Pulse or digital communications – Transceivers
Reexamination Certificate
2005-05-02
2009-02-03
Phu, Phuong (Department: 2611)
Pulse or digital communications
Transceivers
C375S220000, C375S229000, C375S240120, C375S240290, C704S221000, C704S219000
Reexamination Certificate
active
07486719
ABSTRACT:
A two-way conversion transcoder comprising a spectrum parameter calculation circuit that calculates a spectrum parameter for a signal produced by decoding a first code; a coefficient calculation circuit that receives the spectrum parameter and converts it to the coefficients of a band extended signal, a noise generation circuit that outputs a band-limited noise signal, a gain circuit that multiplies the output signal of the noise generation circuit by a gain, a synthesis filter circuit that receives the output signal from the noise generation circuit and the coefficients from the coefficient calculation circuit and outputs a high frequency signal for band extension, a sampling frequency conversion circuit that outputs a signal generated by up-sampling the signal to a predetermined sampling frequency, an adder that adds up a high-frequency signal and the signal to form a band extended signal, and a second encoding circuit that encodes the band extended signal by a second encoding method and outputs the encoded signal.
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NEC Corporation
Phu Phuong
Young & Thompson
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