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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

How do I generate the values for audio/song LUT?

Hello all,

I would like to replicate the LUT (Look Up Table) process used in Altera's synthesizer demo. There is a list of notes, or tones that get loaded and sent to the audio codec. Below is an example of what I'm talking about.

--- Quote Start ---

/////////// note list ///////////

always @(step) begin

case (step)

0:TT=8'h1f;

1:TT=8'h1a;

2:TT=8'h97;

3:TT=8'hf6;

4:TT=8'h35;

5:TT=8'h84;

6:TT=8'h13;

7:TT=8'h12;

8:TT=8'h31;

9:TT=8'h85;

10:TT=8'h36;

11:TT=8'h86;

12:TT=8'h37;

13:TT=8'h87;

14:TT=8'h3a;

15:TT=8'h8a;

16:TT=8'h8a;

17:TT=8'h87;

18:TT=8'h86;

19:TT=8'h85;

20:TT=8'h95;

21:TT=8'hf4;

22:TT=8'h83;

23:TT=8'h8a;

24:TT=8'h8a;

25:TT=8'h87;

.

.

.

53:TT=8'h83;

54:TT=8'h84;

55:TT=8'h13;

56:TT=8'h12;

57:TT=8'h21;

58:TT=8'h1f;//end

endcase

end

assign step_r=58;///Total note

--- Quote End ---

Is there an application or such that can take a .wav file or .mp3 or other format and generate similar notes.

Thanks in advance!

-Jorden

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    i would start with a MIDI file of the song you're trying to load. wav and mp3 are stored audio samples while MIDI is essentially control data, much more similar to the note list you have here.

    you will probably need to write some code to translate MIDI notes to verilog "notes".