JP6400408B2 - Music generator - Google Patents

Description

  The present invention relates to a musical sound generator.

  As shown in FIG. 9, the PCM sound source performs so-called loop playback (this section is referred to as a repeated portion in this application) in which a certain section is reproduced from the rising edge of the musical sound and then the subsequent section is repeatedly read out. .

  During this loop playback (generation of musical sound by repeatedly reading out repeated parts), a change in sound may be unnaturally repeated or a sudden change in sound may be lost.

  Also, as a method of eliminating the uncomfortable feeling caused by sudden start of loop playback, as shown in FIG. 10, the sound is gradually increased at the last part of normal playback (this part is referred to as a transition part following the rising part in the present application). The method of smoothing the change of the sound, etc. is also taken.

  However, even if such a method of eliminating the sense of incongruity is implemented, the above-mentioned unnatural sound changes due to loop reproduction and the occurrence of incongruity due to the abrupt sound change cancellation still remain and are problematic.

  The present invention was devised in view of such circumstances, and by adding a new variable element after the transition portion (fade interval), it eliminates the sense of discomfort in the subsequent repeated portion. It is intended to provide a musical sound generator.

The configuration of the present invention is as follows:
A waveform memory in which musical tone waveform data composed of waveform data of a rising portion of a musical tone, a transition portion following the rising portion, and a repeating portion following the transition portion is stored, the rising portion of the musical sound, the transition portion, and A musical tone generator for generating a musical tone by repeatedly reading out the repeated portion and then repeatedly reading out the repeated portion,
The musical tone waveform data is read from the waveform memory, and the leading portion, transition portion, and repeated portion of the musical tone are read once in succession, and then the original musical tone that is repeatedly read out and generated. ,
Consists of a part of the original musical sound (part of the band extracted by controlling the level of each overtone by filtering, etc.), dynamically and statically changing the frequency to a different pitch from the original musical sound Basically, the supplementary musical tone that has been faded in (from the beginning of the transition portion of the original musical tone to the beginning of the repeated reading portion) is added and output. Features.

  According to the above configuration, the processing of the complementary musical sound is configured with a part of the band of the original musical sound corresponding thereto, and the frequency change processing is dynamically and statically changed to a pitch different from the original musical sound, and the transition part of the original musical sound is changed. Since the fade-in process is performed from the beginning to the beginning of the repeated reading part, and added to the original music sound, it is output, so the above unnatural sound changes due to loop playback of the repeated part, and the uncomfortable feeling due to sudden sound change cancellation Can be eliminated.

  For example, a part of the frequency band of the musical sound (around 2 to several harmonics of the original waveform) is taken out and detuned. This is gradually faded in along with the fade section, and finally mixed with the original musical sound. In this case, the way the timbre changes depends on the amount of detune and the balance of MIX. By setting this to produce a change larger than the loop size of the repeated part, there is no loop feeling. It becomes possible to reproduce natural musical sounds.

  The processing to narrow down to a part of the band of the original musical sound to be subjected to frequency change processing and fade-in processing performed on the complementary musical sound may be performed by using the filter processing of the sound source in addition to the band pass filter (BPF) processing. It is good, and it is performed by filter processing by DSP or the like.

  Even in such a case, the change for each harmonic can be adjusted by using a filter having a finer shape instead of the band-pass filter processing.

  Further, the characteristics of the band pass filter may be adjusted for each waveform, or may be grouped for each sound range and processed by the same band pass filter.

  Furthermore, the frequency changing process may be realized by detuned, or may be realized by specifying the pitch of a sound source, or an effect such as a pitch shifter by a DSP may be used. In addition, this frequency change process can achieve the same effect by using effect processing such as chorus instead of detune.

  On the other hand, when processing the above-mentioned filter processing to narrow down to a part of the original musical sound band, use a filter with different filter characteristics or use a different detune amount for the frequency change processing It is also possible to create an effect like a three-string piano by finally mixing it with the original musical sound.

  In addition, all of the above processing may be performed on the complementary musical tone by a DSP.

  Further, there may be a plurality of channels, the original musical sound may be generated by one of the channels, and the complementary musical sound may be generated by any one other than the above channels.

  According to the above configuration of the present invention, in addition to the above processing for the original musical sound, the complementary musical tone processing is configured with a part of the band of the original musical sound, and the frequency is dynamically and statically changed to a pitch different from the original musical sound. Processed and faded in from the beginning of the transition portion of the original musical sound to the beginning of the repeated reading portion, and the processed original musical tone and the supplemental musical tone are added and output. By setting such processing to produce a change that is larger than the loop size of the repeated portion, the above unnatural sound changes due to loop playback of the repeated portion, and the sense of incongruity caused by sudden change cancellation It is possible to achieve an excellent effect of eliminating the occurrence of.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an outline of the configuration of an electronic keyboard instrument in which the musical tone generator of the present invention is used.

