JPH05119782A - Sound source device - Google Patents

Abstract

PURPOSE:To provide the sound source device which reproduces the musical sound of a natural musical instrument with good reproducibility and facilitates waveform processing. CONSTITUTION:Waveform data are analyzed for each fixed frequency (spectrum) and the analyzed data are stored in a storage part 2'; when a musical sound signal is synthesized, the analyzed data are put together. The analyzed data are good in processability and sampling data are usable for the analysis to synthesis of the waveform data. Further, only vibrato waveform data are separately extracted and stored and then only vibratos can be processed and added to the musical sound waveform.

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 tone waveform data for each spectrum and re-synthesizes it to form a musical tone signal, and more particularly to a vibrato addition method thereof.

[0002]

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

[0003]

With the FM sound source, the waveform can be flexibly controlled in various ways by adjusting the parameters, but it is difficult to control the waveform to the intended tone color, and the reproducibility of a natural musical instrument is poor. It was Further, the sound source of the waveform memory system has good reproducibility of the musical tone of the natural musical instrument, but it is difficult to process the waveform, and the tone color cannot be changed. There is vibrato as a method of decorating musical sounds, but F
When vibrato is applied with an M-system sound source, there is a drawback that it is monotonous because it is modulated by a triangular wave or sine wave that is regularly formed. On the other hand, if the waveform data itself contains vibrato in the waveform memory type sound source, vibrato cannot be controlled, and if the waveform data is repeated from the middle (looped), the consistency of the vibrato waveform will deteriorate. There was a flaw.

An object of the present invention is to provide a sound source device which has good reproducibility of the tone color of a natural musical instrument and good controllability of the waveform, and to enable natural vibrato performance in the sound source device. .

[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 the vibrato waveform data of the musical tone waveform data is analyzed. Analyzing means for analyzing, storage means for storing the frequency data, intensity data and vibrato waveform data of the spectrum for each partial data analyzed by the analyzing means as analysis parameters, and the analysis parameters are sequentially read out and the vibrato waveform is added to the frequency data. A synthesizing unit for resynthesizing the musical tone waveform data by adding or subtracting or multiplying the frequency component of the data.

[0006]

The sound source device of the present invention extracts the analysis parameters regarding the spectrum and the vibrato waveform from the tone waveform data and stores them. When forming musical tone waveform data for sound generation, analysis parameters are sequentially read and synthesized. The vibrato waveform data can add vibrato to the musical tone waveform data to be re-synthesized by adding / subtracting or multiplying the frequency data of the spectrum. As a result, musical tone waveform data with good reproducibility similar to that of the waveform memory can be formed, and analysis parameters can be adjusted freely, so that processing of musical sounds (particularly vibrato adjustment) is easy.

[0007]

1 is a block diagram of a basic circuit of an analysis and synthesis type 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 bandpass filters (BPF) are connected in parallel. The bandwidth of each BPF is 125 Hz, and its filtering band is arranged in order from 0 Hz to 16 kHz. Each BPF is identified by a channel number of 0 to 127 channels. Further, this 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 this deviation to the band center frequency, the absolute frequency data Freq is obtained. The analysis unit 1 can be configured by the BPF array as described above, or can be realized by using a high-speed FFT analyzer. Furthermore, the number of channels is not limited to 128, and the bandwidth is not limited to 125 Hz.

PCM waveform data is input to the analysis unit 1. The PCM waveform data is sampled with a sampling clock of 32 kHz. The analysis unit 1 handles consecutive 2048 samples as one set of data (one frame). However, each frame overlaps with a shift of 64 samples (see FIG. 3). When the sampling data for one frame is input to each channel of the analysis unit 1, the frequency data Fre of the frame 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.

The storage unit 2 stores the frequency data F ^m _n and intensity data M ^m _n of each channel in a table for each frame (FIG. 4). A table group of a plurality of frames corresponding to one waveform data is called voice data. This voice data is stored corresponding to each tone color. In the case of multi-sampling (a method of storing a plurality of waveforms of one tone color for each tone range and intensity), one tone color includes a plurality of voice data.

The above-described analysis of the waveform data by the analysis unit 1 (converting to voice data) and storage in the storage unit 2 are preprocessing performed before the performance.

