Describe how analogue data is transmitted by a digital electronic circuit?
Saturday, July 4th, 2009 at
5:02 pm
thanks doesn’t matter just need a general description thanks
Tagged with: general description
Filed under: Electronic Circuits
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It will be done by means of analog to digital conversion ADC.
The analog signal will be cut into segments. Each segment will be represented by a 1 or 0 or bits. These bits will be transmitted as pulses, burst, or packets depending on what transmission modes you want to use.
basically you check the ‘analogue’ level of a signal at regular intervals.
Convert that number (say 6) to a digital Number 0110
and send or record 4 "bits" of two levels (a low 0 level or high 1 level) not have to measure accurately an analogue level.
for CD Audio for example, you sample at 22Khz and use a 16 bit digital word (0000 0000 0000 0000) or a range of 0 – 65564 levels.
At the other end, you use the Number (0110) to drive a digital to analogue converter to re-create the level ‘6′.
So you are sending data faster (higher bandwidth) but you don’t need to be as accurate in detecting the level… Noise (hiss, technically uncertainty or lack of accuracy) on the signal cannot be added. 0110 is always 0110, until it gets to the other end.
analogue 6 => becomes 6 + noise over time.
You need to convert the analog voltage level to a digital number. You do this with an Analog to digital converter. Called ADC chip. Then you send the digital information to a Digital to Analog converter. Called DAC chip. Both ADC and DAC chips use op-amps to convert signals from one format to another. If you want more info look up ADC and DAC IC’s on line, there are hundred’s of them out there.