Voice and data exchange over a packet based network with resource management

• US 6,990,195 B1
• Filed: 08/23/2000
• Issued: 01/24/2006
• Est. Priority Date: 09/20/1999
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Stevenson, Shawn, LeBlanc, Wilf
• Primary Examiner(s): Swerdlow, Daniel
• Application Number:
  US09/643,921
• Time in Patent Office: 1,980 Days
• Field of Search: 370/286, 37940601-40616, 718/104, 718/105
• US Class Current: 379/406.08
• CPC Class Codes: G10L 25/90 Pitch determination of speech signals
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04B 3/234 using double talk detection
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2012/5671 Support of voice
• CPC Class Codes: H04L 2012/6481 Speech, voice
• CPC Class Codes: H04L 2027/0028 at passband only
• CPC Class Codes: H04L 2027/0034 using hypothesis testing
• CPC Class Codes: H04L 2027/0053 Closed loops
• CPC Class Codes: H04L 25/03044 using fractionally spaced delay lines or combinations of fractionally integrally spaced taps
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/11 Identifying congestion
• CPC Class Codes: H04L 47/263 Rate modification at the source after receiving feedback
• CPC Class Codes: H04L 47/28 in relation to timing considerations
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 65/1026 at the edge
• CPC Class Codes: H04L 65/103 : in the network
• CPC Class Codes: H04L 65/1036 : at the edge
• CPC Class Codes: H04L 65/104 : in the network
• CPC Class Codes: H04L 65/1043 : Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1069 : Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 : Session protocols
• CPC Class Codes: H04L 65/70 : Media network packetisation
• CPC Class Codes: H04L 65/80 : Responding to QoS
• CPC Class Codes: H04L 67/61 : taking into account QoS or priority requirements
• CPC Class Codes: H04L 69/329 : in the application layer [OSI layer 7]
• CPC Class Codes: H04L 7/027 : extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
• CPC Class Codes: H04L 7/0278 : Band edge detection
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04M 11/062 : using different frequency bands for speech and other data
• CPC Class Codes: H04M 2201/40 : using speech recognition speech recognition per se G10L15/00
• CPC Class Codes: H04M 2201/52 : Telephonic communication in combination with fax communication
• CPC Class Codes: H04M 2203/2027 : Live party detection
• CPC Class Codes: H04M 2203/2066 : Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP
• CPC Class Codes: H04M 3/002 : Applications of echo suppressors or cancellers in telephonic connections in two-way loud-speaking telephone systems H04M9/08, echo suppressors or cancellers per se H04B3/20
• CPC Class Codes: H04M 3/2209 : for lines also used for data transmission
• CPC Class Codes: H04M 3/2272 : Subscriber line supervision circuits, e.g. call detection circuits
• CPC Class Codes: H04M 7/006 : Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/0069 : comprising a residential gateway, e.g. those which provide an adapter for POTS or ISDN terminals
• CPC Class Codes: H04M 7/125 : Details of gateway equipment
• CPC Class Codes: H04Q 1/45 : using multi-frequency signalling H04Q1/46 takes precedence
• CPC Class Codes: Y02D 30/50 : in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A signal processing system which discriminates between voice signals and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a call discriminator. The voice exchange is capable of exchanging voice signals between a switched circuit network and a packet based network. The signal processing system also includes a data exchange capable of exchanging data signals modulated by a voiceband carrier on the switched circuit network with unmodulated data signal packets on the packet based network. The data exchange is performed by demodulating data signals from the switched circuit network for transmission on the packet based network, and modulating data signal packets from the packet based network for transmission on the switched circuit network. The call discriminator is used to selectively enable the voice exchange and data exchange.

Claims

1. A method of managing resources of a system, comprising:

processing a signal;

estimating signal processing complexity; and

adjusting adaptation speed of an echo canceller for processing the signal, when the estimated complexity exceeds a threshold, wherein the signal processing comprises adaptively canceling the echos from the signal, and the estimating signal processing complexity comprises estimating echo return loss enhancement (ERLE) of the echo canceller.

2. The method of claim 1 further comprising bypassing the echo canceller and suppressing echo of the signal by an echo suppressor instead, when the estimated complexity exceeds a threshold.

