Abstract
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5G,4G,3G,2G | 06/01/2010 | ISLD-201001-018 | VOICEAGE CORPORATION |
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Specification Information
Specification Information
Technologies
Family Information
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All Pending Patents In Patent Family : | ---- |
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Technologies

Product


Use Cases


Services

Claim
(1-727) where 0
(1-vzâx84¢H where 0
(1-Y,2 ") where 0
1. A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal in order to reduce a difference between a weighted wideband signal and a subsequently synthesized weighted wideband signal, said perceptual weighting device comprising: a) a signal preemphasis filter responsive to the wideband signal for enhancing a high frequency content of the wideband signal to thereby produce a preemphasised signal; b) a synthesis filter calculator responsive to said preemphasised signal for producing synthesis filter coefficients; and c) a perceptual weighting filter, responsive to said preemphasised . signal and said synthesis filter coefficients, for filtering said preemphasised signal in relation to said synthesis filter coefficients to thereby produce said perceptually weighted signal, said perceptual weighting filter having a transfer function with fixed denominator whereby weighting of said wideband signal in a formant region is substantially decoupled from a spectral tilt of said wideband signal.
2. A perceptual weighting device as defined in claim 1, wherein said signal preemphasis filter has a transfer function of the form: P(z) =1 - pz wherein u is a preemphasis factor having a value located between 0 and1.
3. A perceptual weighting device as defined in claim 2, wherein said preemphasis factor i is 0.7.
4. A perceptual weighting device as defined in claim 2, wherein said perceptual weighting filter has a transfer function of the form: Wi) =4 EY)! (A-v,z7h) where 0
5. A perceptual weighting device as defined in claim 4, wherein v, is set } equal to uu.
6. A perceptual weighting device as defined in claim 1, wherein said perceptual weighting filter has a transfer function of the form: Wz) =4 @v)/! (A-v,z7h) where 0
7. A perceptual weighting device as defined in claim 6, wherein v, is set equal to Lt.
8. A method for producing a perceptually weighted signal in response to a wideband signal in order to reduce a difference between a weighted wideband signal and a subsequently synthesized weighted wideband signal, said method comprising: a) filtering the wideband signal to produce a preemphasised signal with enhanced high frequency content: b) calculating, from said preemphasised signal, synthesis filter coefficients; and c) filtering said preemphasised signal in relation to said synthesis filter coefficients to thereby produce a perceptually weighted speech signal, wherein said filtering comprises processing the preemphasis signal through a perceptual weighting filter having a transfer function with fixed denominator whereby weighting of said wideband signal in a formant region is substantially decoupled from a spectral tilt of said wideband signal.
9. A method for producing a perceptually weighted signal as defined in claim 8, wherein filtering the wideband signal comprises filtering through a transfer function of the form: Pz) =1 - pz! wherein 1 is a preemphasis factor having a value located between 0 and1
10. A method for producing a perceptually weighted signal as defined in claim 9, wherein said preemphasis factor 1 is 0.7
11. A method for producing a perceptually weighted signal as defined in claim 9, wherein said perceptual weighting filter has a transfer function of the form: WE) = 4 Gy) A-vzâx84¢) where 0
12. A method for producing a perceptually weighted signal as defined in claim 11, wherein vy, is set equal to w
13. A method for producing a perceptually weighted signal as defined in claim 8, wherein said perceptual weighting filter has a transfer function of the form: WE) =A Ey)! A-Y,27 where 0
14. A method for producing a perceptually weighted signal as defined in claim 13, wherein v, is set equal to .
15. An encoder for encoding a wideband signal, comprising: a) a perceptual weighting device as recited in claim 1;', 'b) an pitch codebook search device responsive to said perceptually weighted signal for producing pitch codebook parameters and an innovative search target vector; c) an innovative codebook search device, responsive to said synthesis filter coefficients and to said innovative search target vector, for producing innovative codebook parameters; and d) a signal forming device for producing an encoded wideband signal comprising said pitch codebook parameters, said innovative codebook parameters, and said synthesis filter coefficients
16. An encoder as defined in claim 15, wherein said signal preemphasis filter has a transfer function of the form: Pz) =1 - pz! wherein i is a preemphasis factor having a valiie located between 0 and1
17. An encoder as defined in claim 16, wherein said preemphasis factor1. is 0.7
18. An encoder as defined in claim 16, wherein said perceptual weighting filter has a transfer function of the form: Wz) = 4 (z/v)
19. An encoder as defined in claim 18, wherein vy, is set equal to u.
20. An encoder as defined in claim 15, wherein said perceptual weighting filter has a transfer function of the form: Wz) =A4 @Y)/! A-Y,z 7) where 0< ¥,<¥,< 1and y, and Y, are weighting control values.
21. An encoder as defined in claim 20, wherein is set equal to v,. }
