JP2007272020A - Musical sound generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lighten the load on a CPU when echo effect is generated. <P>SOLUTION: A musical sound generator comprises a CPU 3 which calculates control parameters representing a start address, an F number addition value, and a plurality of envelope data, an F number accumulator 32 which calculates a readout address by adding the F number addition value to the start address, a readout unit 33 which reads readout waveform data corresponding to the readout address out of a waveform memory 12 and generates a musical sound, and envelope generators 34 and 35 which add envelopes to a musical sound based upon one of a plurality of envelope data. At this time, the F number accumulator 32 does not add the F number addition value when the envelope data corresponds to a predetermined phase. At this time, the musical sound generator can control the addition of the F number addition value to the start address only by varying only the envelope data, and the load on the CPU 3 when the addition is controlled can be lightened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a musical sound generator, and more particularly to a musical sound generator used when an echo effect is added to a musical sound.

  A method for digitally generating an echo effect is known. Examples of the method include a method using an external delay circuit of a DSP and a method using a multi-key assigner of a CPU. The method using the multi-key assigner of the CPU assigns a plurality of musical sound waveforms in order with some time lag. According to such a method, it is necessary for the CPU to manage the time lag, the processing becomes complicated, and the load on the CPU is large. It is desired to reduce the burden on the CPU when digitally generating the echo effect.

  Japanese Patent Application Laid-Open No. 03-113499 discloses an electronic musical instrument that can provide a chase effect that is rich in change. The electronic musical instrument generates a musical sound each time a musical sound is generated in an electronic musical instrument that generates a musical sound indicated by the note information a plurality of times at time intervals according to one piece of note information indicating a key depression. A generation timing means for setting a different musical sound generation timing so that a time interval from the time point to the next musical sound generation time point is different from a time interval from the previous musical sound generation time point to the current musical sound generation time point; And a tone generation means for generating a tone according to the generation timing set by the generation timing means.

  Japanese Patent Application Laid-Open No. 11-305768 discloses a reverberation of an electronic musical instrument that can exert an echo effect and a reverberation effect accompanied by a change in timbre with a simple configuration without imposing a burden on control means such as a microcontroller and a CPU. An effect addition control device is disclosed. The reverberation effect adding device of the electronic musical instrument transfers control parameters including a waveform readout address and an envelope coefficient at the same timing to a plurality of musical tone generation channels based on one key-on information, and controls the start of sound generation And waveform storage means for storing an arbitrary musical sound waveform, and based on the control parameters transferred from the control means and assigned to a plurality of musical sound generation channels, the musical sound waveform data is read from the waveform storage means and subjected to filter processing. And a tone signal generating means for generating a tone signal by adding an envelope to the waveform data, and a tone generating means for generating a tone based on the tone signal generated for each tone generating channel by the tone signal generating means And the control means is assigned based on the one key-on information. The control parameters are transferred to the tone signal generation means so that sound generation starts at a substantially different timing for each tone generation channel, and at least two different filter coefficients are set for each assigned tone generation channel. Thus, the tone of the channel that is sounded late is controlled so that the harmonic component is less than that of the channel that is sounded early.

Japanese Patent Laid-Open No. 03-113499 Japanese Patent Laid-Open No. 11-305768

However, in the method disclosed in Japanese Patent Laid-Open No. 03-113499, the CPU needs to count a plurality of musical sound generation intervals, and must use a timer function or the like, and a plurality of musical sound generation processes at different timings. In order to do so, an overhead for interruption (work memory push-pop processing, etc.) occurs each time.
In this regard, the method disclosed in Japanese Patent Laid-Open No. 11-305768 is a considerably improved method without the timer function and the overhead in order to process a plurality of musical sound generations at one timing. However, there was room for further improvement in terms of how to reduce the CPU processing. That is, in the method disclosed in Japanese Patent Application Laid-Open No. 11-305768, a different retroactive start address must be calculated and set for each of a plurality of musical sound occurrences. Therefore, such an increase in the CPU processing burden forms one factor that indicates a time delay from the key-on operation to the generation of the musical sound.
The present invention obtains an echo effect by a multi-key assigner that reduces the burden on the CPU as much as possible.

