Chapter 4 Signal Characteristics of Audio Devices
DOI: 10.4324/9781315696331-4
A signal is a varying parameter that represents information. For example, an audio signal is usually a varying voltage in the frequency range of 20 Hz to 20 kHz that represents speech, music, sound effects, hum, or noise.
When a microphone converts sound to electricity, this electricity is called the signal. It has the same frequencies and the same amplitude changes as the incoming sound wave.
When this signal passes through an audio device, the device may alter the signal. It might change the level of some frequencies, or add unwanted sounds that are not in the original signal. Let’s look at some of these effects.
Frequency Response
Suppose you have an audio device—a ...
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