22. A cellular communication system for servicing a large geographical area divided into a plurality of cells, comprising: a) mobile transmitter/receiver units; b) cellular base stations respectively situated in said cells; c) a control terminal for controlling communication between the cellular base stations; d) a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising, in both the mobile unit and the cellular base station:', 'i) a transmitter including an encoder for encoding a wideband signal as recited in claim 15 and a transmission circuit for transmitting the encoded wideband signal; and ii) a receiver including a receiving circuit for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal.
23. A cellular communication system as defined in claim 22, wherein said signal preemphasis filter has a transfer function of the form: Pz) =1 - pz" wherein 1 is a preemphasis factor having a value located between 0 and1. :
24. A cellular communication system as defined in claim 23, wherein said : preemphasis factor we is 0.7.
25. A cellular communication system as defined in claim 23, wherein said perceptual weighting filter has a transfer function of the form: Wz) =A (27)
26. A cellular communication system as defined in claim 25, wherein 1 is set equal to v,.
27. A cellular communication system as defined in claim 22, wherein said perceptual weighting filter has a transfer function of the form; Wz) = 4 (@Y,)/ (1-Y,z7Y) where 0
28. A cellular communication system as defined in claim 27, wherein vy, is } set equal to pi.
29. A cellular mobile transmitter/receiver unit comprising: a) a transmitter including an encoder for encoding a wideband signal as recited in claim 15 and a transmission circuit for transmitting the encoded wideband signal; and b) a receiver including a receiving circuit for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal.
30. A cellular mobile transmitter/receiver unit as defined in claim 29, wherein said signal preemphasis filter has a transfer function of the form: P(z) =1 - pz wherein1. is a preemphasis factor having a value located between 0 and1.
31. A cellular mobile transmitter/receiver unit as defined in claim 30, wherein said preemphasis factor 1 is 0.7.
32. A cellular mobiie transmitter/receiver unit as defined in claim 30, wherein said perceptual weighting filter has a transfer function of the form: Wz) = 4 (2/y) 1 (1~Y,z 7H where 0
33. A cellular mobile transmitter/receiver unit as defined in claim 32, wherein', 'Y. is set equal to i.
34. A cellular mobile transmitter/receiver unit as defined in claim 29, wherein said perceptual weighting filter has a transfer function of the form: Wz) = 4 (zy) / (1-7Y,2 7) where 0
35. A cellular mobile transmitter/receiver unit as defined in claim 34, wherein Y, is set equal to wu.
36. A cellular network element comprising: a) a transmitter including an encoder for encoding a wideband signal as defined in claim 15 and a transmission circuit for transmitting the encoded wideband signal; and b) a receiver including a receiving circuit for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal.
37. A cellular network element as defined in claim 36, wherein said signal preemphasis filter has a transfer function of the form: Pz) =1 - pz! wherein L is a preemphasis factor having a value located between 0 and1.
38. A cellular network element as defined in claim 37, wherein said preemphasis factor wis 0.7.
39. A cellular network element as defined in claim 37, wherein said perceptual weighting filter has a transfer function of the form: Wz) =4 @zv)! -v,z7h) : where O
40. A cellular network element as defined in claim 39, wherein v, is set equal to L.
41. A cellular network element as defined in claim 36, wherein said perceptual weighting filter has a transfer function of the form; Wi) =4@v)/!/ A-yz" where 0
42. A cellular network element as defined in claim 41, wherein u is set equal to v..
43. In a cellular communication system for servicing a large geographical area divided into a plurality of cells, comprising: mobile transmitter/receiver units; cellular base stations, respectively situated in said cells; and control terminal for controlling communication between the cellular base stations: a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising, in both the mobile unit and the cellular base station: a) a transmitter including an encoder for encoding a wideband signal as recited in claim 15 and a transmission circuit for transmitting the encoded wideband signai; and b) a receiver including a receiving circuit for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal.
44, A bidirectional wireless communication sub-system as defined in claim 43, wherein said signal preemphasis filter has a transfer function of the form: Pz) =1 - pz! wherein wu is a preemphasis factor having a value located between 0 and1.
45. A bidirectional wireless communication sub-system as defined in claim 44, wherein said preemphasis factor u is 0.7. ) 48.', 'A bidirectional wireless communication sub-system as defined in claim 44, wherein said perceptual weighting filter has a transfer function of the form: Wz) =A @Y)
47. A bidirectional wireless communication sub-system as defined in claim 46, wherein wu is set equal to v,.
48. A bidirectional wireless communication sub-system as defined in claim 43, wherein said perceptual weighting filter has a transfer function of the form: Wz) =A (zY,) I (1-y,2 7") where 0
49. A bidirectional wireless communication sub-system as defined in claim 48, wherein v, is set equal to wu.']
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SUMMARY
ClaimChart-ZA200103366B-STO
Patent number:ZA200103366B
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.