3. The method of claim 1 wherein the estimating signal processing complexity comprises estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

4. A method of managing resources of a system, comprising:

performing a plurality of signal processing functions on a signal, including echo cancellation function;

estimating average complexity of each of the signal processing functions;

summing the estimated average complexity of the each of the signal processing functions; and

adjusting adaptation speed of the echo cancellation function, when the sum of the estimated average complexities exceeds a threshold, wherein the estimating signal processing complexity comprises estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

5. The method of claim 4 further comprising bypassing the echo cancellation function and suppressing echo of the signal by an echo suppressor instead, when the sum of the estimated average complexities exceeds a threshold.

6. The method of claim 4 wherein adjusting adaptation speed of the echo cancellation function comprises reducing the complexity of the echo cancellation adaption.

7. A data transmission system, comprising:

a telephony device which outputs a signal; and

a signal processor coupled to the telephony device, the signal processor comprising a resource manager that estimates signal processor complexity based on characteristics of the signal, and adjusts adaptation speed of an echo canceller for processing the signal by changing the number of coefficients of the echo canceller, when the estimated complexity exceeds a threshold, wherein the resource manager estimates signal processor complexity by estimating echo return loss enhancement (ERLE) of the echo canceller.

8. The data transmission system of claim 7 wherein the signal processor comprises an echo suppressor, and the resource manager reduces the signal processor complexity by bypassing the echo canceller and suppressing echo of the signal by the echo suppressor instead, when the estimated complexity exceeds a threshold.

9. The data transmission system of claim 7 wherein the resource manager estimates maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

10. A resource manager for a signal processor, comprising:

estimation means for estimating signal processor complexity based on characteristics of the signal; and

adjusting means for adjusting adaptation speed of an echo canceller for processing the signal by changing the number of coefficients of the echo canceller, when the estimated complexity exceeds a threshold, wherein the estimation means comprises means for estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

11. The resource manager of claim 10 further comprising echo suppressing means, and wherein the adjusting means comprises means for bypassing the echo canceller and suppressing echo of the signal by the echo suppression means instead, when the estimated complexity exceeds a threshold.

12. A resource manager for a signal processor performing a plurality of functions including echo cancellation function, comprising:

estimation means for estimating average complexity of each of the functions by comparing a first signal to a second signal;

summing means for summing the estimated average complexity of each of the functions; and

adjusting means adjusting adaptation speed of the echo cancellation function by changing the number of coefficients of an echo canceller, when the sum of the estimated average complexities exceeds a threshold, wherein the adjusting means comprises means for estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

13. The resource manager of claim 12 further comprising echo suppress means, and wherein the adjusting means comprises means for bypassing the echo canceller and suppressing echo of the signal by the echo suppressing means instead, when the estimated complexity exceeds a threshold.

14. Computer-readable media embodying a program of instructions executable by a computer to perform a method of managing resources of a signal processing system, the method comprising:

estimating signal processing complexity based on characteristics of the signal; and

adjusting adaptation speed of an echo canceller for processing the signal by changing the number of coefficients of the echo canceller, when the estimated complexity exceeds a threshold, wherein the estimating signal processing complexity comprises estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

15. The computer-readable media of claim 14 further comprising instructions for bypassing the echo canceller and suppressing echo of the signal by an echo suppressor instead, when the estimated complexity exceeds a threshold.

16. Computer-readable media embodying a program of instructions executable by a computer to perform a method of managing resources of a system which performs a plurality of signal processing functions including echo cancellation function on a signal, the method comprising:

estimating average complexity of each of the signal processing functions by comparing a first signal to a second signal;

summing the estimated average complexity of the each of the signal processing functions; and

adjusting adaptation speed of the echo cancellation function by changing the number of coefficients of the echo canceller, when the sum of the estimated average complexities exceeds a threshold, wherein said estimating signal processing complexity comprises estimating maximum power level of a reference signal, long term average power of an error signal, and long term average power of a near end signal.

17. The computer-readable media of claim 16 further comprising instructions for bypassing the echo cancellation function and suppressing echo of the signal by an echo suppressor instead, when the sum of the estimated average complexities exceeds a threshold.

18. The computer-readable media of claim 16 wherein the adjusting adaptation speed of the echo cancellation function comprises reducing the complexity of the echo cancellation adaption.