Pulse or digital communications – Transmitters
Reexamination Certificate
2006-05-02
2006-05-02
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transmitters
C375S324000, C375S344000, C375S323000, C370S410000, C370S349000, C708S323000
Reexamination Certificate
active
07039123
ABSTRACT:
A demodulation method, and apparatus, for reproducing data from a received signal. The demodulation method includes the steps of: receiving a signal including a series of frames each containing a training signal for automatic equalization processing and a data signal; controlling an amplitude of the received signal by AGC processing so as to make the amplitude a predetermined level; conducting demodulation processing on the signal subjected to the AGC processing; periodically conducting automatic equalization processing so as to adapt the modulated signal to characteristics of the signal transmission path based on each training signal of the frame; and setting values of a time constant of the AGC processing and an update repetition period of the automatic equalization processing so as to satisfy a predetermined relation.
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Ando Hiroyuki
Hirose Nobuo
Kokuryo Yoshiro
Kondo Kunihiko
Chin Stephen
Hitachi Koksusai Electric, Inc.
Zheng Eva
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