A new DSP method for group delay measurement

After a review of methods available for group delay measurement and their primary errors, a digital signal processing (DSP) method with excellent accuracy is proposed. The method is described, and a comparison is made with other methods. An example using the new method is given. When compared with the methods available, the new method does not involve compromises of the frequency intervals, and it eliminates the defects caused by the assumption of linearity of phase-frequency characteristics, the calculation of the phase-frequency characteristics, and the evaluation of the difference quotient, whose measurement accuracy depends only on the hardware and software used for measurement. It has the advantages of high precision and forthright computation