Modem for communicating data over a voice channel of a communications system
First Claim
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1. A modulator for modulating data, said modulator comprising:
- an encoder configured to select at least one frequency from at least three or more candidate frequencies and configured to store combinations of two or more frequencies composed of three or more candidate frequencies, wherein said encoder outputs a plurality of signals substantially simultaneously to at least two oscillators to produce respective oscillation signals; and
a computational element in communication with said at least two oscillators and configured to receive the respective oscillation signals and produce a modulated audio signal based on the respective oscillation signals, wherein the respective oscillation signals are the same in number for each modulated audio signal.
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Abstract
A modem used for communicating data. The modem may include a packet generator and modulator. The modulator may include an electronic device configured to select at least one frequency from at least three or more candidate frequencies. At least one oscillator may be in communication with the electronic device and configured to generate respective oscillation signals in response to receiving the frequency(s) from the electronic device. A computational element may be in communication with the oscillator(s) and be configured to receive the oscillation signal(s) and produce a modulated audio signal based on the oscillation signal(s).
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Citations
12 Claims
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1. A modulator for modulating data, said modulator comprising:
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an encoder configured to select at least one frequency from at least three or more candidate frequencies and configured to store combinations of two or more frequencies composed of three or more candidate frequencies, wherein said encoder outputs a plurality of signals substantially simultaneously to at least two oscillators to produce respective oscillation signals; and a computational element in communication with said at least two oscillators and configured to receive the respective oscillation signals and produce a modulated audio signal based on the respective oscillation signals, wherein the respective oscillation signals are the same in number for each modulated audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A modem, comprising:
a modulator including; an encoder configured to select at least one frequency from at least three or more candidate frequencies and configured to store combinations of two or more frequencies composed of three or more candidate frequencies, said encoder includes an encoder table having at least 256 entries of candidate frequency combinations; at least one oscillator in communication with said encoder and configured to generate respective oscillation signals in response to receiving the two or more frequencies from said encoder; and a computational element in communication with said at least one oscillator and configured to receive the respective oscillation signals and produce a modulated audio signal based on the respective oscillation signal, wherein the respective oscillation signals are the same in number for each modulated audio signal. - View Dependent Claims (11, 12)
Specification