a.c. Self-biased magnetoresistive reproduce head utilizing secon

Apparatus and method for demodulating data signals read from a r

Apparatus for use in recording a pulse signal on a magnetic reco

Automatic splaying picker finger

Circuit for detecting frequency modulated signal

Circuit for generating a frequency-modulated signal indicative o

Device for demodulating a frequency-modulated signal

Disk apparatus including detection of disk clamping operation

Frequency demodulation circuit

Frequency modulating and demodulating method and apparatus

Frequency-ratio apparatus

Information recording and reproducing apparatus

Inversion phenomenon preventing circuit

Magnetic card reader

Magnetic recording correction circuit for reducing interference

Modulator-demodulator for obtaining and demodulating frequency-m

Moire interference reducing circuit for FM video recorders

Noise cancelling system for low frequency analog recording

Noise reduction/elimination apparatus for use with rotary head t

Recording system with noise reduction