JPH0582951B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a musical tone generating device that has a plurality of musical tone generating channels and generates desired musical tones in each channel, and particularly relates to a musical tone generating device that has a plurality of musical tone generation channels and generates desired musical tones in each channel, and in particular, the present invention relates to a musical tone generating device that has a plurality of musical tone generation channels and generates desired musical tones in each channel. The present invention relates to a pitch-synchronized musical sound generation device which converts digital musical sound waveform data representing a musical sound waveform of each channel digitally formed into an analog musical sound waveform signal synchronized with the pitch and outputs the signal. [Prior Art] Conventionally, as shown in Japanese Unexamined Patent Application Publication No. 191696/1982, this type of device has been used to time-divisionally generate waveform sample values of musical tones assigned to each of a plurality of musical tone generation channels from a musical waveform generation circuit. a first latch circuit group that demultiplexes digital musical sound waveform data output from the digital music waveform data and latches it for each channel;
a second latch circuit group that relatches the digital tone waveform data of each channel outputted in parallel from the latch circuit group using a clock signal that is approximately an integral multiple of the frequency of the musical tone of each channel;
The time-division musical sound waveform data of each channel is converted into musical sound waveform data synchronized with the pitch of each musical tone and obtained in parallel from the second latch circuit group for each channel, and all of these musical sound waveform data are added to an adder. After summing the signals, a digital-to-analog converter (hereinafter referred to as a D/A converter) converts the signal into an analog signal, so that the aliasing noise components based on the sampling frequency of each musical sound waveform are converted into non-integer multiples of the musical sound frequency. This prevents the musical tone generated by the analog signal from becoming muddy. [Problems to be Solved by the Invention] However, in the above-mentioned conventional device, the musical sound waveform data of each channel output in parallel from the second latch circuit group in synchronization with the pitch of the musical tone is simultaneously supplied to the adder. In addition, since the adder adds up all of these data, the digital data supplied to the D/A converter indicates the sum of the musical waveform data of each channel, and the musical waveform signal of each channel is I couldn't take it out. For this reason, there are stereo effects in which the sound image localization position of musical tones generated in each channel is controlled independently for each individual or group, and special effects in which effects such as tremolo and reverb are added to and reproduced only specific musical tones. etc. could not be realized. In addition, in the conventional device described above, in order to extract musical sound waveform signals for each channel, a D/A converter is connected to each latch circuit output side of the second latch circuit group, and It may be possible to independently convert the output digital tone waveform data of each channel into an analog signal, but this method would require D/A converters for the number of channels, which would increase the cost of the tone generator. There was a problem that the price was high. The purpose of this invention is to address the above problems.
To eliminate the need to provide a D/A converter for each channel as in the above-mentioned conventional technology, and to extract analog musical tone signals synchronized with the pitch of generated musical tones for each channel by simply providing a single D/A converter. An object of the present invention is to provide a pitch-synchronized musical tone generator capable of performing the following functions. [Means for solving the problem] In order to solve the problem, the first invention has a structural feature that, as shown in FIG. A musical sound generation device for generating a desired musical sound, comprising: musical sound waveform data generating means 1 for generating musical sound waveform data consisting of digital data representing the waveform of a musical sound to be generated in each channel in a time-division manner for each channel; a time division canceling means 2 for demultiplexing the musical sound waveform data of each channel generated from the musical sound waveform data generating means 1 in a time-division manner and outputting the same in parallel for each channel; and an abbreviation of the musical sound frequency to be generated in each channel. Pulse train signal generation means 3 outputs pulse train signals having integral multiple frequencies in parallel for each channel, and musical waveform data of each channel output in parallel from the time division canceling means 2 is used to generate each of the pulse train signals regarding the channel. The present invention includes a selection gate means 4 which selectively outputs each pulse when a pulse is generated, and a digital-to-analog conversion means 5 which converts the selectively outputted tone waveform data into an analog signal and outputs the same for each selected output. Further, as shown in FIG. 1, the structural features of the second invention include, in addition to the structure of the first invention,
A sample and hold means 6 is provided for sampling and holding the analog signal outputted from the digital-to-analog conversion means 5 for each channel according to the pulse train signal for each channel. [Operations and Effects of the Invention] According to the first invention configured as described above, the time division release means 2 generates a tone waveform composed of digital data supplied from the tone waveform data generation means 1 in a time-division manner for each channel. Multiply the data,
