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White light is made up of many frequencies and wavelengths. Frequency and wavelength are directly related to a color of light. The refractive index varies for each of the different wavelengths of light. This difference produces an effect called dispersion. Temas Relacionados: Light entering one medium from another will bend due to the velocity change. Refraction is the bending or changing of the direction of a light ray when passing through a material, such as water or glass. How much light refracts, meaning how great the angle of refraction, is call the refractive index. Temas Relacionados: Amplitude is the magnitude of a signal. As represented on a sine wave, it is the intensity of a wave. Temas Relacionados: Frequency is the number of cycles in a given time period. Most often, frequency is measured in Hertz (Hz). 1Hz = 1 cycle per second. Usually frequency is measured in the hertz unit. The hertz measurement, abbreviated Hz, is the number of waves that pass by per second. For example, an “A” note on a violin string vibrates at about 440 Hz (440 vibrations per second). Frequency and wavelength are inversely related. As wavelength increases, the frequency decreases. Temas Relacionados: Feedback is the “squealing” or “howling” generated between microphones and loudspeakers. Feedback occurs if a mic is too close to the front of a loudspeaker. One way to avoid feedback is through proper microphone and loudspeaker placement. The best strategy is to place microphones near the origin of the sound to be reinforced and physically as far from, and behind the loudspeakers as possible. Temas Relacionados: An audio signal is an electrical representation of a sound. The following is a typical audio signal chain: 1. The sound source creates sound wave vibrations in the air.
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