  An object of the present invention is to provide a musical sound generator that reduces the burden on the CPU when generating an echo effect.

  In the following, means for solving the problems will be described using the reference numerals used in the best modes and embodiments for carrying out the invention in parentheses. This reference numeral is added to clarify the correspondence between the description of the claims and the description of the best mode for carrying out the invention / example, and is described in the claims. It should not be used to interpret the technical scope of the invention.

  The musical tone generator according to the present invention includes a CPU (3) that calculates a control parameter indicating a start address, an F number addition value, and a plurality of envelope data in response to an operation of the input device, and an F number addition value for the start address. An F number accumulator (32) for calculating a read address by accumulating, and reading out waveform data corresponding to the read address from a waveform memory (12) for recording a plurality of waveform data in association with the plurality of addresses to generate a musical sound. A reading unit (33) for generating and an envelope generator (34, 35) for adding an envelope to a musical tone based on one envelope data among a plurality of envelope data are provided. The plurality of envelope data corresponds to a plurality of phases that divide periods in which musical sounds are generated. At this time, the F number accumulator (32) does not accumulate the F number addition value when the envelope data corresponds to a predetermined phase. At this time, the musical tone generator can control the accumulation of the F number addition value to the start address by changing only the envelope data, and the CPU (3) has a burden on controlling the accumulation. Can be reduced.

  The F number accumulator (32) includes a selector (41) and an adder (43) that adds the F number addition value and the value output by the selector (41) and outputs a read address. . The selector (41) preferably outputs a start address when the envelope data corresponds to a predetermined phase, and outputs a value output by the adder (43) when the envelope data does not correspond to the predetermined phase.

  The F number accumulator (32) outputs the read address by adding the selector (41), the gate (42), the value output by the gate (42) and the value output by the selector (41). And an adder (43). The selector (41) outputs a start address immediately after the operation, and outputs a value output by the adder (43) after outputting the start address. The gate (42) preferably outputs 0 when the envelope data corresponds to a predetermined phase, and outputs an F number addition value when the envelope data does not correspond to a predetermined phase.

  The control parameter includes a first control parameter and a second control parameter. At this time, the phase continuation period indicated by the envelope envelope corresponding to the predetermined phase of the plurality of envelope data of the first control parameter is the phase continuation indicated by the envelope envelope corresponding to the predetermined phase of the plurality of envelope data of the second control parameter. It is preferable that the period is different.

  The predetermined phase is the first phase of the plurality of phases. At this time, the musical sound generating device can shift the timing at which a plurality of musical sounds generated based on the same waveform data are generated by changing only the envelope data, and by synthesizing the plurality of musical sounds. The burden on the CPU (3) when adding the echo effect to the musical sound can be reduced.

  The control parameter further indicates a loudness indicating the magnitude of the musical sound. At this time, the loudness indicated by the first control parameter is preferably different from the loudness indicated by the second control parameter.

  The musical tone generator according to the present invention can reduce the load on the CPU when generating the echo effect.

  An embodiment of a musical sound generating device according to the present invention will be described with reference to the drawings. The musical tone generator is applied to an electronic musical instrument 1 as shown in FIG. The electronic musical instrument 1 is connected via a bus 2 so that a plurality of hardware can bidirectionally transmit information to each other. The bus 2 is formed of an address bus, a data bus, and a signal bus. The plurality of hardware includes a CPU 3, a ROM 5, a RAM 6, a keyboard unit 7, an operation panel unit 8, a tone signal generator 11, a waveform memory 12, a DSP 14, a D / A converter 15, an amplifier 16, and a speaker 17. Yes.