The previously supplied data is held for each channel until new tone waveform data is supplied, and the held tone waveform data for each channel is simultaneously output in parallel to the selection gate means 4. The selection gate means 4 selects a pulse train signal based on a pulse train signal having a frequency approximately an integral multiple of the musical tone frequency generated for each channel supplied from the pulse train signal generating means 3, that is, a pulse train signal synchronized with the pitch of each musical tone. When a pulse is generated, the tone waveform data for the channel is output to the digital-to-analog conversion means 5, and the digital-to-analog conversion means 5 converts the tone waveform data into an analog signal and outputs it. As a result, the digital-to-analog conversion means 5 outputs an analog signal representing the waveform of the musical tone generated in each channel at a time division timing synchronized with the pitch of each musical tone, and this analog signal is output on the time axis. Since each channel is independent, analog signals representing each musical tone can be extracted for each channel by using a single digital-to-analog conversion means 5, and musical tones for each channel or a specific channel group can be extracted for each channel or for each specific channel group. can be played. Therefore, for example, if the above-mentioned stereo effect and special effects are added after distributing this time-division analog signal to each channel or channel group, it is possible to reproduce a rich musical sound with a three-dimensional effect. be done. According to the second invention, in addition to the first invention, the sample and hold means 6 samples and holds the analog signal output from the digital-to-analog conversion means 5 for each channel according to the pulse train signal for each channel. Therefore, a plurality of analog signals representing each musical tone of each channel are outputted in parallel from the sample and hold means 6. Therefore, it becomes possible to add the above-mentioned stereo effect and special effect to these analog signals, and the same effect as that of the above-mentioned first invention can be achieved. [Embodiment] Hereinafter, an embodiment of the musical tone generating device according to the present invention will be described with reference to the drawings. Fig. 2 is a general outline of an automatic rhythm playing device that automatically generates rhythm tones using the same device. The figure shows. This automatic rhythm performance device includes a rhythm data generating section 10 that generates rhythm data indicating the rhythm instrument to be generated and its generation timing, and a pitch data memory 2.
0, a multiplexing circuit 30, a phase data generator 40, a waveform memory 50, a pitch synchronization circuit 60, a D/A converter 70, a channel distribution circuit 80, and a sound system 90.The rhythm instrument is controlled by rhythm data. It includes a musical tone generating section that generates a sound, and a timing signal generator 100 that controls the time-sharing operation timing of the rhythm data generating section 10 and the musical tone generating section. The timing signal generator 100 is composed of a counter, a decoder, etc., and generates a channel number signal CH and channel timing pulse signals CH1 to CH8 in synchronization with a channel clock signal φ (for example, about 50 KHz) supplied from a clock generator 101. is output repeatedly in sequence. This channel number signal CH is the third
As shown in the figure, the digital value is a coded multi-bit signal that sequentially indicates the numbers of musical tone generation channels 1 to 8, and the channel timing pulse signals CH1 to CH8 correspond to the numbers of musical tone generation channels 1 to 8. These are sequential pulse signals each indicating a timing. In addition, the clock generator 10
1 outputs a pitch synchronization clock signal φ ₀ (approximately 400 KHz) together with the channel clock signal φ. The channel clock signal φ may be a frequency-divided output of the pitch synchronization clock signal φ ₀ or may be an oscillation output independent of the pitch synchronization clock signal φ ₀ . The rhythm data generation section 10 includes a plurality of rhythm selection switches each corresponding to a rhythm type such as swing or march, and includes a rhythm selection circuit 11 that generates a rhythm selection signal RSS representing the rhythm type by selecting the switch. Rhythm selection circuit 1
1, a rhythm sound channel allocation memory 12 and a rhythm pattern generator 13 are respectively connected to the rhythm sound channel allocation memory 12 and the rhythm pattern generator 13. The rhythm sound channel allocation memory 12 is
As shown in Table 1 below, it is composed of a memory circuit that stores rhythm instrument data RTND representing each rhythm instrument name assigned to each channel according to the rhythm type, and this memory circuit stores the rhythm selection signal RSS and the channel. Addressed by the number signal CH, the rhythm instrument data RTND is output at each time-division channel timing.

[Table] In the allocation of rhythm tones in Table 1 above, the channels with lower numbers are assigned to percussion instruments with a stronger pitch, that is, resonance-type percussion instruments, and as the number increases, channels with a weaker pitch, or resonance instruments, are assigned. A noise-type percussion instrument is assigned. The rhythm pattern generator 13 is connected to a rhythm pattern memory that stores rhythm pattern data RPD representing the generation timing of rhythm sounds for each channel according to the rhythm type, and a tempo oscillator that generates a tempo clock signal to count the tempo clock. It includes a tempo counter and a multiplexer connected to the output of the rhythm pattern memory, and the rhythm pattern memory receives the rhythm selection signal.
