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Editing audioDigital audio fundamentals ► Recording a sound

There are two important aspects of this measuring process. First is the sampling rate, the rate at which the computer saves measurements of the signal strength. It is a known fact of physics that you must measure, or sample, the signal at a rate at least twice that of the highest frequency you want to capture. For example, suppose you want to record a moderately high note on a violin—say the A whose fundamental frequency is 440 Hz and all overtones up to five times the fundamental. The highest frequency you want to capture is 2,200 Hz, so you need to measure the electrical signal from the microphone at least 4,400 times per second.
The other important aspect of the measuring process is the sampling resolution. The sampling resolution determines how accurately the amplitude of each sample is measured. At present, the music industry has settled on a system that provides 65,536 different values to assign to the amplitude of a waveform at any given instant. Thus, each sample saved by your computer requires 2 bytes (16 bits) to store, since it takes 2 bytes to store a number from –32,768 to 32,767. The scaling of the electrical input signal level to amplitude value is determined by your audio hardware and by the position of your input level control.
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