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The amplifier (an electronic circuit) increases the amplitude of the electric signal using a power source (battery). The speaker converts the amplified electric signal back into a sound wave. The volume (gain) control is used to adjust the amount of amplification applied to the electric signal and thus, indirectly, controls the sound volume.
In sound technology, personal sound refers to a range of software solutions that customize an audio device's sound output to match the listener's unique hearing sensitivities. [1] The technologies aim to optimize the sound quality in the audio device to ensure they best fit the hearing perception of each unique listener.
The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman , the United States Ambassador to the Soviet Union , on August 4, 1945.
The Great Seal bug was hidden in a copy of the Great Seal of the United States, presented by the Soviet Union to the United States ambassador in Moscow in 1946 and only discovered in 1952. The bug was unusual in that it had no power source or active components, making it much harder to detect—it was a new type of device, called a passive ...
Wachner co-wrote a paper for the Audio Engineering Society (AES) in 1975, addressing the problem of differing power claims in the amplifier industry and the hope that power rating standards set by the Federal Trade Commission would narrow the 'credibility gap'. [1] BGW introduced an audio crossover product in 1979 and new amplifier lines in '80 ...
The Armstrong 521 was a stereo hi-fi amplifier from the Armstrong Audio company and was marketed as 2 x 25W amplifier.. It employed germanium AL102 transistors in its output stages and these had a reputation for failure and are now unobtainable although it is possible, with modification to replace these with newer, silicon transistors.