usrp-users@lists.ettus.com
Discussion and technical support related to USRP, UHD, RFNoC
View all threadsRe: [USRP-users] E100 : 32 kHz audio problem
sorry for the late reply, last 2 weeks have a been a perfect storm of insanity ... anyways, I tried running my E100 based FM receiver with 32kHz and you're right it doesn't work but 16kHz work. I know that 32kHz used to work in the 2.6.29 kernel and that the audio device itself supports it ... if you really want 32kHz and you're adventurous you can poke around the driver implementation and I think there's an enum type somewhere that might fix this I can dig through my old notes to find the info though I never got it to work personally I just used the standard driver for 2.6.29 and it just worked.
al
-----Original Message-----
From: Christophe ALEXANDRE christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Sent: Sat, Aug 27, 2011 2:11 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
i hear something very noisy and the aU's output very fast.
There is nothing in my flowgraph, just a 1 kHz sinus source
plugged in an audio sink. It's just to test the E100's audio.
It playbacks correctly only at 16, 44.1 and 48 kHz.
Le 26/08/2011 22:59, Almohanad Fayez a écrit :
Are you able to hear something at least with some skipping or you can't hear anything? Are the aU's outputed to the screen very fast or are they a few at a time? It might be that the processor is not able to keep up with your data processing in the flowgraph itself and you actually need to perform some flowgraph optimization. For example a channel filter can definitely kill your runtime performance if you're not neon or dsp optimizing it.
I'll download your script and run it on my E100 but I might not get around that till early next week ...
al
-----Original Message-----
From: Christophe ALEXANDRE christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Cc: usrp-users usrp-users@lists.ettus.com
Sent: Fri, Aug 26, 2011 3:06 pm
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
in /usr/share/alsa/alsa.conf
i have changed the line :
defaults.pcm.dmix.rate 48000
to 32000 with no success. this has no effect
on my gnuradio script (even after reboot). Same output.
Le 26/08/2011 18:41, Almohanad Fayez a écrit :
aaaw, completely forgot about the the alsa.conf configuration ... so you're absolutely right the driver supports more sampling frequencies than it will allow you to do the only I figured out how to get around it is by changing the default frequency in your "alsa.conf" file, i forget the exact directory where it is. In the conf file look for default frequency ... it defaults to 48000 Hz change that to your desired frequency 16000Hz or 32000Hz and you should be set to go.
this is more of a quick and dirty fix and might impact audio performance in programs other than gnuradio personally I only use audio in gnuradio so I never bothered looking up a cleaner solution.
al
-----Original Message-----
From: christophe.alexandre christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Cc: usrp-users usrp-users@lists.ettus.com
Sent: Fri, Aug 26, 2011 4:13 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
I tried both, same result. This is the
Terminal output using 32 kHz audio sample rate :
root@usrp-e1xx:~/grc# ./essai_audio.py
Press Enter to quit:
aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
Regards
C.Alexandre
I found that using "default" as the playback device and "hw:0,0" as the
capture device work best on the omap3530 processor with gnuradio.
al
-----Original Message-----
From: ALEXANDRE Christophe christophe.alexandre@cnam.fr
To: usrp-users usrp-users@lists.ettus.com
Sent: Thu, Aug 25, 2011 3:49 pm
Subject: [USRP-users] E100 : 32 kHz audio problem
Hi list,
i'm still digging in my E100 and trying to
implement an FM receiver. I can make it work,
but i realize there is still an audio problem.
i can't use 32 kHz audio rate (nor 22050). The E100 supports it,
but it only outputs noise.
i send you essai_audio.py to check it. The ouput
shows underflows which is enough strange.
i can only use 16 k, 44.1 k and 48 k.
As the E100 uses an 64 MHz clock, the 32 kHz is very usefull because
you can divide master clock by 2000 to get it.
So my FM receiver uses a 16 KHz audio rate. It works, but
i loose part of the spectrum.
any ideas are welcome !!!
Regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
USRP-users mailing list
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
yes, the device supports it, but it doesn't work.
i think it's a driver problem but i'm not sure
it deserves further investigation.
tweaking angstrom can be very time consuming.
i can live without 32 kHz, using the rational resampler
and 48 kHz.
regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
----- Original Message -----
From: Almohanad Fayez
To: christophe.alexandre@cnam.fr ; usrp-users@lists.ettus.com
Sent: Thursday, September 08, 2011 10:23 PM
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
sorry for the late reply, last 2 weeks have a been a perfect storm of insanity ... anyways, I tried running my E100 based FM receiver with 32kHz and you're right it doesn't work but 16kHz work. I know that 32kHz used to work in the 2.6.29 kernel and that the audio device itself supports it ... if you really want 32kHz and you're adventurous you can poke around the driver implementation and I think there's an enum type somewhere that might fix this I can dig through my old notes to find the info though I never got it to work personally I just used the standard driver for 2.6.29 and it just worked.
al
-----Original Message-----
From: Christophe ALEXANDRE christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Sent: Sat, Aug 27, 2011 2:11 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
i hear something very noisy and the aU's output very fast.
