Frequency modulated magnetic recording and reproducing system

• US 3,350,504 A
• Filed: 08/10/1964
• Issued: 10/31/1967
• Est. Priority Date: 08/10/1964
• Status: Expired due to Term

• Current Assignee: Kenjiro Takayanagi
• Original Assignee: Kenjiro Takayanagi
• Inventors: KENJIRO TAKAYANAGI
• Application Number:
  US04/388,611
• Time in Patent Office: 1,177 Days
• US Class Current: 360/30
• CPC Class Codes: H04N 5/92 Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Claims

1. IN A SIGNAL TRANSLATING SYSTEM, MEANS FOR SUPPLYING A FREQUENCY MODULATED CARRIER SIGNAL VARYING IN FREQUENCY BETWEEN LOWER AND UPPER FREQUENCY LIMITS, MEANS FOR CONVERTING SAID FREQUENCY MODULATED CARRIER SIGNAL TO AN AMPLITUDE MODULATED SIGNAL, AND DETECTOR MEANS RESPONSIVE TO SAID AMPLITUDE MODULATED SIGNAL FOR PRODUCING AN OUTPUT SIGNAL HAVING AMPLITUDE LIMITS RESPECTIVELY CORRESPONDING TO SAID FREQUENCY LIMITS AND HAVING A MAXIMUM FREQUENCY HIGHER THAN SAID LOWER FREQUENCY LIMIT OF SAID FREQUENCY MODULATED CARRIER SIGNAL.

9. IN A MAGNETIC RECORDING SYSTEM FOR RECORDING TELEVISION VIDEO SIGNALS OR ANY OTHER WIDE-BAND SIGNALS ON A MAGNETIC MEDIUM, OSCILLATOR MEANS PRODUCING A FIRST SIGNAL AT A FIRST FREQUENCY AND INCLUDING A TRANSISTOR, MODULATOR MEANS FOR MODULATING THE FREQUENCY OF SAID OSCILLATOR MEANS AND INCLUDING DIODE MEANS IN CIRCUIT WITH SAID TRANSISTOR, AMPLIFIER MEANS FOR APPLYING AN AMPLIFIED INPUT SIGNAL TO SAID DIODE MEANS TO VARY THE EFFECTIVE REACTANCE THEREOF AND TO CONTROL THE FREQUENCY OF OPERATION OF SAID OSCILLATOR MEANS TO PRODUCE A FIRST FREQUENCY MODULATED CARRIER SIGNAL, SAID INPUT SIGNAL HAVING A FREQUENCY RANGE EXTENDING FROM A RELATIVELY LOW FREQUENCY TO A CERTAIN MAXIMUM FREQUENCY WITH SAID FIRST FREQUENCY BEING SUBSTANTIALLY HIGHER THAN SAID CERTAIN MAXIMUM FRE-