Audio Recording

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Audio recording, also known as sound recording and reproduction, is an electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects.[1] The two main classes of sound recording technology are analog recording and digital recording.


Analog recording is known to record audio on disk records. The basic principle of disk recording is very simple. Displacement of the microphone diaphragm is transformed into a wiggley groove on a moving piece of vinyl. A stylus tracing the wiggles exactly reproduces the motion of the diaphragm at the time the recording was made. Electricity is really incidental to the process, used as a convenient way to connect the microphone to the cutter and the pickup to the speaker.[2]


Digital recording occurs through the use of numerical data, such as binary. In a digital recording system, sound is stored and manipulated as a stream of discrete numbers, each number representing the air pressure at a particular time. The numbers are generated by a microphone connected to a circuit called an analog to digital converter, or ADC. Each number is called a sample, and the number of samples taken per second is the sample rate. Ultimately, the numbers will be converted back into sound by a digital to analog converter or DAC, connected to a loudspeaker.[3]