion circuit 3 A / D converts this video sample signal and outputs it to the write buffer 4 as waveform data. The write buffer 4 temporarily stores this waveform data until the next waveform data is input.

The write / read control circuit 7 receives a write command from a CPU (not shown) of the electronic musical instrument body when writing waveform data. As a result, the write / read control circuit 7 sets an address pointer (not shown) for accessing the waveform memory 5 at the beginning address of the waveform memory 5 at the same time when the horizontal synchronizing signal is input, and the first time After the video sample data temporarily stored in the write buffer 4 when the sampling is performed is written to the address designated by the address pointer of the waveform memory 5, the address pointer is incremented until the next sampling is performed. stand by. Thereafter, every time n samplings are sequentially performed, the writing to the waveform memory 5 and the stepping of the address pointer are repeated, and when the next horizontal synchronizing signal is input, the writing operation is completed. As a result, waveform data corresponding to one screen of the video signal is written in the waveform memory 5.
When an interlace (interlaced scanning) type video signal is used, the first horizontal synchronizing signal in the even field is detected and the address pointer is incremented there to write the waveform data in both the odd field and the even field. Two fields that are continuous while advancing the rear address pointer by two, that is, one frame (screen)
The above write operation is performed.

When reading the waveform data, the CP on the main body side
Pitch data is input from U. Write / read control circuit 7
Causes the address pointer to step forward at a speed corresponding to the pitch indicated by the pitch data, and the address of the waveform memory 5 is designated by the contents of the address pointer to sequentially read the data. After that, the above procedure is repeated until the tone generation stop command (key-off data) is input, and the waveform memory 5
The waveform data written in is repeatedly read.

The read video sample data is sent to the electronic musical instrument body as musical tone waveform data through the reading buffer 6, and an envelope is added to the electronic musical instrument body.
After mixing with musical tone waveform data from another sound source and processing such as D / A conversion, the sound is sounded through an audio circuit (not shown).

As described above, by using the video signal in the horizontal synchronizing signal as the waveform of one or a half cycle of the musical tone waveform, the musical tone waveform corresponding to the change of the screen can be created, and the screen and the sound are corresponded to each other. Can be made.

In the above description, an example in which a video signal for one screen is made to correspond to a musical tone signal for a half wavelength or one wavelength has been described, but, for example, when the image is a moving image,
You may make it write the average value of the video signal of 1 screen or 1 field as one or several data of the waveform memory 5. In this case, the movement of the video for several minutes is expressed within one wavelength of the musical sound. Further, the field of application may be widely used not only for electronic musical instruments but also for game materials such as images (visual) and musical sounds (auditory).

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a playing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between input and output waveforms of the device of FIG.

[Explanation of symbols]

1: video signal source, 2: thinning sampling circuit, 3:
A / D conversion circuit, 4: write buffer, 5: waveform memory,
6: read buffer, 7: write / read control circuit.

Claims (1)

[Claims] 1. A means for inputting a video signal, and a plurality of sample signals of the video signal or a signal obtained by processing the video signal as waveform data for forming a waveform of a musical tone signal, the amount of information of which is greater than that of the video signal. Sampling means for compressing or reducing the output, storage means, writing means for writing waveform data composed of the plurality of sample signals in the storage means, and the waveform data stored in the storage means A musical tone generating apparatus comprising: a reading means for sequentially reading each sampled signal, and a musical tone signal is formed by using the waveform data read from the storage means to generate a musical tone.