  The keyboard unit 7 is a keyboard having a plurality of keys for playing. That is, the plurality of keys are formed of a plurality of white keys and a plurality of black keys, and each correspond to a plurality of different pitches. The keyboard unit 7 outputs an electric signal indicating the key that has been pressed and the key strength. The operation panel unit 8 includes an LCD, a plurality of switches, and a volume knob. The LCD is a display surface of a liquid crystal display, and the liquid crystal display displays a screen generated by the CPU 3 and displays, for example, a volume and a tone color setting state. The operation panel unit 8 outputs an electrical signal indicating the operated switch among the plurality of switches to the CPU 3, and outputs an electrical signal indicating the angle of the volume knob to the CPU 3. For example, the user operates the operation panel unit 8 to generate information, and sets a timbre, for example.

  The ROM 5 is a read-only memory, and records a computer program and parameter data necessary for generating musical sounds. The RAM 6 is a readable / writable memory that temporarily stores processing stage data and stores parameter data that can be edited. Further, the RAM 6 is partly or wholly backed up by a battery, and stores and holds necessary data relating to tone color settings even when the electronic musical instrument 1 is powered off.

  The CPU 3 executes a computer program recorded in the ROM 5 and controls the RAM 6, the keyboard unit 7, the operation panel unit 8, the musical tone signal generator 11, and the DSP 14. That is, the CPU 3 scans the keyboard unit 7 and the operation panel unit 8 to generate key information and timbre volume information. The key information indicates key ON / OFF and touch information in association with a plurality of key numbers for identifying the keys of the keyboard unit 7. The key ON / OFF indicates whether the key identified by the key number is pressed or released. The touch information indicates the key pressing strength when the key identified by the key number is pressed. The timbre volume information indicates a plurality of timbres set for a plurality of channels by operating a switch of the operation panel unit 8 and an angle of a volume knob of the operation panel unit 8. The CPU 3 calculates a plurality of control parameters based on the key information, timbre volume information, key information, and timbre volume information, and supplies them to the tone signal generator 11.

  The waveform memory 12 records a plurality of waveforms. The plurality of waveforms correspond to a plurality of timbres and tone ranges (pitches) that the electronic musical instrument 1 can emit. Each of the waveforms indicates a waveform of a musical sound generated from the electronic musical instrument 1 (that is, an amount that changes with time), and an address is associated with waveform data. The address corresponds to the time of the waveform and indicates an address for identifying a position in the waveform memory 12. The waveform data indicates an instantaneous value of the waveform displacement at the time corresponding to the address. The plurality of timbres are associated with a head address, a loop top address, and a loop end address. The head address, the loop top address, and the loop end address indicate addresses of the waveform memory 12, respectively. The head address indicates the address where the top of the waveform in the waveform memory 12 is recorded. The loop top address indicates an address after the head address. The loop end address indicates an address that is later in sequence than the loop top address. The waveform is formed of a head portion and a loop portion. The head portion corresponds to the portion of the waveform recorded from the head address of the waveform memory 12 to the loop top address. The loop portion corresponds to the portion of the waveform recorded from the loop top address to the loop end address. The waveform of the musical sound generated from the electronic musical instrument 1 is formed by repeating the head portion and the loop portion after the head portion. The waveform memory 12 outputs waveform data corresponding to an address input from the outside.

  The musical tone signal generator 11 refers to the waveform memory 12 and generates a digital musical tone signal indicating a musical tone emitted from the electronic musical instrument 1 based on a plurality of control parameters generated by the CPU 3. The DSP 14 calculates an effect based on a plurality of control parameters generated by the CPU 3, and generates a digital musical tone signal indicating a musical tone in which the effect is added to the musical tone indicated by the digital musical tone signal generated by the musical tone signal generator 11. To do. The D / A converter 15 is a digital-analog converter that converts the digital musical tone signal generated by the DSP 14 into an analog musical tone signal. The amplifier 16 performs simple filter processing (for example, noise removal) and amplification processing on the analog musical tone signal generated by the D / A converter 15 and amplifies the analog musical tone signal to be generated by the speaker 11. It is a power amplifier. The speaker 17 is formed of a plurality, and converts the analog tone signal amplified by the amplifier 16 into an audible signal and emits the sound.

