Distortion noise in measurement

[Balance]

I have an HP EliteBook 830 G6 laptop with Windows 64.
I installed REW version 5.31.3 on it. Also Asio4All version 2.16.

I have several issues and would appreciate help.

The first is that when I perform a measurement there are strange noises from the speakers, some kind of distortion. It is not clear what causes this. How can I fix it?

The second issue is that while measuring, it actually performs another one (2 measurements). On my previous computer this was not the case.

Thanks

 

[dcibel]

My car makes a noise, what's wrong with it?

What is your sound card / audio interface? What have you configured in the measurement window? Are you using EXCL device in REW preferences? Share a MDAT file of a measurement? There's not much to go on with what you've provided.

 

[Balance]

Does you car make distortion noise?
Sound card is Realtek, HDMI interface
It occures on every speaker measurement. i didn't save the measurment as the mic collect this noise along with the measurment.

What EXCL device is?

 

[dcibel]

Manual Section of interest:

Getting set up for measuring

 

[Balance]

Why do I need this?
The default device is the Trinnov processor. And I’m using Asio4All and not Java

 

[dcibel]

Why?

 

[Balance]

This is how I've been working for years based on an installation guide I read in the past.
The default device is the device to which the speakers you want to measure are connected.

Do you mean that it's better to work with Java and not Asio4All?
Does Java support multi-channel measurements in Windoes OS?

Are there instructions for this that I can read?

 

[Balance]

On the measurement screen I saw that 1 was marked under repeatation.
This may be what causes the timing to beep twice, once at the start of the measurement and once in the middle.
This setting is not available for change (off) so I can't disable it.

Does anyone have an idea?

 

[John Mulcahy]

Analysis preferences:

The Adjust clock with acoustic ref selection controls whether REW compensates for clock rate differences between input and output when using the acoustic timing reference. If this option is selected an additional timing reference signal is played at at the end of the sweep and the time between the timing reference signals is used to calculate any clock adjustment required to match the input and output device clock rates.

Does Java support multi-channel measurements in Windoes OS?

Yes, if you select the device names that start EXCL so that WASAPI Exclusive is used.

 

[Balance]

Analysis preferences:

The Adjust clock with acoustic ref selection controls whether REW compensates for clock rate differences between input and output when using the acoustic timing reference. If this option is selected an additional timing reference signal is played at at the end of the sweep and the time between the timing reference signals is used to calculate any clock adjustment required to match the input and output device clock rates.

Is this option required or is it okay to disable it?
This is the first time I've encountered this.

 

[John Mulcahy]

If the input and output are on different devices the second timing ref signal allows REW to correct for any small difference in their clock rates. Up to you whether you use it. I don't know why you would refer to the timing reference signal as "distortion" though.

 

[Balance]

The distortion noise I'm referring to is not the timing reference beep but additional noise throughout the measurement. Something is wrong.

Regarding input and output devices... I'm measuring speakers connected to a Trinnov processor, which I assume is considered an input device, what is the output device?

 

[John Mulcahy]

Input device = device REW gets audio from. Output device = device REW sends audio to.

 

[Balance]

I see, so the REW on my laptop gets audio from the Trinnov through HDMI and send audio to the same Trinnov…
I guess that in this case the additional timing reference signal is not necessary.

Thanks