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US 6,219,377 B1Granted
Method and apparatus for generating tones in a multi-tone modem
AssigneeLegerity, Inc.
InventorAlfredo R. Linz
Life of this patent
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Abstract
A method and modem is provided for communicating data using a plurality of tones. The modem includes an IFFT unit capable of providing a signal comprising a plurality of tones, an interpolator capable of interpolating the signal to produce an interpolated signal, and a tone adder capable of adding a tone having a first preselected frequency and the interpolated signal to produce an output signal.
Claims22
A method for communicating with a modem, comprising:
- providing a signal from an IFFT (inverse fast fourier transform) unit of the modem;
- interpolating the signal to provide an interpolated signal;
- providing a tone;
- and
- adding the tone to the interpolated signal.
2 more elements
A modem for communicating data using a plurality of tones, comprising:
- an IFFT unit capable of providing a signal comprising a plurality of tones;
- an interpolator capable of interpolating the signal to produce an interpolated signal;
- and
- a tone adder capable of adding a tone having a first preselected frequency and the interpolated signal to produce an output signal.
1 more element
A communications system, comprising:
- a user modem capable of transmitting data using a first bandwidth formed by a first plurality of upstream tones;
- and
- a host modem coupled to the user modem and being capable of transmitting data using a second bandwidth formed by a first plurality of downstream tones, the second bandwidth being smaller than the first bandwidth;
- wherein the host modem comprises:
- an IFFT unit capable of providing a signal in time domain;
- an interpolator capable of interpolating the signal to produce an interpolated signal;
- and
- a tone adder capable of adding a tone and the interpolated signal to produce an output signal.
5 more elements
Dependencies are inferred from the claim text.