[sdiy] Experiment with bandlimited ramps - MY FAULT

[Scott Gravenhorst]

The EQ was turned on.  It looks fine without it... Sorry...


music.maker at gte.net wrote:
>Tom Wiltshire <tom at electricdruid.net> wrote:
>>Hi All,
>>
>>I've done some experiments generating bandlimited ramp waves at  
>>various frequencies and with various numbers of harmonics. The  
>>results (lots of sound files - page loads fairly slowly) are at:
>>
>>http://www.electricdruid.com/index.php?page=thoughts.bandlimited
>>
>>The idea was to find out practically how many harmonics are required  
>>for an accurate additive synthesis. Since by the time you're at a  
>>5KHz fundamental, you'd be lucky to hear the 5th harmonic, I started  
>>at about 85Hz. These low notes need the most harmonics to sound good.
>>
>>Have a listen and see what you think.
>>
>
>When I listen to the aiff files with Windows Media Player grabs the file and plays
>it as well as displays the waveform.  (Quicktime for Windows does wierd things to
>my systems)  The non-octave samples all look like clipped sinewaves for the most
>part.  The OCT sounds look similar, with a glitch pulse included in the clipped
>portion of the positive peak.  The OCT2 sounds look more like a band limited ramp,
>but with some distortion included that I can't visually identify.
>
>Is this simply a problem with the WMP9 waveform display? i.e., is the sound OK? 
>For what it is worth, I've done lots of DAC listening myself to sounds I've made
>here - but they are wav files, not aiff.  The wavs look as they should.  Soooo I'm
>wondering if WMP9 plays aiff correctly and displays incorrectly?  Or is it barfing
>both?
>
>Can anyone confirm or deny?  I'm using WinXP SP2 with Windows Media Player 9.
>
>-- ScottG
>________________________________________________________________________
>-- Scott Gravenhorst
>-- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
>-- FatMan: home1.gte.net/res0658s/fatman/
>-- NonFatMan: home1.gte.net/res0658s/electronics/
>-- When the going gets tough, the tough use the command line.
>
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-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.