Create FM stereo from Matlab.
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From: glen herrmannsfeldt on 29 Nov 2009 21:28 disney_snoopy <disney_snoopy(a)hotmail.com> wrote: > my input audio signal is 1kHz and my sampling freq is 200kHz. > Please help! Generate sum and difference, generate pilot signal, generate AMSC subcarrier with the appropriate phase, add all three together. A little more complicated since 200 isn't a multiple of 38. -- glen
From: Randy Yates on 30 Nov 2009 00:42 glen herrmannsfeldt <gah(a)ugcs.caltech.edu> writes: > disney_snoopy <disney_snoopy(a)hotmail.com> wrote: > >> my input audio signal is 1kHz and my sampling freq is 200kHz. >> Please help! > > Generate sum and difference, generate pilot signal, generate AMSC > subcarrier with the appropriate phase, add all three together. > > A little more complicated since 200 isn't a multiple of 38. glen, even his specification is incomplete. The input audio should be STEREO, i.e., left and right. -- Randy Yates % "Maybe one day I'll feel her cold embrace, Digital Signal Labs % and kiss her interface, mailto://yates(a)ieee.org % til then, I'll leave her alone." http://www.digitalsignallabs.com % 'Yours Truly, 2095', *Time*, ELO
From: Randy Yates on 30 Nov 2009 00:43 disney_snoopy <disney_snoopy(a)hotmail.com> writes: > On Nov 21, 12:17 am, Randy Yates <ya...(a)ieee.org> wrote: >> disney_snoopy <disney_sno...(a)hotmail.com> writes: >> > On Nov 20, 11:26 am, glen herrmannsfeldt <g...(a)ugcs.caltech.edu> >> > wrote: >> >> disney_snoopy <disney_sno...(a)hotmail.com> wrote: >> >> > I would appreciate if anyone here could help me. >> >> > I was thinking to create a FM stereo with the RDS and L+R and L-R >> >> > channel in Matlab. >> >> > But i doesnt know how to do on that... >> >> > Can anyone here help me plz? >> >> >> What sample rate are you planning to use? If it is a multiple >> >> of 38kHz it would be somewhat easier than other frequencies. >> >> >> -- glen >> >> > Hi Glen, >> >> > For example my audio is 1kHz, my sample rate is 200kHz. And i plan to >> > create out my FM stereo till the 57kHz signal of my RDS. >> > Any help on that in my Matlab on how to write the code or by apply >> > fdatool? >> >> Your continued allusion to fdatool leads me to believe you don't >> have a clue. It's like asking, "How do I apply a 9/16" wrench to >> rebuild my engine?"! >> -- >> Randy Yates % "I met someone who looks alot like you, >> Digital Signal Labs % she does the things you do, >> mailto://ya...(a)ieee.org % but she is an IBM."http://www.digitalsignallabs.com% 'Yours Truly, 2095', *Time*, ELO - Hide quoted text - >> >> - Show quoted text - > > my input audio signal is 1kHz and my sampling freq is 200kHz. > Please help! Why don't you back up and tell us what it is you're trying to do. I mean, is this a class project? -- Randy Yates % "Maybe one day I'll feel her cold embrace, Digital Signal Labs % and kiss her interface, mailto://yates(a)ieee.org % til then, I'll leave her alone." http://www.digitalsignallabs.com % 'Yours Truly, 2095', *Time*, ELO
From: glen herrmannsfeldt on 30 Nov 2009 01:20 Randy Yates <yates(a)ieee.org> wrote: > glen, even his specification is incomplete. The input audio should > be STEREO, i.e., left and right. I thought about mentioning that, but decided not to. Otherwise, it is much easier to create the stereo signal with a mono source... -- glen
From: disney_snoopy on 30 Nov 2009 02:48
On Nov 30, 1:42 pm, Randy Yates <ya...(a)ieee.org> wrote: > glen herrmannsfeldt <g...(a)ugcs.caltech.edu> writes: > > disney_snoopy <disney_sno...(a)hotmail.com> wrote: > > >> my input audio signal is 1kHz and my sampling freq is 200kHz. > >> Please help! > > > Generate sum and difference, generate pilot signal, generate AMSC > > subcarrier with the appropriate phase, add all three together. > > > A little more complicated since 200 isn't a multiple of 38. > > glen, even his specification is incomplete. The input audio should > be STEREO, i.e., left and right. > -- > Randy Yates % "Maybe one day I'll feel her cold embrace, > Digital Signal Labs % and kiss her interface, > mailto://ya...(a)ieee.org % til then, I'll leave her alone."http://www.digitalsignallabs.com% 'Yours Truly, 2095', *Time*, ELO Hi Glen and Randy, This is my DSP project. what i am doing is use a software to prove the FM stereo is work which i can get the outlook structure to this FM stereo broadcast. After get the FM stereo structured, apply an audio frequency to this FM stereo and calculate out the THD. What i know from here is the L+R region is 50Hz to 15kHz. How to implement it to the Matlab i really no idea. Hence, now im finding for help or comment on which command i should use to implement the L+R region. I tried to use multiband coding for this region but i found that i cant code my pilot frequency. The only thing that i can do in this Matlab now is only the pilot freq. So now do you all get what i mean and what i want? Thankz |