Analog signal to digital convertion?
Posted on Mar 31, 2008 under Digital news and reports |Say an analog signal is converted to digital square wave signal using a threshold.
Can we reverse the process?
i.e. get back the original analog signal using the digital one? How?
Please explain in basics and give practical examples.
March 31st, 2008 at 7:02 am
Yes the process can be reversed, that is what those converter boxes for your cable television does before it goes to your analog TV.
March 31st, 2008 at 7:02 am
Analogue to digital conversion is acheived by sampling. That is to take a measurement of the amplitude of an analogue signal and express it as a number in binary (ie digital) form.
To reconstruct the analogue signal, the digital samples are used to recreate the analogue signal in real time.
A practical example is telephony using pulse code modulation. (PCM) The speech in a telephone call is sampled at 8000 samples per second and the analogue value is converted to an eight bit digital number thus giving a 64000 bit per second digital signal. This is then assembled with 29 other channels (plus 1 signalling and 1 synch channel) to form a digital transmission speed of 2048 kilobits per second. This is then transmitted over digital transmission systems.
The distant end receives the digital signal and separates the 30 channels into 64Kbit/s channels and the 8 bit digital number is used to create a 1.25 microsecond pulse at the amplitude determined by it's value, thus recreating the analougue signal by doing this 8000 times a second.
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