  FIG. 2 shows a plurality of control parameters calculated by the CPU 3. The number of control parameters corresponds to the number of musical sounds (that is, the number of channels) that the electronic musical instrument 1 can emit simultaneously, and is, for example, 64. The control parameters correspond to the plurality of musical sounds on a one-to-one basis, and are formed of waveform data reading data, envelope control data, loudness, and control flags, respectively.

  The waveform data reading data is formed of a start address, an F number addition value, a loop top address, and a loop end address. The start address indicates the address of the waveform memory 12 where the top waveform data of the head portion of the musical sound is recorded. The F number addition value is a value used when calculating the address of the waveform memory 12. The loop top address indicates the address of the waveform memory 12 where the top waveform data of the loop portion of the musical sound is recorded. The loop end address indicates the address of the waveform memory 12 where the last waveform data of the loop portion of the musical sound is recorded.

  The envelope control data is formed from four phase data. The phase data corresponds to four phases (ph0 to ph3 or ph4 to ph7) into which the envelope added to the musical sound is divided, and includes speed data SPD, − / + flag data, and phase end value data PEP, respectively. And FACC hold. The speed data SPD indicates the absolute value of the amount by which the level changes per unit time in the corresponding phase. The − / + flag data indicates a sign (− / +) of an amount whose level changes per unit time. The phase end value data PEP indicates the last level of the corresponding phase. The FACC hold indicates whether the FACC is accumulated in the corresponding phase. At this time, the phase continuation period in which each phase continues is set almost arbitrarily by appropriately setting the speed data SPD, − / + flag data, and phase end value data PEP based on the initial value of the envelope level. can do.

  The loudness indicates a value used when controlling the amplitude envelope of the musical sound. The control flag is formed of a FACC clear, a ph clear, an EACC clear, a filter coefficient, and an L / R flag. FACC clear indicates whether or not to clear the register storing the FACC. “ph clear” indicates whether or not to clear the register storing the phase. The EACC clear indicates whether or not to clear the register storing the EACC. The filter coefficient indicates a numerical value used for a filter (high pass, low pass, band pass, band reject) performed on the musical sound. The L / R flag indicates whether the sequence for outputting the musical sound is on the L side or the R side.

  When adding the echo effect, the CPU 3 generates two or more control parameters corresponding to two or more musical sounds. The control parameters are further different from each other in phase data and loudness of ph0, and are equal to each other except for phase data and loudness of ph0. The control parameters can also be calculated so that the phase data of ph0 are different from each other and the values excluding the phase data of ph0 are equal to each other.

  In FIG. 3, the tone signal generator 11 includes an assignment memory 30, a timing generator 31, an F number accumulator 32, a sampling interpolation filter 33, an envelope accumulator 34, a first multiplier 35, and a second multiplier. 36 and a series accumulator 37.

  The timing generator 31 generates a clock necessary for performing time division processing. The assignment memory 30 records a plurality of control parameters generated by the CPU 3, and synchronizes the control parameters with the clock generated by the timing generator 31, and outputs the plurality of control parameters to the F number accumulator 32, the sampling interpolation filter 33, and the like. To the second multiplier 36.

  The envelope accumulator 34 clears the register that stored the envelope accumulation value EACC when the EACC clear indicates clearing. The envelope accumulator 34 further accumulates the speed data SPD of the first phase data of the envelope control data in the envelope accumulation value EACC stored in the register (-/ + flag data is +). The envelope is calculated by adding when subtracting and subtracting when the-/ + flag data indicates-. Further, when the envelope accumulator value EACC reaches the phase end value data PEP, the envelope accumulator 34 accumulates the envelope accumulator value EACC using the next phase data to calculate an envelope. The envelope accumulator 34 further outputs a FACC hold of phase data corresponding to the phase indicated by the envelope accumulator value EACC to the F number accumulator 32.

  When the FACC clear indicates that the FACC clear is to be cleared, the F number accumulator 32 clears the register that has stored the frequency accumulation value FACC. The F number accumulator 32 further includes the FACC recorded in the register, the FACC hold output from the envelope accumulator 34, the start address of the control parameters, the F number addition value, the loop top address, and the loop end. The frequency accumulation value FACC is calculated based on the address, and the frequency accumulation value FACC is recorded in the register. The F number accumulator 32 further outputs the integer part of the frequency accumulative value FACC to the waveform memory 12 and outputs the fractional part of the frequency accumulator value FACC to the sampling interpolation filter 33. At this time, the waveform memory 12 outputs waveform data corresponding to the address indicated by the integer part.

