JP2990897B2 - Sound source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for forming a sustained sound in an analysis-synthesis sound source.

[0002]

2. Description of the Related Art Various tone signal forming methods for electronic musical instruments have been conventionally proposed. The main one is FM
There are a system sound source and a waveform memory system sound source. The FM system sound source is a system in which a plurality of basic signals are synthesized (frequency-modulated) by various algorithms and intensities to form musical sound waveform data.
The waveform memory system is a system in which musical sounds of natural musical instruments are stored in a memory in time series, and when sound is generated, these are sequentially read out to form musical sound waveform data.

[0003]

In the FM system tone generator, the waveform can be controlled flexibly and flexibly by adjusting the parameters. However, it is difficult to control the waveform to the intended tone and the reproducibility of a natural musical instrument is poor. Was. The sound source of the waveform memory system has good reproducibility of musical tones of natural musical instruments, but it is difficult to process the waveform, so that it is not possible to change the timbre. Further, there is a disadvantage that unnaturalness remains when transferring by legato.

[0004] It is an object of the present invention to provide a sound source device having good reproducibility of the tone of a natural musical instrument and good controllability of a waveform, and to enable smooth legato performance in the sound source device. .

[0005]

SUMMARY OF THE INVENTION The present invention relates to an analyzing means for dividing musical tone waveform data into a plurality of partial data and analyzing the frequency and intensity of a spectrum for each partial data;
A sound source apparatus comprising: storage means for storing, as analysis parameters, the spectrum frequency and intensity of each partial data analyzed by the analysis means; and synthesis means for sequentially reading the analysis parameters and resynthesizing the musical tone waveform data.
The tone to be re-synthesized by the synthesizing means is shifted from the first tone to the
The frequency input to the synthesizing means when shifting to the tone 2
Data from the frequency of the first tone to the frequency of the second tone
Frequency shifting means for shifting smoothly, and the synthesizing means
The tone to be re-synthesized from the first tone to the second tone
The sound volume of the musical tone waveform data re-synthesized by the synthesizing means
From the volume of the first musical tone to the volume of the second musical tone
And the volume is temporarily diped near the middle
Volume control means .

[0006]

According to the sound source apparatus of the present invention, analysis parameters relating to a spectrum are extracted from musical tone waveform data and stored. When forming musical sound waveform data for pronunciation, analysis parameters are sequentially read and synthesized. As a result, it is possible to form tone waveform data with good reproducibility similar to the waveform memory. Moreover, since the analysis parameters can be freely adjusted, the processing of the musical tone is easy.

Further, according to the present invention, the musical sound to be synthesized is
When transitioning from the first tone to the second tone, the frequency data
From the frequency of the first musical tone to the frequency of the second musical tone smoothly . This enables legato performance.
In addition, since the shift is at the analysis parameter level, it is smooth without any unnaturalness compared to the shift of the musical tone waveform data itself. At this time , the volume also changes smoothly,
The volume near the interval is once dip
The volume of the musical sound during the frequency shift can be reduced,
The feeling of instability of the wave number can be eliminated.

[0008]

FIG. 1 is a block diagram of a basic circuit of an analysis and synthesis system sound source to which the present invention is applied.

This sound source has an analysis unit 1, a storage unit 2, an interpolation unit 3, a shift unit 4, and a synthesis unit 5. FIG. 2 shows the configuration of the analysis unit 1. The analysis unit 1 has a configuration in which a plurality (128) of band-pass filters (BPFs) are connected in parallel. The bandwidth of each BPF is 125 Hz, and the filtration band is arranged in order from 0 Hz to 16 kHz. Each BPF is identified by a channel number of channels 0 to 127. Further, the BPF has an FFT function, and can detect frequency data and intensity data Mag of a spectrum passing through the BPF. The frequency is detected as a deviation from the band center frequency. By adding the deviation to the band center frequency, frequency data Freq of an absolute value is obtained. The analysis unit 1 can be configured using a BPF array as described above, or can be realized using a high-speed FFT analyzer. Further, the number of channels is not limited to 128, and the bandwidth is not limited to 125 Hz.

The PCM waveform data is input to the analyzer 1. The PCM waveform data is sampled with a sampling clock of 32 kHz. The analysis unit 1 handles continuous 2048 samples as one set of data (one frame). However, each frame overlaps with a shift of 64 samples (see FIG. 3). Each channel of the analysis unit 1 receives frequency data Fre of that frame when one frame of sampling data is input.
q and intensity data Mag are output. Here, the number of samples forming one frame is not limited to 2048, and the frame interval is not limited to 64 samples.

[0011] The storage unit 2, the frequency data F ^m _n and intensity data M ^m _n of each channel are stored as a table for each frame (Fig. 4). A group of tables of a plurality of frames corresponding to one waveform data is called voice data. This voice data is stored for each tone. In the case of multi-sampling (a method of storing a plurality of waveforms of one timbre for each tone range or intensity), one timbre includes a plurality of voice data.

The analysis of the waveform data (converted into voice data) by the analysis unit 1 and the storage in the storage unit 2 are preprocessing performed before the performance.

The interpolation section 3 is a circuit section for forming data of each sampling clock when reading voice data and forming waveform data. That is, although the frame data is output every 64 clocks, 6 frames between each frame are output.
Frequency data and intensity data at three sampling timings are calculated by linear interpolation from the frame data before and after that (see FIG. 5). The interpolation is performed using the same channel data for each channel. The calculated data is output to the shift unit 4.

