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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).
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.
Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a ...
The sounds we hear in our digital lives often contain more information than we think. Amazon's lead sound designer tells us the process behind the Echo's notifications
Featured in: The best smart speakers for seniors in 2024 The Echo Show 8 is like a smart speaker with a touchscreen. You can command it by saying "Alexa," like any other Echo device, but it will ...
When a commentator, announcer, or MC for a public event may otherwise be able to hear their own voice in the delayed output from the loudspeakers, they may opt to use a headset which provides instant sidetone of their own voice, thus removing the distracting effect of greatly delayed auditory feedback from the loudspeakers.
Alexa-powered Echo devices can also make phone calls, either to numbers in your contact list (which can be imported into the Alexa app) or any number you ask Alexa to dial. One exception: 911.
Other techniques may be used as well, such as using a directional primary mic, to maximize the difference between the two signals and make the cancellation easier to do. The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone.