A digitized TV picture is to be transmitted from a source that uses a matrix of

Question

A digitized TV picture is to be transmitted from a source that uses a matrix of 480 x 500 pixels, where each pixel can have one of 32 intensity values. Assume that 30 pictures are sent every second.

1) What is the data rate in units of bits/second that will be required to transmit this picture on a communications channel?

2) Given that this picture is to be transmitted over a noise-less CATV channel with a bandwidth of 6 MHz, will a signal set of QAM-64 be sufficient to achieve that data rate?

3) What is the signal-to-noise ratio in units of dB that will be required to transmit this picture on a noisy CATV channel with a bandwidth of 6 MHz?

Explanation / Answer

1. Intensity Level = 32.

Since intensity level here is 32 and each pixel can have a value of one of the levels so the number of pixles required will be 5 as (32=25 ). So in 5 pixels we can represent 32 levels. Now one picture =480

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