The interpolation section 3 is a circuit section that forms data of each sampling clock when voice data is read and waveform data is formed. 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 linearly interpolating the frame data before and after that (see FIG. 5). Interpolation is performed using the same channel data for each channel. The calculated data is output to the shift unit 4.

The shift unit 4 is a circuit that shifts 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. If the voice data corresponding to all the keys (pitch) is included by the multi-sampling, this shift process is unnecessary.

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

The tone data is formed by reading the voice data stored in the storage unit 2, interpolating and shifting for each channel, and then synthesizing the voice data.
Therefore, the operations of the storage section 2-interpolation section 3-shift section 4-synthesis section 5 are real-time operations during performance.

The analysis-synthesis sound source of the above system is capable of sampling an actual sound such as a natural musical instrument to form an electronic sound, and significantly processing the sampled waveform data.

FIG. 6 is a partial block diagram of a sound source device according to an embodiment of the present invention. In this sound source device, the analysis unit not only analyzes the spectrum (local peak) of each of the divided N channels (128 channels) but also analyzes 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 the vibrato waveform data storage area 2'a of the storage unit 2 '.
Remembered in. FIG. 7 is a diagram showing the configuration of the vibrato analysis unit of the analysis unit 1'and the vibrato waveform data storage area 2'a of the storage unit 2 '. Vibrato analysis unit 1'a
Is composed of a pitch extraction 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 that extracts a frequency fluctuation from the immediately preceding frequency, and the maximum peak extraction circuit 12 is a circuit that extracts a local peak of the fluctuation. A vibrato waveform can be extracted by subtracting the center pitch of the musical tone waveform data from the frequency fluctuation value thus extracted. The subtracter 13 subtracts the center pitch. 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 variation data.

The voice data thus stored in the storage unit 2'is read out when the musical tone waveform is resynthesized. The frame data is read according to the 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 frame data before and after each sampling clock and outputs the frame data. The vibrato waveform data is read every sampling clock and input to the multiplier 6. In the multiplier 6, the vibrato depth control data is multiplied. The vibrato depth control data is generated based on, for example, aftertouch data of a musical instrument such as a keyboard or modulation wheel data. 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 the interpolated frequency data Freq of each channel is input. This frequency data Fre
The vibrato waveform data (frequency addition) is added to q and then input to the shift unit 4. As a result, only the vibrato component of the sampled musical tone waveform data is separately stored, and the depth and speed of the vibrato component are adjusted and added during recomposition.

The vibrato waveform data may be multiplied by the frequency data Freq. It is also possible to perform control so as to suppress the vibrato by subtracting the vibrato waveform data.

The vibrato waveform data is adapted to be looped in an appropriate section in phase.

[0021]

As described above, according to the present invention, since the sampled data is used, the reproducibility of the musical sound of the natural musical instrument is good, and the waveform data is stored in the analysis parameter, so that the tone generator has a high processability of the timbre. Can be realized. Further, by extracting and storing only the vibrato waveform, the depth / speed of the vibrato can be adjusted, and even if a musical sound loops, the phase of the vibrato does not shift.

[Brief description of 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 / synthesis sound source.

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

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

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

FIG. 6 is a partial detailed view of an analysis / synthesis sound source according to an embodiment of the present invention.

FIG. 7 is a detailed diagram around the vibrato analysis circuit of the analysis and synthesis sound source.

[Explanation of symbols]

1-analyzer, 2-memory, 3-interpolator, 4-shift,
5-Synthesis unit, 1'a-Vibrato analysis unit, 2'a-Vibrato waveform data storage area, 7-Adder.

Claims (1)

[Claims] 1. The musical tone waveform data is divided into a plurality of partial data, and spectrum data of each partial data,
Analyzing means for analyzing the intensity data and for analyzing the vibrato waveform data of the musical tone waveform data, and a memory for storing frequency data, intensity data and vibrato waveform data of the spectrum for each partial data analyzed by the analyzing means as analysis parameters. A sound source device comprising: means for sequentially reading out the analysis parameters; and a synthesizer for re-synthesizing the tone waveform data by adding or subtracting or multiplying the frequency component of the vibrato waveform data to the frequency data.