  As shown in the figure, a system bus 200 includes a CPU 202, ROM 204, RAM 206, an operation panel 208 via a panel scan circuit 208a, a keyboard 210 via a keyboard scan circuit 210a, and a DCO (Digital Controlled Oscillator as will be described later). ) 212a, a tone generator 212 composed of a digitally controlled filter (DCF) 212b and a digitally controlled amplifier (DCA) 212c, and a DSP 216 used as an embodiment of the tone generator according to the present invention. Is connected. Command / data input / output to / from each unit and timing control of the input / output are performed. That is, the system bus 200 controls each circuit connected to the system bus 200 by a CPU 202 described later, and functions as an electronic keyboard instrument.

  The ROM 204 stores a program memory (not shown) for storing programs used in the CPU 202 and the DSP 216, which will be described later, and various necessary data (for example, coefficients used in the DSP 216).

  The RAM 206 temporarily stores various parameters and data generated in the control by the CPU 202.

  The electronic keyboard instrument is provided with an operation panel 208, a keyboard 210, and the like. The operation panel 208 is provided with a timbre switch for selecting a tone color of a musical tone to be generated, a switch for effect setting such as a delay, and the like. Information set from the operation panel 208 is scanned by the panel scan circuit 208a. Is detected and supplied to the CPU 202 via the system bus 200.

  The keyboard 210 includes an 88-key keyboard, and each key is provided with a keyboard sensor (not shown) including a touch sensor. The keyboard sensor detects a performance operation performed by the performer on the keyboard 210 and displays various types of performance information as key press information (including information such as key press timing (key ON) and key release timing (key OFF)). Output. The data is detected by the keyboard scan circuit 210a, and a key map KMP is created from the data. The data is supplied to the CPU 202 via the system bus 200 and sent to the sound source 212 by the CPU 202. Musical sound data is generated by reading out waveform data from the waveform memory 214 by the sound source 212.

  The CPU 202 executes the program read from the ROM 204 to control the above-described units and data input / output processing, and to control the entire circuits connected by the system bus 200 as an electronic keyboard instrument. In addition to issuing a control command to the sound source 212, a program for using the DSP 216 for the musical tone generator according to the present invention and necessary coefficient data are read from the ROM 204, sent to the DSP 216, and output from the sound source 212. Necessary musical tone generation processing is performed on the musical tone data and added thereto.

  Note that the musical sound data output from the DSP 216 is input to the D / A converter 218 and converted into an analog signal. The analog signal is output from a sound system 220 (such as an amplifier or a speaker).

  In the configuration of this embodiment, as shown in FIG. 1 and FIG. 2, it is in the sound source 212 and is branched in the sound source 212 (branched to the original music path and the complementary music path) to fade in the volume of the music. In this embodiment, a fade-in processing unit 10 composed of a multiplier and a DSP 216 that performs processing (a process of fading in gradually in accordance with a fade section (transition part)) and the fade-in processing unit 10 In this embodiment, the level of each harmonic included in the musical tone data that has been processed and output to the DSP 216 is controlled and extracted. In this embodiment, the filter processing unit 12 composed of a bandpass filter and the frequency of each harmonic included in the musical tone data are obtained. In this embodiment, a frequency change processing unit 14 configured by a detune circuit is provided, which is dynamically and statically changed. In this part (complementary musical tone path), It is generated complementary tone for Kimoto tone, (flows based on musical path) by the adder 16 is configured to output is added to the original tone.

  FIG. 3 shows the relationship between the waveform of the original musical tone and the waveform of the complementary musical tone that are respectively processed in the original musical tone path and the complementary musical tone path. As shown in FIG. 10 described above, the transitional portion of the original musical sound is a fade section, gradually reducing the movement of the sound and smoothing the change of the sound. However, in such processing based on the original musical sound path, the repetition of unnatural sound due to loop reproduction and the occurrence of a sense of incongruity due to the sudden change in sound remain as usual.

  On the other hand, as shown in the lower part of FIG. 3, in the complementary musical tone in the complementary musical tone path according to the present embodiment, the portion corresponding to the fade section of the original musical tone fades in the volume of the musical tone by the fade-in processing unit 10. In the section corresponding to the fade section and the subsequent loop reproduction section, the filter processing section 12 and the frequency change processing section 14 also perform the above-described processing by the filter processing section 12 and the frequency change processing section 14 in both sections. Filter processing that controls and extracts the level of each overtone contained in the musical tone data, and frequency change processing that dynamically and statically changes the frequency of each overtone contained in the musical tone data. The complementary musical sound is combined with the original musical sound by the adder 16 and output together. Change is to be set as produced, it is possible to eliminate the audibility of discomfort during loop playback repeated portions.

  FIG. 4 is an explanatory diagram showing a state in which only arbitrary harmonic components are extracted from the harmonic components of the branched original musical tone by the filter processing unit 12 constituted by a band pass filter. In the figure, a state is shown in which the second to fourth harmonics of the harmonic components of the original musical sound are extracted with the amplitude unchanged.

  The filter processing by the filter processing unit 12 can adjust the change for each overtone by using a filter having a finer shape instead of the bandpass filter processing. Further, the characteristics of the band pass filter may be adjusted for each waveform, or may be grouped for each sound range and processed by the same band pass filter.

  FIG. 5 is a diagram illustrating a state in which the frequency of each overtone is dynamically or statically changed with respect to the overtone component extracted in FIG. 4 by the frequency change processing unit 14 configured by a detune circuit. FIG. In the figure, a state in which the frequency of the component of the second to fourth harmonics of the original musical sound is shifted in a slightly higher direction is shown. This frequency shift can be executed without changing in time, and each overtone can be shifted in the same frequency direction or in different directions depending on the time.

  The frequency change processing by the frequency change processing unit 14 may be performed by a detune circuit, or an effect such as a pitch shifter by a DSP may be used. May be. In addition, this frequency change process can achieve the same effect even if effect processing such as chorus is used instead of the detune circuit.

  Using a filter with different characteristics for the above filter processing, or using a different detune amount for frequency change processing, adding a path and finally mixing it with the original musical sound, it looks like a three-string piano. It is also possible to produce a special effect.

  FIG. 6 is not a bandpass filter as shown in FIG. 5 but a filter in which the above-described filter processing is performed with a filter that can set which range of harmonic components is extracted and in which amplitude range when extracted. It is explanatory drawing which shows a state.

  In the configuration of the present embodiment described above, fade-in processing is performed at the transition portion of the original musical tone for the processing of the complementary musical tone after the transition portion after the rising portion of the musical tone is read on the route other than the original musical tone route (complementary musical tone route). The original musical sound is composed of a part of the band, the frequency is dynamically and statically changed to a pitch different from the original musical sound, and the processed original musical sound and the complementary musical sound are added and output. Therefore, for such processing after the transition part, by setting so as to produce a change larger than the loop size of the repeated part, it is possible to repeat unnatural sound changes due to loop playback of the repeated part. This makes it possible to eliminate the uncomfortable feeling caused by the sudden change in sound.

  FIG. 7 is a functional block diagram showing a second embodiment configuration showing an example in which the configuration of the tone generator of the present invention is provided on the sound source 212 side instead of the DSP 216.

  As shown in the figure, in the configuration of the second embodiment, the waveform memory 214 used for the sound source 212 in FIG. The stored waveform is stored in the waveform memory 214. Therefore, in this configuration, the original musical sound waveform and the waveform obtained by filtering the original musical sound are separately stored in the waveform memory 214, and are divided into the original musical sound channel and the complementary musical sound channel, respectively, and the DCO 212a, DCF 212b, and In the DCA 212c, the original musical tone data and the complementary musical tone data are generated.

  In the DCO 212a on the complementary music channel side, the pitch (frequency) is shifted (frequency changing process), the timbre control is performed in the DCF 212b, and the fade-in process and the subsequent volume control process are performed in the DCA 212c. As described above, since the original musical sound is preliminarily filtered as the complementary musical sound waveform, there is no configuration for performing the filtering of the present invention on the DCO 212a, DCF 212b, and DCA 212c sides.

  In the above configuration, in addition to the above processing for the original musical tone, the complementary musical tone processing is configured with a part of the original musical tone band (previously filtered and stored in the waveform memory 214 side), and is different from the original musical tone. Frequency change processing is dynamically and statically changed to the pitch, fade-in processing is performed from the beginning of the transition part of the original musical sound to the start of the repeated reading part, and these processed original musical sound and complementary musical sound are added and output. Therefore, for example, by setting such processing after the transition part to generate a change larger than the loop size of the repeated part, unnatural sound changes due to loop reproduction of the repeated part. Occurrence of discomfort due to repeated or sudden change in sound can be eliminated.

  FIG. 8 is a functional block diagram showing a third embodiment configuration showing another example in which the configuration of the tone generator of the present invention is provided not on the DSP 216 but on the sound source 212 side.

  As shown in the figure, in the configuration of the third embodiment, only the original musical sound waveform is stored in the waveform memory 214 used in the sound source 212 of FIG. 1, and from there, the original musical sound channel and the complementary musical sound channel are separately provided. In the DCO 212a, the DCF 212b, and the DCA 212c, the original musical tone data and the complementary musical tone data are respectively generated.

  The DCO 212a on the complementary music channel side shifts the pitch (frequency) (frequency change processing), the DCF 212b extracts overtones of a specific band of the original music and performs tone control, and the DCA 212c performs fade-in processing and thereafter The volume control process is performed. As described above, in the present embodiment, unlike the second embodiment, the filtering process is performed in the DCF 212b of the complementary musical tone channel.

