JPH0347518B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a device for generating a modulation signal for imparting a modulation effect to a musical tone signal in an electronic musical instrument, a musical tone effect imparting device, or the like. [Prior art] In electronic musical instruments, vibrato, tremolo,
A large number of modulation waveform generators are used to provide various modulation effects such as ensemble. For example, Japanese Patent Application Laid-Open No. 112313/1983 discloses that separate modulation waveform generators are provided for each modulation effect of frequency modulation, timbre modulation, and amplitude modulation. In addition, in Utility Model Publication No. 53-13382, multiple series of modulated waveform generators are installed separately, and the phase of the modulated waveform signal generated by each system is shifted by a predetermined amount, and multiple modulated waveform signals with different frequencies or phases are synthesized. It has been shown that a special modulated waveform signal can be obtained by
Furthermore, Japanese Utility Model Application No. 57-88193 discloses providing a separate modulation waveform generator for each of a plurality of tone generation sequences. Further, Japanese Patent Application Laid-open No. 83894/1983 discloses that a plurality of modulation signals are generated in a time-division manner and that different modulations are applied to a plurality of input signals in a time-division manner. Japanese Patent Laid-Open No. 57-99696 discloses forcibly synchronizing the phases of modulated signals independently generated in a plurality of sequences. [Problems to be Solved by the Invention] Synchronous control is control that can be used in various aspects of performance. For example, when generating modulation signals independently on each channel, if you want to obtain modulation signals with completely synchronized frequencies on different channels, it is advantageous to stop generating them independently and use the synchronization control function to generate them synchronously. Yes, it is certain. There are various cases in which it is desired to obtain modulated signals of completely synchronized frequencies on different channels. for example,
When there is a one-to-one correspondence between musical tone generation channels and modulation signal generation channels for generating multiple tones, it may be desirable to perform completely synchronized modulation in any one or more of the tone generation channels. For example, when musical tones corresponding to the same pressed key are assigned to multiple channels and played simultaneously with different tones, etc., modulation effects such as vibrato may be applied to each note in perfect synchronization with the key pressed timing. . This also applies to cases where it is desired to apply modulation effects such as vibrato to chord constituent notes assigned to multiple channels in complete synchronization. This also applies when it is desired to group musical sound generation channels and apply synchronized modulation effects to each group. In this way, when generating modulation signals independently on each channel, when it is desired to obtain modulation signals with completely synchronized frequencies on different channels at various stages of the performance, this can be efficiently synchronously generated. Therefore, it is necessary to have a synchronous control function. However, with conventional synchronization control, it is not possible to freely change the settings of the channels to be synchronized.
Because it was fixed, it was not possible to satisfactorily meet the above-mentioned demands for synchronization control in various aspects of performance. This invention was made in view of the above points,
A modulation signal that allows the modulation signals of these arbitrary channels to be generated synchronously when it is desired to obtain modulation signals with completely synchronized frequencies on arbitrary different channels when the modulation signals are generated independently on each channel. The purpose is to provide a generator. [Means for Solving the Problems] A modulation signal generation device of the present invention includes a waveform table that stores predetermined waveforms, and a time division channel that sets the time division timing of a plurality of channels for generating a modulation waveform signal. a setting means, a frequency setting means for setting the frequency of the modulation waveform signal to be generated in each channel, and a frequency setting means for setting the frequency of the modulation waveform signal to be generated in each channel, and controlling the time division channel according to the frequency set corresponding to each channel by the frequency setting means. A readout means for reading out the waveform signal for each channel from the waveform table at the time division timing set by the setting means, and a channel for synchronizing the frequency of the modulation waveform signal to be generated; Regarding a synchronization channel setting means capable of changing the setting contents of the channel to be synchronized, and a certain second channel set to be synchronized with a certain first channel in the synchronization channel