Signal transmission in recorder systems with impedance transformation

Claim 2

In combination with a recorder system including a source of bias signal which presents an impedance which is substantially resistive for at least the frequency of said bias signal and a transducer head having a winding which presents a given value of complex impedance the improvement therewith comprising; transmission line means coupled at a first end to said transducer winding, said transmission line means having a predetermined length for transforming said complex impedance from said given value to a second value at the other end of said line, the resistive component of the second value of said complex impedance substantially matching the impedance of said bias signal source, and reactive means coupled to said bias signal source and coupled to the other end of said transmission line means, said reactive means having a reactance substantially equal and opposite to the reactive component of said second value of impedance for neutralizing the reactive component of the second value of said complex impedance.

Claim 3

The invention according to claim 1 wherein the reactive component of said second value of complex impedance is capacitive, and said reactive means is inductive.

Claim 4

The invention according to claim 1, wherein the reactive component of said second value of complex impedance is inductive, and said reactive means is capacitive.

Claim 5

In combination with a recorder system including a source of bias signal which presents an impedance which is substantially resistive for at least the frequency of said bias signal and a transducer head with a winding which presents a complex impedance, having a given value; a point of reference potential coupled to one end of said head winding, transmission line means having a center conductor and a shield, said center conductor being coupled at one end to the other end of said head winding, said shield being coupled to said point of reference potential, said transmission line having a predetermined length which at the frequency of said bias signal transforms said complex impedance from said given value to a second value having a resistive component which substantially matches the impedance of said bias signal source, and means including reactance means for coupling said bias source to the center conductor of said transmission line, said reactive means having a reactance substantially equal and opposite to the reactive component of said second value of impedance.

Claim 6

In combination with a recorder system including a source of bias signal which presents an impedance which is substantially resistive for at least the frequency of said bias signal and a transducer head with a winding which presents a complex impedance, having a given value; a point of reference potential coupled to one end of said head winding, transmission line means having a center conductor and a shield, said center conductor being coupled at one end to the other end of said head winding, said shield being coupled to said point of reference potential, said transmission line having a predetermined length which at the frequency of said bias signal transforms said complex impedance from said given value to a second value having a resistive component which substantially matches the impedance of said bias signal source, and means including reactance means for coupling said bias source to the center conductor of said transmission line, said reactive means having a reactance substantially equal and opposite to the reactive component of said second value of impedance.

Claim 7

The invention according to claim 4, wherein; said source of bias signal has first and second leads, said first lead being coupled to said point of reference potential, said second lead being coupled to one terminal of said reactive means, and a second terminal of said reactive means being coupled to the center conductor of said transmission line.

Claim 8

The invention according to claim 4, wherein; said source of bias signal has first and second leads, said first lead being coupled to said point oF reference potential, said second lead being coupled to the center conductor of said transmission line and one terminal of said reactive means, and the second terminal of said reactive means being coupled to said point of reference potential.

Claim 9

The invention according to claim 4, and further including; a length of coaxial cable coupled at one end to said bias source and coupled at its other end to said reactive means, said coaxial cable having a characteristic impedance which is substantially equal to the resistive component of the second value of said complex impedance.

Claim 10

The invention according to claim 4, and further including a source of record signal coupled to said center conductor of said transmission line means.

Claim 11

The invention according to claim 8 wherein; the coupling of said record signal source to said center conductor include bias trap means which present a low impedance to the frequency of said record signal and a high impedance to the frequency of said bias signal.

Claim 12

The invention according to claim 8, wherein; said means coupling said source of bias signal to the center conductor of said transmission line includes signal trap means which present a low impedance to the frequency of said bias signal and a high impedance to the frequency of said record signal.