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Anti-sidetone circuitry in the telephone hybrid brought sidetone under control in the early 20th century, leaving enough feedback signal to assure the user that the telephone is working. [2] Almost all land-line (wired and wireless) telephones have employed sidetone, so it was an expected convention for cellular telephony, but is not standard.
Delayed Auditory Feedback (DAF), also called delayed sidetone, is a type of altered auditory feedback that consists of extending the time between speech and auditory perception. [1] It can consist of a device that enables a user to speak into a microphone and then hear their voice in headphones a fraction of a second later.
Sidetone: hearing one's own voice echoed in the receiver speaker; A noticeable amount of constant background noise (this is not interference from outside sources, but noise within the cordless telephone system) Frequency response not being the full frequency response available in a wired landline telephone
If the delay is fairly significant (more than a few hundred milliseconds), it is considered annoying. If the delay is very small (tens of milliseconds or less [3]), the phenomenon is called sidetone. If the delay is slightly longer, around 50 milliseconds, humans cannot hear the echo as a distinct sound, but instead hear a chorus effect. [3]
When designating anti-sidetone apparatus, the Bell System practice was to add the value 100 to the apparatus code of the corresponding sidetone equipment. [34] Thus, the new hand telephone set with the anti-side tone circuit was the type 202 hand telephone set. [17]
This profile is designed to provide a standard interface to control TVs, Hi-Fi equipment, etc. to allow a single remote control (or other device) to control all of the A/V equipment to which a user has access.
By 1930 this round base was redesigned into the elliptical-footprint D handset mounting to avoid instability of the unit when dialing. In the same period, the electric circuitry was upgraded to produce the model 202 telephone, which reduced the strong sidetone characteristic of earlier designs.
Meucci has been further credited with the invention of an anti-sidetone circuit. However, examination showed that his solution to sidetone was to maintain two separate telephone circuits and thus use twice as many transmission wires. The anti-sidetone circuit later introduced by Bell Telephone instead canceled sidetone through a feedback process.