Recording microphone
Increasing demands for realistic audio reproduction from consumers and music professionals require multichannel sound to be recorded at high quality. Numerous microphone techniques, mixing techniques, and playback formats have been used for good perceived sound-field reproduction. Microphones are the most important link in the sound reproduction chain due to their proximity to the original sound source and their natural susceptibility to vibrations. The main goal of soundfield reproduction is to reconstruct the spatial, temporal and qualitative aspects of a particular venue as faithfully as possible when playing back in the consumer's listening room. In an ideal sound reproducing system acoustical volume current corresponds to electrical signal current. The velocity imparted to the air molecules at the surface of the speaker cone is directly proportional to the pressure that existed at the recording microphone. During recording, microphone picks up sounds and generates an analog input signal representing the sounds. Amplifier amplifies the input analog signal. The maximum level of the input analog signal depends on the sound level at microphone, and amplifier includes an automatic gain control (AGC) or automatic level control (ALC) circuit that adjusts amplifier to amplify the input signal to an appropriate level for converter. The converter converts the amplified input signal to values that write circuitry stores in memory array. Stereo sound is recorded with two microphones several feet apart separated by empty space. When stereo sound is played back to a listener, the recording from one microphone goes in the left ear and the recording from the other microphone goes in the right ear. Binaural sound recordings are recorded in a manner that more closely resembles the human acoustic system. Binaural recordings are made with microphones embedded in a model human head. 3D sound recordings are made with microphones in the ears of an actual person.
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