JPS6262396A - Pitch synchronous type musical sound generator - 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 Industrial 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 is independent of the pitch of the musical tone. Digital tone waveform data representing the tone waveform of each channel digitally formed according to the channel time division timing of
The present invention relates to a pitch-synchronized musical tone generating device that converts into an analog musical sound waveform signal synchronized with the pitch and outputs the signal.

[Prior art]

Conventionally, as shown in Japanese Patent Application Laid-Open No. 57-191696, this type of device displays waveform sample values of musical tones assigned to each of a plurality of musical tone generation channels and outputs them in a time-divisional manner from a musical sound waveform generation circuit. A first latch circuit group that demultiplexes digital musical sound waveform data and latches it for each channel; and a first latch circuit group that demultiplexes the digital musical sound waveform data of each channel and latches it for each channel; and a second latch circuit group that re-latches each using a clock signal having an integer multiple relationship, and converts the time-division musical waveform data of each channel into musical sound waveform data synchronized with the pinch of the musical tone. , each channel is obtained in parallel, all of these musical sound waveform data are added up using an adder, and then converted into an analog signal using a digital-to-analog converter (hereinafter referred to as a D/A converter). The aliasing noise component based on the sampling frequency of each musical sound waveform is prevented from being a non-integer multiple of the musical tone frequency, so that the musical tone generated by the analog signal is not muddy.

[Problem that the invention seeks to solve]

However, in the conventional device described above, the musical waveform data of each channel output in parallel from the second latch circuit group in synchronization with the pinch of musical tones is simultaneously supplied to the adder, and the adder sums up all of these data. D
The digital data supplied to the /A converter represents the sum of the musical waveform data of each channel,
It was not possible to extract musical waveform signals separately for each channel. Therefore, 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 a D/A converter is connected in parallel from the second latch circuit group. It may be possible to independently convert the output digital musical waveform data of each channel into an analog signal, but this method would require as many D/A converters as the number of channels, which would require seven There was a problem that the strike rate was high.

An object of the present invention is to solve the above problem by eliminating the need to provide a D/A converter for each channel as in the prior art, and by simply providing a single D/A converter, the generated musical tones can be improved. An object of the present invention is to provide a pitch-synchronized musical tone generator capable of extracting pitch-synchronized analog musical tone signals for each channel.

[Means for solving problems]

In order to solve this problem, the structural feature of the first invention is that, as shown in FIG. , a 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; time-division canceling means 2 for demultiplexing the generated tone waveform data of each channel and outputting the same in parallel for each channel; Pulse train signal generating means 3 that outputs parallel output for each channel; and selection gate means that selectively outputs musical waveform data of each channel that is output in parallel from the time division canceling means 2 when each pulse of the pulse train signal regarding the channel is generated. 4, and digital-to-analog converting means 5 for converting the selectively outputted tone waveform data into an analog signal and outputting the same for each selected output.

Further, as shown in FIG. 1, a feature of the configuration of the second invention is that, in addition to the configuration of the first invention, the analog signal output from the digital-to-analog conversion means 5 is converted to each channel. The sample and hold means 6 sample and hold each channel according to the pulse train signal.

[Function and effect of the invention]

According to the first invention configured as described above, the time-division canceling means 2 demultiplexes musical waveform data consisting of digital data supplied from the musical waveform data generating means 1 in a time-division manner for each channel, 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 the pulse train signal based on the pulse train signal synchronized with the pitch of each musical tone, that is, the pulse train signal having a substantially integer signal frequency of the musical tone frequency generated for each channel from the pulse train signal generating means 3. When a pulse is generated, the musical tone waveform data regarding the channel is output to the digital-to-analog conversion means 5, and the digital-to-analog conversion means 5 converts the musical 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-sharing timing synchronized with the pitch of each musical tone, and this analog signal is independent for each channel on the time axis. Therefore, by using only the single digital-to-analog conversion means 5, analog signals representing each musical tone are extracted for each channel, and musical tones can be reproduced for each channel or for each specific channel group. Therefore, for example, if this time-division analog signal is distributed and processed for each channel or channel group, and then the stereo effect and special effects described above are added, it is possible to reproduce a rich musical sound with a three-dimensional effect. is realized.

Further, according to the second invention, in addition to the first invention,
Since 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 of each channel, a plurality of analog signals each representing a musical tone for each channel are sent in parallel from the sample and hold means 6. It will be output.

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.

〔Example〕

Hereinafter, one embodiment of the musical tone generating device according to the present invention will be described with reference to the drawings. FIG. 2 shows an overall schematic diagram of an automatic rhythm playing device that automatically generates rhythm tones using the same device. There is. This automatic rhythm performance device includes a rhythm data generator 10 that generates rhythm data indicating the rhythm instrument to be generated and its generation timing, a pinch data memory 20, a multiplexing circuit 30, a phase data generator 40, a waveform memory 50, Pinch synchronization circuit 60. D/A converter 70
1 channel separate distribution is circuit 80 and sound system 9
0 and generates rhythm instrument sounds under the control of rhythm data, and these rhythm data generators 10
and a timing signal generator 100 that controls the time-division operation timing of the musical tone generator. 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 CHI 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. As shown in FIG. 3, this channel number signal CH is a coded multi-bit signal that sequentially indicates the numbers of musical tone generation channels 1 to 8 in its digital value, and the channel timing pulse signals CHI to CH8 are This is a sequential pulse signal indicating the timing of each of musical tone generation channels 1 to 8. Further, the clock generator 101 outputs a pitch synchronization clock signal φ0 (approximately 400 KHz) together with the channel clock signal φ. Note that the channel clock signal φ may be a frequency-divided output of the pitch synchronization clock signal φ0, or may be an oscillation output independent of the clock signal φ0.

The rhythm data generating section 10 includes a plurality of rhythm selection switches each corresponding to a rhythm type such as swing or march, and a rhythm selection circuit 11 that generates a rhythm selection signal R3S representing the rhythm type by selecting the switch.
A rhythm sound channel assignment memory 12 and a rhythm pattern generator 13 are connected to the rhythm selection circuit 11.
It is equipped with The rhythm sound channel assignment memory 12 is constituted by a memory circuit that stores rhythm instrument data RTND representing each rhythm instrument name assigned to each channel according to the rhythm type, as shown in Table 1 below.
This memory circuit is addressed by the rhythm selection signal R3S and the channel number signal CH, and outputs the rhythm instrument data RTND at each time-division channel timing.

In the allocation of rhythm musical tones in Table 1 above, the channels with smaller numbers are assigned percussion instruments with a stronger sense of pitch, that is, resonance-type percussion instruments, and as the number increases, the percussion instruments with a weaker sense of pitch, that is, noise-type percussion instruments, are assigned. 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. A tempo counter that counts,
a multiplexer connected to the output of the rhythm pattern memory, and the rhythm pattern memory receives the rhythm selection signal R.
3S and the output of the tempo counter to output rhythm pattern data RPD, which is time-division multiplexed by a multiplexer controlled by the channel number signal CH and output as a rhythm pattern pulse signal RP. Further, a rhythm start control switch 14 for controlling the start of automatic rhythm performance is connected to the rhythm pattern generator 13, and the rhythm start control switch 14 has a high level "1" when it is closed, and when it is opened. Low level “0” in state
”, and the high level “1” of this start signal ST allows the rhythm pattern generator 13 to generate the rhythm pattern pulse signal RP, and also 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 produced by the automatic rhythm performance device according to Table 1, and is addressed by the rhythm selection signal R3S and has the pitch data PD indicated by the rhythm selection signal R3S. Regarding the rhythm type, pitch data PDI to PD8 corresponding to each rhythm instrument assigned to each channel are output in parallel for each channel. In addition, pitch data P
In this embodiment, D is the pitch synchronization clock signal φ0
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. Then, the pitch data PDI~P
D8 is a clock generator 21 provided for each channel.
-1 to 21-8, respectively. Clock generator 21
-1 to 21-8 are frequency-divided based on the frequency division ratio represented by the pitch data PDI to PD8, and have a substantially integer multiple relationship with the frequency of the rhythm instrument sound for each channel. Note clock signal in NCI
~NC8 are output respectively.

