Signal Processing Toolbox Major Bug Fixes

FDATool Memory Leak Fixed

A memory leak while using the FDATool graphical user interface has been fixed.

Fixed Segmentation Violation in buffer Function

Previously, a segmentation fault occured for the buffer function with the nodelay option when the overlap equaled the length of signal. This has been fixed.

Fixes to cremez Function

A number of fixes have been made to cremez, which has been renamed to cfirpm:

• Correct results for odd order highpass and bandstop filters are now produced.
• Using the hilbfilt flag now produces correct results.
• Using the invsinc option uses a default gain argument if 'defaults' is specified.
• Odd and even cases now return a real-valued result and even-ordered cases do not cause an error.
• The fresp function, when called by cremez, defaults to 'none' if no default SYM is specified.
• Using a 'real' flag now produces a real-valued impulse response.

Fixes to remez Function

A number of fixes have been made to remez, which has been renamed to firpm:

• The function's robustness has been improved. The design now converges for many edge cases that used to have convergence problems. When the design does not converge, an error message, with tips on how to modify the specifications to try to attain convergencence, is displayed.
• firpm now requires odd-order symmetric filters to have zero gain at the Nyquist frequency only if the last frequency point is equal to 1. If your filter does not have zero gain at the Nyquist frequency, you can either make the order even or use an 'h' flag to prevent the filter order from being incremented and design a Type 4 filter.

Segmentation Violation Fixed in upfirdn resample

There was a bug in upfirdn, which manifested itself in resample, that caused segmentation violations. This bug has been fixed.

Using Large Data Sets with upfirdn and resample

upfirdn and resample no longer cause a segmentation fault when processing large data sets.