The Design and Simulation Model of Vector Composing Circuits for Angle and Amplitude Modulations.
ABSTRACT The angle and amplitude modulations are two important modulation styles in the course “Radio Frequency Circuits” or “Communication
Circuits”. The vector composing method is introduced in the angle modulation to analyze how the angles of carriers in the
circuits of Armstrong’s PM and double-AM’s PM are modulated by signal using the vector representation. This paper discussed
the similarities and differences of vector composing of AM, DSB, Armstrong’s PM and double-AM’s PM, and proved the equivalence
of Armstrong’s PM and double-AM’s PM. Then a uniform vector composing circuit model had been built for these modulations using
their commonness. The simulation shows that this model can save the cost of implementations and is convenient for induction
analyzing, comparing with each other.
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ABSTRACT: A new method of reducing the effects of all kinds of disturbances is described. The transmitting and receiving arrangements of the system, which makes use of frequency modulation, are shown in detail. The theory of the process by which noise reduction is obtained is discussed and an account is given of the practical realization of it in transmissions during the past year from the National Broadcasting Company's experimental station on the Empire State Building in New York City to Westhampton, Long Island, and Haddonfield, New Jersey. Finally, methods of multiplexing and the results obtained in these tests are reported.06/1936; DOI:10.1109/JRPROC.1936.227383