Lyd

Sound waves
Sound starts with vibrations in the air, like those produced by guitar strings, vocal cords or speaker cones. These vibrations push nearby air molecules together, raising the air pressure slightly. The air molecules under pressure then push on the air molecules surrounding them, which push on the next set of molecules, and so on. When these waves of pressure changes reach us, they vibrate the receptors in our ears, and we hear the vibrations as sound.

Waveform measurements
- Amplitude
- Cycle
- Frequency
- Phase
- Wavelength






How sound waves interact
When tro or more sound waves meet, they add to and subtract from each other. If their peaks and troughs are perfectly in phase, they reinforce each other, resulting in av waveform that has higher amplutude than either individual waveform. If the peaks and troughs of two waveforms are perfectly out of phase, they cancel each other out, resulting in no waveform at all.

Comparing analog and digital audio
Analog audio: positive and negative voltage
A microphone converts the pressure waves of sound into voltage changes in a wire: high pressure becomes positive voltage, and low pressure becomes negative voltage.
Digital audio: zeroes and ones
Unlike analog storage media such as magnetic tape or vinyl records, computers store audio information digitally as a series of zeroes and ones. In digital storage, the original waveform is broken up into individual snapshots called samples. When you record from a microphone into a computer, for example, analog to digital converters transform the analog signal into digital samples that computers can store and process.

Understanding bit depth
Bit depth determines dynamic range. When a sound wave is sampled, each sample is assigned the amplitude value closest to the original wave's amplitude. Higher bit depth provides more possible amplitude values, producing greater dynamic range, a lower noise floor, and higher fidelity. For the best audio quality, remain at 32-bit resolution while transforming audio in Audition, and then convert to a lower bit depth for output.

Measuring amplitude in dBFS
In digital audio, amplitude is measured in decibels below full scale, or dbjs.