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E.H. Scott Radio Laboratories is sometimes confused with H.H. Scott. E.H. Scott was founded in 1925 by Chicago resident Ernest H. Scott. Its first product was the World's Record Super 8, a TRF (tuned radio frequency) design with typical harness wiring with 16 gauge silvered solid core copper wire employed in an array configuration that was typical to radios at the time. This construction ...
Demodulation is the process of extracting the original information-bearing signal from a carrier wave.A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. [1]
Receiver manufacturers who include HD Radio pay a royalty, which is the main reason it failed to be fully-adopted as a standard feature. [14] If the HD receiver loses the primary digital signal (HD‑1), it reverts to the analog signal, thereby providing seamless operation between the newer and older transmission methods.
From 1999 to 2007, Harman Kardon worked to develop digital processing for audio products. In 1999 the company introduced the CDR-2 compact disc recorder, the first with 4X high speed dubbing. In 2000, Harman Kardon produced the AVR-7000 audio-video receiver, which was able to decode and process HDCD. Harman retired in 2007 at the age of 88.
These problems have the same cause: a regenerative receiver's gain is greatest when it operates on the verge of oscillation, and in that condition, the circuit behaves chaotically. [ 28 ] [ 29 ] [ 30 ] Simple regenerative receivers electrically couple the antenna to the detector tuned circuit, resulting in the electrical characteristics of the ...
Marantz is a company that develops and sells high-end audio products. [2] The company was founded in New York, but is now based in California. The first Marantz audio product was designed and built by Saul Marantz in his home in Kew Gardens, New York. [3]
Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.