Multiburst generator

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< Micro-D/Pascal/Avr ~ Multiburst generator

eric

Posted: Wed Aug 30, 2006 9:46 am Post subject: Multiburst generator

Site Admin Joined: 01 Jan 1970 Posts: 311

R O D U C T I O N
Although modern television receivers
and monitors are highly immune to
noise and interference, there will
always be a need for a test pattern generator.
The compact circuit presented
enables many of the basic functions of
a television receiver or monitor to be
checked. Owing to its simplicity, it provides
only a black-and-white pattern,
of course.
D E S I G N
C O N S I D E R A T I O N S
The simple test pattern of grey bars,
called a multiburst, generated by the
circuit consists of a wave train containing
different frequencies at a level of
420 mVp-p (average value 650 mV).
The multiburst enables the frequency
response, and certain other properties
of the system on test to be measured. In
a properly adjusted receiver or monitor,
all components, with the possible
exception of the 5.8 MHz burst, may be
present. The reference bar and the 2T
pulse are repeated in line 330, so the
pulse repetition rate (ppr)of these
important test signals is 50 Hz.
The multiburst also enables the
video amplifiers, sync(hronization) separator
and output amplifiers to be
tested.
Disregarding the power supply, the
In many instances,
suspect television
receivers and monitors
can be tested
with a simple test pattern
generator as
described in this article.
The circuit proposed
in this, which
consists of only a
handful of components,
generates a
series of test bars, the
so-called multiburst.
52
Design by W. den Hollander

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