5.3.4 vsip_vcreate_hanning_p - Create a Hanning Window Vector

vsip_vview_f* vsip_vcreate_hanning_f(vsip_length n, vsip_memory_hint hint);

Description

This function creates and initializes a vector with coefficients of a Hanning window (also known as Hann window) of length . The Hanning window is defined by:

Parameters

• vsip_length n: Length of the window (number of elements in the vector).

• vsip_memory_hint hint: Memory allocation hint:

  • VSIP_MEM_NONE - No memory hint

  • VSIP_MEM_RDONLY - The memory is to be used read-only

  • VSIP_MEM_CONST - The memory will hold constants

  • VSIP_MEM_SHARED - The memory will be shared

  • VSIP_MEM_SHARED_RDONLY - The memory will be shared and is read-only

  • VSIP_MEM_SHARED_CONST - The memory will be shared and will hold constants

Return Value

• On success, returns a pointer to the newly created and initialized vector containing the Hanning window coefficients.

• On error (e.g., if memory allocation fails), returns NULL.

Example

vsip_vview_f *hanning_win; 
vsip_length n = 64; 
 
// Create a Hanning window 
hanning_win = vsip_vcreate_hanning_f(n, VSIP_MEM_NONE); 
 
if (hanning_win == NULL) { 
    // Handle error 
} 
 
// Print first 5 coefficients 
printf("First 5 Hanning window coefficients:\n"); 
for (int i = 0; i < 5; i++) { 
    printf("%f\n", vsip_vget_f(hanning_win, i)); 
} 
 
// Use the window in a signal processing application 
// For example, apply it to a signal vector 
vsip_vview_f *signal = vsip_vcreate_f(n, VSIP_MEM_NONE); 
vsip_vview_f *windowed_signal = vsip_vcreate_f(n, VSIP_MEM_NONE); 
 
// Initialize signal with some values (e.g., a sine wave) 
// vsip_vramp_f(0.0f, 1.0f, signal); 
 
// Apply the window: windowed_signal = signal * hanning_win 
vsip_vmul_f(signal, hanning_win, windowed_signal); 
 
// Clean up 
vsip_valldestroy_f(hanning_win); 
vsip_valldestroy_f(signal); 
vsip_valldestroy_f(windowed_signal);

Notes

• The Hanning window is symmetric for even-length vectors and nearly symmetric for odd-length vectors.