So what is a sound wave ?
Speech signals are sound signals, defined as pressure variations travelling through the air. These variations in pressure can be described as waves and correspondingly they are often called sound waves.
**Sound **wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed
- **Wavelength **— The minimum distance in which a sound wave repeats itself is called its wavelength. That is it is the length of one complete wave. It is denoted by a Greek letter λ
- **Amplitude **— When a wave passes through a medium, the particles of the medium get displaced temporarily from their original undisturbed positions. The maximum displacement of the particles of the medium from their original undisturbed positions, when a wave passes through the medium is called amplitude of the wave.
3. **Time Period **— The time required to produce one complete wave or cycle or cycle is called time-period of the wave.
4. **Frequency **— The number of complete waves or cycles produced in one second is called frequency of the wave. The S.I unit of frequency is hertz or Hz.
5. **Velocity **— The distance traveled by a wave in one second is called velocity of the wave or speed of the wave.
What is Windowing and Sampling in Sound Data?
Sampling the signal is a process of converting an analog signal to a digital signal by selecting a certain number of samples per second from the analog signal. Can you see what we are doing here? We are converting an audio signal to a discrete signal through sampling so that it can be stored and processed efficiently in memory.
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