Voice and data exchange over a packet based network with voice detection

• US 7,653,536 B2
• Filed: 02/20/2007
• Issued: 01/26/2010
• Est. Priority Date: 09/20/1999
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Tackin, Onur, Branden, Scott
• Primary Examiner(s): Han; Qi
• Application Number:
  US11/676,978
• Publication Number:
  US 20070150264A1
• Time in Patent Office: 1,071 Days
• Field of Search: 704/214, 704/215, 704/217, 704/208
• US Class Current: 704/214
• 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
• 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. One or more circuits for detecting voice in a signal having first, second and third frames, the first frame preceding the second frame in time and the second frame preceding the third frame in time, the one or more circuits comprising:

at least one processor enabled to receive the signal; and

at least one storage operably coupled to and part of or external to the at least one processor, the at least one storage comprising executable code that, during operation, causes the at least one processor to, at least,

autocorrelate the signal,

estimate a characteristic of the autocorrelated signal,

detect voice in the signal as a function of the estimated characteristic, and

vacate the voice detection for the second frame if voice is not detected in both the first and the third frames.

2. The one or more circuits of claim 1 wherein the characteristic comprises pitch period.

3. The one or more circuits of claim 2 wherein the detection of voice in the signal is further based on the estimated pitch period of the autocorrelated signal being in the range of 60-400 Hz.

4. The one or more circuits of claim 3 wherein the characteristic comprises amplitude, wherein detecting voice in the signal comprises detecting the amplitude of the autocorrelated signal with one period shift and with no shift, and wherein detecting voice in the signal is further based on the amplitude of autocorrelated signal with one period shift being in the range of 0.25 to 0.40 of the amplitude of the autocorrelated signal with no shift.

5. The one or more circuits of claim 3 wherein the characteristic comprises peak amplitude, wherein detecting voice in the signal comprises detecting the peak amplitude of the autocorrelated signal with no shift and with a shift, and wherein detecting voice in the signal is further based on the peak amplitude of the shifted autocorrelated signal being less than 0.75 to 0.90 of the peak amplitude of the autocorrelated signal with no shift.

6. One or more circuits for processing a signal, the one or more circuits comprising:

at least one processor enabled to receive the signal; and

at least one storage operably coupled to and part of or external to the at least one processor, the at least one storage comprising executable code that, during operation, causes the at least one processor to, at least,

exchange data in the signal between a data device and a network;

detect voice in the signal during the data exchange;

terminate the data exchange and commence voice exchange when voice is detected in the signal;

wherein the signal comprises first, second and third frames, the first frame preceding the second frame in time and the second frame preceding the third frame in time; and

wherein detecting voice in the signal further comprises vacating the detection of voice in the signal for the second frame if voice is not detected for both the first and third frames.

7. The one or more circuits of claim 6 wherein detecting voice in the signal further comprises:

autocorrelating the signal;

estimating a characteristic of the autocorrelated signal; and

detecting voice in the signal as a function of the estimated characteristic.

8. The one or more circuits of claim 6 wherein detecting voice in the signal further comprises estimating power of the signal, and comparing the estimated power of the signal to a power threshold, and wherein detecting voice in the signal is also a function of the estimated power comparison.

9. The one or more circuits of claim 8 wherein the power threshold is in the range of −

45 to −

55 dBm.

10. The one or more circuits of claim 6 wherein the characteristic comprises pitch period.

11. The one or more circuits of claim 10 wherein detecting voice in the signal is based on an autocorrelation pitch period in the range of 60 to 400 Hz.

12. The one or more circuits of claim 11 wherein the characteristic comprises amplitude, and detecting voice in the signal further comprises detecting the amplitude of the autocorrelated signal with one period shift and with no shift, and wherein detecting voice in the signal is further based on the amplitude of autocorrelated signal with one period shift being in the range of 0.25 to 0.40 of the amplitude of the autocorrelated signal with no shift.

13. The one or more circuits of claim 11 wherein the characteristic comprises peak amplitude, and detecting voice in the signal further comprises detecting the peak amplitude of the autocorrelated signal with no shift and with a shift, and wherein detecting voice in the signal is further based on the peak amplitude of the shifted autocorrelated signal being less than 0.75 to 0.90 of the peak amplitude of the autocorrelated signal with no shift.

14. One or more circuits for processing a signal, the one or more circuits comprising:

at least one processor enabled to receive the signal; and

at least one storage operably coupled to and part of or external to the at least one processor, the at least one storage comprising executable code that, during operation, causes the at least one processor to, at least,

autocorrelate a signal having first, second and third frames, the first frame preceding the second frame in time and the second frame preceding the third frame in time; and

detect voice in the signal as a function of the autocorrelated signal, an estimated power and an estimated pitch; and

vacate the detection of voice in the signal for the second frame if voice is not detected for both the first and third frames.

15. The one or more circuits of claim 14, wherein the executable code, during operation, further causes the at least one processor to, at least:

estimate the pitch period of the autocorrelated signal; and

detect voice in the signal as a function of the estimated pitch period of the autocorrelated signal.

16. The one or more circuits of claim 15, wherein the executable code, during operation, further causes the at least one processor to, at least:

estimate the power of the signal; and

compare the estimated power of the signal to a power threshold; and

detect voice in the signal as a function of the power comparison.

17. The one or more circuits of claim 16 wherein the power threshold is in the range of −

45 to −

55 dBm, and wherein detecting voice in the signal is further based on the estimated power exceeding the power threshold.

18. The one or more circuits of claim 14 wherein detecting voice in the signal is further based on the estimated pitch period for the autocorrelated signal being in the range of 60 to 400 Hz.

19. The one or more circuits of claim 18 wherein the executable code, during operation, further causes the at least one processor to, at least,

detect an amplitude for the autocorrelated signal with one period shift and with no shift;

and

wherein detecting voice in the signal is further based on the amplitude of the autocorrelated signal with one period being in the range of 0.25 to 0.40 of the amplitude of the autocorrelated signal with no shift.

20. The one or more circuits of claim 18 wherein the executable code, during operation, further causes the at least one processor to, at least,

detect a peak amplitude of the autocorrelated signal with no shift and with a shift;

and

wherein detecting voice in the signal is further based on the peak amplitude of the shifted autocorrelated signal being less than 0.75 to 0.90 of the peak amplitude of the autocorrelated signal with no shift.