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Time Frequency Toolbox >> Time Frequency Toolbox > Choice of the Instantaneous Frequency > fmpower

fmpower

Signal with power-law frequency modulation.

Calling Sequence

[X,IFLAW]=fmpower(N,K,P1)
[X,IFLAW]=fmpower(N,K,P1,P2)

Parameters

N :

number of points in time

K :

degree of the power-law (K~=1)

P1 :

if the number of input arguments (NARGIN) is 3, P1 is a vector containing the two coefficients [F0 C] for a power-law instantaneous frequency (sampling frequency is set to 1). If NARGIN=4, P1 (as P2) is a time-frequency point of the form [Ti Fi]. Ti is in seconds and Fi is a normalized frequency (between 0 and 0.5). The coefficients F0 and C are then deduced such that the frequency modulation law fits the points P1 and P2.

P2 :

same as P1 if NARGIN=4 (optional)

X :

time row vector containing the modulated signal samples

IFLAW :

instantaneous frequency law

Description

fmpower generates a signal with a power-law frequency modulation. X(t) = exp(j*2*pi(F0*t + C/(1-K)*abs(t).^(1-K)))

Examples

[X,IFLAW]=fmpower(128,0.5,[1 0.5],[100 0.1]);
subplot(211);plot(real(X));subplot(212);plot(IFLAW);

See also

Authors

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