vsip_dvmodulate_p - Vector Modulation with Complex Carrier

Core

This manual is preliminary and incomplete.
While our Core implementation implements all functions given in the standard we are still working on completing this documentation.

Please refer to the VSIPL standard for a complete function reference of the Core profile until we have completed work on this documentation.

[next] [prev] [prev-tail] [tail] [up]

4.2.12 vsip_dvmodulate_p - Vector Modulation with Complex Carrier

vsip_scalar_f vsip_vmodulate_f(const vsip_vview_f *a, vsip_scalar_f nu, 
                              vsip_scalar_f phi, const vsip_cvview_f *r); 
vsip_cscalar_f vsip_vmodulate_f(const vsip_cvview_f *a, vsip_scalar_f nu, 
                               vsip_scalar_f phi, const vsip_cvview_f *r);

Description

This function modulates a real-valued baseband signal with a complex exponential carrier. The modulation is performed as:

j(2πνi+ϕ) ri=ai·e

for all $i$ from 0 to $n-1$ , where $n$ is the length of the vectors, $ai$ is the input signal, and $ri$ is the complex modulated output.

Parameters

const vsip_dvview_p* a: Input real vector containing the baseband signal to be modulated.
vsip_scalar_f nu: Normalized frequency of the carrier in cycles per sample, $ν$ .
vsip_scalar_f phi: Initial phase of the carrier in radians, $ϕ$ .
const vsip_cvview_p* r: Output complex vector that will store the modulated signal.

Return Value

Returns the final phase of the carrier (in radians) after modulation, which can be used for continuous phase modulation across multiple calls.

Notes

The input and output vectors must have the same length.

[next] [prev] [prev-tail] [front] [up]