REW for the first time

[arivel]

I also tried to play a sweep file using VLC but nothing happens either

 

[John Mulcahy]

When you say "a sweep file" is it a Measurement sweep file? Did you select the option to include the timing reference and do you hear the timing reference play? If you can't hear the timing reference neither can REW...

 

[arivel]

yes exactly. I tried both with a REW generated measurement sweep file (wav) and also with third party sweep files played with VLC.
What do you mean by feeling the time reference? . if you mean the speaker playing, no, I don't hear anything .
if I have REW do the sweep instead, it works

 

[John Mulcahy]

When the sweep file is generated the option to include a timing reference must be selected. REW is listening for the timing reference to start its capture.

 

[arivel]

hi .
there are two timing references .the first is that of the sweep generator (sweep A) the second is that of the measurement (sweep B) but in this case it is disabled .
so in sweep A what value should I insert ?

 

[JStewart]

Sweep A is the file you are making. You checked the box to include a timing reference correctly. The Timing Ref Trim value box I expect is used to increase or decrease the volume of the timing reference relative to the sweep signal. Just leave it at zero.

In B the Timing drop down is grayed out because it does not apply to sweeps originating from a file as you are doing in this case.

Short answer. You have set things correctly.

 

[arivel]

hi .
so why nothing comes out of the speaker ?.
i also tried to change the input thinking it was a mistake in selecting the input for the microphone and output for the power amplifier instead nothing changes .
thanks anyway for the answers .

 

[John Mulcahy]

The playback comes from playing the file through whatever file player you use.

 

[sm52]

In the generator, you create a file with test signals. With the button pointed by your arrow, you can make the whistle louder or quieter before and after a sweep. You can leave it as it is. If you have created a file with the correct sample rate and depth of quantization(bits), with whistles enabled, its storage location must be set to REW. It looks like SWEEP rewwav.wav already in place, and rew has read it. Next, you press START, after which REW will wait for a sound from your player, in which you need to click on playing the same file with test signals.
If there is no sound, then there is no output from the player to the driver that should be sounding at the moment.

 

[arivel]

let's see if I understood correctly.
are you saying that you have to load the sweep file on REW and then play the same file with a player such as VLC or others of this type?. if this is what you have to do, in my case it doesn't work because REW takes possession of the output becoming its sole owner and all the other programs can't work, I've already tried.

 

[John Mulcahy]

are you saying that you have to load the sweep file on REW and then play the same file with a player such as VLC or others of this type?

Yes.

REW takes possession of the output

No, REW does not use the output at all for File playback measurements, only the input.

 

[John Mulcahy]

As an aside, if the output you want to use is on the same computer running REW why would you use file playback at all?

 

[sm52]

and all the other programs can't work, I've already tried.

Try specifying a REW output that does not have an EXCL prefix. Drivers must be java. It works for me.

 

[arivel]

@sm52 I can't use java because I need asio to make e-mu 0404 work.
@John Mulcahy at this point I don't understand anything anymore and my head is in a mess.
let's try to take it one step at a time, can you please explain to me who or what has to play the wav file created by the REW generator application?.

 

[sm52]

I can't use java

Then you will not succeed. Because ASIO only allows one device to operate. You can install FlexASIO and select it in REW. It allows you to do what you want, which is to choose different audio input and output devices.

 

[John Mulcahy]

I can't use java because I need asio to make e-mu 0404 work

Really? That's pretty unusual, the card should have WDM drivers, in which case it can be accessed using the Java drivers in REW. You originally said you needed to use a file so that the signal could go through Equalizer APO, but if you use ASIO that wouldn't happen. Signals sent via the regular Java drivers (device names that do not start EXCL) would pass through Equalizer APO.

 

[arivel]

update .
I managed to get sweep wav to work with VLC together with REW but the measurement stops and freezes when it reaches 4% exactly like before. I installed asio4all v2 and also hi-fi asio bridge. This time the signal is reproduced correctly by the speaker but the microphone does not record anything. I will try to tinker a bit.
Maybe the partial success is due to the collaboration of both drivers or just one, I don't know yet.
I have not used APO for the moment

 

[JStewart]

update .
I managed to get sweep wav to work with VLC together with REW but the measurement stops and freezes when it reaches 4% exactly like before. I installed asio4all v2 and also hi-fi asio bridge. This time the signal is reproduced correctly by the speaker but the microphone does not record anything. I will try to tinker a bit.
Maybe the partial success is due to the collaboration of both drivers or just one, I don't know yet.
I have not used APO for the moment

Can you hear the timing chirp when you play the REW playback file? The timing chirp from the file playback starts the recording process. Until then the recording process waits.

Nevermind. You wrote you can hear it.

 

[John Mulcahy]

5.20.13 is quite an old REW version, any reason you are using that rather than a current release?

 

[arivel]

why it works well on win7

 

[sm52]

REW_windows-x64_5_40_beta_78-api also works well on Win7.

 

[arivel]

I did it.
I used flexASIO instead of ASIO4all because the latter conflicted with the original ASIO driver of e-mu0404.
in the measurement graph you can see three SPL responses. the one in blue is the response without any type of EQ applied.
the one in green is a test that I wanted to do to see if everything worked, In APO I reduced almost to zero all the frequencies starting from about 80hz and you can see the result with the SPL response.
finally I wanted to play with APO to try to improve the response and make it as flat as possible and the result can be seen in the SPL response in red .thanks to sm52