$HOME/PTOLEMY_SYSTEMS/C50
directory.
goertzelTest
Test the Goertzel filters for computing the discrete Fourier transform.
firTest
Test the finite impulse response (FIR) filters.
iirTest
Test the infinite impulse response (IIR) filters.
logicTest
Test various comparison tests and Boolean functions.
miscIntOps
Test integer arithmetic operations.
multiFork
Test the AnyAsmFork
star. An AnyAsmFork
star is one of a group of stars that do produce any code at compile time.
testPostTest
Test the DTMFPostTest
star used in touchtone decoding.
chirp
This system uses two integrators and a cosine to generate a chirp signal.
DTMFCodec
Demonstration of touchtone detection using the discrete Fourier transform implemented by using Goertzel filters.
lms
A noise source is connected to an eighth-order least-mean squares (LMS) adaptive filter with initial taps specifying a lowpass filter. The taps adapt to a null filter (the impulse response is an impulse) and the error signal is displayed.
lmsDTMFCodec
Demonstration of touchtone detection using Normalized Direct Frequency Estimation implemented by using Least-Mean Squares (LMS) adaptive filters.
phoneLine
A telephone channel simulator. A tone is passed through some processing which implements various distortions on a telephone channel. The parameters that are controllable are: noise, channel filter, second harmonic, third harmonic, frequency offset, phase jitter frequency, and phase jitter amplitude.
sin
A sine wave is generated by using two integrators in a feedback loop.
transmitter
A simple 4-level PAM transmitter