Create FM stereo from Matlab.
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From: Jerry Avins on 22 Nov 2009 15:12 Richard Todd wrote: > glen herrmannsfeldt <gah(a)ugcs.caltech.edu> writes: > >> Jerry Avins <jya(a)ieee.org> 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? >> (snip) >> >>> A matter of curiosity: What will you do with it once you get it working? >>> You can't tune a receiver to Matlab. >> I think I remember seeing in books external stereo decoders, >> but I don't remember ever actually seeing one. Just like we now >> have decoders for digital television, when stereo broadcasting >> was new there would have been decoders to connect to mono tuners. When stereo was new, large-scale integration was not yet a commercial reality. Some tuners came with an output jack that allowed the connection of a demultiplexer chassis (a tap before the preemphasis filter) but I never actually saw one. People just bought stereo-capable receivers. > I've never seen one either, but at one time my dad had an old FM radio > that was mono but had a set of outputs at the back where one could > supposedly hook up a stereo decoder. He didn't have the decoder though. > The radio was tube-based, and dated from the 1950s, IIRC. Fisher? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
From: disney_snoopy on 22 Nov 2009 19:08 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 - yup Randy u r right! If i were know how to do for the Matlab, then wont be here asking a question for the Matlab clue... Any help on that or tutorial of that? I found that here are not able to attach picture if not i will attach the pic that what is the outlook that i want. Thankz
From: disney_snoopy on 29 Nov 2009 18:57 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 - Please could anyone here help me on the Matlab? I know how to plot for the pilot frequency. But i doesnt know how to plot the L+R and L-R region on Matlab. Please help me on how to plot those region. Thank You
From: Randy Yates on 29 Nov 2009 19:33 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 - > > Please could anyone here help me on the Matlab? > > I know how to plot for the pilot frequency. > But i doesnt know how to plot the L+R and L-R region on Matlab. > > Please help me on how to plot those region. Do you know how the spectrum is structured for a commerical FM signal? What is your input signal? -- Randy Yates % "So now it's getting late, Digital Signal Labs % and those who hesitate mailto://yates(a)ieee.org % got no one..." http://www.digitalsignallabs.com % 'Waterfall', *Face The Music*, ELO
From: disney_snoopy on 29 Nov 2009 20:46
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! Thank You |