search for: 18khz

...ownload from http://www.stud.uni-hannover.de/user/73884/mppenc.zip (win encoder) http://www.stud.uni-hannover.de/user/73884/in_mpp.zip (winamp plug-in) http://www.stud.uni-hannover.de/user/73884/mppdec.zip (win decoder) It sounds great! Using VBR it gives files with bitrate between 128-160kbps with 18kHz bandwidth and they are as good as AAC (Liquid Audio), maybe even slightly better!! No pre-echo and good high-frequency handling. And decoding is pretty fast too (my impression is that it is fast as mp3 decoding is), though winamp plug-in isn't quite stable. My only objection for this encoder is...

Back in the day, when I was still using LAME, I was aware of the fact that the program would cut off frequencies above a certain level (lowpass). With 192 kbps this was usually around 20Khz (which is the highest frequency a human can hear, as far as I know), and at 128 something like 16Khz. Does Vorbis do something similar? If so, does someone have a chart of the cutoffs at the different quality

...ly remember about 'too steep a cutoff gives you a lot of ripple in the passband', and other such design homilies about RC filters. What I'm looking for here are some similar guides/rules of thumb for current digital filtering apps (AFsp, specifically). PS I tested myself as having an 18kHz cutoff a few years back and I thought of using this as my cutoff but I'll keep slightly higher for when friends listen. Thanks for your time. ----------------------------------------------------- Protect yourself from spam, use http://sneakemail.com --- >8 ---- List archives: http://www....

...c. Or is that true? > > Yep, that's true ... and since Opus lowpasses at 20 kHz, if you run it at 44.1 you will always be lowpassing at 18 kHz, and you will never get grade-A quality no matter how many bits you spend. Ah yes, it low passes below Nyquist, so that's a thing. Though, 18KHz might be acceptable. > > And with Opus_custom is all that stuff recalculated? > > Yes, opus_custom adjusts its model to match the specified samplerate and frame size. So if one keeps the frame size stock (e.g. 480 samples, etc.) would it minimized the adjustments it makes? >...

Don't know if anybody is still missing the lame oggenc features for resampling, lowpass/highpass filters etc, but I wrote a little script that uses sox to do all the stuff I need to real-time encode oggenc from the radio, or any input device. #!/bin/bash DATE=`date '+%m-%d-%Y-(%H.%M)'` DESTIN=/video/music/perftoday export DATE=$DATE'-PerformanceToday.ogg' sox -V -r 44100 -c

Richard Lee wrote: > But there is a caveat. Does Vorbis coupling preserve "phase" relations? Any references explaining this in simple detail? Sebastian : >"coupling" is a rather loose term in the sense that it doesn't exactly specify HOW it's done. It can be understood as the opposite of coding channels independently. Obviously there are many ways to do

...it more usual to adopt eg "8 phase" at a lower frequency band before going to "4 phase"? Do the terms "8 phase", "4 phase", "point" still make sense when we are coupling 4 channels? Is there much advantage doing "4 phase" coupling above 18kHz only compared to "lossless" coupling of the 4 channels right up to 20kHz? __________________ Am I asking these questions in the right forum? Richard Lee -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.3/696 - Release...