As shown in FIG. 4, the multiplexing circuit 30 includes flip-flop circuits 31-1 to 31-8 that input note clock signals NCI to NC8 to set terminals S, respectively, and these flip-flop circuits 31-1 to 31. -8 outputs Q are each supplied to one of their inputs, and the channel timing pulse signal CHI for each channel is supplied to the other input.
~CH8 is supplied to AND gates 32-1 to 32, respectively.
-8 and an OR gate 33 that inputs all the outputs of these AND gates 32-1 to 32-8, and each output of these AND gates 32-1 to 32-8 is connected to a flip-flop circuit 31-. It is also supplied to each reset terminal R of 1 to 31-8. The note clock signals NCI to NC8 are applied to the flip-flop circuits 31-1 to 31-3.
When input to each cent terminal S of 1-8, the same circuit 3
The output Q of 1-1 to 31-8 becomes high level "1",
AND gates 32-1 to 32-8 each output a high-level "1" signal as note clock signal NC via OR gate 33 at the channel timing based on channel timing pulse signals CHI to CH8. The clock signal NC is a signal obtained by time-division multiplexing the note clock signals NGI to NC8 for each channel. In addition, this AND gate 32-1 to 32
The high level "1" signal from -8 is also supplied to each reset terminal R of the flip-flop circuits 31-1 to 31-8 to reset each flip-flop circuit 31-1 to 31-8. Flip-flop circuits 31-1 to 3
Since each output Q of 1 to 8 becomes a low level "0", the note clock signal NG is equal to each note clock signal NGI to NGI.
This is a signal that becomes high level "1" only once at the channel timing when C8 changes from low level "0" to high level "1". Furthermore, each output Q of the flip-flop circuits 31-1 to 31-8 is outputted to the pitch synchronization circuit 6 as pitch synchronization pulse signals PSP1 to PSP8.
They are also output to 0 respectively.

And these pitch synchronized pulse signals PSP 1 to P
SP8 rises in synchronization with each note clock signal NCI to NC8, and each channel timing pulse signal C
The pitch synchronization circuit 60 uses these signals PSP as described later.
Since only the rise timings of PSP1 to PSP8 are used, these signals PSP1 to PSP8 are used as signals with a frequency that is approximately an integral multiple of the frequency of the rhythm instrument sound assigned to each channel, and the channel timing is It's irrelevant. 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 NCI to NC8 as the pinch synchronization pulse signals PSP1 to PSP8.

The phase data generator 40 inputs the note clock signal NC from the multiplexing circuit 30 and 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. Before explaining the details of this phase-data generator 40, the waveform data stored in the waveform memory 50 will be described for convenience of explanation. As shown in FIG. 5, the waveform memory 50 has cymbal 1, cymbal 2
A plurality of areas 50-a, 50-b, 5Q-c, etc. store waveform data for each rhythm instrument sound such as snare drum, etc.
..., and each waveform data consists of a plurality of sampling data obtained by sampling the instantaneous values of musical sound 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 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 the first address ( Star address) SADR-a, 5ADR-b, 5ADR
This indicates the number of the address counting from -c...

Next, the phase data generator 40 will be explained in detail with reference to FIG.
1 and an adder 4 that updates this relative address signal ADR.
2, and an adder 43 for converting this 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 is controlled by a channel clock signal φ so that the relative address signal ADH stored in the previous stage is sequentially transferred to the next stage. The relative address signal ADH from the final stage is supplied to one input of the adder 42. The adder 42 inputs the note clock signal NC to the other input via the gate circuit 44, and calculates the relative address of the channel in response to the arrival of the note clock signal NG of high level "1" for each time division channel. Add "1" to signal ADR. 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 "01" to make the gate circuit 45 conductive.
An AND gate 45a is connected to output a control signal to turn 5 into a non-conductive state. This AND gate 45a is
Input the rhythm start signal ST to one input terminal,
And the rhythm pattern pulse signal RP is input to the other input terminal via the inverter 45b, and the rhythm pattern pulse signal RP goes high only when the rhythm start signal ST is at the high level "1" and the rhythm pattern pulse signal RP is at the low level "O". A control signal of level “1” is output to the gate circuit 45. As a result, when the rhythm start control switch 14 is opened and the automatic rhythm performance is stopped, the gate circuit 45
is made non-conductive and outputs a signal indicating "0" to the first stage of the shift register 41 at all time division channel timings, and the relative address signal ADR of all channels of the shift register 41 is set to "0". .

Further, when the rhythm start control switch 14 is closed to enter the automatic rhythm performance state, the gate circuit 45 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. Then, a signal indicating rOJ is output to the first stage of the shift register 41 only at the relevant channel timing, and is controlled to be conductive at other timings, and each signal supplied from the adder 42 to the first stage of the shift register 41 is controlled to be in a conductive state at other timings. Outputs relative address signal ADR for each channel. Therefore, in this state, the relative address signal ADH of each channel becomes "0" when the rhythm instrument assigned to the channel starts sounding, and then the high level 111+ at the timing of the channel.
This indicates a value that is sequentially increased by "1" each time a note clock signal NC of 1 is generated.

