Comments for John Roach http://johnroach.info Coding for life Tue, 07 Feb 2012 06:53:27 +0000 hourly 1 http://wordpress.org/?v=3.3.1 Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by John Roach http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2379 John Roach Tue, 07 Feb 2012 06:53:27 +0000 http://johnroach.info/?p=127#comment-2379 To tell the truth I have never worked with Amplitude-shift keying modulation :( . I'm sorry I can't really help you. To tell the truth I have never worked with Amplitude-shift keying modulation :( . I’m sorry I can’t really help you.

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by rajashekar bammidi http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2378 rajashekar bammidi Tue, 07 Feb 2012 00:33:08 +0000 http://johnroach.info/?p=127#comment-2378 hi john, i think its just a ASK modulation. that i'm using a train of rectangular pulses equally spaced 1usec apart. then modulating it with 10Mhz signal. now i have to demodulate it. how do i do it? hi john,
i think its just a ASK modulation. that i’m using a train of rectangular pulses equally spaced 1usec apart. then modulating it with 10Mhz signal. now i have to demodulate it. how do i do it?

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by John Roach http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2372 John Roach Fri, 03 Feb 2012 09:37:25 +0000 http://johnroach.info/?p=127#comment-2372 Could you give me the whole code including the signals? I just installed Matlab and would like to try it out. Could you give me the whole code including the signals? I just installed Matlab and would like to try it out.

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by rajashekar bammidi http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2371 rajashekar bammidi Fri, 03 Feb 2012 09:21:11 +0000 http://johnroach.info/?p=127#comment-2371 thats what i cant figure out....plz help....may be i think it is because my message is a combination of an ac and a dc signal..... thats what i cant figure out….plz help….may be i think it is because my message is a combination of an ac and a dc signal…..

]]> Comment on Getting VGA output using VHDL and a Spartan-3AN board by John Roach http://johnroach.info/2011/01/15/getting-vga-output-using-vga-and-a-spartan-3an-board/comment-page-1/#comment-2370 John Roach Fri, 03 Feb 2012 09:15:54 +0000 http://johnroach.info/?p=505#comment-2370 I'm happy to help! I’m happy to help!

]]> Comment on Getting VGA output using VHDL and a Spartan-3AN board by Alex http://johnroach.info/2011/01/15/getting-vga-output-using-vga-and-a-spartan-3an-board/comment-page-1/#comment-2369 Alex Thu, 02 Feb 2012 22:56:38 +0000 http://johnroach.info/?p=505#comment-2369 Hi, Jonh! Now I'm studying how to send signals from FPGA to VGA and I spend a lot of time to solve some problems with example for Nexys II. When I copy code of your the vga element I saw signal on the screen. Thanks for your work:) Hi, Jonh!

Now I’m studying how to send signals from FPGA to VGA and I spend a lot of time to solve some problems with example for Nexys II. When I copy code of your the vga element I saw signal on the screen. Thanks for your work:)

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by John Roach http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2368 John Roach Thu, 02 Feb 2012 21:51:37 +0000 http://johnroach.info/?p=127#comment-2368 I'm sorry to say I really don't know why you are not getting an output. I couldn't test your code because sadly I deleted my Matlab program couple months back... However I believe something is probably wrong with your filter... I’m sorry to say I really don’t know why you are not getting an output. I couldn’t test your code because sadly I deleted my Matlab program couple months back… However I believe something is probably wrong with your filter…

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by abhinay kundur http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2367 abhinay kundur Thu, 02 Feb 2012 21:06:22 +0000 http://johnroach.info/?p=127#comment-2367 this is my other mail id....this is rajashekar bammidi this is my other mail id….this is rajashekar bammidi

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by abhinay kundur http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2366 abhinay kundur Thu, 02 Feb 2012 21:04:03 +0000 http://johnroach.info/?p=127#comment-2366 because as i have explained i used carrrier of 5Mhz and my message is a 1Mhz triangle of 0.25v on a 3.5v dc. so i used a low pass cut off at 4Mhz(2*Fc. thats why..... thanks because as i have explained i used carrrier of 5Mhz and my message is a 1Mhz triangle of 0.25v on a 3.5v dc. so i used a low pass cut off at 4Mhz(2*Fc. thats why…..
thanks

]]> Comment on AM and DSB-SC Modulation and Demodulation of a Periodic Square Wave (Matlab) by John Roach http://johnroach.info/2009/11/15/am-and-dsb-sc-modulation-and-demodulation-of-a-periodic-square-wave-matlab/comment-page-1/#comment-2365 John Roach Thu, 02 Feb 2012 06:35:34 +0000 http://johnroach.info/?p=127#comment-2365 Just a couple questions about your code. Why are Fc=4e6 and Fs=32e6 ? Just a couple questions about your code.
Why are Fc=4e6 and Fs=32e6 ?

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