Abstract
A pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this wideband sound signal. The new method and device which achieve efficient modeling of the harmonic structure of the speech spectrum uses several forms of low pass filters applied to a pitch codevector, the one yielding higher prediction gain (i.e. the lowest pitch prediction error) is selected and the associated pitch codebook parameters are forwarded.
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Specification Information
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Technologies
Signal Processing
Product
Base Station (eNB/gNB)User Equipment (UE/Terminal)
Use Cases
Network OptimizationWireless communication
Services
Error correction/detection
Claim
1. A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal in order to reduce a difference 5 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; 10 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 15 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. 20
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 1 WO 00/25304 PCT/CA99/01010 47 wherein /.t 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 /t is 0.7. 5
4. A perceptual weighting device as defined in claim 2, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1-y 2 z-) 10 where 0< Y2 < Y < 1 and Y2 and y, are weighting control values.
5. A perceptual weighting device as defined in claim 4, wherein Y2 is set equal to t. 15
6. A perceptual weighting device as defined in claim 1, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y) / (1-y 2 z- 1 ) 20 where 0< Y2 < Y, 1 and Y2 and y, are weighting control values.
7. A perceptual weighting device as defined in claim 6, wherein Y2 is set equal to u. WO 00/25304 PCT/CA99/01010 48
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 5 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, 10 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. 15
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: P(z) = 1 - pz 20 wherein pt 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 Pt is 0.7. WO 00/25304 PCT/CA99/01010 4911. 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: W(z) = A (z/y 1 ) / (1 -y 2 z -1) 5 where 0< Y2 < Y 1 and Y 2 and y, are weighting control values
12. A method for producing a perceptually weighted signal as defined in claim 11, wherein y, is set equal to pu. 1013. 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: 15 W(z) = A (z/y 1 ) / (1-y 2 z-1 where 0< Y2 < y, 1 and Y2 and y, are weighting control values
14. A method for producing a perceptually weighted signal as defined in 20 claim 13, wherein Y2 is set equal to 4
15. An encoder for encoding a wideband signal, comprising: a) a perceptual weighting device as recited in claim 1; WO 00/25304 PCT/CA99/01010 50 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 5 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. 1016. An encoder as defined in claim 15, wherein said signal preemphasis filter has a transfer function of the form: P(z) = 1 - pz 1 15 wherein /.z is a preemphasis factor having a value located between 0 and1
17. An encoder as defined in claim 16, wherein said preemphasis factor p is 0.7. 2018. An encoder as defined in claim 16, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1-y 2 z -1) WO 00/25304 PCT/CA99/01010 51 where 0< Y2 < Y, 1 and Y2 and y, are weighting control values
19. An encoder as defined in claim 18, wherein Y2 is set equal to I.
20. An encoder as defined in claim 15, wherein said perceptual weighting 5 filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1-y 2 z -1) where 0< Y2 < Y, 1 and Y2 and y, are weighting control values. 10
21. An encoder as defined in claim 20, wherein /. is set equal to Y2*
22. A cellular communication system for servicing a large geographical area divided into a plurality of cells, comprising: 15 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 20 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: WO 00/25304 PCT/CA99/01010 52 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 5 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: 10 P(z) = 1 - pz 1 wherein 4 is a preemphasis factor having a value located between 0 and1.
24. A cellular communication system as defined in claim 23, wherein said 15 preemphasis factor / 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: 20 W(z) = A (z/y 1 ) / (1-y 2 z -1) where 0< Y2 < Y 1 and y, and y, are weighting control values. WO 00/25304 PCT/CA99/01010 53
26. A cellular communication system as defined in claim 25, wherein 4 is set equal to Y2*
27. A cellular communication system as defined in claim 22, wherein said perceptual weighting filter has a transfer function of the form: 5 W(z) = A (z/y) / (1 -y 2 z-) where 0< Y2 < Y, < 1 and Y2 and y, are weighting control values. 10
28. A cellular communication system as defined in claim 27, wherein Y2 is set equal top.
29. A cellular mobile transmitter/receiver unit comprising: a) a transmitter including an encoder for encoding a wideband 15 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. 20
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-1 WO 00/25304 PCT/CA99/00100 54 wherein , 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 / is 0.7. 5
32. A cellular mobile transmitter/receiver unit as defined in claim 30, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1 -y 2 z -1) 10 where 0< Y2 < y, < 1 and Y2 and y, are weighting control values.
33. A cellular mobile transmitter/receiver unit as defined in claim 32, wherein Y2 is set equal to pt. 15
34. A cellular mobile transmitter/receiver unit as defined in claim 29, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1 -Y2Z -1) 20 where 0< Y2 < Y 1 and Y2 and y, are weighting control values.
35. A cellular mobile transmitter/receiver unit as defined in claim 34, wherein Y2 is set equal to /. WO 00/25304 PCT/CA99/01010 55
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 5 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: 10 P(z) = 1 - pz wherein / is a preemphasis factor having a value located between 0 and1. 15
38. A cellular network element as defined in claim 37, wherein said preemphasis factor 4 is 0.7.
39. A cellular network element as defined in claim 37, wherein said perceptual weighting filter has a transfer function of the form: 20 W(z) = A (z/y 1 ) / (1 -y 2 z-1 where 0< Y 2 < y, 1 and y 2 and y, are weighting control values. WO 00/25304 PCT/CA99/01010 56
40. A cellular network element as defined in claim 39, wherein Y2 is set equal to p.', "41. A cellular network element as defined in claim 36, wherein said perceptual weighting filter has a transfer function of the form: 5 W(z) = A (z/y 1 ) / (1-y 2 z ') where 0< y 2 < Y, 1 and Y2 and y, are weighting control values. 10", '42. A cellular network element as defined in claim 41, wherein . is set equal to Y2*
43. In a cellular communication system for servicing a large geographical area divided into a plurality of cells, comprising: mobile transmitter/receiver 15 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 20 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 signal; and WO 00/25304 PCT/CA99/01010 57 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 5 43, wherein said signal preemphasis filter has a transfer function of the form: P(z) = 1 - pz wherein /- is a preemphasis factor having a value located between 0 and1. 10
45. A bidirectional wireless communication sub-system as defined in claim 44, wherein said preemphasis factor 1 is 0.7.
46. A bidirectional wireless communication sub-system as defined in claim 15 44, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1 -y 2 Z - 1) 20 where 0< Y2 < Y, 1 and Y2 and y, are weighting control values.
47. A bidirectional wireless communication sub-system as defined in claim 46, wherein / is set equal to y 2 . WO 00/25304 PCT/CA99/01010 58
48. A bidirectional wireless communication sub-system as defined in claim 43, wherein said perceptual weighting filter has a transfer function of the form: W(z) = A (z/y 1 ) / (1-y 2 z - ) 5 where 0< Y2
49. A bidirectional wireless communication sub-system as defined in claim 48, wherein Y2 is set equal to /.']
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SUMMARY
ClaimChart-AU6457199A-STO
Patent number:AU6457199A
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
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Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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