It outputs rhythm pattern data RPD addressed by the RSS and the output of the tempo counter, and this rhythm pattern data RPD is time-division multiplexed by a multiplexer controlled by the channel number signal CH and output as a rhythm pattern pulse signal RP. In addition, the rhythm pattern generator 13
A rhythm start control switch 14 for controlling the start of automatic rhythm performance is connected to , and the rhythm start control switch 14 has a high level of "1" in its closed state and a low level of "0" in its open state. A rhythm start signal ST is generated, and the high level of this start signal ST is “1”.
allows the rhythm pattern generator 13 to generate the rhythm pattern pulse signal RP, and
It controls the phase data generator 40. The pitch data memory 20 is comprised of a memory circuit that stores the pitch data PD of all rhythm instruments that can be sounded by the automatic rhythm performance device according to Table 1, and is addressed by the rhythm selection signal RSS. Pitch data PD1 to PD8 corresponding to each rhythm instrument assigned to each channel for the indicated rhythm type are output in parallel for each channel. In addition, Pituchi Data PD is
In this embodiment, the pitch synchronization clock signal φ ₀
This data represents a frequency division ratio for forming a note lock signal having a frequency that is approximately an integer multiple of the frequency of each rhythm instrument sound. The pitch data PD1 to PD8 are supplied to clock generators 21-1 to 21-8 provided for each channel, respectively. Clock generator 21-1 to 21-8
The pitch synchronization clock signal φ ₀ is frequency-divided based on the frequency division ratio represented by the pitch data PD1 to PD8, and the note clock signals NC1 to NC1 are approximately integer multiples of the frequency of the rhythm instrument sound for each channel. Output each NC8. As shown in FIG. 4, the multiplexing circuit 30 includes flip-flop circuits 31-1 to 31-3 which input note clock signals NC1 to NC8 to set terminals S, respectively.
1-8 and these flip-flop circuits 31-
Each output Q of 1 to 31-8 is supplied to one input thereof, and the channel timing pulse signal CH1 to CH for each channel is supplied to the other input.
AND gates 32-1 to 32 each supplied with 8
-8 and these AND gates 32-1 to 32-
These AND gates 32-1 to 32
-8 outputs are flip-flop circuits 31-1 to 31-1.
It is also supplied to each reset terminal R of 31-8. And the note clock signal NC1~NC
8 is input to each set terminal S of the flip-flop circuits 31-1 to 31-8, the circuit 31
The outputs Q of -1 to 31-8 are high level "1", and the AND gates 32-1 to 32-8 each output a high level "1" signal at the channel timing based on the channel timing pulse signals CH1 to CH8. is outputted as the note clock signal NC via the OR gate 33, so this note clock signal NC is outputted as the note clock signal NC1.
-NC8 are time-division multiplexed for each channel. Also, this AND gate 32-1 to 3
The high level "1" signal from the flip-flop circuits 31-1 to 31-8 is also supplied to each reset terminal R of the flip-flop circuits 31-1 to 31-8.
-1 to 31-8 are reset, and at this point, each output Q of the flip-flop circuits 31-1 to 31-8 becomes low level "0", so the note clock signal NC is set to the low level "0" of each note clock signal NC1 to NC8. This is a signal that becomes high level "1" only once at the channel timing when changing from "0" to high level "1". Furthermore, each output Q of the flip-flop circuits 31-1 to 31-8
are also output to pitch synchronization circuit 60 as pitch synchronization pulse signals PSP1 to PSP8, respectively. And these pitch synchronization pulse signals PSP1 to PSP
8 rises in synchronization with each note clock signal NC1 to NC8 and falls in accordance with each channel timing pulse signal CH1 to CH8, and the pitch synchronization circuit 60, as described later,
Since only the rising timing of these signals PSP1 to PSP8 is used, these signals PSP1 to
PSP8 is used as a signal whose frequency is approximately an integral multiple of the frequency of the rhythm instrument sound assigned to each channel, and is unrelated to channel timing. Therefore, instead of each output Q of the flip-flop circuits 31-1 to 31-8,
The pitch synchronization circuit 60 may output the note clock signals NC1 to NC8 as the pitch synchronization pulse signals PSP1 to PSP8. The phase data generator 40 inputs the note clock signal NC from the multiplexing circuit 30 and time-divisionally generates an absolute address signal MADR for each channel, which controls the reading of the waveform data of the rhythm instrument sound stored in the waveform memory 50. The output is
Before explaining the details of this phase data generator 40, for convenience of explanation, the waveform data stored in the waveform memory 50 will be described. As shown in FIG. 5, the waveform memory 50 includes a plurality of areas 50-a and 50 for storing waveform data for each rhythm instrument sound such as cymbal 1, cymbal 2, snare drum 1, and so on.