On the other hand, a comparator 46 is connected to the gate and circuit 44 that controls passage of the note clock signal NG, and the comparator 46 inputs the relative address signal ADR from the shift register 41 to one input terminal thereof. , and input the end address signal from the end address memory 47 to the other input terminal, and when the values indicated by both signals match, the low level "
It outputs a control signal of "0" to make the gate circuit 44 non-conductive, and otherwise outputs a control signal of high level "1" to make the gate circuit 44 conductive. is each area 50-a of the waveform memory 50
, 50-b, 50-c, etc., and is controlled by rhythm instrument data RTND supplied at each time-division channel timing.
The read final relative address value of the musical sound waveform of the rhythm instrument assigned to each channel is output as an end address signal. As a result, when the relative address signal ADH for each channel updated by the shift register 41 and 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 becomes non-conductive. Under the control of this state, the supply of the note clock signal NC to the adder 42 in the channel is stopped, and the updating of the relative address signal ADR in the channel is stopped.

The output end of the shift register 41 is also connected to one input end of an adder 43, and the other input end of the adder 43 is connected to a start address memory 48. The start address memory 48 corresponds to each area 50-a, 50-b of the waveform memory 50.

Each start address 5ADR-a, 5 of 50-c...
It stores ADR-b, 5ADR-c --...
Each start address 5 of the musical sound waveform of the rhythm instrument sound assigned to each channel under the control of the rhythm instrument data RTND supplied at each channel timing
A start address signal indicating ADR-a, 5ADR-b, 5ADR-c, . . . is output. 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. An absolute address signal MADR indicating an absolute address for the musical waveform of the rhythm instrument sound is output to the waveform memory 50.

Based on the absolute address signal MADR, the waveform memory 50 time-divisionally outputs sampling data of the musical waveform of the rhythm instrument sound assigned to each channel to the multiplier 51 as musical waveform data WD in synchronization with the timing of each channel. . 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. and a control circuit that inputs the rhythm instrument data RTND and controls the above calculation to determine the envelope waveform shape of each channel, and a high-level "1" rhythm pattern pulse supplied at each channel timing. 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 if 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, the multiplier 51 and the envelope generator 52 are unnecessary.

The pinch synchronization circuit 60, as shown in detail in FIG.
A plurality of latch circuits 61-1 to 61-8 forming a demultiplex circuit for demultiplexing D, and converting these demultiplex outputs into musical sound waveform data EWD* synchronized with the pitch of the rhythm instrument sound assigned to each channel. - A priority circuit 63 that outputs pitch synchronization signals of each channel in a predetermined priority order.

Latch circuits 61-1 to 61 to 8 are controlled by channel timing pulse signals CHI to CH8, respectively, and separate time-sharing musical waveform data EWD supplied from the multiplier 51 in synchronization with each channel timing for each channel. Remember. The selector 62 selects each launch circuit 61-1 to 61
Pitch synchronized pulse signals PSP1* of each channel are inputted in parallel with musical waveform data EWD of each channel outputted in parallel from . ~PSP8*, the tone waveform data EWD of the channel to which the pitch synchronized pulse signals PSP1*~PSP8*, which have become high level "1", belong are selectively outputted as tone waveform data EWD* synchronized with the pitch. The priority circuit 63 is
Flip-flop circuit 65-1 corresponding to each channel
- 65-8 are input, and when the signals are input at the same time, the signals of channels with smaller numbers are output with priority. These flip-flop circuits 65-1~
65-8 are each set to the set state (Q=“1”) in synchronization with the rise of the pitch synchronization pulse signals PSP1 to PSP8 input to each set terminal S, respectively, and are respectively supplied to each reset terminal R. And gate 64-1~
Pitch synchronization pulse signal PSP1*~PS from 64-8
In synchronization with the fall of P8*, each reset state (Q=“
In addition, each output signal of the priority circuit 63 is set to AND gates 64-1 to 64-1 corresponding to each channel.
64-8, and a pitch synchronization clock signal φO is supplied to the other inputs of these AND gates 64-1 to 64-8. Therefore,
When any one of the pitch synchronization pulse signals PSP1 to PSP8, for example PSPn (where n is an integer between 1 and 8) rises from a low level "0" to a high level "1", the channel to which this signal PSPn belongs The output signal Q of the flip-flop circuit 65-n corresponding to n becomes high level "1", and this high level "1" signal is passed through the priority circuit 63 to the above-mentioned signals in the AND gates 64-1 to 64-8. It is output to an AND gate 64-n corresponding to channel n, and this AND gate 64-n generates a pitch synchronization pulse signal PSPn* consisting of a pulse signal equal to the pulse width of the pitch synchronization clock signal φ0. Furthermore, since the flip-flop circuit 65-n is reset in synchronization with the fall of the pitch synchronization pulse signal PSPn*, the pinch 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 psp i to PSP8, for example, PSPm
, PSPn (where m and n are integers from 1 to 8, and there is a relationship of m<n) are simultaneously at the regrettable low level “O”.
When the high level rises to “1” from
is a flip-flop circuit 6 of channel m with a small number.
Since the output signal of 5-m is output with priority, after the flip-flop circuits 65-m and 65-n are set to the cent state at the same time, the pitch synchronization pulse of the next high level "1" is output according to the pinch synchronization clock signal φ0. Signal PSPm*, PS
Pn* are sequentially output. As a result, the tone waveform data EWD* of a channel with a smaller number is more accurately synchronized with the tone pitch of that channel.

