Ryoji Okita

Noise canceling method and apparatus

Communication line backup system

Multiplex transmission system wherein analog signal is transformed to base band, random-transformed and superimposed on dispersed signal points in vector signal space

Transmission apparatus having echo cancellation facility

Simultaneous transmission of data and analog voice-band signals

Automatic equalizer with a branched input for improved accuracy

Data transmission system having a backup testing facility

Error correction device and error correction method

Equalization processing method and the apparatus for periodic fluctuation of transmission line characteristic

Apparatus and method of recovering a timing signal in a transmission apparatus by adjusting tap coefficients