JPS63261394A - Electronic musical instrument - 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 electronic musical instruments, and more particularly to electronic musical instruments using the so-called key assigner method, which generates musical tones by assigning musical tones to limited sound generation channels. .

2. Description of the Related Art In recent years, electronic musical instruments have a limited number of sound generation channels, and a key assigner system has been widely used in which the generation of musical tones is assigned to these channels.

Such a conventional electronic musical instrument will be described below with reference to the drawings.

FIG. 4 shows the configuration of a conventional electronic musical instrument. Fourth
In the figure, 11 is a waveform generation section, 12 is an envelope generation section, 13 is a control section, 14 is a waveform multiplication section, 15 is a volume multiplication section, 16 is a volume control section, and 20 is a level detection section.

The operation of the electronic musical instrument configured as described above will be described below.

In accordance with key-on/off keyboard inputs, the control section 13 outputs signals instructing waveform generation and envelope generation to the waveform generation section 11 and envelope generation section 12, respectively. Here, the envelope generating section 12 is configured to sequentially read envelope waveforms stored in a memory in advance starting from the rising edge when the key is turned on.

Next, the waveform multiplier 14 multiplies the waveform data generated by the waveform generator 11 and the envelope data generated by the envelope generator 12, and then the volume multiplier 15 multiplies the volume data sent from the volume controller 16. and outputs the result as a musical sound waveform.

The level detection unit 20 compares the envelope data sequentially output from the envelope generation unit 12 with a preset threshold, and when the envelope data becomes less than the threshold, the level detection unit 20 sends an envelope to the control unit 13 to indicate the end of the envelope. Outputs a termination signal. When the envelope end signal is output, the control section 13 regards the channel as an empty channel and outputs a sound generation stop instruction signal to the envelope generation section 12 to stop the generation of envelope data, thereby stopping the output of musical sound waveforms.

Problem y to be solved by the invention: However, in the above configuration, in order to make the instruction to stop sounding correspond only to the envelope data, even though the same envelope data is used, as shown in FIGS. When the volume data is different, when the relative volume data is large, the output of the musical sound waveform is stopped by the envelope end signal even though the amplitude of the musical sound waveform is large; conversely, when the volume data is small, the musical sound waveform is stopped. Even if it becomes almost inaudible, it still takes time for the envelope end signal to be output, making it impossible to release the channel efficiently, and depending on the waveform to be sounded or the threshold setting level, comparison of musical sound waveforms may be difficult. There is a problem that the sound generation may stop at a place where the target is large, and therefore noise is generated.

In view of the above-mentioned problems, the present invention provides
Moreover, it is an object of the present invention to provide an electronic musical instrument that can efficiently release sound generation channels.

Means for Solving the Problems In order to solve the above problems, the electronic musical instrument of the present invention includes a waveform generation section that generates waveform data, an envelope generation section that generates envelope data, and an envelope generation section that generates envelope data according to a signal input from a keyboard. A control unit that outputs a generation instruction signal for causing the generation unit and the waveform generation unit to generate envelope data and waveform data, respectively, and a generation stop instruction signal to the envelope generation unit in accordance with the envelope end signal, and a control unit that multiplies the envelope data and the waveform data. a waveform multiplication section that multiplies the multiplication result by the volume data output from the volume control section and outputs the result as a musical sound waveform; and a zero crossing detection section that detects zero crossings of the musical sound waveform. , a volume control unit that sets volume data and a threshold value, and a level detection unit that compares envelope data and the threshold value.

Operation According to the present invention, envelope data and waveform data are sequentially outputted in response to a generation instruction from the control section with the above-described configuration. The waveform multiplier multiplies envelope data and waveform data, and the volume multiplier multiplies the result by volume data to obtain a musical tone waveform. On the other hand, when the envelope data becomes equal to or less than the threshold corresponding to the volume data and the zero-crossing detection section outputs a zero-crossing signal, the level detection section outputs an envelope end signal to the control section. The control section outputs a sound generation stop instruction signal in accordance with the envelope end signal, stops outputting the musical sound waveform, and releases the channel.

By repeating the above operations, musical tones can be obtained while effectively using the sound generation channels.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, 17 is a control section, 18 is a level detection section,
19 is a volume control section, and 21 is a zero crossing detection section. Furthermore, 1
1 is a waveform generation section, 12 is an envelope generation section, 14 is a waveform multiplication section, and 15 is a volume multiplication section, which are the same as the conventional configuration.

The operation of the electronic musical instrument configured as described above will be described below.