There is nothing in my flowgraph, just a 1 kHz sinus source
plugged in an audio sink. It's just to test the E100's audio.
It playbacks correctly only at 16, 44.1 and 48 kHz.
Le 26/08/2011 22:59, Almohanad Fayez a écrit :
Are you able to hear something at least with some skipping or you can't hear anything? Are the aU's outputed to the screen very fast or are they a few at a time? It might be that the processor is not able to keep up with your data processing in the flowgraph itself and you actually need to perform some flowgraph optimization. For example a channel filter can definitely kill your runtime performance if you're not neon or dsp optimizing it.
I'll download your script and run it on my E100 but I might not get around that till early next week ...
al
-----Original Message-----
From: Christophe ALEXANDRE <christophe.alexandre@cnam.fr>
To: Almohanad Fayez <alfayez@aol.com>
Cc: usrp-users <usrp-users@lists.ettus.com>
Sent: Fri, Aug 26, 2011 3:06 pm
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
in /usr/share/alsa/alsa.conf
i have changed the line :
defaults.pcm.dmix.rate 48000
to 32000 with no success. this has no effect
on my gnuradio script (even after reboot). Same output.
Le 26/08/2011 18:41, Almohanad Fayez a écrit :
aaaw, completely forgot about the the alsa.conf configuration ... so you're absolutely right the driver supports more sampling frequencies than it will allow you to do the only I figured out how to get around it is by changing the default frequency in your "alsa.conf" file, i forget the exact directory where it is. In the conf file look for default frequency ... it defaults to 48000 Hz change that to your desired frequency 16000Hz or 32000Hz and you should be set to go.
this is more of a quick and dirty fix and might impact audio performance in programs other than gnuradio personally I only use audio in gnuradio so I never bothered looking up a cleaner solution.
al
-----Original Message-----
From: christophe.alexandre <christophe.alexandre@cnam.fr>
To: Almohanad Fayez <alfayez@aol.com>
Cc: usrp-users <usrp-users@lists.ettus.com>
Sent: Fri, Aug 26, 2011 4:13 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
I tried both, same result. This is the
Terminal output using 32 kHz audio sample rate :
root@usrp-e1xx:~/grc# ./essai_audio.py
Press Enter to quit:
aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
Regards
C.Alexandre
I found that using "default" as the playback device and "hw:0,0" as the
capture device work best on the omap3530 processor with gnuradio.
al
-----Original Message-----
From: ALEXANDRE Christophe christophe.alexandre@cnam.fr
To: usrp-users usrp-users@lists.ettus.com
Sent: Thu, Aug 25, 2011 3:49 pm
Subject: [USRP-users] E100 : 32 kHz audio problem
Hi list,
i'm still digging in my E100 and trying to
implement an FM receiver. I can make it work,
but i realize there is still an audio problem.
i can't use 32 kHz audio rate (nor 22050). The E100 supports it,
but it only outputs noise.
i send you essai_audio.py to check it. The ouput
shows underflows which is enough strange.
i can only use 16 k, 44.1 k and 48 k.
As the E100 uses an 64 MHz clock, the 32 kHz is very usefull because
you can divide master clock by 2000 to get it.
So my FM receiver uses a 16 KHz audio rate. It works, but
i loose part of the spectrum.
any ideas are welcome !!!
Regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
USRP-users mailing list
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
if you feel like pursuing this some more in the future I would recommend you contact the ALSA listserv not the Angstrom listserv. Something you might want to keep in mind while using audio on the E100 is the digital loopback between the record and playback interface, basically if you plug something through the mic port you'll hear it on the speaker you will need amixer to set the loopback value to 0 ... in case you missed the message i emailed on the listserv a few weeks back
al fayez
-----Original Message-----
From: ALEXANDRE Christophe christophe.alexandre@cnam.fr
To: usrp-users usrp-users@lists.ettus.com; Almohanad Fayez alfayez@aol.com
Sent: Thu, Sep 8, 2011 4:48 pm
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
yes, the device supports it, but it doesn't work.
i think it's a driver problem but i'm not sure
it deserves further investigation.
tweaking angstrom can be very time consuming.
i can live without 32 kHz, using the rational resampler
and 48 kHz.
regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
----- Original Message -----
From: Almohanad Fayez
To: christophe.alexandre@cnam.fr ; usrp-users@lists.ettus.com
Sent: Thursday, September 08, 2011 10:23 PM
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
sorry for the late reply, last 2 weeks have a been a perfect storm of insanity ... anyways, I tried running my E100 based FM receiver with 32kHz and you're right it doesn't work but 16kHz work. I know that 32kHz used to work in the 2.6.29 kernel and that the audio device itself supports it ... if you really want 32kHz and you're adventurous you can poke around the driver implementation and I think there's an enum type somewhere that might fix this I can dig through my old notes to find the info though I never got it to work personally I just used the standard driver for 2.6.29 and it just worked.
al
-----Original Message-----
From: Christophe ALEXANDRE christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Sent: Sat, Aug 27, 2011 2:11 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
i hear something very noisy and the aU's output very fast.
There is nothing in my flowgraph, just a 1 kHz sinus source
plugged in an audio sink. It's just to test the E100's audio.
It playbacks correctly only at 16, 44.1 and 48 kHz.
Le 26/08/2011 22:59, Almohanad Fayez a écrit :
Are you able to hear something at least with some skipping or you can't hear anything? Are the aU's outputed to the screen very fast or are they a few at a time? It might be that the processor is not able to keep up with your data processing in the flowgraph itself and you actually need to perform some flowgraph optimization. For example a channel filter can definitely kill your runtime performance if you're not neon or dsp optimizing it.
I'll download your script and run it on my E100 but I might not get around that till early next week ...
al
-----Original Message-----
From: Christophe ALEXANDRE christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Cc: usrp-users usrp-users@lists.ettus.com
Sent: Fri, Aug 26, 2011 3:06 pm
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
in /usr/share/alsa/alsa.conf
i have changed the line :
defaults.pcm.dmix.rate 48000
to 32000 with no success. this has no effect
on my gnuradio script (even after reboot). Same output.
Le 26/08/2011 18:41, Almohanad Fayez a écrit :
aaaw, completely forgot about the the alsa.conf configuration ... so you're absolutely right the driver supports more sampling frequencies than it will allow you to do the only I figured out how to get around it is by changing the default frequency in your "alsa.conf" file, i forget the exact directory where it is. In the conf file look for default frequency ... it defaults to 48000 Hz change that to your desired frequency 16000Hz or 32000Hz and you should be set to go.
this is more of a quick and dirty fix and might impact audio performance in programs other than gnuradio personally I only use audio in gnuradio so I never bothered looking up a cleaner solution.
al
-----Original Message-----
From: christophe.alexandre christophe.alexandre@cnam.fr
To: Almohanad Fayez alfayez@aol.com
Cc: usrp-users usrp-users@lists.ettus.com
Sent: Fri, Aug 26, 2011 4:13 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
I tried both, same result. This is the
Terminal output using 32 kHz audio sample rate :
root@usrp-e1xx:~/grc# ./essai_audio.py
Press Enter to quit:
aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
Regards
C.Alexandre
I found that using "default" as the playback device and "hw:0,0" as the
capture device work best on the omap3530 processor with gnuradio.
al
-----Original Message-----
From: ALEXANDRE Christophe christophe.alexandre@cnam.fr
To: usrp-users usrp-users@lists.ettus.com
Sent: Thu, Aug 25, 2011 3:49 pm
Subject: [USRP-users] E100 : 32 kHz audio problem
Hi list,
i'm still digging in my E100 and trying to
implement an FM receiver. I can make it work,
but i realize there is still an audio problem.
i can't use 32 kHz audio rate (nor 22050). The E100 supports it,
but it only outputs noise.
i send you essai_audio.py to check it. The ouput
shows underflows which is enough strange.
i can only use 16 k, 44.1 k and 48 k.
As the E100 uses an 64 MHz clock, the 32 kHz is very usefull because
you can divide master clock by 2000 to get it.
So my FM receiver uses a 16 KHz audio rate. It works, but
i loose part of the spectrum.
any ideas are welcome !!!
Regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
USRP-users mailing list
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
--
Salutations.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
On 09/08/2011 04:48 PM, ALEXANDRE Christophe wrote:
yes, the device supports it, but it doesn't work.
i think it's a driver problem but i'm not sure
it deserves further investigation.
tweaking angstrom can be very time consuming.
i can live without 32 kHz, using the rational resampler
and 48 kHz.
I'll make a bug on the internal Ettus bugtracker to remind me to check
32 khz.