The D/A converter 70 is connected to the selector 62, and this D/A converter 70 converts the musical waveform data EWD* into an analog signal, and converts this analog signal into the pitch of the musical tone assigned to each channel. time-division output in synchronization with

The channel allocation circuit 80 uses FET gates 81 provided for each channel, as shown in detail in FIG.
-1 to 81-8 and these FET games) 81-1 to 8
A buffer amplifier 82- connected to each output of 1-8.
1 to 82-8, and a capacitor 83- whose one end is connected to each connection point of the FET gates 81-1 to 81-8 and the buffer amplifiers 82-1 to 82-8 and whose other end is grounded.
1 to 83-8, and these FET gates 81
-1 to 81-8, buffer amplifiers 82-1 to 82-8, and capacitors 83-1 to 83-8 form a sample hold circuit corresponding to each channel. Each input terminal of the FET 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 to 8 is connected to a pitch synchronization circuit. 60 AND gates 64-1 to 64-8. And this 0jFET game l-
81-1 to 81-8 are pitch synchronization pulse signals PSP 1
The conduction is controlled based on each high level "11 signal of *~PSP8*, and the time-sharing analog signal supplied from the D/A converter 70 in synchronization with the pitch of the rhythm instrument sound assigned to each channel is connected to the capacitor 83. -1 to 83-8
Each is memorized in .

As a result, an analog signal representing the tone waveform of each channel is outputted from the buffer amplifiers 82-1 to 82-8 for each channel.

The sound system 90 is divided into channels by the circuit 80.
multiple mixing circuits that mix analog musical waveform signals output from each channel separately at appropriate ratios;
It is equipped with a plurality of power amplifiers each connected to a plurality of mixing circuits and amplifying the output of each mixing circuit, and a plurality of speakers connected to each power amplifier and arranged at spatially separate positions, The musical tones (rhythm instrument sounds) assigned to each channel are localized at different spatial positions and produced. This sound system 9
It is also possible to provide effect circuits such as reverb and tremolo in the 0, and to emit musical tones with the above-mentioned effects applied to each channel.

To summarize the operation of the automatic rhythm performance 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 61'', and also generates a rhythm selection signal R3S, rhythm instrument data RTND, and a rhythm pattern pulse signal RP according to the selected rhythm type.

This rhythm selection signal R3S is pitch data memo +720
The pitch data memory 2o outputs pitch data PDI to PD8 corresponding to the rhythm instrument sounds assigned to each channel as shown in Table 1 above to the clock generator 21.
-1 to 21-8 respectively, and clock generator 21-1
.about.21-8 output note clock signals NCI.about.NCB for each channel based on the pitch data PDI.about.PD8, which are substantially integral multiples of the musical tone frequency of the rhythm instrument sound. These note clock signals NCI to NC8 for each channel are converted by the multiplexing circuit 30 into a time division note clock signal NC synchronized with the channel timing, and then supplied to the phase data generator 40. The phase data generator 40 is controlled by this time-division note clock signal NC, and time-divisionally generates an address signal MADR (phase data) that changes at a speed proportional to the musical tone frequency and represents the phase of the musical waveform for each channel. This address signal MADR is time-divisionally output to the waveform memory 50 in synchronization with the 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 a time-division manner in synchronization with the channel timing as musical waveform data WD.

