Method and apparatus for recording and reproducing analog fm data without distortion

Claim 1

A METHOD FOR RECORDING AND REPRODUCING AN FM DATA SIGNAL WITHOUT DISTORTION OF THE DATA DUE TO VARIATIONS IN THE VELOCITIES OF THE RECORDING AND PLAYBACK DEVICE COMPRISING THE STEPS OF: SIMULTANEOUSLY RECORDING THE FM DATA SIGNAL AND AN FM REFERENCE SIGNAL BY MOVING A RECORDING MEDIUM PAST A PAIR OF RECORDING HEADS AT A FIRST VELOCITY CI; SIMULTANEOUSLY REPRODUCING THE FM DATA SIGNAL AND THE FM REFERENCE SIGNAL BY MOVING THE RECORDING MEIDUM PAST A PAIR OF REPRODUCING HEADS AT A SECOND VELOCITY VO SUCH THAT THE FREQUENCIES OF THE FM DATA SIGNAL AND FM REFERENCE SIGNAL WILL BE MULTIPLIED BY THE VELOCITY FACTOR VO/CVI; DEMODULATING THE REPROCUDED FM DATA SIGNAL TO PRODUCE A DEMODULATED ELECTRICAL SIGNAL REPRESENTATIVE OF THE DATA CARRIED BY THE FM DATA SIGNAL MULTIPLIED BY THE VELOCITY FACTOR VO/VI; DEMODULATING THE REPRODUCED FM REFERENCE SIGNAL TO PRODUCE A SIMILAR DEMODULATED ELECTRICAL SIGNAL REPRESENTATIVE OF THE FM REFERENCE SIGNAL MULTIPLED BY THE VELOCITY FACTOR VO/VI; AND, DIVINDING ONE OF THE DEMODULATED SIGNALS BY THE OTHER DEMODULATED SIGNAL TO ELIMINATE THE VELOCITY FACTOR AND THEREBY PROVIDE AN ELECTRICAL PROPORTIONAL TO THE DATA CARRIED BY THE FM DATA SIGNAL.

Claim 2

A METHOD FOR RECORDING AND REPRODUCING AN FM DATA SIGNAL WITHOUT DISTORTION OF THE DATA DUE TO VARIATIONS IN THE VELOCITIES OF THE RECORDING AND PLAYBACK DEVICE COMPRISING THE STEPS OF: SIMULTANEOUSLY RECORDING THE FM DATA SIGNAL AND AN FM REFERENCE SIGNAL BY MOVING A RECORDING MEDIUM PAST A PAIR OF RECORDING HEADS AT A FIRST VELOCITY CI; SIMULTANEOUSLY REPRODUCING THE FM DATA SIGNAL AND THE FM REFERENCE SIGNAL BY MOVING THE RECORDING MEIDUM PAST A PAIR OF REPRODUCING HEADS AT A SECOND VELOCITY VO SUCH THAT THE FREQUENCIES OF THE FM DATA SIGNAL AND FM REFERENCE SIGNAL WILL BE MULTIPLIED BY THE VELOCITY FACTOR VO/CVI; DEMODULATING THE REPROCUDED FM DATA SIGNAL TO PRODUCE A DEMODULATED ELECTRICAL SIGNAL REPRESENTATIVE OF THE DATA CARRIED BY THE FM DATA SIGNAL MULTIPLIED BY THE VELOCITY FACTOR VO/VI; DEMODULATING THE REPRODUCED FM REFERENCE SIGNAL TO PRODUCE A SIMILAR DEMODULATED ELECTRICAL SIGNAL REPRESENTATIVE OF THE FM REFERENCE SIGNAL MULTIPLED BY THE VELOCITY FACTOR VO/VI; AND, DIVINDING ONE OF THE DEMODULATED SIGNALS BY THE OTHER DEMODULATED SIGNAL TO ELIMINATE THE VELOCITY FACTOR AND THEREBY PROVIDE AN ELECTRICAL PROPORTIONAL TO THE DATA CARRIED BY THE FM DATA SIGNAL.