← Back to Patent Explorer
US6567399B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Hi-fidelity line card

Assignee: HP Inc
•
Filing: 1999-05-05
•
Granted: 2003-05-20
•
Expires: 2019-05-05
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A high-fidelity voice/audio communication system including a high-fidelity SLIC (HSLIC) device that combines traditional BORSCHT functionality with high fidelity sampling and compression techniques. The HSLIC preferably resides on a single plug-in line card contained within a multi-cards chassis. The line card includes an analog interface that connects to a two-wire subscriber line, a high fidelity codec for sampling the analog signal at a high resolution and converting high rate digital signals to an analog signal, a voice processing client running on a microprocessor and associated digital memory. The high fidelity codec preferably has a sample rate of at least twenty thousand samples per second, and no less that 250 quantization levels. The voice processing client preferably includes an Internet Protocol (IP) processing client, Session Initiation Protocol (SIP) client, a Real Time Protocol (RTP) client, and other components of a communication protocol stack for establishing a connection over a packet based network by way of the network interface circuit. The line card establishes a high fidelity audio connection by sending an invite request to a proxy server; receiving an okay signal indicating that the request was received; sending an acknowledge signal; quantizing audio information at a sampling rate greater than twenty thousand samples per second with a resolution of no less than 4096 quantization levels; and, packetizing the quantized data for transmission to a remote device.

Inventors

  • 👤 Guido Schuster
  • 👤 Ikhlaq Sidhu
  • 👤 Jerry Mahler
  • 👤 Jacek Grabiec

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 19:16
CPC Classifications
H; H04; H04L; H04L65/00; H04L65/1066; H04L65/1069; H04L65/1101; H04L65/1104; H04L65/60; H04L65/70; H04M; H04M3/00; H04M3/005; H04M3/007; H04M7/00; H04M7/12; H04M7/1205; H04M7/125

Claims Analysis

Total Claims: 16
Claim 1
Independent Claim 112 words
A line card apparatus comprising: an analog interface adapted for connection to a two-wire subscriber line for providing call progression signals; a high fidelity codec connected to said analog interface; a voice processing client including a microprocessor, said client connected to said analog interface and to said high fidelity codec; said client further comprising a digital memory connected to said microprocessor having program instructions to direct said microprocessor to accept data from said high fidelity codec and to form data packets; a network interface circuit connected to said client and adapted for connection to a communication network, wherein said network interface circuit enables transmission of said data packets to the communication network.
Claim 2
Dependent Claim 112 words
A line card apparatus comprising: an analog interface adapted for connection to a two-wire subscriber line for providing call progression signals; a high fidelity codec connected to said analog interface; a voice processing client including a microprocessor, said client connected to said analog interface and to said high fidelity codec; said client further comprising a digital memory connected to said microprocessor having program instructions to direct said microprocessor to accept data from said high fidelity codec and to form data packets; a network interface circuit connected to said client and adapted for connection to a communication network, wherein said network interface circuit enables transmission of said data packets to the communication network.
Claim 3
Dependent Claim 23 words
The line card of claim 1 wherein said high fidelity codec has a sample rate of at least twenty thousand samples per second.
Claim 4
Dependent Claim 18 words
The line card of claim 1 wherein said high fidelity codec has no less than 4096 quantization levels.
Claim 5
Dependent Claim 17 words
The line card of claim 1 wherein said voice processing client includes an Internet Protocol processing client.
Claim 6
Dependent Claim 17 words
The line card of claim 1 wherein said voice processing client includes a Session Initiation Protocol client.
Claim 7
Dependent Claim 31 words
The line card of claim 1 wherein said voice processing client includes a protocol stack for establishing a connection over a packet based network by way of said network interface circuit.
Claim 8
Dependent Claim 23 words
The line card of claim 1 wherein said analog interface circuit provides line voltage and signals to operate a standard POTS subscriber device.
Claim 9
Dependent Claim 16 words
The line card of claim 7 wherein said standard POTS subscriber device provides enhanced frequency characteristics.
Claim 10
Dependent Claim 13 words
The line card of claim 1 wherein said packets contain compressed data samples.
Claim 11
Dependent Claim 17 words
The line card of claim 1 wherein said voice processing client includes a Real Time Protocol client.
Claim 12
Dependent Claim 27 words
The line card of claim 1 wherein said line card has associated with it a plurality of configuration parameters, said parameters including codec type and IP address.
Claim 13
Independent Claim 74 words
A method of establishing a high fidelity audio connection comprising the steps of: sending an invite request to a called party over a communication network; receiving an okay signal indicating that the request was received; sending an acknowledge signal; quantizing audio information at a sampling rate greater than twenty thousand samples per second with a resolution of no less than 4096 quantization levels; and, packetizing the quantized information for transmission to a remote device.
Claim 14
Independent Claim 74 words
A method of establishing a high fidelity audio connection comprising the steps of: sending an invite request to a called party over a communication network; receiving an okay signal indicating that the request was received; sending an acknowledge signal; quantizing audio information at a sampling rate greater than twenty thousand samples per second with a resolution of no less than 4096 quantization levels; and, packetizing the quantized information for transmission to a remote device.
Claim 15
Dependent Claim 22 words
The method of claim 12 further comprising the step of querying a proxy server to obtain an address of the called party.
Claim 16
Dependent Claim 32 words
The method of claim 13 wherein the query includes information regarding the called party's identity, said information being one of the following: a SIP address, a phone number, and an email address.

References Cited (Backward Citations)

US5689534A Cited
US6199076B1 Cited
US6128317A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2006-05-19 2006-11-18 2007-05-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2010-05-19 2010-11-18 2011-05-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2014-05-19 2014-11-18 2015-05-20 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag