Frequency converter system
First Claim
1. A method of converting an input signal having frequency related information reproduced over a first time period to an output signal having substantially the same frequency related information reproduced over a second, different time period,said method comprising determining the ratio between the second time period and first time period and then altering the alpha length of one or more contiguous signal blocks to alter the output signal by said ratio.
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Abstract
An apparatus and method is disclosed for converting an input signal having frequency related information sustained over a first duration of time into an output signal sustained over a second duration of time at substantially the same first frequency by adding or subtracting to the effective wave length of the output signal. Preferably, the signals are converted in digital form with samples added or subtracted to frequency convert the signal.
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Citations
24 Claims
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1. A method of converting an input signal having frequency related information reproduced over a first time period to an output signal having substantially the same frequency related information reproduced over a second, different time period,
said method comprising determining the ratio between the second time period and first time period and then altering the alpha length of one or more contiguous signal blocks to alter the output signal by said ratio.
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12. An apparatus for converting an input signal having frequency related information reproduced over a first time period to an output signal having substantially the same frequency related information reproduced over a second, different time period,
said apparatus comprising means for determining the ratio between the second time period and first time period and means for altering the alpha length of one or more contiguous signal blocks to alter the output signal by said ratio.
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23. A method of converting an input signal having frequency related information reproduced over a first time period to an output signal having substantially the same frequency related information reproduced over a second, different time period,
said method comprising getting the input signal, over sampling said input signal through an over sampling digital coding scheme device to produce a first set of digital samples, determining the difference ratio between the second time period and the first time period, modifying said first set of said digital samples in a signal modification circuit in accord with said difference ratio to produce a second set of digital samples, converting said second set of digital samples to produce an output signal having an alpha length altered in the signal modification circuit by said difference ratio, and remitting said output signal.
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24. An apparatus for converting an input signal having frequency related information reproduced over a first time period to an output signal having substantially the same frequency related information reproduced over a second, different time period,
said apparatus comprising means to get an input signal, means for over sampling said input signal through an over sampling digital coding scheme device to produce a first set of digital samples, means for determining the ratio between the second time period and the first time period, means for modifying said first set of said digital samples in a signal modification circuit in accord with said difference ratio to produce a second set of digital samples, means for converting said second set of digital samples to produce an output signal having an alpha length altered in the signal modification circuit by said difference ratio, and remitting said output signal.
Specification