Texas Instruments TMS320C64X Manual de usuario Pagina 63

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 169
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 62
DSP_ifft16x32
4-35 C64x+ DSPLIB Reference
-
The FFT coefficients (twiddle factors) are generated using the program
tw_fft16x32 provided in the directory ‘support\fft’. The scale factor must be
32767.5. No scaling is done with the function; thus the input data must be
scaled by 2
log2(nx)
to completely prevent overflow.
Implementation Notes
- Bank Conflicts: No bank conflicts occur.
- Interruptibility: The code is interruptible.
- The routine uses log
4
(nx) − 1 stages of radix-4 transform and performs
either a radix-2 or radix-4 transform on the last stage depending on nx. If
nx is a power of 4, then this last stage is also a radix-4 transform, otherwise
it is a radix-2 transform.
- See the fft16x16t implementation notes, as similar ideas are used.
Benchmarks Cycles (12.5 * nx/8 + 30) * ceil[log
4
(nx) − 1] + 6 * nx/4 + 32
Codesize 864 bytes
Vista de pagina 62
1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 168 169

Comentarios a estos manuales

Sin comentarios