High speed encoding and decoding apparatus and method for analog subscriber connections

• US 6,690,749 B2
• Filed: 03/18/2002
• Issued: 02/10/2004
• Est. Priority Date: 12/09/1994
• Status: Expired due to Term

• Current Assignee: Townshend Intellectual Property LLC
• Original Assignee: Townshend Intellectual Property LLC
• Inventors: Townshend, Brent
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US10/100,430
• Publication Number:
  US 20020136285A1
• Time in Patent Office: 694 Days
• Field of Search: 375/222, 375/242, 375/244, 375/245, 375/259, 375/316, 375/340, 379/93.01, 370/523
• US Class Current: 375/340
• CPC Class Codes: H04L 25/4917 using multilevel codes
• CPC Class Codes: H04L 25/4927 using levels matched to the quantisation levels of the channel
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 7/0029 interpolation of received data signal
• CPC Class Codes: H04M 11/00 Telephonic communication systems specially adapted for combination with other electrical systems
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04Q 11/00 Selecting arrangements for multiplex systems multiplex systems H04J
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 11/0435 Details
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13036 Serial/parallel conversion, parallel bit transmission
• CPC Class Codes: H04Q 2213/1305 Software aspects
• CPC Class Codes: H04Q 2213/13054 Expert system
• CPC Class Codes: H04Q 2213/1309 Apparatus individually associated with a subscriber line, line circuits
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13107 Control equipment for a part of the connection, distributed control, co-processing
• CPC Class Codes: H04Q 2213/13174 Data transmission, file transfer
• CPC Class Codes: H04Q 2213/13179 Fax, still picture
• CPC Class Codes: H04Q 2213/1319 Amplifier, attenuation circuit, echo suppressor
• CPC Class Codes: H04Q 2213/13199 : Modem, modulation
• CPC Class Codes: H04Q 2213/13202 : Network termination [NT]
• CPC Class Codes: H04Q 2213/13204 : Protocols
• CPC Class Codes: H04Q 2213/13209 : ISDN
• CPC Class Codes: H04Q 2213/13292 : Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13299 : Bus
• CPC Class Codes: H04Q 2213/1332 : Logic circuits
• CPC Class Codes: H04Q 2213/13337 : Picturephone, videotelephony
• CPC Class Codes: H04Q 2213/1336 : Synchronisation
• CPC Class Codes: H04Q 2213/13385 : Off-net subscriber
• CPC Class Codes: H04Q 2213/13396 : Signaling in general, in-band signalling

Abstract

A signal processor programmed with a set of instructions to perform a data transfer decoding method. The method includes receiving an analog signal representing a sequence of codewords. The analog signal is converted into the sequence of codewords. Each codeword in the sequence of codewords is selected from a predetermined set of digital network codewords. A high speed data transfer decoder, including a signal processor and memory is also provided.

Claims

1. A high speed data transfer decoder for recovering a digital data stream from an analog signal transmitted to said decoder from a digital telephone network interface via an analog local loop connected to said decoder, comprising:

a signal processor; and

a memory coupled to the signal processor, the memory storing a set of instructions that are executed by the signal processor to generate a sequence of codewords from the analog signal, wherein each codeword in said sequence of codewords is associated with a codeword utilized by said digital telephone network.

2. The high speed data transfer decoder as claimed in claim 1, wherein said codewords utilized by said digital telephone network correspond to a set of quantization values applied in a line interface that couples said digital telephone network to said analog loop.

3. The high speed data transfer decoder as claimed in claim 1, wherein said instructions cause said signal processor to apply a linear-to-mu.-law converter to said analog signal.

4. The high speed data transfer decoder as claimed in claim 1, wherein said signal processor converts said sequence of codewords into said digital data stream.

5. The high speed data transfer decoder as claimed in claim 4, wherein converting said sequence of codewords into said digital data stream comprises a parallel-to-serial conversion.

6. A signal processor programmed with a set of instructions to perform a data transfer decoding method, said method comprising the steps of:

receiving an analog signal representing a sequence of codewords; and

converting said analog signal into said sequence of codewords, wherein each codeword in the sequence of codewords is selected from a predetermined set of digital network codewords.

7. The signal as claimed in claim 6, wherein said digital network codewords correspond to a set of quantization values.

8. The signal processor as claimed in claim 7, wherein said quantization values are mu.-law quantization values utilized by said digital network.

9. The signal processor as claimed in claim 6, wherein said signal processor converts said sequence of codewords into a digital data stream.

10. The signal processor as claimed in claim 9 wherein converting said sequence of codewords into said digital data stream comprises a parallel-to-serial conversion.