Another option is to set the fpga clock to 48 MHz. Then you can use the
48 Khz audio rate without resampling.
Philip
regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
----- Original Message -----
From: Almohanad Fayez
To: christophe.alexandre@cnam.fr ; usrp-users@lists.ettus.com
Sent: Thursday, September 08, 2011 10:23 PM
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
sorry for the late reply, last 2 weeks have a been a perfect storm of insanity ... anyways, I tried running my E100 based FM receiver with 32kHz and you're right it doesn't work but 16kHz work. I know that 32kHz used to work in the 2.6.29 kernel and that the audio device itself supports it ... if you really want 32kHz and you're adventurous you can poke around the driver implementation and I think there's an enum type somewhere that might fix this I can dig through my old notes to find the info though I never got it to work personally I just used the standard driver for 2.6.29 and it just worked.
al
-----Original Message-----
From: Christophe ALEXANDRE<christophe.alexandre@cnam.fr>
To: Almohanad Fayez<alfayez@aol.com>
Sent: Sat, Aug 27, 2011 2:11 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
i hear something very noisy and the aU's output very fast.
There is nothing in my flowgraph, just a 1 kHz sinus source
plugged in an audio sink. It's just to test the E100's audio.
It playbacks correctly only at 16, 44.1 and 48 kHz.
Le 26/08/2011 22:59, Almohanad Fayez a écrit :
Are you able to hear something at least with some skipping or you can't hear anything? Are the aU's outputed to the screen very fast or are they a few at a time? It might be that the processor is not able to keep up with your data processing in the flowgraph itself and you actually need to perform some flowgraph optimization. For example a channel filter can definitely kill your runtime performance if you're not neon or dsp optimizing it.
I'll download your script and run it on my E100 but I might not get around that till early next week ...
al
-----Original Message-----
From: Christophe ALEXANDRE<christophe.alexandre@cnam.fr>
To: Almohanad Fayez<alfayez@aol.com>
Cc: usrp-users<usrp-users@lists.ettus.com>
Sent: Fri, Aug 26, 2011 3:06 pm
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
in /usr/share/alsa/alsa.conf
i have changed the line :
defaults.pcm.dmix.rate 48000
to 32000 with no success. this has no effect
on my gnuradio script (even after reboot). Same output.
Le 26/08/2011 18:41, Almohanad Fayez a écrit :
aaaw, completely forgot about the the alsa.conf configuration ... so you're absolutely right the driver supports more sampling frequencies than it will allow you to do the only I figured out how to get around it is by changing the default frequency in your "alsa.conf" file, i forget the exact directory where it is. In the conf file look for default frequency ... it defaults to 48000 Hz change that to your desired frequency 16000Hz or 32000Hz and you should be set to go.
this is more of a quick and dirty fix and might impact audio performance in programs other than gnuradio personally I only use audio in gnuradio so I never bothered looking up a cleaner solution.
al
-----Original Message-----
From: christophe.alexandre<christophe.alexandre@cnam.fr>
To: Almohanad Fayez<alfayez@aol.com>
Cc: usrp-users<usrp-users@lists.ettus.com>
Sent: Fri, Aug 26, 2011 4:13 am
Subject: Re: [USRP-users] E100 : 32 kHz audio problem
I tried both, same result. This is the
Terminal output using 32 kHz audio sample rate :
root@usrp-e1xx:~/grc# ./essai_audio.py
Press Enter to quit:
aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
Regards
C.Alexandre
I found that using "default" as the playback device and "hw:0,0" as the
capture device work best on the omap3530 processor with gnuradio.
al
-----Original Message-----
From: ALEXANDRE Christophechristophe.alexandre@cnam.fr
To: usrp-usersusrp-users@lists.ettus.com
Sent: Thu, Aug 25, 2011 3:49 pm
Subject: [USRP-users] E100 : 32 kHz audio problem
Hi list,
i'm still digging in my E100 and trying to
implement an FM receiver. I can make it work,
but i realize there is still an audio problem.
i can't use 32 kHz audio rate (nor 22050). The E100 supports it,
but it only outputs noise.
i send you essai_audio.py to check it. The ouput
shows underflows which is enough strange.
i can only use 16 k, 44.1 k and 48 k.
As the E100 uses an 64 MHz clock, the 32 kHz is very usefull because
you can divide master clock by 2000 to get it.
So my FM receiver uses a 16 KHz audio rate. It works, but
i loose part of the spectrum.
any ideas are welcome !!!
Regards.
Christophe ALEXANDRE
Conservatoire National des Arts et Métiers (CNAM)
Laboratoire CEDRIC-LAETITIA
Département EASY
Accès 17-1-32, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : christophe.alexandre@cnam.fr
tel. 0140272699
fax. 0140272994
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