What is Synthesis? (1)
What is Synthesis?
It refers to a method of processing or synthesizing the tone in a synthesizer, and a device that performs this function is called a synthesizer. Each manufacturer adopts a unique method of synthesis, but based on its principle, synthesis can be classified into four major categories.
1. Additive Synthesis
2. Subtractive Synthesis
3. PCM (Pulse Code Modulation) Synthesis
4. Other Synthesis methods
The sound source of the Additive Synthesis and Subtractive Synthesis is generally an oscillator. The waveforms from the oscillator are synthesized to create a new sound, whether type of synthesizer is analog or digital.
Depending on the instrument, the sound waves from the oscillator are different, but they are basically simple basic waves such as sine waves, square waves, and pulse waves. Depending on Synthesis, the complexity of the waveform is different, which generally creates more complex waves in the synthesizer of subtractive synthesis.
FM (Frequency Modulation) synthesizer is a typical instrument using Addictive Synthesis. The FM synthesizer combines simple basic waves to form complex waves, which generally seem difficult to use, but the basic principles are simple. However, it is often confusing to understand the algorithm of the combination method of simple basic waves.
Sometimes you can see a synthesizer that partially adopts the ring moderation or uses it as a modified synthesis. Ring Modulation is also a kind of Additive Synthesis that synthesizes the non-harmonic partial. AM (Amplitude Modulation) is also a form of creating a new partial on the spectrum, which is also an Additive Synthesis.
Subtractive Synthesis changes the partial structure of the wave depending on where you focus on the filter. It is a subtractive synthesis that is usually used to process a wave that contains all the multiple parts of partial. In analog synthesizers, subtractive synthesis is a way to remove a specific partial and pass the rest to create a desired partial configuration. Therefore, subtractive synthesis is closely related to the filter and is used as an indispensable element in today's synthesizer. As the digital filter becomes more powerful and more functional, it also performs the function of partial equalizer in addition and depreciation as the modified form of Subtractive.
The advent of electronic musical instruments basically reveals that all the foundations of acoustic instruments are already recognized and pursued new things, so inevitably they bring about the reproduction of acoustic instruments by electronic instruments. I would like to make sounds such as piano, trumpet, harmonica with electronic musical instruments, synthesizers, but the limit is so clear as the conventional analog synthesizer. Even if I tried additive synthesizers to reproduce acoustic instruments, this method only confirmed the basic proposition that all sounds by the combination of simple waveforms can possibly produce real acoustic instruments but this have not been proved. In this situation, a PCM-based synthesizer appears, which is based on generation of sounds by means of a moderate pitch playing of a digitally recorded sounds, which is the emergence of a synthesizer without an oscillator. This makes it possible for most synthesizers today to be based on PCM.
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