-b, 50-c, . . . , and each waveform data consists of a plurality of sampling data obtained by sampling the instantaneous values of musical waveforms from the start of sound generation to the end of sound generation of each rhythm instrument sound. Furthermore, in order to prevent the sampling value from becoming a small value and the quantization error from increasing when the amplitude level of the musical tone becomes small, this sampling data is set from the start of sound generation regardless of the amplitude envelope that attenuates after the start of sound generation. The sampled values of the waveform converted into a musical sound waveform with a constant amplitude level until the end are shown. Further, the above-mentioned absolute address signal MADR directly indicates each address of the waveform memory 50, and the relative address signal ADR, which will be described later, indicates each area 50-a,
50-b, 50-c, . . . each indicates the number of the address counting from the starting address (star address) SADR-a, SADR-b, SADR-c, . Next, the phase data generator 40 will be explained in detail using FIG. 4. The generator 40 includes a shift register 41 that circularly stores the relative address signal ADR for each channel, and a shift register 41 that cyclically stores the relative address signal ADR for each channel, and updates the relative address signal ADR. and an adder 43 that converts the relative address signal ADR into an absolute address signal MADR. The shift register 41 has eight stages of registers equal to the number of musical tone generation channels, and receives a channel clock signal φ.
The relative address signal ADR stored in the previous stage is sequentially transferred to the subsequent stage under the control of . The adder 42 inputs the note clock signal NC to the other input via the gate circuit 44, and in response to the arrival of the note clock signal NC of high level "1" for each time division channel, the relative address signal ADR of the corresponding channel is input. ``1''
Add. The added relative address signal ADR is then supplied to the first stage register of the shift register 41 via the gate circuit 45.
The gate circuit 45 has a high level “1” to make the gate circuit 45 conductive and a low level “0”.
An AND gate 45a is connected to output a control signal to make the circuit 45 non-conductive. This AND gate 45a inputs the rhythm start signal ST to one input terminal, and inputs the rhythm pattern pulse signal RP to the other input terminal via the inverter 45b.
A high level "1" control signal is output to the gate circuit 45 only when the rhythm pattern pulse signal RP is at a high level "1" and the rhythm pattern pulse signal RP is at a low level "0". As a result, when the rhythm start control switch 14 is opened and the automatic rhythm performance is stopped, the gate circuit 45 is rendered non-conductive, and the first stage of the shift register 41 is set to "0" at all time-division channel timings. The relative address signal ADR of all channels of the shift register 41 is set to "0".
Furthermore, when the rhythm start control switch 14 is closed to enter the automatic rhythm performance state, the gate circuit 4
5 is a signal that is controlled to be non-conductive only at the time division channel timing when the rhythm pattern pulse signal RP of high level "1" arrives, and shows "0" to the first stage of the shift register 41 only at the channel timing. output,
At other timings, it is controlled to be conductive,
An adder 42 is installed in the first stage of the shift register 41.
Outputs a relative address signal ADR for each channel supplied from. Therefore, in this state,
The relative address signal ADR of each channel becomes "0" when the rhythm instrument assigned to the channel starts sounding, and then sequentially changes to "1" each time a high-level "1" note clock signal NC occurs at the timing of the channel. It will show an increased value. On the other hand, a comparator 46 is connected to the gate circuit 44 that controls passage of the note clock signal NC, and the comparator 46 inputs the relative address signal ADR from the shift register 41 to one input terminal, and The end address signal from the end address memory 47 is input to the other input terminal, and when the values indicated by both signals match, a low level "0" control signal is output to make the gate circuit 44 non-conductive. In other cases, a control signal of high level "1" is output to bring the circuit 44 into a conductive state. The end address memory 47 also includes the waveform memory 5.
This is to store each final relative address value of each area 50-a, 50-b, 50-c, etc. of 0, and is controlled by rhythm instrument data RTND supplied at each time-division channel timing, and is stored in each channel. The read final relative address value of the musical sound waveform of the assigned rhythm instrument is output as an end address signal. As a result, shift register 4
1 and the relative address signal ADR for each channel updated by the adder 42 reaches the final read address value of the musical sound waveform of the rhythm instrument assigned to the channel, the gate circuit 44 is controlled to be non-conductive. Then, the supply of the note clock signal NC of the channel to the adder 42 is stopped, and the relative address signal of the channel is stopped.
ADR updates stop. The output end of the shift register 41 is also connected to one input end of the adder 43;
The other input terminal of the start address memory 48
is connected. Start address memory 48
are each area 50-a, 50- of the waveform memory 50
Each start address SADR- of b, 50-c...
a, SADR-b, SADR-c, etc., each start address SADR of the musical waveform of the rhythm instrument sound assigned to each channel is controlled by the rhythm instrument data RTND supplied at each channel timing. -a, SADR-b,
Outputs a start address signal indicating SADR-c... As a result, the adder 43 adds the start address signal supplied from the start address memory 48 at each channel timing and the relative address signal ADR supplied from the shift register at each channel timing, and assigns the result to each channel. Absolute address signal indicating the absolute address of the musical sound waveform of the rhythm instrument sound
Output MADR to waveform memory 50. The waveform memory 50 receives the above absolute address signal.
Based on MADR, sampling data of musical waveforms of rhythmic instrument sounds assigned to each channel is time-divisionally output to multiplier 51 as musical waveform data WD in synchronization with each channel timing. The multiplier 51 multiplies this time-division musical sound waveform data WD by the envelope waveform data of each channel supplied from the envelope generator 52 at each channel timing, thereby generating a musical sound waveform with an envelope added for each channel. data
EWD is time-divisionally output in synchronization with each channel timing. The envelope circuit 52 includes an 8-stage shift register that cyclically stores the instantaneous envelope waveform value of the rhythm instrument sound assigned to each channel under the control of the channel clock signal φ, and an operation that performs time-division calculations on the instantaneous envelope value. A high-level "1" rhythm pattern pulse is supplied at the timing of each channel. In response to the arrival of the signal RP, the envelope data of each channel is time-divisionally output in synchronization with the timing of each channel. Note that when the waveform memory 50 stores waveform sample values representing a musical sound waveform to which an envelope has been added as musical sound waveform data, these multipliers 5
1 and envelope generator 52 are no longer required. As shown in detail in FIG. 6, the pitch synchronization circuit 60 includes a plurality of latch circuits 61-1 to 61 connected to the multiplier 51 and forming a de-arch circuit for demultiplexing the time-division musical waveform data EWD.
The selector 62 for converting these demographic output to the rhythm instrument sound pituchi that is assigned to each chinnel, and the Pitchi Synchronization signal of each Chiyannel is predetermined. A priority circuit 63 for output is provided. The latch circuits 61-1 to 61-8 are controlled by channel timing pulse signals CH1 to CP8, respectively, and are supplied with time-division musical waveform data from the multiplier 51 in synchronization with each channel timing.
EWD is stored separately for each channel. The selector 62 outputs musical waveform data of each channel in parallel from each latch circuit 61-1 to 61-8.
Pitch synchronization pulse signal PSP1 of each channel is inputted in parallel with EWD and is supplied from the priority circuit 63 via AND gate groups 64-1 to 64-8.
Pitch synchronization pulse signal PSP1*~PSP8* which is controlled by *~PSP8* and becomes high level "1"
The music waveform data EWD of the channel to which it belongs,
Selectively output as pitch-synchronized musical waveform data EWD*. The priority circuit 63 includes flip-flop circuits 65-1 to 65- corresponding to each channel.
8 output signals Q are input, and when the signals are input at the same time, signals of channels with smaller numbers are output with priority. These flip-flop circuits 65-1 to 65-8 each enter the set state (Q=“1”) in synchronization with the rise of pitch synchronization pulse signals PSP1 to PSP8 inputted to each set terminal S, respectively.
In synchronization with the fall of the pitch synchronization pulse signals PSP1* to PSP8* from the AND gates 64-1 to 64-8, which are set to ) is set. Further, each output signal of the priority circuit 63 is outputted from AND gates 64-1 to 64-1 corresponding to each channel.
64-8, and a pitch synchronization clock signal φ ₀ is supplied to the other inputs of these AND gates 64-1 to 64-8. Therefore, the pitch synchronization pulse signal PSP1
~ Any one of PSP8, e.g. PSPn (however, n
is an integer greater than or equal to 1 and less than or equal to 8) rises from low level “0” to high level “1”, this signal PSPn
The output signal Q of the flip-flop circuit 65-n corresponding to the channel n to which the flip-flop belongs is high level "1".
This high level "1" signal is passed through the priority circuit 63 to the AND gate 64 corresponding to the channel n in the AND gates 64-1 to 64-8.
-n, and this AND gate 64-n generates a pitch synchronization pulse signal PSPn, which is a pulse signal equal to the pulse width of the pitch synchronization clock signal _φ0 .
* is generated. In addition, this pitch synchronization pulse signal
Since the flip-flop circuit 65-n is reset in synchronization with the fall of PSPn*, the pitch synchronization pulse signal PSPn* will not be generated twice on the same channel. On the other hand, any two or more of the pitch synchronization pulse signals PSP1 to PSP8, e.g.
If PSPm and PSPn (where m and n are integers from 1 to 8, and m<n) rise from low level "0" to high level "1" at the same time, the priority circuit 63 gives priority to the output signal of the flip-flop circuit 65-m of the channel m with the smaller number, so the flip-flop circuit 65-m
After pitch synchronization clock signals φ0 and 65-n are set simultaneously, pitch synchronization pulse signals PSPm*, PSPm*, and PSPm* of the next high level "1" are set in accordance with pitch synchronization clock signal _φ0 .
