JPH039398A - Rhythm reproducing device for digital musical sound - Google Patents

Abstract

PURPOSE:To compress musical sound information to a small amount by setting plural kinds of rhythm patterns, and storing them as a bit map in the device, and properly reading them according to rhythm codes in the musical sound information. CONSTITUTION:A CPU 4 processes the melody part of the musical sound infor mation as the counted value of a counter 3 proceeds and the processed part is outputted from an I/O port 7 to a sound source 8; and specified rhythm patterns are read out of a rhythm pattern table 6 according to rhythm codes specified in the musical sound information and processed by the CPU 4 accord ing to the counted value. Consequently, a pattern is specified once, then the rhythm pattern is maintained unless information for alteration is inputted, there by reducing the amount of the information on the whole.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an efficient way to reproduce the rhythm of drums without using a large amount of information when playing digital information obtained by encoding music in binary on a playback device. This invention relates to a rhythm reproduction device that can reproduce rhythms well.

[Conventional technology and its problems]

Generally, when playing digital information that is binary encoded music, the information is analyzed and processed by the CPU, inputted to a sound source such as a synthesizer, and then converted to an analog signal before being output by the playback device. I do. In addition, in order to perform music binary encoding in this case, the performance is reorganized into data in chronological order7, which results in a huge amount of information.Therefore, it is necessary to store this data in advance. If you try to input data into the device, a considerable capacity is required. Furthermore, if you plan to store this data as a database in the host combinator and download it to a terminal device using a public line as necessary, - transmission of data for one song. This not only increases the overall processing time, but also increases the cost of using public telephone lines.

By the way, aside from complicated music for appreciation, j, 7,
For example, since karaoke music is intended for amateur singing, the drum section does not use complex rhythms and is relatively simple. Therefore, even in the case of karaoke music, which requires consideration of many genres, the rhythm patterns of the drum section can be summarized into several dozen representative patterns.

The present inventor focused on this point, and once a pattern is specified from among the preset drum section rhythm patterns, that rhythm pattern is maintained unless change information is input, and the amount of information is compressed as a whole. The purpose of this invention is to provide a digital music rhythm reproduction device that can reproduce rhythms of digital music.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a counter that is integrated at a constant period by a timer obtained by dividing a clock, and a plurality of counters that have parallel output timings for each part of each drum section for one period of this counter. It is said to consist of a CPU that processes rhythm patterns identified from among these multiple rhythm patterns in parallel in time series according to the accumulated count value of the counter, and an I10 port that serially outputs the signal from this CPU to the sound source. using means.

[Use] In the above means, the counter serves as a time reference for the progress of the music, and has the function of regulating the tempo according to its cycle. The music progresses and the melody is played according to the progress of this counter, but since the rhythm pattern has an output timing that matches the counter cycle, the rhythm progresses as well, being regulated by the progress of the tempo by the counter. do. The rhythm patterns are arranged in parallel in chronological order, and the CPU functions to reproduce the rhythm according to the accumulated count value of the counter.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the attached drawings.In the block diagram schematically showing the present reproduction apparatus in FIG.
1 is a clock, which is configured as an internal clock of the CPU or an external clock.

2 is a timer that divides the clock 1 to form a signal at constant intervals; 3 is a counter that is accumulated by timer 2; it has a constant cycle, and repeats the cycle by integrating the count value; 1 in this embodiment; The cycle is 192 counts. 4 is a CPU for managing the time of the entire reproduction device and outputting signals; 5 is a storage device for storing binary encoded music information for one song; this music information includes information related to the rhythm of the drum section; Information is also included.

Reference numeral 6 denotes a rhythm pattern table which specifies the rhythm and strength of sound for each part of the drum section and stores a plurality of rhythm patterns having output timings corresponding to the number of counts for one cycle of the counter 3, and is composed of a bit map. ing.

7 is an I/O port for serially outputting music information processed in parallel by the CPU, and 8 is a sound source for converting serially inputted music information into an analog signal and reproducing it as music.

In the above configuration, an example of the rhythm pattern when reproducing the rhythm of the drum section is shown in Figure 2. Here, the drum section consists of six types of instruments: bass drum, snare drum, tom-tom x 2, cymbal, and bibat. There are two types of buy-butts: a closed sound and an open sound, for a total of seven rhythm sounds. Further, since the output timing is made to match the cycle of the counter 3, it is possible to advance the melody according to the count value and to advance the rhythm in synchronization with this. In the dynamics data, O indicates that there is no output for that part, and a positive integer indicates that there is an output, and also indicates the strength value of the sound. One rhythm pattern is formed using the bit map shown in FIG. 2, and by preparing a plurality of types in advance, it is possible to adapt the pattern to the rhythm of general music.

By the way, since the CPU 4, which controls the entire reproduction apparatus, is driven by an internal clock, various processes are limited by the time axis. Therefore, a fairly fast CPU
Unless the CPU is actually used, if each part of the drum section is processed sequentially, there will be a discrepancy between the melody and the rhythm, making it impossible to play the music properly. L7 mau. Therefore, in the present invention, the actual rhythm processing is performed by replacing the bit Mazda in Figure 2 by 90 degrees with i, 5, and using continuous bits consisting of 7 bytes of strength information of all parts according to the output timing.
Figure 3 shows the actual pitch map stored in the rhythm pattern table (j).
The address specifies the output timing and the capacity of the strength data, followed by 7 bytes specifying the strength information. The rhythm pattern table 6 stores a plurality of types of such bitmaps.

In this reproduction device configured as 5″, the counter 3
A part of the melody of the music information is processed by CP tJ 4 according to the progression of the count value, and is output from the I/Q boat 7 to the sound source 8, and is specified from the rhythm pattern table 6 by the rhythm code specified in the music information. Read the rhythm patternj5 and follow it according to the count valueU
It is processed by CPLI4. Here, even if the rhythm changes, if you specify the rhythm code for each number in the music information, you can reproduce the rhythm after the change. Even if the rhythm changes, as long as it is accommodated as a rhythm pattern, it will be possible to respond appropriately.

〔Effect of the invention〕

In the present invention, a plurality of types of drum beats are set in advance.
Since the rhythm codes contained in the music information are stored in the device and read out at any time, the volume of music information can be compressed to an extremely small capacity. Even when transmitting music information, it is possible to shorten the transmission time and reduce line usage fees.

In addition, since the rhythm is reproduced according to the count value of the counter that serves as the standard for music progression, it is possible to perfectly match the melody progression and rhythm progression regardless of the processing capacity of the CPU. This has brought about various significant effects, such as making it possible to provide a reproduction device.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of the device of the present invention;
FIG. 2 is a hitmap diagram of the rhythm pattern, and FIG. 3 is a bitmap diagram of the rhythm pattern actually stored in the table. In the figure, 1... clock, 2... timer, 3...
Counter, 4... CPU, s... Storage device, 6...
・Rhythm pattern table, 7...I/O port, 8
···sound source. ``2''

Claims (1)

[Claims] 1. A counter 3 that is integrated at a constant cycle by a timer 2 which is a frequency division of the clock 1, a plurality of rhythm patterns having parallel output timings for each part of each drum section in one cycle of this counter, and these multiple rhythms. A digital device characterized by comprising a CPU 4 that processes rhythm patterns identified among the patterns in parallel in time series according to the accumulated count value of the counter, and an I/O port 7 that serially outputs signals from the CPU to a sound source 8. Musical rhythm reproduction device.