Hi All:
I found the signal level will be dropped about -14dB after applied the
PresetReverb with "small room" while playing mp3 file.
So, I enabled the LVM_PCM @ EffercReverb.h to record input/output pcm
data into SD card and compared the singal level of input and output.
After studying the source code in ReverbBlock( ) @ LVREV_Process.c, it
will reserve 12dB
headroom before processing the reverb effect
Mult3s_32x16(pIn,
(LVM_INT16)LVREV_HEADROOM,
pTemp,
(LVM_INT16)NumSamples);
But I can’t find the code which compensate the 12dB back.
I think it’s the reason why the signal level is dropped.
Now I compensate the 12dB back in the last of ReverBlock()
/* Apply Gain*/
Shift_Sat_v32xv32 (LVREV_OUTPUTGAIN_SHIFT,
pOutput,
pOutput,
size);
Just change the definition of LVREV_OUTPUTGAIN_SHIFT from 5 to 7, and
it sounds great.
Is my patch right ?
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