US 7,151,802 B1
High frequency content recovering method and device for over-sampled synthesized wideband signalGeneral
US 7,151,802 B1
High frequency content recovering method and device for over-sampled synthesized wideband signal
Tech Center:
2600 Communications
Examiner:
Khai Tran
Art Unit:
2611 Computer Graphic Processing, 3D Animation, Display Color Attribute, Object Processing, Hardware and Memory
Agent:
Inventors:
Bruno Bessette; Redwan Salami; Roch Lefebvre
Assignee:
Priority:
10/27/98
Filed:
10/27/99
Granted:
12/19/06
Expiration:
10/27/19
Abstract
In a method and device for recovering the high frequency content of a wideband signal previously down-sampled, and for injecting this high frequency content in an over-sampled synthesized version of the wideband signal to produce a fill-spectrum synthesized wideband signal, a random noise generator produces a noise sequence having a given spectrum. A spectral shaping unit spectrally shapes the noise sequence in relation to linear prediction filter coefficients related to the down-sampled wideband signal. A signal injection circuit finally injects the spectrally-shaped noise sequence in the over-sampled synthesized signal version to thereby produce the full-spectrum synthesized wideband signal.