Re: [Audacity-nyquist] Frequency response

[David R. S. <dav...@sh...>]

Okay thanks Paul, that's more specific. And yes, each frequency generated 
by buzz is equal in amplitude to each other.

I'm curious - what's the _maximum_ frequency your sound card can generate?

David

-- 
David R. Sky
http://www.shellworld.net/~davidsky/


On Sat, 4 Jul 2009, paul beach wrote:

> Buzz works perfect. I was referring to the frequencies which the sound
> card can't handle. More than 20 khz exceeds the specs of the soundcard.
> At that point the peaks are not equal. Otherwise buzz creates multiples
> of a frequency, and each peak is the same height.
>
> Paul
>
> On Sat, 4 Jul 2009 12:57:18 -0700 (PDT), "David R. Sky"
> <dav...@sh...> said:
>> Then what did you mean in your first post by "going off the scale"? it
>> sounded like you were complaining about something that was wrong with
>> buzz.ny.
>>
>> Please be specific!
>>
>> Thanks
>>
>> David
>>
>> --
>> David R. Sky
>> http://www.shellworld.net/~davidsky/
>>
>>
>> On Sat, 4 Jul 2009, paul beach wrote:
>>
>>> Hi,
>>>
>>> Buzz worked without a problem, I used 11 overtones. This seems quite
>>> useful to check the bandpass of a complex filter, where there is
>>> generally no way to do a numerical evaluation.
>>>
>>> Paul
>>>
>>> On Sat, 4 Jul 2009 10:34:44 -0700 (PDT), "David R. Sky"
>>> <dav...@sh...> said:
>>>> Hi Paul,
>>>>
>>>> That buzz.ny file is a simple 'wrap' around the Nyquist buzz function and
>>>> should only produce the number of overtones you specify in the plug-in.
>>>> For example, frequency 440 hz with 4 overtones should result with the
>>>> following frequencies returned: 440 880 1320 1760 and possibly also 2200
>>>> .
>>>>
>>>> Also, I wrote that plug when there was an error in the buzz function
>>>> which Dominic Mazzoni had pointed out to me, so I'd put his corrected
>>>> code
>>>> in the plug, some time back in Audacity 1.2.x. Something might have
>>>> changed since then.
>>>>
>>>> What version of Audacity are you using?
>>>>
>>>> David
>>>>
>>>> --
>>>> David R. Sky
>>>> http://www.shellworld.net/~davidsky/
>>>>
>>>>
>>>> On Sat, 4 Jul 2009, paul beach wrote:
>>>>
>>>>> I was checking the frequency response of the sound card. It should fail
>>>>> somwhere at greater than 20khz because of Shanon's theorem. David's Buzz
>>>>> generator was used, with frequencies set from 1000 to 21000 in steps of
>>>>> a thousand.
>>>>>
>>>>> http://www.shellworld.net/~davidsky/buzz.zip
>>>>>
>>>>> Amplitude is set at .5
>>>>> My respone is flat up to 19 khz and then takes off after that. It may be
>>>>> that some sound cards trap or equalize so that it does not alias and
>>>>> create a hash around 10 khz.
>>>>>
>>>>>
>>>>> On Fri, 03 Jul 2009 21:28:58 -0700, "paul beach"
>>>>> <sni...@fa...> said:
>>>>>> I was asked about equalizer and tried a 20khz signal. The spectrum drops
>>>>>> about 30dB. Is it just my old Windows computer + sound card, that does
>>>>>> that? To be expected since capacitive reactance is inversely propotional
>>>>>> to frequency?
>>>>>> --
>>>>>>   paul beach
>>>>>>   sni...@fa...
>>>>>>
>>>>>>
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