Displaying 2 results from an estimated 2 matches for "adj_stereo".
2004 Feb 03
1
Stereo mode settings
Hi everyone,
I'd like a bit of information about the stereo mode settings in
psych_44.h of libvorbis. Specifically, about the adj_stereo structure:
typedef struct {
int pre[PACKETBLOBS];
int post[PACKETBLOBS];
float kHz[PACKETBLOBS];
float lowpasskHz[PACKETBLOBS];
} adj_stereo;
What I am attempting to do is bring lossless stereo coupling down to the
lower quality levels in order to test out whether the high frequency...
2004 Feb 23
2
About lossless and point stereo
...get the
feeling that stereo coupling is rather messy in Vorbis 1.0.
My second question is about point stereo. From my understanding, in
Vorbis 1.0, at medium to low quality levels, we use a mix of lossless
stereo and point stereo for different frequency bands, depending on the
values of the adj_stereo structure. Looking at the
precomputed_couple_point function in psy.c, the last two statements:
*mag = premag * floormag;
*ang = 0.f;
eem to imply the angle (diffuse sounds) is set to zero. So point
stereo is essentially monaural, since angle=A-B so if angle is 0, A=B?
Hence Vorbis "joi...