A newly developed noise receiver is introduced, which has a wide IF bandwidth to measure the APD and CRD of impulsive noise received through nearly the same transmission bandwidth as TV signals. An APD/CRD measuring instrument, called a noise level analyzer, which can measure the APD/CRD of the impulsive noise with a frequency spectrum of this width is also introduced. Outdoor measurements are made of automobile ignition noise using this equipment, together with subjective evaluation tests of TV pictures impaired by corresponding ignition noise. The subjective annoyance level shows a very good correlation with the percentage time and the average crossing rate of the envelope-detected impulsive automobile noise, which are both derived from APD/CRD, in both cases the bandwidth of the noise is 3.5 MHz and 120 kHz. On the other hand, the quasi-peak voltage is not a proper parameter as far as the annoyance caused by automobile ignition noise in TV reception is concerned.
Relation between APD/CRD of automobile ignition noise and resultant TV picture degradation
Der Zusammenhang zwischen APD/CRD-(amplitude probability distortion)/crossing rate distribution) Stoerungen durch die Kfz-Zuendanlage und den resultierenden Fernsehbildstoerungen
1985
6 Seiten, 31 Bilder, 1 Tabelle, 2 Quellen
Conference paper
English
Automobile Ignition Noise and the Supernoisy Vehicle
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