Waveshapes of sounds
03-Jul-92 20:06:17
Sb: #20313-Waveshapes of sounds
Fm: Ben Tubb 72057,407
To: Ilbeyi AGABEYOGLU 100037,172
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.