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The sudden absence of background noise gives the near-end user the impression that the line has gone dead. In response to this, Bell Labs developed echo canceler theory in the early 1960s, [ 4 ] [ 5 ] which then resulted in laboratory echo cancelers in the late 1960s and commercial echo cancelers in the 1980s. [ 6 ]
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A digital delay line (or simply delay line, also called delay filter) is a discrete element in a digital filter, which allows a signal to be delayed by a number of samples. Delay lines are commonly used to delay audio signals feeding loudspeakers to compensate for the speed of sound in air, and to align video signals with accompanying audio ...
Can you hear me?" is a question asked in an alleged telephone scam, sometimes classified as an internet hoax. [1] There is no record of anyone having ever been defrauded in such a scam, according to the Better Business Bureau, the Federal Trade Commission, and the Consumer Federation of America. Reports of the supposed scam began circulating in ...
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One example of an analog delay line is a bucket-brigade device. [1] Other types of delay line include acoustic (usually ultrasonic), magnetostrictive, and surface acoustic wave devices. A series of resistor–capacitor circuits (RC circuits) can be cascaded to form a delay. A long transmission line can also provide a delay element. The delay ...
Busy line interrupt, also known as emergency breakthrough, is a function of telephone land line carriers in which a telephone operator, by request of a caller, interrupts an existing phone conversation between other parties. [1] This is especially useful for services without call waiting.
Example of a delay certificate issued by a Japanese railway (Sagami Railway Yokohama station).A delay certificate (Japanese: chien shōmei sho (遅延証明書), "certificate of lateness"; German: Bescheinigung über Zugverspätung, "certificate about train delay") is a documentation of proof issued by a railway company that its scheduled passenger train arrived at a station later than what is ...