[sdiy] Cheap audio spectrum analyzer.. finally..

[Roman Sowa]

That's called glissando
:)

Roman

W dniu 2015-10-28 o 08:28, rsdio at audiobanshee.com pisze:
> Thanks for the info.
>
> There must be a different term for a "chirp" that only contains
> frequencies of integral multiples of the sample rate, because the
> standard definition of chirp is a sweep over a continuous range of
> frequencies. The latter kind even occur naturally in audio-frequency
> radio waves.
>
> Brian
>
>
> On Oct 27, 2015, at 10:25 PM, Tim Ressel <timr at circuitabbey.com>
> wrote:
>> Quite sure. The chirp was generated using an inverse FFT. This
>> ensures there is energy only in the FFT buckets, thus preventing
>> the spill over you usually get with FFTs.
>>
>> On 10/27/2015 9:51 PM, rsdio at audiobanshee.com wrote:
>>> Are you sure it's using an FFT in that mode? As the videos show,
>>> it's possible to do the whole process in the time domain. If the
>>> scope has a rectifier mode, you'd get a clean line instead of a
>>> solid shape for the envelope.
>>>
>>> Brian
>>>
>>> On Oct 27, 2015, at 12:10 PM, Tim Ressel <timr at circuitabbey.com>
>>> wrote:
>>>> I have used the 35660 extensively. It is an excellent box for
>>>> its age. It has a mode where you feed a chirp through the DUT
>>>> and it magically smooths out the FFT results and gives a clean
>>>> line. Very nice!  Wish I had one.
>>>>
>>>> On 10/27/2015 10:28 AM, Jean-Pierre Desrochers wrote:
>>>>> I finally decided to go for this:
>>>>>
>>>>> HP 35660A (with option 001 memory installed)
>>>>> http://www.sglabs.it/public/SgLabs_HP%2035660A.pdf
>>>>>
>>>>> It was not cheap but around one third of eBay's mean prices
>>>>> for those working condition HP testers.. and the dealer was 1
>>>>> hour car ride from my home. I think it's a good investment.
>>>>> Ooooff !
>>
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