Title:
【発明の名称】信号サンプリング装置
Document Type and Number:
Japanese Patent JP2889987
Kind Code:
B2
Abstract:
An asymmetrical sideband modulated (ASM) signal, such as an RF NTSC television signal is demodulated into in-phase and quadrature phase components, each of which are sampled at a sampling rate that is less than the Nyquist rate for the components. The signals, each of which includes aliasing distortion, are respective real and imaginary parts of a complex signal that is not subject to aliasing distortion at the chosen sampling frequency. The in-phase component of the signal is recovered by inserting zero-valued samples interstitially into each of the sampled in-phase and quadrature phase signals and then applying the modified signals to a complex filter. The resultant interpolated in-phase signal is a full bandwidth signal and is substantially free of aliasing distortion.
Inventors:
TSUAIPPONGU SUTEIIBUN CHAO
Application Number:
JP14695289A
Publication Date:
May 10, 1999
Filing Date:
June 12, 1989
Export Citation:
Assignee:
AARU SHII EE TOMUSON RAISENSHINGU CORP
International Classes:
H04N5/455; H04B1/16; H04N7/26; H04N9/64; (IPC1-7): H04N5/455; H04B1/16
Attorney, Agent or Firm:
Katsunori Watanabe