  The sampling interpolation filter 33 interpolates the waveform data output from the waveform memory 12 based on the decimal part output from the F number accumulator 32. The sampling interpolation filter 33 filters the waveform data subjected to the interpolation processing based on the filter coefficient among the control parameters, and generates a musical tone signal.

  The first multiplier 35 calculates a musical sound signal obtained by multiplying the musical sound signal generated by the sampling interpolation filter 33 by the envelope calculated by the envelope accumulator 34. The second multiplier 36 calculates a musical sound signal by multiplying the waveform data calculated by the first multiplier 35 by the loudness of the control parameters.

  The series accumulator 37 classifies the music signals for 64 channels output from the second multiplier 36 into an L-side series and an R-side series based on the L / R flag of the control parameters. To do. The sequence accumulator 37 further synthesizes the L-side sequence of musical sounds to generate an L-side sequence of musical tone signals, and synthesizes the R-side sequence of musical tones to generate an R-side sequence of musical tone signals. .

  FIG. 4 shows the F number accumulator 32. The F number accumulator 32 includes a selector 41, a gate 42, an adder 43, and a calculator 44. The selector 41 outputs the start address of the control parameters when it is output for the first time after the key of the keyboard unit 7 is pressed, and outputs the value output by the adder 43 after outputting the start address. . The gate 42 outputs the F number addition value of the control parameters when the FACC hold output from the envelope accumulator 34 is accumulated, and indicates that the FACC hold is not accumulated. The value 0 is output when The adder 43 outputs a value obtained by adding the value output from the selector 41 and the value output from the gate 42. The computing unit 44 outputs the value output by the adder 43 when the value output by the adder 43 is smaller than the loop end address of the control parameter. When the value output from the adder 43 is larger than the loop end address, the computing unit 44 calculates the loop top from the value output from the adder 43 so that it is included in the range from the loop top address to the loop end address. A value obtained by subtracting a multiple of the difference between the address and the loop end address is output.

  The operation of the electronic musical instrument 1 includes an operation for generating a musical sound to which no echo effect is added and an operation for generating a musical sound to which an echo effect is added.

  The operation of generating a musical sound to which an echo effect is added is executed when the operation panel unit 8 is operated by the user so that the echo effect is added to the musical sound to be generated. When the key of the keyboard unit 7 is pressed, the CPU 3 of the electronic musical instrument 1 calculates one control parameter corresponding to the key. One control parameter indicates that all FACC holds accumulate. The musical tone signal generator 11 of the electronic musical instrument 1 clears the register that stores the envelope accumulation value EACC, and clears the register that stores the frequency accumulation value FACC. The tone signal generator 11 accumulates the speed data SPD of the first phase of the envelope control data to the envelope accumulation value EACC (added when the − / + flag data indicates +, the − / + flag The envelope is calculated by subtracting when the data shows-. When the envelope accumulation value EACC reaches the phase end value data PEP, the musical tone signal generator 11 accumulates the envelope accumulation value EACC using the next phase data to calculate the envelope. The musical tone signal generator 11 further calculates a value obtained by accumulating the F number addition value of the control parameter to the start address of the control parameter as FACC. The tone signal generator 11 further includes the difference between the FACC and the loop top address so that it is included in the range from the loop top address to the loop end address when the FACC is larger than the loop end address. A value obtained by subtracting a multiple of is output as FACC.

  The tone signal generator 11 further outputs the integer part of the FACC to the waveform memory 12, and reads the waveform data corresponding to the address indicated by the integer part. The tone signal generator 11 interpolates the waveform data based on the fractional part of the FACC, and generates a tone signal by filtering the interpolated waveform data based on the filter coefficient of the control parameters. To do.

  The tone signal generator 11 further adds the envelope to the tone signal and adds the loudness of the control parameters to generate the tone signal. The electronic musical instrument 1 classifies the musical sound signal into an L-side sequence and an R-side sequence based on the L / R flag of the control parameters, and synthesizes the L-side sequence musical sound to generate an L-side sequence. Are generated, and the R side series of musical sounds are synthesized to generate the R side series of musical tone signals. The electronic musical instrument 1 emits an L-side musical tone signal from the L side of the speaker 17 and emits an R-side musical tone signal from the R side of the speaker 17.

  When the key on the keyboard unit 7 is released, the CPU 3 of the electronic musical instrument 1 calculates one control parameter corresponding to the key. The control parameter indicates that FACC clear and EACC clear do not clear the register. The electronic musical instrument 1 emits a musical tone in the same manner as when the key is pressed. That is, the musical tone signal generator 11 calculates the envelope by accumulating the speed data SPD on the envelope accumulation value EACC. When the envelope accumulation value EACC reaches the phase end value data PEP, the musical tone signal generator 11 accumulates the envelope accumulation value EACC using the next phase data to calculate the envelope. The tone signal generator 11 further calculates a value obtained by accumulating the F number addition value to the start address as FACC. The tone signal generator 11 further includes the difference between the FACC and the loop top address so that it is included in the range from the loop top address to the loop end address when the FACC is larger than the loop end address. A value obtained by subtracting a multiple of is output as FACC. The tone signal generator 11 further outputs the integer part of the FACC to the waveform memory 12, and reads the waveform data corresponding to the address indicated by the integer part. The tone signal generator 11 interpolates the waveform data based on the fractional part of the FACC, and generates a tone signal by filtering the interpolated waveform data based on the filter coefficient of the control parameters. To do. The tone signal generator 11 further adds the envelope to the tone signal and adds the loudness of the control parameters to generate the tone signal. The electronic musical instrument 1 classifies the musical sound signal into an L-side sequence and an R-side sequence based on the L / R flag of the control parameters, and synthesizes the L-side sequence musical sound to generate an L-side sequence. Are generated, and the R side series of musical sounds are synthesized to generate the R side series of musical tone signals. The electronic musical instrument 1 emits an L-side musical tone signal from the L side of the speaker 17 and emits an R-side musical tone signal from the R side of the speaker 17.

  The operation of generating a musical sound to which an echo effect is added is executed when the operation panel unit 8 is operated by the user so that the echo effect is not added to the musical sound to be generated. When the key of the keyboard unit 7 is pressed, the CPU 3 of the electronic musical instrument 1 calculates a plurality of control parameters corresponding to the key. In the plurality of control parameters, the waveform data reading data and the control flag match each other. The plurality of control parameters further match the phase data ph1 to ph3 excluding the phase data of the first phase ph0 in the envelope control data. The plurality of control parameters are different from each other in the phase data of the first phase ph0 of the envelope control data. That is, the phase duration indicated by the phase data of phase ph0 is calculated to be different for each of the plurality of control parameters, and the FACC hold of the phase data of phase ph0 indicates that FACC is not accumulated in phase ph0. Yes. The plurality of control parameters are further different in loudness from each other.

  The musical tone signal generator 11 of the electronic musical instrument 1 clears the register that stores the envelope accumulation value EACC, and clears the register that stores the frequency accumulation value FACC. The tone signal generator 11 accumulates the speed data SPD of the first phase of the envelope control data to the envelope accumulation value EACC (added when the − / + flag data indicates +, the − / + flag The envelope is calculated by subtracting when the data shows-. When the envelope accumulation value EACC reaches the phase end value data PEP, the musical tone signal generator 11 accumulates the envelope accumulation value EACC using the next phase data to calculate the envelope. The tone signal generator 11 further calculates the start address of the control parameters as FACC when it indicates that the FACC hold of the phase data corresponding to the phase indicated by the envelope accumulation value EACC does not accumulate. When the musical signal generator 11 indicates that the FACC hold is accumulated, the musical signal generator 11 calculates a value obtained by accumulating the F number addition value of the control parameter to the start address of the control parameter as FACC. The tone signal generator 11 further includes the difference between the FACC and the loop top address so that it is included in the range from the loop top address to the loop end address when the FACC is larger than the loop end address. A value obtained by subtracting a multiple of is output as FACC.

