1.What is BER? Explain.2.What do you mean by Signal to Noise ratio (S/N) ?

Question

1.What is BER? Explain.2.What do you mean by Signal to Noise ratio (S/N) ?

Answer 1

BER stands for Bit Error Rate and it is a measure of how many incorrect bits are being received as part of a streaming video signal.  Generally a higher BER is bad, because it means more errors are being observed. The precise number is not very meaningful when comparing different receivers because it can be measured in at least 4 different ways (before or after error correction, for example).

Signal to noise ratio (SNR) is a measure of the amount of good signal divided by the amount of noise being received.  There are quite a few ways of defining signal to noise, but in general a high signal-to-noise ratio is good because it means you are getting more signal and less noise.   SNR is usually measure using a logarithmic scale, meaning the SNR value is the logarithm of the actual ratio.

Generally, high noise (low SNR) can lead to high BER. Moderate SNR can be corrected by smart devices.  High BER is bad, and usually leads to observable problems with the signal you are watching.