setting means, and synchronous control means for controlling the reading means so that reading is performed in synchronization with reading of the first channel. [Operation] Waveform signals are read out from the waveform table in a time-division manner for each channel according to the frequency set for each channel. The waveform signals for each channel thus read out are used as modulation signals. Therefore, a plurality of modulation signals can be generated independently with a simple configuration. Reading of a waveform table for a certain second channel is performed in synchronization with waveform reading for another certain first channel instead of the frequency set corresponding to this second channel. It becomes like this. Therefore, while it is possible to generate independent modulation signals for each channel, it is also possible to easily control the modulation signals of arbitrary channels to be generated synchronously. In this case, the synchronization channel setting means allows you to change the settings of the channels to be synchronized, so that you can set completely synchronized frequencies on desired different channels depending on the purpose in various performance situations. The synchronization channel can be variably set so as to obtain a modulation signal of 100%, thereby making it possible to fully meet the demands for synchronization control in various aspects of performance. [Embodiment] In FIG. 1, a channel counter 1 corresponds to a time division channel setting means for setting time division timings of a plurality of channels, and if the number of channels is 16, it consists of a modulus 16 counter, Channel number data from 0 to 15 by counting master clock pulse φ _M
CHD occurs sequentially in a time-sharing manner. FIG. 2 is a diagram showing how channel number data CHD changes in response to master clock pulse φ _M.
Sixteen modulated signals are generated independently in 16 time-divided channels from 0 to 15. The waveform table 2 stores one or more different waveforms (for example, sine waves, triangular waves, etc.), and if multiple waveforms are stored, one waveform to be read is the waveform selection table, as described later. It is selected according to the waveform selection data WSEL from 3. A reading means for reading out the waveform table 2 includes a random access memory (hereinafter referred to as RAM) 4 and an adder 5. RAM 4 has addresses for storing phase address data gF for reading the waveform table for the number of channels, and the write address input WA has channel number data output from channel counter 1.
CHD is applied, and the output of a synchronous channel table 6, which will be described later, is applied to the read address input RA. The readout output of RAM4 is given to adder 5,
The output of the adder 5 is applied to the phase address input of the waveform table 2 via an adder for phase shift, and is also applied to the data write input of the RAM 4. The other input of the adder 5 is that frequency data F, which is an increment value (change value) of the phase address data gF per calculation unit time, is input to the frequency data table 8.
through gate 9. The frequency data table 8 stores frequency data F that sets the frequency of the waveform signal to be read from the waveform table 2 for each channel, and the frequency data F of each channel is time-divisionally divided according to the channel number data CHD. is read out. Gate 9 is provided for synchronous control, as will be described later, and is normally open (when synchronous control is not performed), and sends frequency data F read from table 8 to adder 5. supply,
Frequency data F is repeatedly added (or subtracted) in a phase accumulator constituted by RAM 4 and adder 5. In other words,
Normal read control of the waveform table 2 involves specifying a certain channel as the read address of the RAM 4 in the time slot of the channel, reading out the previous phase address data (g-1) F for the channel from the RAM 4, and reading the data from the adder 5.
Add frequency data F to this to obtain new phase address data gF (where g is a number that changes sequentially as 1, 2, 3, etc. for each calculation unit time and indicates the number of times F is accumulated), On the other hand, the channel is specified as the write address of the RAM 4, and the obtained phase address data gF is stored in the address of the channel. In this way, frequency data F is independently accumulated in a time-division manner for each channel, and phase address data gF that successively changes at a rate of change corresponding to the set frequency is obtained in a time-division manner for each channel. As we know, RAM
4 and an adder 5 has a predetermined modulo number, and the phase address data gF changes repeatedly using this modulo number as one cycle. The synchronization channel table 6 contains, for each channel, channel number data (synchronization channel data) to which the waveform signal of that channel should be synchronized.
The synchronized channel data CHD for each channel is read out in a time-division manner according to the channel number data CHD given from the counter 1. An example of the setting contents of this table 6 is shown in the following table. Of course, the setting is not limited to this and can be set in any manner.