On the other hand, the envelope generator 52 generates rhythm instrument data R.
Based on TND and rhythm pattern pulse signal RP, envelope waveform data of rhythm instrument sounds assigned to each channel is formed and output in synchronization with channel timing. This envelope waveform data and the musical tone waveform data WD are multiplied by a multiplier 51, and the musical waveform data EWD to which an envelope has been added is output from the multiplier 51 to the pinch synchronization circuit 60 in synchronization with the channel timing. .

The musical sound waveform data EWD of each channel supplied to the pitch synchronization circuit 60 in a time-division manner is transmitted to the launch circuits 61-1 to 61.
-8, the musical waveform data EWD latched for each channel, opened and notched for each channel is selected by selector 6.
2, each is selected at pitch synchronized timing and output as musical waveform data EWD*. That is, the selector 62 selects the pitch synchronization pulse signals PSP 1 *~PS supplied from the multiplexing circuit 30 via the priority circuit 63.
Based on P8*, the tone waveform data EWD of each channel supplied from the latch circuits 61-1 to 61-8 is selectively outputted, so the tone waveform data EWD* output from the selector 62 is assigned to each channel. The result is a time-division multiplexed signal synchronized with the pitch of the rhythm instrument sound.

Then, this musical waveform data EWD* is transferred to the D/A converter 7.
After being converted into an analog signal at the circuit 80, the channel distribution controlled by the pitch synchronized pulse signals PSP1* to PSP8* is separated into musical tone signals consisting of analog signals for each channel at the circuit 80, and the sound is generated. The sound is generated from the system 90.

As described above, according to the above embodiment, the musical sound waveform data EWD of each channel, which is time-divisionally supplied to the pitch synchronization circuit 60 in synchronization with the channel timing, is transmitted to the latch circuit 61-1 in the pitch synchronization circuit 60. ~61-8 and the selector 62, it is converted into musical sound waveform data EWD* that changes in synchronization with the pitch of the generated musical tone for each channel,
This converted musical waveform data EWD* is converted into an analog signal by a D/A converter 70. As a result, D
The /A converter 70 obtains a time-division analog musical tone signal which can be distributed by channel and is synchronized with the pitch of the generated musical tone. This time-division analog musical tone signal is
The channel distribution controlled by the pitch synchronized pulse signals PSP1* to PSP8'k is extracted in the circuit 80 as analog musical tone signals for each spatially separated channel, so that musical tones can be reproduced for each channel. It becomes possible. Further, in the pinch synchronization circuit 60, the priority circuit 63 simultaneously sends a high level ``1'' pinch synchronization pulse signal %PSP1* to PSP in a plurality of channels.
P8* is not generated, and pitch synchronized pulse signals PSP1* to PSP8* are output that are precisely synchronized with the pitch of a rhythm instrument with a strong sense of pitch, so that the musical waveform data of each channel is At the same time D
/A converter 70 is no longer input, and the degree of separation of musical tone signals taken out 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 pinch synchronization signal PSPI~
Since it is rare for a plurality of signals in the PSP 8 to become high level "1" at the same time, it is also possible to omit the priority circuit 63 in the pinch synchronization circuit 60. In this case, the latch circuits 61-1 to 61 of the pitch synchronization circuit 60 of the above embodiment
-8 and selector 62 may be replaced with a circuit as shown in FIG. This circuit includes the latch circuits 61-1 to 61-1.
Pitch synchronization pulse signal P5PI is applied to each output of 61-8.
) k ~ Gate circuits 62-1 to 6 controlled by PSP8*
2-8 and these gate circuits 62-1 to 62-
It consists of an adder 66 that adds each tone waveform data from 8 to 8. With this configuration, the pitch synchronization signal p
Since the priority circuit 63 is omitted, multiple signals in the pitch synchronization pulse signals PSP1* to PSP8* become high level "1" at the same time. However, since the gate circuits 62-1 to 62-8 simultaneously output the musical waveform data of the channels to which the plurality of signals belong, and the adder 66 adds and outputs the musical waveform data, the musical tones of the channels There is no problem with circuit operation such as deletion of waveform data.

