Velocity adjusting system

Claim 2

A system as defined in claim 1 wherein said electro-mechanical transducer means comprises a permanent magnet loudspeaker having a voice coil coupled to said electrical circuit means and having a speaker cone mechanically coupled to said tracking stylus.

Claim 3

A system as defined in claim 1 wherein said means for developing a correction signal processes signals recorded in said medium and detected by said tracking stylus, said detected signals, when said record medium is moving at a predetermined velocity relative to said tracking stylus, appearing as constant frequency signals of a predetermined frequency.

Claim 4

A system as defined in claim 4 wherein said means for developing a correction signal further comprises circuit means comprising a discriminator circuit for providing a correction signal in response to said electrical signals from said tracking stylus when said relative velocity between said record medium and said tracking stylus deviates from a predetermined relative velocity.

Claim 5

A speed correction system for correcting for undesirable speed variations between a record medium and pickup means, said system comprising: electrical circuit means for detecting the speed of said record medium and for developing an error signal when said detected speed differs from a predetermined speed; electro-mechanical transducer means coupled to said electrical circuit means and mechanically coupled to said pickup means to vary the physical position of said pickup means; and said pickup means including a pickup stylus adapted to track in a groove in said record medium, and further adapted to detect signals recorded in said groove such that when the relative speed between said pickup stylus and said groove is at a predetermined level, said detected signals are of a predetermined frequency.

Claim 6

A system as defined in claim 6 wherein said record medium is a disc having a helical groove therein.

Claim 7

A system as defined in claim 6 wherein said detected signals recorded in said groove comprises horizontal synchronization signals recorded in conjunction with recorded composite television signals.

Claim 8

A system as defined in claim 6 wherein said electrical circuit means comprises a frequency discriminator circuit coupled to said pickup means and responsive to variations in the frequency of signals detected thereby to provide an error signal when the speed of the record medium relative to the pickup means differs from said predetermined speed.

Claim 9

A system as defined in claim 6 wherein said electro-mechanical transducer means comprises an electro-magnetic transducer.

Claim 10

A system as defined in claim 10 wherein said electromagnetic transducer comprises: a permaneNt magnet, an electrical winding movably mounted adjacent said permanent magnet such that as electrical current is passed through said winding motion is imparted to said winding, and mechanical means for coupling said movable winding to said pickup means.

Claim 11

In a disc recording system employing a pickup arm and pickup stylus assembly engaging a groove in a disc record for detecting information recorded in the groove of said disc, and wherein a fixed frequency reference signal is recorded in the groove of said disc, a velocity adjusting system for correcting for velocity errors between said pickup stylus and said groove comprising: circuit means for detecting said reference signals and for converting frequency deviations of said reference signal due to velocity errors into an error signal, and electro-mechanical transducer means coupled to said electrical circuit means and mechanically coupled to said pickup stylus, said transducer means responsive to said error signal from said circuit means to vary the position of said pickup stylus with respect to the groove in said disc in a manner to correct for velocity errors between said pickup stylus and said groove.

Claim 12

A system as defined in claim 12 wherein said electrical circuit means includes a frequency discriminator circuit for converting frequency deviations of said reference signal into said error signal.

Claim 13

A system as defined in claim 12 wherein said disc recording system is employed to record composite television signals and wherein said fixed frequency reference signals are horizontal synchronization signals included in said composite television signal.

Claim 14

A system as defined in claim 12 wherein said electro-mechanical transducer means comprises an electromagnetic transducer.

Claim 15

An electromagnetic transducer as defined in claim 15 comprising: a permanent magnet, an electrical winding movably mounted adjacent said permanent such that as electrical current is passed through said winding motion is imparted to said winding, and mechanical means for coupling said movable winding to said pickup stylus.