Impedance matching speaker wire system
First Claim
1. An apparatus for providing an impedance matched connection between a power source and a load, the power source being operable to output signals having frequencies that are within a predetermined range, the apparatus comprising:
- a coaxial line having a predetermined characteristic impedance and including an inner conductor disposed about an axis of the coaxial line, an outer conductor disposed about the inner conductor, and an insulator disposed between the inner conductor and the outer conductor,the inner and outer conductors each having a first end electrically connectable to output terminals of the power source; and
a compensation circuit having an adjustable impedance and having a first terminal that is electrically connected to a second end of the inner conductor of the coaxial line and to a first terminal of the load and having a second terminal that is electrically connected to a second end of the outer conductor of the coaxial line and to a second terminal of the load;
the compensation circuit being sufficiently adjustable to attain, for a pulse having a rise time or a fall time associated with a further range of frequencies that is faster than those associated with the predetermined range of frequencies, a combined impedance of the compensation circuit and the load that is substantially equal to the characteristic impedance of the coaxial line.
1 Assignment
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Accused Products
Abstract
An impedance matched connection is provided between a load and a power source that outputs signals within a predetermined frequency range. A coaxial line has a predetermined characteristic impedance and an inner conductor, an outer conductor, and an insulator the two conductors. Each conductor has a first end electrically connectable to output terminals of the power source. A compensation circuit has an adjustable impedance, a first terminal electrically connected to a second end of the inner conductor and to a first terminal of the load, and a second terminal electrically connected to a second end of the outer conductor and to a second terminal of the load. The compensation circuit is sufficiently adjustable to attain, for a pulse having a rise time/fall time faster than those associated with the predetermined range of frequencies, a combined impedance and load that is substantially equal to the characteristic impedance of the coaxial line.
17 Citations
31 Claims
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1. An apparatus for providing an impedance matched connection between a power source and a load, the power source being operable to output signals having frequencies that are within a predetermined range, the apparatus comprising:
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a coaxial line having a predetermined characteristic impedance and including an inner conductor disposed about an axis of the coaxial line, an outer conductor disposed about the inner conductor, and an insulator disposed between the inner conductor and the outer conductor, the inner and outer conductors each having a first end electrically connectable to output terminals of the power source; and a compensation circuit having an adjustable impedance and having a first terminal that is electrically connected to a second end of the inner conductor of the coaxial line and to a first terminal of the load and having a second terminal that is electrically connected to a second end of the outer conductor of the coaxial line and to a second terminal of the load; the compensation circuit being sufficiently adjustable to attain, for a pulse having a rise time or a fall time associated with a further range of frequencies that is faster than those associated with the predetermined range of frequencies, a combined impedance of the compensation circuit and the load that is substantially equal to the characteristic impedance of the coaxial line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An audio system, comprising:
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a class D audio amplifier operable to output audio signals are within a range of frequencies from 20 Hz to 20 kHz, the output audio signals being formed by low-pass filtering a modulated signal comprised of a train of pulses having corresponding pulse widths, each one of the pulse widths being based on an amplitude and frequency of an input signal associated with its corresponding pulse, each one of the train of pulses having a rise time or a fall time that is faster than those associated with a further range of frequencies and being formed by comparing a switching signal and the input signal associated with that pulse, a frequency of the switching signal being at least tenfold greater than a maximum one of the range of frequencies of the output audio signals, the further range of frequencies being at least forty-fold greater than the frequency of the switching signal; a load having an impedance of about 8Ω
; andan apparatus for providing an impedance matched connection between the class D audio amplifier and the load, the apparatus comprising; a coaxial line having a predetermined characteristic impedance and including an inner conductor disposed about an axis of the coaxial line, an outer conductor disposed about the inner conductor, and an insulator disposed between the inner conductor and the outer conductor, the inner and outer conductors each having a first end electrically connectable to output terminals of the power source; and a compensation circuit having an adjustable impedance and having a first terminal that is electrically connected to a second end of the inner conductor of the coaxial line and to a first terminal of the load and having a second terminal that is electrically connected to a second end of the outer conductor of the coaxial line and to a second terminal of the load, the compensation circuit being sufficiently adjustable to attain, at the switching signal frequency or at the further range of frequencies, a combined impedance of the compensation circuit and the load that is substantially equal to the characteristic impedance of the coaxial line.
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Specification