  In this way, only the original musical sound waveform is stored in the waveform memory 214. In addition to the processing on the normal original musical sound channel side, the frequency change processing is performed in the DCO 212a on the complementary musical sound channel side, and in the DCF 212b. Overtones of a specific band of the original musical sound are extracted (filter processing), and the DCA 212c performs fade-in processing to generate complementary musical sound data, which is finally generated on the original musical sound channel side. It is synthesized with the original musical sound waveform and output.

  In the above configuration, in addition to the above processing for the original musical sound, a filtering process for extracting the original musical sound into a part of the band is performed for the processing of the complementary musical sound, and the dynamic and static frequencies are different from the original musical sound. The change process is performed, and the fade-in process is performed from the start of the transition part of the original musical sound to the start of the repeated reading part, and these processed original music and complementary musical sound are added and output, for example, By setting this process after the transition part to produce a change larger than the loop size of the repeated part, it is possible to repeat unnatural sound changes due to loop playback of the repeated part, or suddenly It is possible to eliminate the occurrence of a sense of incongruity due to the elimination of the change in.

  As described in detail above, the three embodiment configurations are only for explaining a part of the configuration of the present invention, and the musical sound generating device of the present invention is not limited to the above-described illustrated examples. Of course, various modifications can be made without departing from the scope of the present invention.

  The musical sound generating apparatus of the present invention is not applied only to an electronic keyboard instrument, and can be used as long as it can generate musical sounds using a PCM type sound source.

It is a block diagram which shows the outline of a structure of the electronic keyboard musical instrument in which the musical tone generator of this invention was used. 3 is a functional block diagram illustrating a configuration of Embodiment 1. FIG. It is waveform explanatory drawing which shows the relationship between the waveform of the original musical sound processed by the original musical sound path | route and a complementary musical sound path | route, respectively, and the waveform of a complementary musical sound. It is explanatory drawing which shows the state which is performing the process which takes out only arbitrary harmonic components from the harmonic component of the branched original musical sound by the filter process part 12 comprised with a band pass filter. FIG. 5 is an explanatory diagram showing a state in which the frequency of each overtone is dynamically and statically changed with respect to the overtone component extracted in FIG. 4 by the frequency change processing unit configured by a detune circuit. It is explanatory drawing which shows the state at the time of performing the said filter process with the filter which can set not what is a band pass filter but which range of harmonic component is extracted, and how much amplitude range is extracted when extracting. It is a functional block diagram which shows the 2nd Example structure which shows an example in case the structure of the musical tone generator of this invention is provided in the sound source 212 side instead of DSP216. Similarly, not the DSP 216 but a functional block diagram showing a third embodiment configuration showing another example in which the configuration of the tone generator of the present invention is provided on the sound source 212 side. FIG. 6 is a waveform explanatory diagram showing a state in which so-called loop reproduction is performed in which a PCM sound source reproduces a certain section from the rising edge of a musical sound and then repeatedly reads the subsequent section. It is an explanatory diagram that explains how to eliminate the sense of discomfort caused by sudden start of loop playback by gradually reducing the movement of the sound at the end of normal playback and smoothing the sound change. is there.

DESCRIPTION OF SYMBOLS 10 Fade in process part 12 Filter process part 14 Frequency change process part 16 Adder 200 System bus 202 CPU
204 ROM
206 RAM
208 Operation Panel 208a Panel Scan Circuit 210 Keyboard 210a Keyboard Scan Circuit 212 Sound Source 212a DCO
212b DCF
212c DCA
214 Waveform memory 216 DSP
218 D / A Converter 220 Sound System

Claims (3)

A waveform memory in which musical tone waveform data composed of waveform data of a rising portion of a musical tone, a transition portion following the rising portion, and a repeating portion following the transition portion is stored, the rising portion of the musical sound, the transition portion, and A musical tone generator for generating a musical tone by repeatedly reading out the repeated portion and then repeatedly reading out the repeated portion,
The musical tone waveform data is read from the waveform memory, and the leading portion, transition portion, and repeated portion of the musical tone are read once in succession, and then the original musical tone that is repeatedly read out and generated. ,
Complement that is composed of a part of the band of the original musical sound, is dynamically and statically changed to a pitch different from the original musical sound, and is faded in from the beginning of the transition part of the original musical sound to the beginning of the repeated reading part A musical sound generating device characterized in that a musical sound is added and output.   2. The musical tone generator according to claim 1, wherein the complementary musical tone is processed by a DSP.   2. The musical tone generator according to claim 1, wherein there are a plurality of channels, the original musical tone is generated in one of the channels, and the complementary musical tone is generated in any one of the channels other than the channel.

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