PSPn* are output sequentially. As a result, the tone waveform data EWD* of the channels with small numbers,
Accurately synchronize with the pitch of the musical tone of the channel. The D/A converter 70 is connected to the selector 62, and this D/A converter 70 receives musical sound waveform data.
EWD* is converted into an analog signal, and this analog signal is time-divisionally output in synchronization with the pitch of the musical tone assigned to each channel. The details of the channel allocation circuit 80 are explained in the sixth section.
As shown in the figure, the
FET gates 81-1 to 81-8 and these
Buffer amplifiers 82-1 to 82-8 connected to each output of FET gates 81-1 to 81-8, respectively
and capacitors 83-1 to 83-8, one end of which is connected to each connection point of FET gates 81-1 to 81-8 and buffer amplifiers 82-1 to 82-8, and the other end of which is grounded. of
FET gates 81-1 to 81-8, buffer amplifiers 82-1 to 82-8, and capacitors 83-1 to
Each circuit 83-8 forms a sample hold circuit corresponding to each channel. FET
Each input terminal of the gates 81-1 to 81-8 is commonly connected to the output terminal of the D/A converter 70, and each control terminal of the FET gates 81-1 to 81-8 is connected to the pitch synchronization circuit 60. And Gate 64-1~
64-8. and,
The FET gates 81-1 to 81-8 are conduction-controlled based on each high-level "1" signal of the pitch synchronization pulse signals PSP1* to PSP8*, and are connected to the rhythm instrument assigned to each channel by the D/A converter 70. Time-division analog signals supplied in synchronization with the pitch of the sound are stored in capacitors 83-1 to 83-8, respectively. As a result, the analog signal representing the musical sound waveform of each channel is transmitted to the buffer amplifier 82-1~
Each channel is output from 82-8. The sound system 90 includes a plurality of mixing circuits that mix analog musical sound waveform signals output from each channel from the channel distribution circuit 80 in an appropriate ratio, and is connected to each of the plurality of mixing circuits to amplify the output of each mixing circuit. The system is equipped with multiple power amplifiers, and multiple speakers connected to each power amplifier and placed at spatially distant positions, and each channel has a different musical tone (rhythm instrument sound) assigned to it. Sound is produced by localizing the sound image to a spatial position. It is also possible to provide effect circuits such as reverb and tremolo in the sound system 90 and emit musical tones with the above-mentioned effects applied to each channel. To summarize the operation of the automatic rhythm playing device configured as described above, after a desired rhythm type is selected by the rhythm selection switch in the rhythm selection circuit 11, when the rhythm control switch 14 is closed, The rhythm data generating section 10 generates a rhythm start signal ST of high level "1", and also generates a rhythm selection signal RSS, rhythm instrument data RTND, and a rhythm pattern pulse signal RP according to the selected rhythm type. This rhythm selection signal RSS is output to the pitch data memory 20, and the pitch data memory 20
Pitch data PD1 to PD8 according to the rhythm instrument sounds assigned to each channel as shown in Table 1 above
are outputted to clock generators 21-1 to 21-8, respectively, and the clock generators 21-1 to 21-8 generate note clock signals that are substantially integral multiples of the musical tone frequency of the rhythm instrument tone based on pitch data PD1 to PD8. NC1 to NC8 are output for each channel. These note clock signals NC1 to NC8 for each channel are converted by a multiplexing circuit 30 into a time-division note clock signal NC synchronized with the channel timing and supplied to a phase data generator 40. The phase data generator 40 is controlled by the time-division note clock signal NC to time-divisionally form an address signal MADR (phase data) for each channel, which changes at a speed proportional to the musical tone frequency and represents the phase of the musical sound waveform. and this address signal
MADR is time-divisionally output to the waveform memory 50 in synchronization with channel timing. As a result, sampling data of musical waveforms of rhythm instrument sounds to be generated in each channel are read out from the waveform memory 50 in time division in synchronization with the channel timing as musical waveform data WD. On the other hand, the envelope generator 52 forms and outputs envelope waveform data of the rhythm instrument sound assigned to each channel in synchronization with the channel timing based on the rhythm instrument data RTND and the rhythm pattern pulse signal RP. This envelope waveform data and the musical sound waveform data WD are multiplied by a multiplier 51, and the musical sound waveform data EWD to which the envelope has been added is output from the multiplier 51 to the pitch synchronization circuit 60 in synchronization with the channel timing. . The tone waveform data EWD of each channel supplied to the pitch synchronization circuit 60 in a time-division manner is latched by the latch circuits 61-1 to 61-8 for each channel, and the tone waveform data EWD latched for each channel is processed by the selector 62. Each musical sound waveform data is selected at the timing of pitch synchronization.
