Waveshapes of sounds
8 messages in this thread
I have written a program in AMIGABASIC for playing Turkish music.
The notes for a melody are input from the keyboard as DATA statements. The
program then plays them sequentially.
The frequencies of the notes in Turkish music are somewhat
different than those of western music. The intervals are unequal. There are
five subnotes inbetween the full notes(i.e. between do and re). I have
defined all the frequencies in the program; what I need are the waveshapes
of the sounds of various musical instruments. The help I need:
1-The published numerical values of such waveshapes. Where can I
find them?
2-Could somebody suggest me a music program, where I can define the
frequencies of the notes myself? There are lots of programs around, but I
dont know which one. Thank you for the effort!… Ilbeyi Agabeyoglu
100037,172.
you are certainly tackling a challenging project… I wish you luck! In the
meantime, I can offer a couple of suggestions:
for waveforms of musical instruments check out Massey's 'A Synthesist's
Guide To Acoustical Instruments'. I have found it to be quite useful,
although it is geared towards FM synthesis.
For a complete musical software package, look fo CMusic. I am not sure
where it can be found, but it allows non-realtime synthesis and
composition! You might also check out HMSL, which is based on the Forth
language. I've never used it, but I have heard very good things about it.
If you need futher info just let me know!
..Bill 😉
Look for the MED program in the libraries here, it includes some sampled
instruments, and coulbe useful for editing sounds also.
DEAR ARNIE, Thank you for your help. I'll try to download MED. Best
wishes… Ilbeyi
Here is a table of frequencies and notes (piano or organ notation)
OCTAVE
C0 C1 C2 C3 C4 C5 C6 C7
———————————————————————
A 27.500 55 110 220 440 880 1760 3250
A+ 29.135 58.270 116.541 233.082 466.164 932.328 1864.655 3729.310
B 30.868 61.735 123.471 246.942 493.883 987.767 1975.533 3951.066
C 32.703 65.406 130.813 261.626 523.251 1046.502 2093.005 4186.009
C+ 34.648 69.296 138.591 277.183 554.365 1107.731 2217.461
D 36.708 73.416 146.832 293.665 587.330 1174.659 2349.318
D+ 38.891 77.782 155.563 311.127 622.254 1244.508 2489.016
E 41.203 82.407 164.814 329.628 659.255 1318.510 2637.021
F 43.654 87.307 174.614 349.688 698.456 1396.913 2793.826
F+ 46.249 92.499 184.997 369.994 739.989 1479.978 2959.955
G 48.999 97.999 195.198 391.995 783.991 1567.982 3135.964
G+ 51.913 103.826 207.652 415.305 830.609 1661.219 3322.438
Notes double in frequency for each octave so you can scale this to any
frequency you want to.
Dear Benjamin, I thank you very much for your kind reply. The table which
you gave is going to be very useful for me, because this was what I was
looking for. Will try them. Actually I dont have any problem with the
frequencies, but need the amplitude values of various instruments as DATA
statements. Will try and study your numbers in detail and will let you know
where i get. Best wishes… Ilbeyi
Ilbeyi,
If you need the amplitude values of instruments in DATA statements (for
BASIC?) then perhaps a book of Hammond organ drawbar harmonic's setting
values could help you compute those values by using the generic equation
SUM = SUM + A*COS(theta) + B*COS(theta/2) + C*COS(theta/3) … etc. where
A, B, B … are the successive harmonics defined in the book (e.g. a Violin
can be defined as harmonic series amplitudes (in hex) of ACE20402, a Banjo
as 26ACCC04, etc.). Such values can be graphed by ploting theta over a
range of degrees as 0 to 180 – where the harmonic amplitude sums can be
appropriately scaled for use by Digital to Analogue (DAC) converters.
Ben P.S. a definitive resource book is "Dictionary of Hammond Organ Stops
(A Translation of Pipe-Organ Stops Into Hammond-Organ Number Arrangements:
An Introduction to Playing the Hammond Organ) by Stevens Irwin, Revised
Fourth Edition, 1970, Schirmer Books, ISBN 0-02-871110-6.
Dear Ben,
Thank you for the much needed information. Your suggestions hit the
mark! I have already tried the trigonometric functions with some success.
The point is that, one has to try many combinations. I have checked maybe
30-40 different trig function exactly at the same format of equation(series
terms). Some of them turned out to be good, some not so good. If I can
obtain somebody else's tried data, that would save me time. Your suggestion
was most timely. I'll try to get that book. I'll either try THE MALL on
Compuserve, or maybe some other source. I am planning to come over to
Orlando/Florida by the end of month for a scientific meeting. I'll devote
some time for bookstores as well. If not, I can always ask the publisher.
Anyhow, thank you for the well placed help! Best wishes… Ilbeyi