First, when the keyboard is pressed, the pitch of the musical note 1 strength and the key
Information regarding ON is input to the control unit 17 as a keyboard input. Next, the control section 17 outputs output instruction signals for starting output of waveform data and envelope data according to the input keyboard input to the waveform generation section 11 and the envelope generation section 12, respectively. When the output instruction signal is input, the waveform generating section 11 sequentially reads waveform data stored in a memory in advance and sends them to the waveform multiplier 14 .

Further, the envelope generating section 12, which has received the output instruction signal, sequentially reads envelope data related to the rise of musical tones stored in a memory in advance and sends them to the waveform multiplier 14. The waveform multiplier 14 multiplies the sequentially output waveform data and envelope data, and outputs the result to the volume multiplier 15.

Next, the volume multiplier 15 multiplies the volume data, such as the volume, instructed by the volume controller 19 by the transmitted multiplication result, and outputs the result as a musical tone waveform. Further, the level detection section 18 inputs the envelope data sequentially outputted from the envelope generation section 12, and sequentially compares the envelope data with a threshold value sent from the volume control section 19 indicating the end of the envelope. At this time, when the envelope data becomes equal to or less than the threshold value and a zero-crossing signal is output from the zero-crossing detecting section 21, the level detecting section 18 sends an envelope end signal to the control section 17. Here, the threshold value sent from the volume control section 19 corresponds to the volume data.

When the envelope end signal is output, the control section 17 regards the channel as an empty channel and sends a sound generation stop instruction signal to the envelope generation section 12 to stop the output of musical sound waveforms. Note that the same operation is possible even if the value of the envelope data is forcibly set to zero by the sound generation stop instruction signal.

FIGS. 2 and 3 show musical sound waveforms and envelope data created by this embodiment. FIG. 2 shows a case where the ratio/occlusal volume data is large, and FIG. 3 shows a case where the volume data is small, and the envelope data are the same. As is clear from the figure, even when the absolute level of the musical sound waveform is small, the waiting time until the channel is released may become longer than necessary because the threshold value corresponding to the volume data is given to the level detection unit 18. Moreover, even when the absolute level of the musical sound waveform is high, the sound generation can be stopped at a threshold value at which the noise is not audible.

Effects of the Invention The present invention sets a threshold value indicating the end of the envelope in accordance with the volume data instructed by the volume control section, compares the envelope data with the threshold value, and detects the zero crossing of the musical sound waveform. Since the sound generation is stopped, the waiting time in the trench where the sound channel is released is shortened.
In addition, this can be done without causing noise due to the stoppage of sound production, and therefore the limited sound generation channels can be used effectively, reducing the burden on LSIs equipped to process multiple channels at high speed. be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic musical instrument according to an embodiment of the present invention, FIGS. 2 and 3 are envelope data and musical sound waveform diagrams generated in the electronic musical instrument shown in FIG. 1, and FIG. 4 is a diagram of a conventional electronic musical instrument. Block diagram of electronic musical instrument, Figures 5 and 6
The figure shows envelope data and musical sound waveform diagrams of a conventional electronic musical instrument. 11... Waveform generation section, 12... Envelope generation section, 13.17... Control section, 14.
... Waveform multiplication section, 16 ... Volume multiplication section,
16.19...Volume control details, 18,20...
. . . Level detection section, 21 . . . Zero crossing detection section. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 r”/] 'X 3 Figure Iτ51 No. 1 No. 61 No. J

Claims (1)

[Claims] an envelope generator that generates envelope data;
A waveform generating section that generates waveform data, and outputting a generation instruction signal for generating envelope data and waveform data to the envelope generating section and the waveform generating section, respectively, according to a signal input from a keyboard, and instructing the end of the envelope. a control unit that outputs a sound generation stop instruction signal for stopping envelope generation according to an envelope end signal; and a waveform multiplier that multiplies the envelope data output from the envelope generation unit and the waveform data output from the waveform generation unit. a volume multiplier that multiplies the multiplication result obtained by the waveform multiplier by volume data and outputs the result as a musical sound waveform; and a volume multiplier that detects zero crossings of the musical sound waveform and outputs a zero crossing signal. a zero crossing detection section; a volume control section that instructs the volume multiplication section with volume data and sets a threshold value for instructing the end of the output envelope; detecting that the output envelope data is less than or equal to the threshold by comparing it with a threshold, and
an electronic musical instrument comprising: a level detection section that outputs an envelope end signal indicating the end of an envelope to the control section by receiving the zero crossing signal output from the zero crossing detection section;