Unlike FIR filters, IIR filters use feedback (past output values) to compute current outputs. This allows them to achieve much sharper filtering characteristics with significantly fewer coefficients than an FIR filter, saving memory and CPU cycles. However, they can become unstable if not designed carefully. 3. The Fast Fourier Transform (FFT)
: Implementation of Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) filters, often used for noise removal and signal enhancement. digital media processing dsp algorithms using c pdf
Many university courses provide lecture notes and source code focusing on implementing FIR filters and FFT algorithms using C for digital media. 5. Summary Unlike FIR filters, IIR filters use feedback (past
C code maps closely to assembly language, making it easier for compilers to optimize code for specific CPU architectures. Unlike FIR filters
In Q15 format, a 16-bit signed integer represents fractional numbers between -1.0 and 0.9999. Multiplying two Q15 numbers requires a 32-bit intermediate variable and a bit-shift: