dsP2, a tiny Library in FlexC

Reinhard

At the moment I'm dealing with integral transformations, the CORDIC is excellently suited for this. A few examples and test results are in the appendix.

SaucySoliton

Thanks! I'll be checking back here if I need a Hilbert transform for my SSB transmitter.

Using a Hilbert transform to generate a single side band signal is somewhat more computationally efficient than the Weaver method. The Weaver method uses 2 low pass filters to reject the unwanted sideband. The Hilbert filter accomplishes the same thing with one filter and a simple time delay for the other data path. In addition, the Hilbert filter has every other filter coefficient as zero, so that makes computation faster.

bob_g4bby

Hi @Reinhard , I'm new to C programming on P2 - I was trying to compile your code using FlexProp in Windows, but get some compiler errors.

"C:/flexprop/bin/flexspin" -2 -l --tabs=8 -D_BAUD=230400 -O2    --charset=utf8 -I "C:/Program Files/flexprop/include" -I "C:/Users/bobed/Documents/My Propeller code/p2-spin-standard-library-testing/library"  "C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c"
Propeller Spin/PASM Compiler 'FlexSpin' (c) 2011-2023 Total Spectrum Software Inc. and contributors
Version 6.0.4 Compiled on: Mar 22 2023
test_inversdft.c
sleep.c
fmt.c
vfs.c
posixio.c
errno.c
bufio.c
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:32: error: unknown identifier generate_sin_cos used in function call
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:32: error: Unknown symbol generate_sin_cos
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:38: error: unknown identifier dft used in function call
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:38: error: Unknown symbol dft
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:40: error: unknown identifier inversdft used in function call
C:/Users/bobed/Documents/My Propeller code/dsP2/test_inversdft.c:40: error: Unknown symbol inversdft
child process exited abnormally
Finished at Sat Mar 25 10:18:00 2023

What compiler do you use, please? I'm interested in software defined radio too.
Regards, Bob G4BBY