Upsampling 2.15 2001/11/19 2005/10/18 16:23:13.190 GMT-5 Phil Schniter schniter@ee.eng.ohio-state.edu Adan Galvan jago@rice.edu Erin Maloney emaloney@rice.edu Phil Schniter schniter@ee.eng.ohio-state.edu interpolation upsampler upsampling (Blank Abstract)

Upsampling The operation of upsampling by factor L describes the insertion of L 1 zeros between every sample of the input signal. This is denoted by " ↑ L " in block diagrams, as in .

Formally, upsampling can be expressed in the time domain as y n x n L n L 0 In the z-domain, Y z n y n z n n nL x n L z n k x k z k L X z L and substituting z ω for the DTFT, Y ω X ω L As shown in , upsampling compresses the DTFT by a factor of L along with the ω axis.