|  Frequency Table |
Programming/Audio
| -- Note -- | Frequency (Hz) | NTSC TED Value | NTSC TED Value (hex) | PAL TED Value | PAL TED Value (hex) | | A6 | 1760 | 960 | $03C0 | 961 | $03C1 | | G#6 | 1661 | 957 | $03BD | 957 | $03BD | | G6 | 1568 | 953 | $03B9 | 953 | $03B9 | | F#6 | 1480 | 948 | $03B4 | 949 | $03B5 | | F6 | 1397 | 944 | $03B0 | 945 | $03B1 | | E6 | 1319 | 939 | $03AB | 940 | $03AC | | D#6 | 1245 | 934 | $03A6 | 935 | $03A7 | | D6 | 1175 | 929 | $03A1 | 930 | $03A2 | | C#6 | 1109 | 923 | $039B | 924 | $039C | | C6 | 1047 | 917 | $0395 | 918 | $0396 | | B5 | 988 | 911 | $038F | 912 | $0390 | | A#5 | 932 | 904 | $0388 | 905 | $0389 | | A5 | 880 | 897 | $0381 | 898 | $0382 | | G#5 | 831 | 889 | $0379 | 891 | $037B | | G5 | 784 | 881 | $0371 | 883 | $0373 | | F#5 | 740 | 873 | $0369 | 874 | $036A | | F5 | 698 | 864 | $0360 | 865 | $0361 | | E5 | 659 | 854 | $0356 | 856 | $0358 | | D#5 | 622 | 844 | $034C | 846 | $034E | | D5 | 587 | 834 | $0342 | 835 | $0343 | | C#5 | 554 | 822 | $0336 | 824 | $0338 | | C5 | 523 | 810 | $032A | 812 | $032C | | B4 | 494 | 798 | $031E | 800 | $0320 | | A#4 | 466 | 784 | $0310 | 786 | $0312 | | A4 | 440 | 770 | $0302 | 772 | $0304 | | G#4 | 415 | 755 | $02F3 | 757 | $02F5 | | G4 | 392 | 739 | $02E3 | 741 | $02E5 | | F#4 | 370 | 722 | $02D2 | 724 | $02D4 | | F4 | 349 | 704 | $02C0 | 707 | $02C3 | | E4 | 330 | 685 | $02AD | 688 | $02B0 | | D#4 | 311 | 664 | $0298 | 668 | $029C | | D4 | 294 | 643 | $0283 | 646 | $0286 | | C#4 | 277 | 620 | $026C | 624 | $0270 | | C4 | 262 | 596 | $0254 | 600 | $0258 | | B3 | 247 | 571 | $023B | 575 | $023F | | A#3 | 233 | 544 | $0220 | 548 | $0224 | | A3 | 220 | 516 | $0204 | 520 | $0208 | | G#3 | 208 | 485 | $01E5 | 490 | $01EA | | G3 | 196 | 453 | $01C5 | 458 | $01CA | | F#3 | 185 | 419 | $01A3 | 425 | $01A9 | | F3 | 175 | 383 | $017F | 389 | $0185 | | E3 | 165 | 345 | $0159 | 351 | $015F | | D#3 | 156 | 305 | $0131 | 311 | $0137 | | D3 | 147 | 262 | $0106 | 269 | $010D | | C#3 | 139 | 217 | $00D9 | 224 | $00E0 | | C3 | 131 | 169 | $00A9 | 177 | $00B1 | | B2 | 123 | 118 | $0076 | 126 | $007E | | A#2 | 117 | 64 | $0040 | 73 | $0049 | | A2 | 110 | 7 | $0007 | 16 | $0010 |
The values in this table can be printed with the following BASIC program:
0 D=1.0594631:F=440*4
1 V=1024-(111860.781/F)
2 PRINTINT(F+.5);INT(V+.5);
3 F=F/D
4 IFF>=110THEN1
Note: change 111860.781 is the NTSC value. Use 110840.4375 for PAL.
The formula was taken from Commodore Plus/4 User's Manual, page 204, where a similar table appears. The value for PAL is mistakenly printed as "111840" instead of "110840".
You can use these values in the SOUND statement. For example, to play a C major chord (consisting of notes C, E, G - or do, mi, sol) on an NTSC machine, type the following:
VOL8:SOUND1,810,3:SOUND1,854,3:SOUND1,881,3
Freq table |
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