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Perfect Pitch: An Accurate-Pitch Sensor and Sounder
Posted March 28, 2015 by Chris
"The circuit in the picture is a sound sensor that measures both the overall strength of sound and the amount of audio energy in a specific frequency of up to 4kHz. This allows it to detect whether a tone of a particular frequency is played: it compares the audio energy in that frequency to the total amount of energy, and if the ratio is high enough, say above 1/8, it concludes that somebody is playing the tone."
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