PCM/WAV output to PSG

Champion (457)

29-12-2011, 12:27

Hello guys, Wikipedia says

Quote:

In 2006 two MSX developers created an advanced encoder that converts a wave file to optimal PSG channel transitions using Viterbi search.

Is there source code available? Anyone knows those guys?

By mars2000you

Prophet (2646)

29-12-2011, 12:35

Check here :

http://www.dvik-joyrex.com/tools.html

Go to PCM Encoder ! ;)

By Google

By Eugeny_Brychkov

Champion (457)

29-12-2011, 14:20

I am trying to get wav file processed - have it 8 bit mono, in versions 44kHz, 22kHz, 11kHz and 5.5kHz. For any file pcmenc says

Encoding PSG samples at 11047Hz

Failed to load wav file: ___.wav

44kHz file size is 16.8MiB, 11kHz - 4.21MiB.

By mars2000you

Prophet (2646)

29-12-2011, 14:22

Maybe it's just a problem with the name of the wav file ...

By ARTRAG

Prophet (3870)

29-12-2011, 14:30

what commandline parameters do you pass?

By Eugeny_Brychkov

Champion (457)

29-12-2011, 15:07

no parameters. I looked through the readme, and think exe reads file config from the its wav record. What should I specify?

Edit: here's the wav file header
00000000 52 49 46 46 24 A6 1B 02 57 41 56 45 66 6D 74 20
00000010 10 00 00 00 01 00 01 00 11 2B 00 00 11 2B 00 00
00000020 01 00 08 00 64 61 74 61 C0 74 43 00

By ARTRAG

Prophet (3870)

29-12-2011, 15:43

IIRC you have to specify the timing of you replayer
The sampling period of the input has to match the sum of the 3 phases (dt1+dt2+dt3)
Try -dt1 32 -dt2 27 -dt3 266 for input at 11kHz

By Eugeny_Brychkov

Champion (457)

29-12-2011, 15:58

Thanks. Now output is little different - frequency is less 34 Hz

Encoding PSG samples at 11013Hz
Failed to load wav file: bd.wav

By ARTRAG

Prophet (3870)

29-12-2011, 22:30

I just tested on my wav files: the header is

0x52,0x49,0x46,0x46,0xD6,0x7B,0x02,0x00,0x57,0x41,0x56,0x45,0x66,0x6D,0x74,0x20,
0x12,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x11,0x2B,0x00,0x00,0x22,0x56,0x00,0x00,
0x02,0x00,0x10,0x00,0x00,0x00,0x66,0x61,0x63,0x74,0x04,0x00,0x00,0x00,0xD2,0x3D

and my encoder works perfectly.
Here follows dump of the terminal screen:

C:\Documents and Settings\PC\Documenti\msx\pcmenc>pcmenc -rto 1 aaaaaaa.wav
Encoding PSG samples at 11047Hz
Viterbi SNR optimization:
   1 input samples per PSG tripplet output
   dt1 = 156 (Normalized: 0.481)
   dt2 = 27 (Normalized: 0.083)
   dt3 = 141 (Normalized: 0.435)
   Resampling using Lagrange interpolation on 11 points
   Using cost function: L2
Processing 100.00%

The cost metric in Viterbi is about 11.511

SNR is about 22.86
Encoding samples for original player

C:\Documents and Settings\PC\Documenti\msx\pcmenc>

Send me one of you wav files and I'll try to see why they do not work with the pcm encoder

By Gradius2

Champion (370)