JP2765306B2 - 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 an analysis / synthesis type sound source which analyzes and stores musical sound waveform data for each spectrum and resynthesizes the data to form a musical sound signal, and more particularly to a vibrato adding method.

[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 sound source, 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. There is also vibrato as a musical sound decoration method.
When vibrato is applied to an M-type sound source, there is a disadvantage that the modulation is monotonous because the modulation is performed by a regularly formed triangular wave or sine wave. On the other hand, if the waveform data itself contains vibrato in the waveform memory type sound source, the vibrato cannot be controlled, and when the waveform data is repeated from the middle (when looped), the consistency of the vibrato waveform deteriorates. There were drawbacks.

[0004] It is an object of the present invention to provide a tone generator having good reproducibility of the timbre of a natural musical instrument and good waveform controllability, and to enable natural vibrato performance in the tone generator. .

[0005]

According to the present invention, musical tone waveform data is divided into a plurality of partial data, spectrum frequency data and intensity data are analyzed for each partial data, and vibrato waveform data of the musical tone waveform data is analyzed. Analysis means for analyzing; storage means for storing, as analysis parameters, frequency data, intensity data and vibrato waveform data of a spectrum for each partial data analyzed by the analysis means; and sequentially reading out the analysis parameters and adding the vibrato waveform to the frequency data Combining means for adding and subtracting or multiplying the data to resynthesize the musical tone waveform data. Further, the present invention provides the vibrato wave
At least the amplitude of the shape data is changed and supplied to the synthesizing means.
A supply means.

[0006]

The sound source apparatus of the present invention extracts analysis parameters relating to the spectrum and vibrato waveform from the musical tone waveform data and stores them. When forming musical sound waveform data for pronunciation, analysis parameters are sequentially read and synthesized. The vibrato waveform data can add vibrato to the tone waveform data to be resynthesized by adding, subtracting, or multiplying the spectrum frequency data. This makes it possible to form musical tone waveform data with good reproducibility similar to that of the waveform memory, and to freely adjust the analysis parameters, thereby facilitating musical tone processing (particularly, adjustment of vibrato).

[0007]

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 analyzing section 1, a storage section 2, an interpolating section 3, a shifting section 4, and a synthesizing section 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.

[0010] 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 partial configuration diagram of a sound source device according to an embodiment of the present invention. In this sound source device, the analysis unit performs not only the analysis of the spectrum (local peak) for each of the divided N channels (128 channels) but also the analysis of the entire vibrato waveform. The storage unit 2 'stores vibrato data in addition to the frame data shown in FIG. 4 for each voice data. The vibrato waveform data is stored in a vibrato waveform data storage area 2'a of the storage unit 2 '.
Is stored in FIG. 7 is a diagram showing the configuration of the vibrato analyzing section of the analyzing section 1 'and the vibrato waveform data storage area 2'a of the storage section 2'. Vibrato analyzer 1'a
Is composed of a pitch extracting unit 10 and a subtractor 13.
The pitch extraction unit 10 has an autocorrelation circuit 11 and a maximum peak extraction circuit 12. The autocorrelation circuit 11 is a circuit for extracting a frequency variation from the immediately preceding frequency, and the maximum peak extracting circuit 12 is a circuit for extracting a local peak of the variation. The vibrato waveform can be extracted by subtracting the center pitch of the tone waveform data from the frequency fluctuation value extracted in this way. The subtraction of the center pitch is performed by the subtractor 13. The vibrato waveform thus extracted is stored in the vibrato data storage area 2'a. The vibrato waveform is stored in time series as pitch fluctuation data.

The voice data stored in the storage section 2 'is read out at the time of re-synthesizing the musical tone waveform. The frame data is read according to frame number data input from a frame counter (not shown). The vibrato waveform data is read according to the vibrato speed control data. The frame data is input to the interpolation unit 3 '. The interpolator 3 'linearly interpolates the preceding and succeeding frame data for each sampling clock and outputs the result. The vibrato waveform data is read for each sampling clock and input to the multiplier 6. The multiplier 6 multiplies the data by the vibrato depth control data. The vibrato depth control data is generated based on after touch data or modulation wheel data of a performance device such as a keyboard, for example. The vibrato waveform data multiplied by the vibrato depth control data is input to the adder 7. The adder 7 is provided for each channel between the interpolation unit 3 'and the shift unit 4, and receives the interpolated frequency data Freq of each channel. This frequency data Fre
After the vibrato waveform data (addition of frequency) is added to q, it is input to the shift unit 4. As a result, only the vibrato component of the sampled musical sound waveform data is separately stored, and the depth and speed thereof are adjusted and added at the time of re-synthesis.

The vibrato waveform data may be multiplied by the frequency data Freq. It is also possible to control the vibrato by suppressing the vibrato by subtracting the vibrato waveform data.

[0020] The vibrato waveform data is looped in an appropriate section in phase.

[0021]

As described above, according to the present invention, by using the sampled data, the reproducibility of a musical tone of a natural musical instrument or the like is good, and the waveform data is stored in the analysis parameters, so that the tone color processing is high. Can be realized. Further, by extracting and storing only the vibrato waveform, the depth / speed of the vibrato can be adjusted, and further, there is no possibility that the phase of the vibrato will be shifted even when the musical sound loops.

[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 partial detailed diagram of an analysis and synthesis system sound source according to an embodiment of the present invention.

FIG. 7 is a detailed view of the vicinity of a vibrato analysis circuit 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, 1'a-vibrato analysis unit, 2'a-vibrato waveform data storage area, 7-adder.

Claims (2)

(57) [Claims] 1. A musical tone waveform data is divided into a plurality of partial data, and spectrum frequency data is provided for each partial data.
Analyzing means for analyzing the intensity data and analyzing the vibrato waveform data of the musical tone waveform data; and storing the spectrum frequency data, intensity data and vibrato waveform data for each partial data analyzed by the analyzing means as analysis parameters. And a synthesizing unit for sequentially reading the analysis parameters and adding or subtracting or multiplying the frequency data by the vibrato waveform data to resynthesize the musical tone waveform data. 2. The method of claim 1, wherein at least one of the vibrato waveform data
Data processing means for changing the amplitude and supplying it to the synthesizing means
The sound source device according to claim 1, further comprising: