Back to results
US 2003/0223484 A1Published application
DSL Modem apparatus and initialization method for DSL communication
AssigneePanasonic Communications Co., Ltd.
InventorsTakashi Suzuki, Motoyoshi Nagai
Life of this patent
Estimating the term…
Abstract
An ADSL modem apparatus including an IFFT unit that performs an inverse fast Fourier transform on transmission data, an FFT unit that performs a fast Fourier transform on reception data, and a processor that performs an initialization sequence according to a protocol, is provided. During the initialization sequence, the processor maintains and enables an interleave memory to be employed. After data transmission is initiated, the processor instructs a switch controller so that an interleave unit and de-interleave unit can use the interleave memory.
Claims10
A DSL modem apparatus comprising:
- a modulator that modulates data;
- a converter that calculates an initial signal for transmission upon initiating an initialization sequence and converts individual initial signal into a signal pattern for modulation;
- a memory that stores the signal pattern of the initial signal during SHOWTIME;
- and
- an input unit that reads out the corresponding signal pattern from said memory when it is time for transmission of the initial signal during the initialization sequence and inputs the signal pattern to said modulator.
2 more elements
A DSL modem apparatus comprising:
- a retriever that retrieves a specific initial signal from demodulation data of a received signal during an initialization sequence;
- a memory that is used for processing data during SHOWTIME;
- a calculator that calculates for adjusting reception timing based on the retrieved initial signal, said memory being used as a work area for the calculation;
- and
- an adjustor that adjusts reception timing based on the calculation result.
2 more elements
A DSL modem apparatus comprising:
- a converter that calculates an initial signal for reception upon initiating an initialization sequence and converts individual initial signal into a signal pattern for demodulation;
- a memory that stores the signal pattern of the initial signal during SHOWTIME;
- and
- an identifier that compares demodulation data of the initial signal received during the initialization sequence and signal pattern of an initial signal for reception stored in said memory, and identifies a type of the initial signal that is just received.
1 more element
A DSL modem apparatus comprising:
- an IFFT unit that performs an inverse Fourier transform on transmission data;
- an FFT unit that performs a Fourier transform on reception data;
- a processor that executes an initialization sequence according to a protocol;
- an interleave unit that interleaves transmission data to be input to said IFFT unit after data transmission is initiated;
- a de-interleave unit that de-interleaves reception data being output from said FFT unit after data transmission is initiated;
- an interleave memory that is used to open data upon interleaving and/or de-interleaving;
- and
- a switch controller that enables said processor to maintain said interleave memory at a usable state during the initialization sequence, and said interleave unit and/or said de-interleave unit to maintain said interleave memory at a usable state after the data transmission is initiated.
5 more elements
A DSL modem apparatus comprising:
- a memory that opens data in order to interleave and/or de-interleave the data;
- a calculator that performs data transmission related calculation within said memory, prior to interleaving and/or de-interleaving the data;
- and
- a switch controller that performs a switch control on said memory in order to enable said memory to open data for interleaving and/or de-interleaving.
1 more element
An initialization method for DSL communication comprising:
- calculating an initial signal for transmission upon initiating an initialization sequence;
- converting individual initial signal into a signal pattern for modulation;
- storing the signal pattern of the initial signal during SHOWTIME within a memory to be used for processing data;
- and
- reading out the corresponding signal pattern from the memory when it is time for a transmission of the initial signal during the initialization sequence, and inputting the signal pattern to a modulator.
2 more elements
An initialization method DSL communication comprising:
- retrieving a specific initial signal from demodulation data of a received signal during an initialization sequence;
- calculating for adjusting reception timing based on the retrieved initial signal by utilizing a memory that is used for processing data during SHOWTIME, as a work area;
- and
- adjusting reception timing based on the calculation result.
1 more element
An initialization method DSL communication comprising:
- calculating an initial signal for transmission upon initiating an initialization sequence;
- converting individual initial signal into a signal pattern for modulation;
- storing the signal pattern of the initial signal during SHOWTIME within a memory to be used for processing data;
- and
- comparing demodulation data of the initial signal received during the initialization sequence and signal pattern of tan initial signal for reception stored in the memory, and identifying a type of the initial signal that is just received.
2 more elements
Dependencies are inferred from the claim text.