The shift section 4 is a circuit for shifting only frequency data in order to generate a musical tone having a pitch (frequency) designated by a keyboard or the like. The shift amount is determined based on the frequency of the sampled waveform data and the designated frequency. Note that this shift processing becomes unnecessary when voice data corresponding to all keys (pitches) is stored by multi-sampling.

The synthesizing section 5 is a circuit for synthesizing frequency data and intensity data for each channel to synthesize one waveform data. The synthesis may use an inverse FFT synthesis or an addition synthesis.

The voice data stored in the storage section 2 is read out, interpolated and shifted for each channel, and then synthesized to form musical tone waveform data.
Therefore, the operations of the storage unit 2, the interpolation unit 3, the shift unit 4, and the synthesis unit 5 are real-time operations during performance.

The analysis / synthesis sound source of the above-described method can form an electronic sound by sampling an actual sound such as a natural musical instrument, and can greatly process the sampled waveform data.

FIG. 6 is a detailed diagram of a sound source device according to an embodiment of the present invention. When a tone transition by legato is instructed by this sound source device, smooth pitch information is sent to the shift unit 4 'to shift the pitch, and the volume is changed in accordance with the pitch shift.

The shift section 4 'receives pitch information via a selector 12. The shift unit 4 'shifts the frequency data among the analysis parameters input from the interpolation unit 3 so as to have a designated frequency (pitch). To one input terminal of the selector 12, pitch information is directly input from a playing device (not shown), and to the other input terminal, pitch information is input via the adder 11. The latch circuit 10 and the multiplier 14 are connected to the adder 11. When the legato detection signal is input, the latch circuit 10
The pitch information of the tone specified immediately before is stored. The difference (pitch difference data) between the pitch information of the immediately preceding musical tone and the pitch information of the new musical tone via the subtractor 13 to the multiplier
Is entered. The multiplier 14 is connected to a legato pitch EG memory 15. The legato pitch EG memory 15 outputs legato pitch EG data as shown in FIG. 7 when a legato detection signal is input.

After the EG data is multiplied by the pitch difference data, the adder 11 adds the EG data to the immediately preceding pitch information. Since the legato pitch EG data is a smooth curve as shown in FIG. 7, the pitch transition is performed smoothly. Note that various functions such as linear or exponential functions can be applied to the transition curve.

The legato detection signal is output, for example, when the transition of the keys to be turned on on the keyboard is performed in an overlapped manner, or when a key operation is performed with the wind instrument type controller being breath-on.

Further, in this sound source device, a multiplier 20 is provided at a stage subsequent to the synthesizing section 5, and the tone waveform data synthesized by the synthesizing section 5 is multiplied by the legato volume EG data. The multiplier 20 is connected to a legato volume EG memory 21. The legato volume EG memory 21 outputs legato volume EG data when a legato detection signal is input. The legato volume EG data has a waveform having a dip as shown in FIG. 8, and the volume at the intermediate pitch is reduced in accordance with the transition of the pitch.

As a result, it is possible to eliminate the feeling of pitch instability.

As described above, according to the present invention, a tone generator having high reproducibility of a musical tone of a natural musical instrument or the like by using sampled data and storing waveform data with analysis parameters and having high processability of timbre is realized. can do. In addition, the frequency data can be shifted smoothly to
When performing a performance, the volume
Dip can eliminate frequency instability
Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an analysis and synthesis system sound source to which the present invention is applied.

FIG. 2 is a diagram showing a configuration of an analysis unit of the analysis and synthesis system sound source.

FIG. 3 is a diagram showing an example of PCM waveform data input to the analysis and synthesis system sound source.

FIG. 4 is a diagram showing storage contents of a storage unit of the analysis and synthesis system sound source.

FIG. 5 is a view for explaining the operation of the interpolation unit of the analysis / synthesis system sound source.

FIG. 6 is a detailed diagram of an analysis and synthesis system sound source according to an embodiment of the present invention.

FIG. 7 is a diagram showing pitch EG data for legato of the analysis and synthesis system sound source.

FIG. 8 is a diagram showing legato volume EG data of the analysis and synthesis system sound source.

[Explanation of symbols]

1-analysis unit, 2-storage unit, 3-interpolation unit, 4-shift unit,
5-synthesis unit, 15-legato pitch EG memory, 21
-Volume EG memory for legato.

Claims (1)

(57) [Claims] An analyzing means for dividing musical tone waveform data into a plurality of partial data and analyzing the frequency and intensity of a spectrum for each partial data, and analyzing the spectral frequency and intensity for each partial data analyzed by the analyzing means. A sound source device comprising: storage means for storing parameters as parameters; and synthesizing means for sequentially reading out the analysis parameters and resynthesizing a musical tone , wherein the musical tone resynthesized by the synthesizing means is converted from a first musical tone to a second musical tone.
When shifting to a musical tone, the frequency data input to the synthesizing means
Data from the frequency of the first tone to the frequency of the second tone.
A frequency shifting means for shifting the tone easily, and a musical tone to be re-synthesized by the synthesizing means , wherein
When shifting to a musical sound, the musical sound wave re-synthesized by the synthesizing means
The volume of the shape data is changed from the volume of the first tone to the volume of the second tone.
At the same time as shifting to the volume,
A sound source device comprising: a sound volume control unit for dipping .