[Table] Channels in which synchronized channel data SCHD with the same value as own channel number data CHD are stored (0, 5, 6, 7, 8, 9,
10, 12, 13, 14, 15) means that the waveform table 2 should be read out by the above-mentioned normal readout control without performing synchronous readout control. data
Channels with different CHD and SCHD values (1, 2, 3, 4, 11 in the table above) mean that synchronous read control should be performed. The synchronous channel data SCHD read from the synchronous channel table 6 is applied to one input of the comparator 10, and is also applied to the read address input RA of the RAM 4 as described above. Comparator 10
The channel number data CHD from the counter 1 is applied to the other input of the counter 1. The comparator 10 generates a match signal EQ of "1" when the values of both inputs match,
This opens gate 9. When there is no match, the match signal EQ is "0" and the gate 9 is not opened. To explain normal read control using channel 6 in Table 1 as an example, the synchronous channel data SCHD read from the synchronous channel table 6 in the time division time slot of channel 6.
Since the value of is "6", which is the same as the value of the channel number data CHD at that time, the match signal EQ is output from the comparator 10, the gate 9 is opened, and the frequency data F of channel 6 is given to the adder 5. It will be done. At this time, input the write address of RAM4.
Channel number data CHD specifying the same channel 6 and synchronous channel data SCHD are input to WA and read address input RA. Therefore, as described above, in the time division time slot of channel 6, the frequency data F of channel 6 is repeatedly added, and the phase address data corresponding to the frequency set for channel 6 is obtained.
gF is generated. To explain the synchronous read control using channel 1 in Table 1 as an example, the value "6" of the synchronous channel data SCHD read from table 6 in the time-division time slot of channel 1 corresponds to the value of the channel number data CHD at that time. Since the value is different from "1", the coincidence signal EQ is not output, the gate 9 is closed, and the frequency data F is not provided to the adder 5. On the other hand, the read address input RA of RAM4 has data indicating channel "6".
Since SCHD is given, the phase address data gF of channel 6 is read out from RAM 4 even though it is the time division timing of channel 1, and this is passed through adders 5 and 7 to become the phase address data of channel 1. as waveform table 2
is input. In this way, the phase address data gF for reading the wave number table of channel 1 is forcibly synchronized with the phase address data gF of channel 6, and the frequencies of both channels become the same. The phase shift table 11 stores initial phase data θ for each channel, which sets the initial phase of the waveform signal of each channel, and stores the initial phase data θ of each channel according to the channel number data CHD from the counter 1. is read out in a time-division manner.
This initial phase data θ is given to an adder 7 and added to the phase address data gF from the adder 5. The output gF+θ of the adder 7 is applied to the phase address input of the waveform table 2. In this way, phase address data for reading waveform table 2
gF is phase-shifted independently for each channel according to the initial phase data θ for each channel, and independent phase shift control is realized for each channel. The waveform selection table 3 is provided when a plurality of different waveforms are stored in the waveform table 2, and stores waveform selection data WSEL for each channel for selecting a waveform to be read out. Read out in a time-division manner according to channel number data CHD. When there is only one type of wave number stored in the waveform table 2, this waveform is read out in a time-division manner according to the phase address data gF+θ (gF when θ is 0) of each channel. When multiple types of waveforms are stored in the waveform table 2, the waveforms are selected in a time-sharing manner by the waveform selection data WSEL for each channel, and the selected waveforms are stored in the phase address data corresponding to the channel. It is read out according to gF+θ (or gF). The waveform signals of each channel read out in a time-division manner from the waveform table 2 are sent to an adder 12 for waveform synthesis.
is input. The output of the adder 12 is supplied to an appropriate modulation effect imparting circuit (not shown) as an output signal (that is, a modulation signal) of the modulation signal generator, and is also input to the register 13. register 13
is for delaying the waveform signal of each channel by the time slot length of one channel, and captures and processes the waveform signal for each channel at the end of the time slot of each channel according to the master clock pulse φ _M. The input waveform signal is output during the time slot of the next channel.
The output of the synthesis control table 14 is given to the clear input of this register 13.
When this clear input signal is “1”, register 1
The waveform signal of the previous channel is given to the adder 12 from the register 13 without clearing the contents of 3. However, when it is "0", the contents of the register 13 are cleared and the waveform signal of the previous channel is added. Vessel 1
Avoid being given to 2. The synthesis control table 14 stores synthesis control data MXD for each channel, which indicates whether or not to add and synthesize the waveform signal of the previous channel and the waveform signal of the own channel. Channel synthesis control data
Read MXD in a time-sharing manner. This data MXD
is "1" when the waveform signal of the previous channel and the waveform signal of the own channel should be added and synthesized, and is "0" otherwise. table 14
An example of the settings is shown in the table below.

