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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.
The device, embedded in a carved wooden plaque of the Great Seal of the United States, was used by the Soviet government to spy on the US. On August 4, 1945, several weeks before the end of World War II , a delegation from the Young Pioneer Organization of the Soviet Union presented the bugged carving to Ambassador Harriman, as a "gesture of ...
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.
In 2019, the ITU published standard ITU-T H.871 [50] called "Safe listening guidelines for personal sound amplifiers". This standard recommends that PSAPs measure the weekly sound dose and adhere to a weekly maximum of less than 80 dBA for 40 hours. PSAPs that cannot measure weekly sound dose should limit the maximum output of the device to 95 dBA.
Wire recording, also known as magnetic wire recording, was the first magnetic recording technology, an analog type of audio storage. It recorded sound signals on a thin steel wire using varying levels of magnetization. [1] [2] The first crude magnetic recorder was invented in 1898 by Valdemar Poulsen. The first magnetic recorder to be made ...
Examples of a US-made set, the CDS-501, were captured in Cuba and are thought to have seen use in Central and Eastern Europe.The device operated in the upper part of the VHF band and sent high speed bursts of encrypted data from an agent to a receiving station located within a Western diplomatic facility in a hostile country to avoid interception by the adversary signals intelligence service.