[Portaudio] Artifacts at 384 kHz sampling rate

Santosh Banisetty sbanisetty at iem.net
Tue Dec 1 17:05:16 EST 2015

Hello Ross,
I tried using WAVELAB as you suggested and I found the same results. Every consecutive sample is repeating. So, is the device duplication the 192 kHz stream? 


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-----Original Message-----
From: portaudio-bounces at lists.columbia.edu [mailto:portaudio-bounces at lists.columbia.edu] On Behalf Of Ross Bencina
Sent: Monday, November 30, 2015 8:12 PM
To: portaudio at lists.columbia.edu
Subject: Re: [Portaudio] Artifacts at 384 kHz sampling rate

Hello Santosh,

Have you confirmed that you can capture the audio data correctly in another application (e.g. wavelab)?

The obvious answer is that the device is just duplicating the 192kHz stream. Another possibility is that you're capturing stereo but interpreting it as mono, but from your description that seems less likely.


On 1/12/2015 3:04 AM, Santosh Banisetty wrote:
> Hello everyone,
> I am working with a 32 bit/384 kHz audio recording device called 
> Joplin MK II.  I am using ASIO and I want to record at 384 kHz.
> When my sampling rate is 384 kHz, the reconstructed sinewave is little 
> weird as shown below. Every consecutive sample has the same value as 
> the previous sample.
> When the sampling rate is 192 kHz, I see a well re-constructed 
> sinewave as shown below. Every sample has a different value.
> So, my question is why am I not able to properly re-construct the 
> input sinewave when my sampling rate is 384 kHz?
> Thank you.
> Regards,
> Santosh
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