Output as EWD*. That is, the selector 62 selects the pitch synchronization pulse signals PSP1*~ supplied from the multiplexing circuit 30 via the priority circuit 63.
Based on PSP8*, latch circuits 61-1 to 61
Since the musical sound waveform data EWD of each channel supplied from -8 is selectively outputted, the musical sound waveform data EWD * output from this selector 62 is time-division multiplexed in synchronization with the pitch of the rhythm instrument sound assigned to each channel. It becomes a signal. And this musical waveform data EWD* is D/A
After being converted into an analog signal by the converter 70, it is separated into musical tone signals consisting of analog signals for each channel by a channel distribution circuit 80 controlled by the pitch synchronization pulse signals PSP1* to PSP8*, and then sent to the sound system. Pronounced from 90 onwards. As described above, according to the above embodiment, the tone waveform data of each channel is supplied to the pitch synchronization circuit 60 in a time-division manner in synchronization with the channel timing.
The EWD is converted by the latch circuits 61-1 to 61-8 and the selector 62 in the pitch synchronization circuit 60 into musical sound waveform data EWD* that changes in synchronization with the pitch of the generated musical tone for each channel. The musical sound waveform data EWD* is converted into an analog signal by a D/A converter 70. As a result, the D/A converter 70 obtains a time-division analog musical tone signal that can be distributed by channel and is synchronized with the pitch of the generated musical tone. This time-division analog musical tone signal is a pitch synchronization pulse signal.
A channel-by-channel distribution circuit 80 controlled by PSP1* to PSP8* extracts analog musical tone signals for each spatially separated channel, making it possible to reproduce musical tones for each channel. Furthermore, in the pitch synchronization circuit 60,
The priority circuit 63 simultaneously outputs a high level “1” pitch synchronization pulse signal PSP in multiple channels.
Pitch synchronization pulse signal PSP1*~ that prevents the occurrence of PSP8* and precisely synchronizes with the pitch of the pitch of a rhythm instrument with a strong sense of pitch.
Since PSP8* is output, the musical sound waveform data of each channel is no longer input to the D/A converter 70 at the same time, and the degree of separation of the musical sound signals extracted for each channel is improved. Furthermore, it is possible to minimize the muddiness of musical tones caused by channel timing unrelated to musical pitch. In addition, in the above embodiment, the pitch synchronization signal
Since it is rare for a plurality of signals in PSP1 to PSP8 to become high level "1" at the same time, it is also possible to omit the priority circuit 63 in the pitch synchronization circuit 60. In this case, the latch circuits 61-1 to 61-8 and selector 62 of the pitch synchronization circuit 60 of the above embodiment may be replaced with a circuit as shown in FIG. This circuit includes the latch circuits 61-1 to 61-6.
Pitch synchronization pulse signal PSP to each output from 1 to 8.
Gate circuit 62-1 controlled by 1* to PSP8*
~62-8 are connected, and these gate circuits 62-
It consists of an adder 66 that adds each tone waveform data from 1 to 62-8. With this configuration, multiple signals among the pitch synchronization signals SPS1 to PSP8 become high level "1" at the same time, and since the priority circuit 63 is omitted, the pitch synchronization pulse signal
Even if multiple signals in PSP1* to PSP8* become high level "1" at the same time, the gate circuit 62-
1 to 62-8 are equal circuits in which the tone waveform data of the channels to which the plurality of signals belong are simultaneously output, and the adder 66 adds and outputs the tone waveform data, so that the tone waveform data of the channels are deleted. It won't malfunction. In addition,
In this case, the output data of the adder 66 is obtained by momentarily synthesizing the musical waveform data of multiple channels only at the timing when multiple signals among the pitch synchronization pulse signals PSP1* to PSP8* become high level "1" at the same time. This data shows the capacitors 83-1 to 83-8 in the channel distribution circuit 80 and the sound system 9.
is removed by a low-pass filter action within 0,
It has almost no effect on the generation of musical tones for each channel. In this case, as mentioned above, instead of the pitch synchronization pulse signals PSP1* to PSP8*,
Note clock signals NC1 to NC8 may be supplied to gate circuits 62-1 to 62-8. Further, in the above embodiment, the musical sound waveform signal is distributed to each channel in the channel distribution circuit 80, but the sound system 90
Once the number of musical tone pronunciation sequences in is determined, it is also possible to distribute the tones into numbers corresponding to the number of sequences. For example, when a pair of left and right speakers is provided in the sound system 90, two sample and hold circuits are provided in the channel distribution circuit 80, and the sample and hold circuits are used to transmit the pitch synchronization pulse signals PSP1* to PSP8* to the two sample and hold circuits. It is preferable to group them into sets and control by outputting a logical sum of a plurality of signals. In addition, in the above embodiment, an all-memory method was adopted as the musical waveform generation method, which stores all waveform data from the start of sound generation to the end of sound generation. A waveform memory method may be adopted in which a plurality of partially continuous or discrete periodic waveforms are read out. Furthermore, instead of the waveform memory method, a tone generation method such as an FM synthesis method or a harmonic synthesis method may be used.
