Hello Munir,
You are not supposed to use 'throttle' blocks if the rate of the flowgraph is already limited by attached hardware (ex: USRP src /sink, audio source / sink). As Derek mentioned, this is probably due to the two-clock problem of the system. Try inserting a few seconds of delays to the audio stream by using a "Delay" block right before the Audio Sink - if this slows down the occurance of the problem, then it is likely caused by the clock mismatch. See: https://www.google.com/search?q=two-clock+problem+GNU+Radio Regards, Kyeong Su Shin ________________________________ 보낸 사람: Muhammad Munir via USRP-users <usrp-users@lists.ettus.com> 대신 USRP-users <usrp-users-boun...@lists.ettus.com> 보낸 날짜: 2018년 7월 27일 금요일 오후 1:40:42 받는 사람: Derek Kozel 참조: usrp-users 제목: Re: [USRP-users] ALSA audio problem Hi Derek, Thanks for the response. The answer to your question "Do you have a throttle block or a piece of hardware?" is that I used USRP N200 hardware to get data. I also placed throttle block as well. I checked on different possible sample rate of sound card. The problem is whenever I run the same program on 8 core CPU, it works fine. I changed the motherboard as well. It is working fine with 8 core processor on any motherboard; but create choppy sound on 12 core processor. Munir On Tue, Jul 24, 2018 at 7:47 PM, Derek Kozel <derek.ko...@ettus.com<mailto:derek.ko...@ettus.com>> wrote: Hello Mr Munir, Yes, GNU Radio will work with a 12 core CPU. Problems with the audio sink are usually a clock crossing issue. Your sound card is running at a slightly different sample rate than whatever the source of your samples is. Do you have a throttle block or a piece of hardware such as a radio which is the source of the samples GNU Radio is processing? Derek On Mon, Jul 9, 2018 at 11:11 AM, Muhammad Munir via USRP-users <usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> wrote: Dear All, I am facing problem with audio sink block on Gnuradio. When I run application, there is a clear sound for about 8 to 10 minutes. After that sound becomes choppy with knocking sound. I tried different sample rate including 16kHz, 24kHz, 44.1kHz, 48kHz, and 96kHz with appropreate resampling. When I record .wav file the signal during that choppy sound and play it in player , it playback with no error. I am using Core i7 8th Generation 12 core processor. I have attached a picture. When i test the sound application in sound setting, it shows a flickering of ALSA plug-in [Python 2.7]. My queries are i. Is it a problem with sound card of the motherboard? ii. Does Gnuradio version 3.7.10 supported at 12 core processor? because when I run the same application at 8 core processor, it has no issue of audio. iii. Suggest solutions to this problem. Regards, M. Munir _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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