michael123
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מסביר על ה-clipping ולמה זה רע
http://www.cutestudio.net/data/products/audio/CD_clipping/index.php
כמה דברים מעניינים שלא ידעתי (כי זה מכניס יותר הרמוניות אי-זוגיות)
Why digital clipping sounds so bad
Firstly digital clipping is the same as any other clipping, the only difference is that the highest clip frequency is limited to 22.05kHz on a CD, whereas analog can reach 120kHz at times.
The first audio fact you need to be aware of is that all distortion is not created equal, and within this, odd harmonics sound much worse than even ones. .
The Second audio fact is that clipping, or squaring off the waveform creates a great deal of odd harmonics.
Square waves contain all of the odd harmonics from the fundamental (depends on the length of the clip) right up to the highest frequency in the system - on a CD that is 22kHz. For instance a clip of a few points forming a fundamental of 2kHz will create a harmonic at 6kHz, 10kHz and 17kHz.
These harmonics are fleeting and vary on clipping pulse width, but they are there. When listening to a track containing hundreds of clips per second, this forms a random noise field everywhere in the sound spectrum except the lowest notes (unless they beat with other notes to form new tone products, which is quite likely).
As the sound level increases, so does the clipping, and therefore so do the odd order harmonic distortion products, dancing arond the mid and high frequencies as a mass of shifting harmonic distortion that increases steeply with volume.
http://www.cutestudio.net/data/products/audio/CD_clipping/index.php
כמה דברים מעניינים שלא ידעתי (כי זה מכניס יותר הרמוניות אי-זוגיות)
Why digital clipping sounds so bad
Firstly digital clipping is the same as any other clipping, the only difference is that the highest clip frequency is limited to 22.05kHz on a CD, whereas analog can reach 120kHz at times.
The first audio fact you need to be aware of is that all distortion is not created equal, and within this, odd harmonics sound much worse than even ones. .
The Second audio fact is that clipping, or squaring off the waveform creates a great deal of odd harmonics.
Square waves contain all of the odd harmonics from the fundamental (depends on the length of the clip) right up to the highest frequency in the system - on a CD that is 22kHz. For instance a clip of a few points forming a fundamental of 2kHz will create a harmonic at 6kHz, 10kHz and 17kHz.
These harmonics are fleeting and vary on clipping pulse width, but they are there. When listening to a track containing hundreds of clips per second, this forms a random noise field everywhere in the sound spectrum except the lowest notes (unless they beat with other notes to form new tone products, which is quite likely).
As the sound level increases, so does the clipping, and therefore so do the odd order harmonic distortion products, dancing arond the mid and high frequencies as a mass of shifting harmonic distortion that increases steeply with volume.