  The tone signal generator 11 further outputs the integer part of the FACC to the waveform memory 12, and reads the waveform data corresponding to the address indicated by the integer part. The tone signal generator 11 interpolates the waveform data based on the fractional part of the FACC, and generates a tone signal by filtering the interpolated waveform data based on the filter coefficient of the control parameters. To do.

  The tone signal generator 11 further adds the envelope to the tone signal and adds the loudness of the control parameters to generate the tone signal. The electronic musical instrument 1 classifies the musical sound signal into an L-side sequence and an R-side sequence based on the L / R flag of the control parameters, and synthesizes the L-side sequence musical sound to generate an L-side sequence. Are generated, and the R side series of musical sounds are synthesized to generate the R side series of musical tone signals. The electronic musical instrument 1 emits an L-side musical tone signal from the L side of the speaker 17 and emits an R-side musical tone signal from the R side of the speaker 17.

  When the key pressed on the keyboard unit 7 is released, the CPU 3 of the electronic musical instrument 1 calculates a plurality of control parameters corresponding to the key. The plurality of control parameters coincide with each other, indicating that each FACC hold accumulates, and indicating that FACC clear and EACC clear do not clear the register. The electronic musical instrument 1 emits a musical tone in the same manner as when the key is pressed. That is, the musical tone signal generator 11 calculates the envelope by accumulating the speed data SPD on the envelope accumulation value EACC. When the envelope accumulation value EACC reaches the phase end value data PEP, the musical tone signal generator 11 accumulates the envelope accumulation value EACC using the next phase data to calculate the envelope. The tone signal generator 11 further calculates a value obtained by accumulating the F number addition value to the start address as FACC. The tone signal generator 11 further includes the difference between the FACC and the loop top address so that it is included in the range from the loop top address to the loop end address when the FACC is larger than the loop end address. A value obtained by subtracting a multiple of is output as FACC. The tone signal generator 11 further outputs the integer part of the FACC to the waveform memory 12, and reads the waveform data corresponding to the address indicated by the integer part. The tone signal generator 11 interpolates the waveform data based on the fractional part of the FACC, and generates a tone signal by filtering the interpolated waveform data based on the filter coefficient of the control parameters. To do. The tone signal generator 11 further adds the envelope to the tone signal and adds the loudness of the control parameters to generate the tone signal. The electronic musical instrument 1 classifies the musical sound signal into an L-side sequence and an R-side sequence based on the L / R flag of the control parameters, and synthesizes the L-side sequence musical sound to generate an L-side sequence. Are generated, and the R side series of musical sounds are synthesized to generate the R side series of musical tone signals. The electronic musical instrument 1 emits an L-side musical tone signal from the L side of the speaker 17 and emits an R-side musical tone signal from the R side of the speaker 17.

  According to such an electronic musical instrument 1, a plurality of musical sounds generated from a plurality of control parameters that are different from each other only in speed data SPD of phase ph0 of envelope control data, − / + flag data, and phase end value data PEP are: As shown in FIG. 5, the timing at which sound generation is started is different. As a result, the electronic musical instrument 1 generates a control parameter in which only the speed data SPD of the phase ph0 of the envelope control data, the − / + flag data, and the phase end value data PEP are different, and the timing at which sound generation is started. A plurality of different musical sounds can be emitted, and a musical sound to which an echo effect is added can be emitted. Such a control parameter greatly increases the burden on the CPU 3 by using a table that associates the speed data SPD of phase ph0 of envelope control data, − / + flag data, and phase end value data PEP with the plurality of musical sounds. It is possible to calculate without doing. For example, the electronic musical instrument 1 adds an echo effect to a musical sound than when generating a plurality of musical sounds using a start address as a start address of a readout waveform as described in JP-A-11-305768. The burden on the CPU 3 when doing so can be reduced.

  In another embodiment of the tone generator according to the present invention, the selector 41 of the F number accumulator 32 in the above-described embodiment is replaced with another selector, and the gate 42 is omitted. At this time, the selector outputs the start address of the control parameter when the FACC hold indicates that the FACC hold is not accumulated, and the adder 43 indicates that the FACC hold is accumulated. Outputs the output value. The adder 43 outputs a value obtained by adding the value output from the selector 41 and the F number addition value. The computing unit 44 outputs the value output by the adder 43 when the value output by the adder 43 is smaller than the loop end address of the control parameter. When the value output from the adder 43 is larger than the loop end address, the computing unit 44 calculates the loop top from the value output from the adder 43 so that it is included in the range from the loop top address to the loop end address. A value obtained by subtracting a multiple of the difference between the address and the loop end address is output. Such an F-number accumulator is similar to the F-number accumulator 32 in the above-described embodiment when the envelope is calculated using phase data indicating that the FACC hold is accumulated. FACC is accumulated, and FACC is not accumulated when the envelope is calculated using phase data indicating that the FACC hold is not accumulated.

  An electronic musical instrument having such an F-number accumulator can reduce the burden on the CPU when generating a musical sound to which an echo effect is added, in the same manner as the electronic musical instrument 1 in the above-described embodiment. it can.

FIG. 1 is a block diagram showing an embodiment of a musical sound generator according to the present invention. FIG. 2 is a diagram illustrating control parameters. FIG. 3 is a block diagram showing a musical tone signal generator. FIG. 4 is a block diagram showing the F number accumulator. FIG. 5 is a time chart showing the waveform of a musical sound.

Explanation of symbols

1: Electronic musical instrument 2: Bus 3: CPU
5: ROM
6: RAM
7: Keyboard section 8: Operation panel section 11: Music signal generator 12: Waveform memory 14: DSP
15: D / A converter 16: amplifier 17: speaker 30: assignment memory 31: timing generator 32: F number accumulator 33: sampling interpolation filter 34: envelope accumulator 35: first multiplier 36: first Multiplier of 2 37: Series accumulator 41: Selector 42: Gate 43: Adder 44: Calculator

Claims (6)

A CPU that calculates a control parameter indicating a start address, an F number addition value, and a plurality of envelope data in response to an operation of the input device;
An F number accumulator for accumulating the F number addition value to the start address to calculate a read address;
A read unit for reading out read waveform data corresponding to the read address from a waveform memory for recording plural waveform data in association with a plurality of addresses,
An envelope generator for adding an envelope to the musical sound based on one envelope data of the plurality of envelope data;
The plurality of envelope data corresponds to a plurality of phases that divide a period during which the musical sound is generated,
The F number accumulator does not accumulate the F number addition value when the envelope data corresponds to a predetermined phase. In claim 1,
The F number accumulator is
A selector,
An adder that adds the F number addition value and the value output by the selector and outputs the read address;
The selector outputs the start address when the envelope data corresponds to the predetermined phase, and outputs the value output by the adder when the envelope data does not correspond to the predetermined phase. . In claim 1,
The F number accumulator is
A selector,
The gate,
An adder that adds the value output by the gate and the value output by the selector and outputs the read address;
The selector outputs the start address immediately after the operation, outputs the value output by the adder after outputting the start address,
The tone generator outputs 0 when the envelope data corresponds to the predetermined phase, and outputs the F number addition value when the envelope data does not correspond to the predetermined phase. In either claim 2 or claim 3,
The control parameter is:
A first control parameter;
A second control parameter,
The phase duration indicated by the envelope envelope corresponding to the predetermined phase of the plurality of envelope data of the first control parameter is:
A musical tone generating device different from a phase duration indicated by an envelope envelope corresponding to the predetermined phase of the plurality of envelope data of the second control parameter. In claim 4,
The predetermined phase is a first phase of the plurality of phases. In claim 5,
The control parameter further indicates a loudness indicating the magnitude of the musical sound,
The loudness indicated by the first control parameter is different from the loudness indicated by the second control parameter.

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