Version 6.6 (R2006b) Signal Processing Toolbox Software

This table summarizes what is new in Version 6.6 (R2006b):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems
Yes Details below	Yes — Details labeled as Compatibility Considerations, below. See also Summary.	Bug Reports Includes fixes

New features and changes introduced in this version are

• Frequency Vector Input Added to Spectral Analysis Functions

• FFT Length in Spectral Analyses Changed

• sosfilt and dfilt filter Method Support Multidimensional Array Input

• dfilt block Method Supports Target Subsystem Destination and Link Between Command Line and Model

• gaussfir Algorithm Updated

Frequency Vector Input Added to Spectral Analysis Functions

The spectral analysis command line functions (pburg, pcov, peig, periodogram, pmcov, pmtm, pmusic, pwelch, and pyulear) now accept a frequency vector as an input parameter. This vector identifies the frequencies at which the spectral analysis function returns an estimate.

For functions that use the Goertzel algorithm (periodogram, pmtm, pwelch, and spectrogram), the frequency inputs are rounded to match the nearest bin value used by the algorithm.

FFT Length in Spectral Analyses Changed

The FFTLength parameter has been removed from all spectrum objects and you now specify the number of FFT points (NFFT) via the psd, msspectrum, or pseudospectrum estimation method. The NFFT value can be an integer or a string (either 'Nextpow2' or 'Auto'). 'Nextpow2' is the default and sets the number of FFT points to the next power of 2 greater than the input signal length (or the segment length for spectrum.welch objects). 'Auto' sets the number of FFT points to be equal to the input signal or segment length.

Compatibility Considerations

You should update any existing code that specifies the FFTLength parameter and instead use the NFFT parameter associated with an estimation method.

You should also verify that any spectrum.welch objects are using the desired FFT length, since the FFT length is now based on the segment length instead of the input signal length.

sosfilt and dfilt filter Method Support Multidimensional Array Input

You can now input a multidimensional array to sosfilt and to the dfilt filter method.

dfilt block Method Supports Target Subsystem Destination and Link Between Command Line and Model

The dfilt block method now allows you to specify a target subsystem in your Simulink model where you want to place the block. Two new parameters implement this: 'Destination' and 'Link2Obj'. The 'Destination' specifies where to place the block and 'Link2Obj' creates a link between the block in your model and inputs from the command line.

gaussfir Algorithm Updated

The alpha parameter in the formula used in gaussfir has been updated to match the formula in Rappaport T.S., Wireless Communications Principles and Practice, 2nd Edition, Prentice Hall, 2001.

Version 6.7 (R2007a) Signal Processing Toolbox Software

Version 6.5 (R2006a) Signal Processing Toolbox Software

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