Magnetic sound recording
Table of contents
1. THE CAPSTAN DRIVE
1.1. THE CAPSTAN SERVO CONTROL PRINCIPLE
1.2. TACHOMETER SYSTEMS
1.3. PHASE COMPARATORS
1.3.1. ANALOG PHASE COMPARATORS
1.3.2. DIGITAL PHASE COMPARATORS
1.4. FREQUENCY-VOLTAGE CONVERTER
1.4.1. ANALOG FREQUENCY VOLTAGE CONVERTER
1.4.2. DIGITAL FREQUENCY VOLTAGE CONVERTER
1.5. CHANGING CAPSTAN SPEEDS
1.6. DC MOTORS
1.7. DRIVING THE TAPE
2. THE TAPE TENSION CONTROL
2.1. BRAKE SYSTEMS
2.1.1. THE SERVO-BRAKE PRINCIPLE
2.2. THE PLAY TENSION
2.2.1. THE TAPE TENSION SERVO PRINCIPLE
2.2.2. TAPE TENSION FORWARD REGULATION
2.3. TAPE TENSION MEASUREMENTS
2.3.1. SUPPLY TENSION
2.3.2. TAKE-UP TENSION
2.4. THE SPOOLING TENSION
2.5. TAPE MOTION SENSORS
3. THE PRINCIPLE OF MAGNETIC RECORDING
3.1. TAPES AND TRACKS
3.2. MAGNETIZING MODES
3.3. MAGNETIC RELATIONS OF THE TAPE
4. THE RECORDING PROCESS
4.1. ERASING
4.2. FUNDAMENTAL MAGNETIC PRINCIPLES
4.3. BIASING
4.3.1. D.C. BIASING
4.3.2. HF BIASING
4.4. SETTING THE BIAS
4.4.1. THE 1KHZ METHOD.
4.4.2. THE 10KHZ METHOD
4.5. NOISE
4.5.1. TAPE NOISE
4.5.2. DC NOISE
4.5.3. MODULATION NOISE
4.6. THE RECORDING HEAD
4.7. RECORDING LOSSES
4.7.1. RECORDING HEAD LOSSES
4.7.2. SELF-DEMAGNETIZATION
4.7.3. TOTAL RECORDING LOSSES
5. THE REPRODUCE PROCESS (PLAY-BACK)
5.1. THE PRINCIPLE
5.2. THE PLAY-BACK HEAD
5.3. THE REPRODUCE LOSSES
5.3.1. THE INDUCTION LOSSES
5.3.2. THE GAP LOSSES
5.3.3. TAPE CONTACT LOSSES
5.3.4. IRON LOSSES
5.3.5. TOTAL REPRODUCE LOSSES
6. EQUALIZATION
6.1. THE STATISTICAL DISTRIBUTION OF AMPLITUDES
6.2. STANDARD FLUX CURVES
6.3. RECORDING EQUALIZATION
6.4. PLAY-BACK EQUALIZATION
6.5. THE FLUX LEVEL
6.6. TEST TAPES (CALIBRATION TAPES)
7. AUDIO ALIGNMENTS AND TESTS
7.1. DEMAGNITIZING THE TAPE MACHINE
7.2. PLAY-BACK PART ALIGNMENT
7.2.1.PLAY-BACK LEVEL ALIGNMENT
7.2.2. PLAY-BACK AZIMUTH ADJUSTMENT
7.2.3. PLAY-BACK EQUALIZATION ALIGNMENT
7.2.4. FINAL PLAY-BACK LEVEL ADJUSTMENT
7.3. RECORDING PART ALIGNMENTS
7.3.1. RECORDING HEAD AZIMUTH ADJUSTMENT
7.3.2. BIAS ADJUSTMENT
7.3.3. RECORDING LEVEL ADJUSTMENT
7.3.4. RECORDING EQUALIZATION ALIGNMENT
7.3.5. FINAL RECORDING LEVEL ADJUSTMENT
7.4. FINAL SOUND QUALITY TESTS
7.4.1. DISTORTION MEASUREMENT
7.4.2.NOISE MEASUREMENT
7.4.3. WOW AND FLUTTER MEASUREMENT
7.5. SPECIAL ALIGNMENTS
7.5.1. TRACK ALIGNMENT
7.5.2. HEAD ROTATION ALIGNMENT
7.5.3. HEAD TILT ALIGNMENT