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If certain problems are found, medical imaging, such as magnetic resonance imaging (MRI), may be performed. Other tests are suitable when tinnitus occurs with the same rhythm as the heartbeat. [ 3 ] Rarely, the sound may be heard by someone other than the patient by using a stethoscope , in which case it is known as "objective tinnitus". [ 3 ]
Without power, some models do not function as regular headphones. Any battery and additional electronics may increase the size and weight of the headphones compared to regular headphones. The noise-cancelling circuitry may reduce audio quality and add high-frequency hiss, although reducing the noise may result in higher perceived audio quality ...
The hissing of high voltage transmission lines is due to corona discharge, not magnetism. The phenomenon is also called audible magnetic noise, [ 1 ] electromagnetic acoustic noise, lamination vibration [ 2 ] or electromagnetically induced acoustic noise, [ 3 ] or more rarely, electrical noise, [ 4 ] or "coil noise", depending on the application.
Block diagram of the signal-flow for a common feedback loop [1]: 118 . Audio feedback (also known as acoustic feedback, simply as feedback) is a positive feedback situation that may occur when an acoustic path exists between an audio output (for example, a loudspeaker) and its audio input (for example, a microphone or guitar pickup).
Microphone interconnections are therefore a common application for a balanced interconnection, which allows the receiver to reject most of this induced noise. If the power amplifiers of a public address system are located at any distance from the mixing console , it is also normal to use balanced lines for the signal paths from the mixer to ...
An equalizer for professional live sound reinforcement typically has some 25 to 31 bands, for more precise control of feedback problems and equalization of room modes. Such an equalizer is called a 1/3-octave equalizer (spoken informally as " third-octave EQ") because the center frequencies of its filters are spaced one third of an octave apart ...
According to Frey, the induced sounds were described as "a buzz, clicking, hiss, or knocking, depending on several transmitter parameters, i.e., pulse width and pulse-repetition rate". By changing transmitter parameters, Frey was able to induce the "perception of severe buffeting of the head, without such apparent vestibular symptoms as ...
FM systems can enhance the use of hearing aids and overcome the effects of poor listening conditions because the signal is sent from the microphone worn by the speaker directly to the listener. [135] The prognosis has improved with the recent advancements in digital hearing aid technology, such as directional microphones, open-fit hearing aids ...