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Embedded Coder/ Embedded Targets/ Processors/ Texas Instruments C6000/ Optimization/ C64x DSP Library
The C64x Radix-8 Real FIR block filters a real input signal X using a real FIR filter. This filter is implemented using a direct form structure.
The number of input samples per channel must be a multiple of four. The filter coefficients are specified by a real vector, H. The number of coefficients must be an integer multiple of eight. The coefficients must be in reversed order — {b(n), b(n-1),...,(b(0)}. All inputs, coefficients, and outputs are Q.15 signals.
The Radix-8 Real FIR block supports discrete sample times and little-endian code generation only.
Specify the source of the filter coefficients:
Specify via dialog — Enter the coefficients in the Coefficients parameter in the dialog box
Input port — Accept the coefficients from port H. This port must have the same rate as the input data port X
Designate the filter coefficients in vector format, entering them in reversed order — b(n), b(n-1),...,(b(0). This parameter is visible when Specify via dialog is selected for the Coefficient source parameter. This parameter is tunable in simulation.
If the initial conditions are
All the same, you need only enter a scalar.
Different within channels but the same across channels, enter a vector containing the initial conditions for one channel. The length of this vector must be one less than the number of coefficients.
Different across channels, enter a matrix containing all initial conditions. The number of rows of this matrix must be one less than the number of coefficients, and the number of columns of this matrix must be equal to the number of channels.
Initial conditions must be real.
In simulation, the Radix-8 Real FIR block is equivalent to the TMS320C64x DSP Library assembly code function DSP_fir_r8. During code generation, this block calls the DSP_fir_r8 routine to produce optimized code.
C64x Complex FIR, C64x General Real FIR, C64x Radix-4 Real FIR, C64x Symmetric Real FIR
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