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ⓘ Multiburst. A multiburst waveform is a useful test pattern used to quickly ascertain the frequency response of a video system. The name derives from the multipl ..




Multiburst
                                     

ⓘ Multiburst

A multiburst waveform is a useful test pattern used to quickly ascertain the frequency response of a video system. The name derives from the multiple bursts of sine wave in the active video section of the waveform which are generated with increasing frequency, but identical in amplitude. The test pattern is usually input at the start of the signal chain and analysed at the end. By measuring the amplitude of each of the bursts of waveform at the end of the video chain, spot measurements of the frequency response of the system can be obtained and errors in the response quickly identified.

                                     

1. Importance of frequency response

In a video system, the frequency response needs to be as flat as possible or distortion in the picture displayed will occur. Analogue video signals contain a frequency content from 25 Hz up to around 5 MHz, and so variations in frequency responses will affect the picture in various ways, depending on whether it is high frequency > 1 MHz or low frequency (