Recent content by sm52

Everything is so, but. When the phase graph is formed, for the purpose of discussing the behavior of the phase, we can assume that all the values of the expanded phase on this graph are absolute. Otherwise, I will say that I see 433 degrees at a frequency of 112 hertz, and my opponent will say...

Images 1 and 2 are ok. In the 3rd picture, the 112 Hz phase graph point has a phase of 433 degrees. After wrap and unwrap, the 112 Hz phase plot point has a phase of 69 degrees. The same graph point should not have different values within the same graph. I understand that 69 + 360 is...

John, hi. I noticed strange behavior of the phase trace. If the phase line does not cross +180 -180 degrees, it is always displayed correctly. If the phase line crosses +180 -180 degrees, unwrap the phase and place a marker with the mouse pointer on the part that is above 180 degrees, then wrap...

I am not free to engage in activities distracted from my own tasks for a long time. Perhaps someone else will be interested in this.

I read it. Your program extracts a lot of information from measurement files. Everything seems to be true. The only thing that doesn't match is the line - `mid shield` phase is unwrapped, reaching about +17,236 degrees. In fact, it's 1350 degrees. You did not say that the required measurements...

Thanks for the answers. I didn't read the main question of this thread carefully.

Thank you. This solved one problem, but did not solve the comparison problem. Because the peaks are at different times. And also because for subwoofer measurements, REW considers the first maximum peak to be the peak of the impulse. Although there are 2 more in front of it, the first of which...

John, why are you only writing about loopback connections? Is acoustic synchronization also reliable for determining the exact impulse timing in all cases?

I looked at all the measurements. The time range is always the same as in the settings. Only with a start offset. I need the time axis to always remain fixed. To understand when comparing what changes from measurement to measurement. Is this possible? What settings should I use for this?

I didn't even mean 100 m of loop cable. Of course, only acoustic synchronization. REW can detect and compensate for differences in input and output clock rates. I always use acoustic synchronization. It's reliable and simple. Your calculations show minimal error for your method. But it's better...

John, I have 10 subwoofer measurements. I'm looking at the 'spectrogram' tab. By default, my time range for drawing a spectrogram is -2 ms +30 ms. The full frequency range measurement for a non-subwoofer is displayed as in the settings. For a subwoofer measured at full range, the bottom data...

Too difficult. The concept of standard listening distance cannot always be used. What if you need to measure at a distance of 20 m, or 100 m? Such cases have been discussed here more than once. To make the input and output work with different devices, REW has Java drivers. This is used by...

Give it a try.

The input device is listed as a computer microphone. But there must be Umik. The test signal level is only 20 dB above the noise level. Try raising the test signal level by 10-20 dB.

No. REW should work on Win11. Look in the sound properties for your sound card for all the tabs where there may be Windows sound 'improvements'. If they are enabled, disable them. And check 2 boxes for exclusive rights. I turn off all audio devices except those used for measurement when I take...