In this case, the output data of the adder 66 is - instantaneous for multiple channels only at the timing when multiple signals among the pinch synchronization pulse signals PSP 1 * to PSP8'l' become high level "1" at the same time. This shows the synthesized musical sound waveform data, and this data is divided into channels by capacitors 83-1 to 83 in the circuit 80.
-8 and the low-pass filter action in the sound system 90, it is removed and has almost no effect on the generation of musical tones for each channel. Note that in this case as well, as described above, the pitch synchronization pulse signals PSP 1 * to PSP 8 *
Instead, the note clock signals NCI to NC8 may be supplied to the gate circuits 62-1 to 62-8.

Furthermore, in the above embodiment, the circuit 80 distributes musical sound waveform signals to each channel in the channel distribution, but once the number of musical tone generation series in the sound system 90 is determined, the musical sound waveform signal is distributed according to the number of series in the sound system 90. It is also possible to divide it into numbers.

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 circuit 80 for channel distribution, and the sample and hold circuits are connected to the pitch synchronized pulse signal PSP 1 *~P.
It is preferable to group SP8* into two groups 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, the digital data representing the musical sound waveform is digital data (PCM data) representing the instantaneous value of the musical sound waveform.
However, as this digital data, difference data representing the difference between the waveform instantaneous value at the previous sample point and the waveform instantaneous value at the next sample point may be adopted. In this case, the sound system 90
An accumulator may be interposed which accumulates the digitally or analogously supplied differential signal during the transfer of the musical tone signal to the musical tone signal.

Further, in the above embodiment, the musical tone generating device according to the present invention is applicable to an automatic rhythm playing device, but this musical tone generating device can also be applicable to an electronic musical instrument that generates performance sounds from a keyboard or the like. It is something. In this case, the 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, and the above-mentioned implementation is performed. Instead of the example rhythm pattern signal RP, the envelope generator may be controlled by a key-on signal based on key depression.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention corresponding to 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 timing signals generated from the timing signal generator of FIG. 1, FIG. 4 is a circuit diagram showing a detailed example of the multiplexing circuit and phase data generator of FIG. 2, and FIG. 5 is a diagram showing an example of the memory map of the waveform memory in FIG. 2, FIG. 6 is a circuit diagram showing a detailed example of the pitch synchronization circuit and channel distribution circuit in FIG. 2, and FIG. It is a figure which shows the modification of the pitch synchronization circuit of a figure. Explanation of symbols 10... Rhythm data generation section, 20... Pitch data memory, 21-1 to 21-8... Clock generator,
30... Multiplexing circuit, 40... Phase data generator,
50... Waveform memory, 60... Pitch synchronization circuit,
61-1 to 61-8... Launch circuit, 62... Selector, 62-1 to 62-8... Gate circuit, 63...
・Priority circuit, 64-1 to 64-8...AND gate,
65-1 to 65-8...Flip-flop circuit, 66
...Adder, 70...D/A converter, 80...Channel distribution circuit, 90...Sound system,
100...timing signal generator.

Claims (2)

[Claims] (1) In a musical tone generating device that has a plurality of musical tone generation channels and generates desired musical tones 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 individually generated. musical waveform data generation means for time-divisionally generating musical waveform data for each channel; and time-division canceling means for demultiplexing the musical waveform data of each channel generated from the musical waveform data generating means in a time-divisional manner and outputting the demultiplexed musical waveform data in parallel for each channel. and 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; selection gate means for selectively outputting musical sound waveform data when each pulse of the pulse train signal for the channel is generated; and digital-to-analog converting means for converting the selectively output musical sound waveform data into an analog signal and outputting the analog signal for each selective output. A pitch-synchronized musical tone generator characterized by comprising: (2) In a musical tone generating device that has a plurality of musical tone generating channels and generates desired musical tones in each channel, each musical tone waveform data consisting of digital data representing the waveform of the musical tone to be generated in each channel is a musical waveform data generation means for generating time-divisionally generated musical waveform data for each channel; and a time-division canceling means for demultiplexing the musical waveform data of each channel generated from the musical waveform data generating means in a time-divisional manner and outputting the same in parallel for each channel. and 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; selection gate means for selectively outputting musical sound waveform data when each pulse of the pulse train signal for the channel is generated; and digital-to-analog converting means for converting the selectively output musical sound waveform data into an analog signal and outputting the analog signal for each selective output. A pitch-synchronized musical tone generator comprising: and 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.