[PD] tuning an AM radio ideas

nward04 at qub.ac.uk nward04 at qub.ac.uk
Wed Dec 13 17:06:45 CET 2006


Getting there now. Just what I was thinking of.  Where to add in a  
bit of noise is the next thing.
Thanks Roman

On 13 Dec 2006, at 15:02, Roman Haefeli wrote:

> hi nick again
>
> i didn't want to 'steal' your idea, but i found this subject so
> interesting, that i tried to realize that approach in a pd-patch.
> the patch needs [abs~] from zexy and [lp8_butt~] from iemlib. the  
> patch
> has 3 'stations' (three sources modulated on differently tuned  
> carriers)
> and one 'receiver'. because of the very high sampling rate in the
> subpatch (1.53MHz, when pd runs with 44100Hz), the patch eats quite a
> lot of the cpu.
> surprisingly it sounds a bit like am-radio, though the quality of the
> received signal is very bad. the choice of the carrier frequencies  
> does
> have big effect on the typical am-radio artefacts.
> there are sure some things, that could be improved. maybe you have use
> for it.
>
> cheers
> roman
>
>
> On Wed, 2006-12-13 at 12:45 +0000, nward04 at qub.ac.uk wrote:
>> yep, Thats kinda the approach I was thinkin of. Off to read up on AM
>> radio a bit.
>> thanks for the suggestions
>>
>> On 13 Dec 2006, at 11:43, Roman Haefeli wrote:
>>
>>> hi Nick
>>>
>>> a possibly stupid, unrealistic and very untested idea  comes to my
>>> mind:
>>> why not build a real AM radio in pd? in a subpatch with a very high
>>> samplingrate (using [block~]-object) you could amplitude modulate  
>>> the
>>> signal you want to transmit. with a narrow band-pass filter [bp~],
>>> that
>>> is tuned to the carrier frequency, you could get back the  
>>> amplitude of
>>> the original signal. maybe you add some [noise~] to simulate cosmic
>>> radiowaves.
>>> just a few ideas. i would be interested, if this approach has a  
>>> chance
>>> to work....
>>>
>>> roman
>>>
>>> On Wed, 2006-12-13 at 11:04 +0000, nward04 at qub.ac.uk wrote:
>>>> Hi all,
>>>> I was just wondering would anyone here have an idea on a starting
>>>> point for a patch to simulate tuning in a station on an AM radio. I
>>>> want to make a virtual radio with say 5 chanels that i can tune
>>>> between replete with the hissing fizzing in between out of tune  
>>>> bits.
>>>> Thanks
>>>> Nick
>
> <am-radio.pd>
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