Furthermore, in the above embodiment, digital data (PCM data) indicating the instantaneous value of the musical sound waveform is used as the digital data representing the musical sound waveform, but this digital data includes the waveform instantaneous value at the previous sample point. Difference data representing the difference between the waveform instantaneous value and the waveform instantaneous value at the next sample point may be employed. In this case, an accumulator may be interposed which accumulates the digitally or analogously supplied differential signals during the transfer of the musical tone signal to the sound system 90. Further, in the above embodiment, the musical tone generating device according to the present invention is applied to an automatic rhythm playing device, but this musical tone generating device can also be applied to an electronic musical instrument that generates performance sounds from a keyboard or the like. It is something. In this case, a key pressed on the keyboard is assigned to one of the channels by the key assigner circuit, and based on this assignment, the pitch data memory generates pitch data regarding the pitch of the assigned key. Instead of the rhythm pattern signal RP, the envelope generator may be controlled by a key-on signal based on key presses.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention in accordance with the claims, and FIG. 2 is a circuit block diagram showing an example of an automatic rhythm playing device in which the invention is applied to an automatic rhythm playing device. 3 is a time chart showing the timing signal generated from the timing signal generator of FIG.
The figure is a circuit diagram showing a detailed example of the multiplexing circuit and phase data generator shown in FIG. 2, FIG. 5 is a diagram showing an example of the memory map of the waveform memory shown in FIG.
FIG. 7 is a circuit diagram showing a detailed example of the pitch synchronization circuit and the channel-by-channel distribution circuit shown in the figure, and FIG. 7 is a diagram showing a modification of the pitch synchronization circuit shown in FIG. 2. Explanation of symbols, 10... Rhythm data generation section, 2
0... Pitch data memory, 21-1 to 21-8
... Clock generator, 30 ... Multiplexing circuit, 40
... Phase data generator, 50 ... Waveform memory, 6
0... Pitch synchronization circuit, 61-1 to 61-8...
...Latch circuit, 62...Selector, 62-1 to 6
2-8...Gate circuit, 63...Priority circuit, 64
-1~64-8...and gate, 65-1~6
5-8...Flip-flop circuit, 66...Adder, 70...D/A converter, 80...Channel distribution circuit, 90...Sound system, 10
0...Timing signal generator.

Claims (1)

[Scope of Claims] 1. A musical sound generation device having a plurality of musical sound generation channels, each of which generates a desired musical sound, comprising: a musical sound composed of digital data representing a waveform of a musical sound to be generated in each channel; a musical waveform data generating means for generating waveform data for each channel in a time-divisional manner; and a musical waveform data generating means for demultiplexing the musical waveform data of each channel generated in a time-divisional manner from the musical waveform data generating means and outputting the same in parallel for each channel. time division cancellation means; pulse train signal generation means for outputting pulse train signals in parallel for each channel having a frequency that is approximately an integer multiple of the musical tone frequency to be generated in each channel; a selection gate means for selectively outputting the tone waveform data of each channel at the time of each pulse generation of the pulse train signal related to the channel; and converting the selectively outputted tone waveform data into an analog signal for each selected output and outputting the same. 1. A pitch-synchronized musical tone generator characterized by comprising digital-to-analog conversion means. 2. In a musical tone generating device that has a plurality of musical tone generation channels and generates a desired musical tone in each channel, musical sound waveform data consisting of digital data representing the waveform of the musical tone to be generated in each channel is generated for each channel. a musical sound waveform data generating means that generates the musical sound waveform data in a time-divisional manner, and a time-division canceling means that demultiplexes the musical sound waveform data of each channel generated in a time-divisional manner from the musical sound waveform data generating means and outputs the musical sound waveform data in parallel for each channel; pulse train signal generation means for outputting pulse train signals in parallel for each channel having a frequency that is approximately an integer multiple of the musical tone frequency to be generated in each channel; and musical waveforms for each channel output in parallel from the time division canceling means. a selection gate means for selectively outputting data when each pulse of the pulse train signal regarding the channel is generated; a digital-to-analog conversion means for converting the selectively output musical waveform data into an analog signal and outputting the same for each selected output; A pitch-synchronized musical tone generator comprising sample-hold means for sample-holding the analog signal output from the digital-to-analog conversion means for each channel according to the pulse train signal for each channel.