search for: tobark

Could someone point me to the BARK/MEL tables that these macros (from vorbis/scales.h) are trying to approximate? #define toBARK(f) (13.1*atan(.00074*(f))+2.24*atan((f)*(f)*1.85e-8)+1e-4*(f)) #define fromBARK(z) (102.*(z)-2.*pow(z,2.)+.4*pow(z,3)+pow(1.46,z)-1.) #define toMEL(f) (log(1.+(f)*.001)*1442.695) #define fromMEL(m) (1000.*exp((m)/1442.695)-1000.) I was wondering if I could come up with different functions...

Hi, It is better to replace this line in function filterbank_new: max_mel = toBARK(EXTRACT16(MULT16_16_Q15(QCONST16(.5f,15),sampling))); to max_mel = toBARK(EXTRACT16(sampling/2)); It gives the same but it seems to be faster and avoids overflow on 44100 kHz that prevents denoiser to process 44100 streams. (Yes I know that Speex should not pack 44100 streams but it does now and...

Hi All, I need some clarifications regarding the mismatch I found in the code and the specification. (a) In the specification, the bark(x) equation is given as: bark(x) = 13.1 atan(.00074x) + 2.24 atan(.0000000158(x^2)) + .0001x whereas in the code it is given as: #define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n)) Which one of these is the proper one ? (b) Also, we are planning to implement a fixed point code for the Vorbis decoder. And as usual the obvious criteria is the compliance and how accurately this fixed point code should generate...

I have a small feature request for oggenc: Can a command line option be added to allow the user to set the first serial number to be used for the output ogg stream? This only takes a few lines of code, actually. Rationale: it is quite helpful for debugging other encoders. If oggenc is the "reference" encoder, ensuring that your new whiz-bang encoder has diffable output to oggenc is a

...ARK function described in the Vorbis specification and its implementation in libvorbis. In the specificationhttp://xiph.org/vorbis/doc/Vorbis_I_spec.pdf bark(x) = 13.1arctan(.00074x) + 2.24arctan(.0000000185x**2 + .0001x) In the libvorbis code http://svn.xiph.org/trunk/vorbis/lib/scales.h #define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n)) You will note that the last term is inside the parentheses of the second arctan function in the specification but outside in the libvorbis implementation. This results in extremely large differences at high frequencies. Which is...

Hello to everyone! During building speex library for Symbian OS I encountered some problems. All thess problems can be solved by modifying the speex sources. I don't have access to SVN repository of speex, so I will just describe the changes to be done: 1) mmp file in symbian derictory misses windows.c sources. You need to add this string into speex.mmp: SOURCES windows.c 2) Symbian OS

...libspeex/filterbank.c Thu Nov 22 14:20:03 2007 @@ -53,7 +53,7 @@ FilterBank *filterbank_new(int banks, spx_word32_t sampling, int len, int type) { - FilterBank *bank; + FilterBank *bnk; spx_word32_t df; spx_word32_t max_mel, mel_interval; int i; @@ -63,16 +63,16 @@ max_mel = toBARK(EXTRACT16(sampling/2)); mel_interval = PDIV32(max_mel,banks-1); - bank = (FilterBank*)speex_alloc(sizeof(FilterBank)); - bank->nb_banks = banks; - bank->len = len; - bank->bank_left = (int*)speex_alloc(len*sizeof(int)); - bank->bank_right = (int*)speex_alloc(len*sizeo...