〔Effect of the invention〕

As described above, according to the present invention, when a modulation signal is generated independently in each channel, it is possible to freely change the settings of the channels to be synchronized. The synchronization channel can be set variably to obtain completely synchronized frequency modulation signals in different channels as desired, which is sufficient to meet the demands for synchronization control in various aspects of the performance. This has the excellent effect of making it possible to respond.

[Brief explanation of drawings]

FIG. 1 is an electrical block diagram showing an embodiment of a modulated signal generator according to the present invention, FIG. 2 is a timing chart showing the status of time-division time slots of each channel in the same embodiment, and FIG. 3 is the same. FIG. 4 is a block diagram showing a modification of the delay means for waveform synthesis in the embodiment, and FIG. 4 is a block diagram showing a modification of the synchronization control circuit portion in FIG. 1. 1... Channel counter, 2... Waveform table, 3... Waveform selection table, 4, 5... RAM and adder for generating phase address data for reading the waveform table, 6... Synchronous channel table, 7... ... Adder for phase shift, 8 ... Frequency data table, 9, 10 ... Gate and comparator for synchronization control, 11 ... Phase shift table, 12,
13...Register as an adder and delay means for waveform synthesis, 14...Synthesis control table, 15...
...Shift register, 16...Selector, 17...
Table setting device.

Claims (1)

[Scope of Claims] 1. A waveform table storing predetermined waveforms; time-division channel setting means for setting time-division timing of a plurality of channels for generating modulation waveform signals; and a waveform to be generated in each channel. a frequency setting means for setting a frequency of a modulating waveform signal; and a time division timing set by the time division channel setting means according to the frequency set corresponding to each channel by the frequency setting means; A reading means for reading out the waveform signals for each channel from the waveform table, and a channel for setting the frequency of the modulation waveform signal to be generated is to be synchronized, and the settings of the channels to be synchronized are changed. a synchronous channel setting means capable of configuring a synchronous channel; and a synchronous channel setting means capable of
synchronization control means for controlling the readout means so that readout is performed in synchronization with readout of the first channel with respect to a certain second channel set to be synchronized with the channel of the first channel; Device. 2. The synchronization channel setting means includes a readable/writable synchronization channel table that stores, for each channel, the name of the channel to be synchronized with, and a table setting means for rewriting and setting the stored contents of this table. However, this synchronous channel table is read out according to the time division timing of each channel, and the synchronization control means synchronizes the reading of the channel name read out from the synchronous channel table at the time division timing of a certain channel. 2. The modulated signal generating device according to claim 1, wherein said readout means is controlled so that reading is performed. 3. The frequency setting means includes a frequency data memory that stores frequency data for each channel, and this frequency data memory is read out according to the time division timing of each channel, and the reading means is configured to store frequency data for each channel. , a calculation means for independently and repeatedly calculating for each channel, and a storage means for temporarily storing the calculation result for each channel, reading it out for the next calculation, and supplying it to the calculation means, The waveform table is read out using the calculation result from the means or the storage means as an address signal, and the synchronization control means controls the calculation result regarding the channel name read from the synchronization channel table to be read from the storage means. A modulated signal generating device according to claim 2. 4. The waveform table stores a plurality of different waveforms, and the reading means independently selects a waveform to be read from the waveform table for each channel, and reads each selected waveform signal. A modulated signal generator according to claim 1.