Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
On Thu, Mar 24, 2011 at 4:58 PM, Thomas Winter thowin...@googlemail.com wrote: Hi list, I have an 44100 Hz file with human voice, stereo with 16Bit. When convertig this to 8 kHz, mono I loose a lot of quality and have some ground noise. I tried several sox options but without success. Can somebody help I have had good results with this: sox in.wav -r 8000 -c 1 out.wav highpass 500 lowpass 4000 resample -ql Play around with the high and low pass numbers because they might need to be changed depending on the properties of your recordings. -M -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
On Thu, 2011-03-24 at 21:58 +0100, Thomas Winter wrote:
Hi list,
I have an 44100 Hz file with human voice, stereo with 16Bit.
When convertig this to 8 kHz, mono I loose a lot of quality and have
some ground noise. I tried several sox options but without success.
Can somebody help
best regards Thomas
The best results I have had have been by using the following
mpg123 -q -w ${TEMP} ${INPUT}
sox ${TEMP} -c 1 -s -r 8000 ${OUTPUT}
Regards
Ish
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Ishfaq Malik
Software Developer
PackNet Ltd
Office: 0161 660 3062
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Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
On 03/25/2011 04:58 AM, Thomas Winter wrote: Hi list, I have an 44100 Hz file with human voice, stereo with 16Bit. When convertig this to 8 kHz, mono I loose a lot of quality and have some ground noise. I tried several sox options but without success. Can somebody help best regards Thomas You really need to remove the bass end of the spectrum before downsampling to 8k/s. uLaw/ALaw sound pretty muddy and horrible if you don't do that, and the other common 8k/s codecs don't sound any better. Jean-Marc Valin wrote a little filtering utility for this purpose. Steve -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
On Fri, 25 Mar 2011, Steve Underwood wrote: You really need to remove the bass end of the spectrum before downsampling to 8k/s. uLaw/ALaw sound pretty muddy and horrible if you don't do that, and the other common 8k/s codecs don't sound any better. Jean-Marc Valin wrote a little filtering utility for this purpose. A link? Casual googling didn't yield anything promising. -- Thanks in advance, - Steve Edwards sedwa...@sedwards.com Voice: +1-760-468-3867 PST Newline Fax: +1-760-731-3000 -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] Sox and bad quality when converting to 8 kHz
Hi list, I have an 44100 Hz file with human voice, stereo with 16Bit. When convertig this to 8 kHz, mono I loose a lot of quality and have some ground noise. I tried several sox options but without success. Can somebody help best regards Thomas -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
-Original Message- From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Thomas Winter Sent: Thursday, March 24, 2011 3:59 PM To: asterisk-users@lists.digium.com Subject: [asterisk-users] Sox and bad quality when converting to 8 kHz Hi list, I have an 44100 Hz file with human voice, stereo with 16Bit. When convertig this to 8 kHz, mono I loose a lot of quality and have some ground noise. I tried several sox options but without success. Can somebody help best regards Thomas Make sure your voice talent is recording in mono or a single stereo channel. This command works for me under these conditions: Sox file44.wav -r 8000 -c 1 -s file8.wav -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Sox and bad quality when converting to 8 kHz
On Thu, 24 Mar 2011, Thomas Winter wrote:
I have an 44100 Hz file with human voice, stereo with 16Bit.
When convertig this to 8 kHz, mono I loose a lot of quality and have
some ground noise. I tried several sox options but without success.
Can somebody help
What does your command line look like?
I use this with good results:
sox ${INPUT} -c 1 -s -w -r 8000 ${OUTPUT}
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Thanks in advance,
-
Steve Edwards sedwa...@sedwards.com Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
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