Posts: 2754
Location: Mauston, Wisconsin | Steve, Maybe I can explain that better than b, - An LCD is inherently a digital device, so you just can't just feed it an analog signal. It requires a digital input. The majority of this whole analog to digital conversion debate came about because of the mandated switch of analog TV to digital TV. If you had a analog TV - now you need to have a digital to analog converter box for your TV! The same is true of old computers with analog CRT drivers- to use a LCD display you need a converter or an lCD display with the a/D converter built into it....
It would be very stupid to go digital to analog and back -> analog to digital. That would increase the complexity and the hardware cost, i.e., you already need an analog to digital converter for the transducer to MPU interface, but now also a digital to analog converter, and another analog to digital converter for the interface to the LCD. Does that really make sense? Why go through three (3) conversions? The A/D-D/A chip manufacturer's might like it!
Most modern sonar's are analog to digital, as I said above. If I could figure out a direct digital to digital sonar, I would probably be very rich. But then, I'd probably also have to invent a new sonar transducer, and the US NAVY would probably then have to lock me up!
Have fun!
Al
Edited by ESOX Maniac 8/29/2010 9:51 AM
|
