Title :
Measurement of AM to PM conversion in medium wave AM transmitter
Author :
Wakai, Kazuaki ; Moribe, Nobuyoshi ; Nasu, Yoshihiko ; Ikeda, Hiroaki ; Li, Jinzhu
Author_Institution :
Japan Broadcasting Corp., Saitama, Japan
fDate :
12/1/1990 12:00:00 AM
Abstract :
A method for measuring AM (amplitude modulation) signal distortion caused by AM to PM (phase modulation) conversion at the output of an AM radio transmitter is presented. A novel type of measuring instrument is also presented for testing the phase distortion which may occur in an AM radio transmitter when an AM modulation signal is applied. The down-converted AM signal is first divided into the inphase and orthogonal-phase components, and these signals are processed by an operational circuit to obtain phase distortion, which is the angle between the orthogonal-phase and inphase components. A phase angle of 10° or more is detected in the prototype version
Keywords :
amplitude modulation; electric distortion measurement; electronic equipment testing; phase modulation; radio broadcasting; radio transmitters; test equipment; AM radio transmitter; AM to PM conversion; inphase components; medium wave AM transmitter; orthogonal-phase components; phase angle; phase distortion; signal distortion; stereophonic broadcasting; Amplitude modulation; Circuit testing; Distortion measurement; Instruments; Phase detection; Phase distortion; Phase measurement; Phase modulation; Radio transmitters; Signal processing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
