Voice recompression method and apparatus

• US 6,535,583 B1
• Filed: 08/26/1998
• Issued: 03/18/2003
• Est. Priority Date: 08/26/1998
• Status: Expired due to Fees

• Current Assignee: Avaya Incorporated
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Bobick, Aaron James, Buckler, Brian Lawrence
• Primary Examiner(s): Hoosain, Allan
• Application Number:
  US09/140,450
• Time in Patent Office: 1,665 Days
• Field of Search: 379/67.1, 379/68, 379/76, 379/83, 379/88.04, 379/88.07, 379/88.08, 379/88.1, 379/88.14, 379/88.18, 379/88.22, 379/88.25, 379/88.26, 379/88.27, 379/88.28, 379/100.02, 379/201, 379/88.17, 379/88.16, 370/271, 370/465, 370/477, 370/426, 370/468, 704/219, 704/260, 704/500, 455/413, 455/415, 455/558, 455/426, 455/468
• US Class Current: 379/88.1
• CPC Class Codes: G06F 3/16 Sound input; Sound output speech processing G10L
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: H04M 1/6505 storing speech in digital form

Abstract

A method and apparatus for storing a voice message. The method includes the steps of storing a coded representation of the voice message in a block of memory associated with the voice message and sized to correspond to the size of the coded representation, retrieving the coded representation to play the voice message to a user, compressing the coded representation to produce a compressed representation of the voice message, the compressed representation having a lesser size than the coded representation, after the coded representation has been retrieved, and storing the compressed representation of the message in the block of memory in place of the coded representation.

Claims

1. A method of storing a voice message, the method comprising the steps of:

a) storing a coded representation of said voice message in a block of memory associated with said voice message and sized to correspond to the size of said coded representation;

b) retrieving said coded representation to play said voice message to a user;

c) compressing said coded representation automatically in response to a passage of a predetermined time period after the retrieving is completed to produce a compressed representation of said voice message, said compressed representation have a lesser size than said coded representation, after said coded representation has been retrieved; and

d) storing said compressed representation of said message in said block of memory in place of said coded representation.

2. A method as claimed in claim 1 further including the step of resizing said block of memory to approximately the size of said compressed representation.

3. A method as claimed in claim 1 further including the step of associating a played attribute with said voice message, said played attribute indicating whether or not said coded representation has been retrieved.

4. A method as claimed in claim 3 further including the step of annunciating a representation of said played attribute to said user.

5. A method as claimed in claim 1 further including the step of associating a compressed attribute with said voice message, said compressed attribute indicating whether or not said message is represented by said compressed representation.

6. A method as claimed in claim 1 wherein the step of storing includes the step of associating a location attribute with said voice message, said location attribute identifying said block of memory at which said coded representation or said compressed representation is stored.

7. A method as claimed in claim 1 further including the step of associating with said voice message a time attribute identifying a time of storing said coded representation.

8. A method as claimed in claim 1 further including the step of storing a plurality of coded representations of respective voice messages in respective blocks of memory sized to correspond to respective said coded representations.

9. A method as claimed in claim 8 further including the step of resizing said respective blocks of memory associated with played voice messages, to approximately the sizes of respective compressed representations.

10. A method as claimed in claim 8 further including the step of storing said plurality of coded representations in respective blocks of memory in a predefined order.

11. A method as claimed in claim 10 further including the step of storing said plurality of coded representations in respective contiguous blocks of memory.

12. A method as claimed in claim 8 further including the step of associating with each of said respective voice messages, location attributes representing the beginning point and end point of each of said respective blocks of memory.

13. A method as claimed in claim 12 further including the step of adjusting at least one of said location attributes after compressing an associated coded representation, to define a block of memory of reduced size.

14. A method as claimed in claim 13 further including the step of adjusting said location attributes of blocks of memory subsequent to said block of memory of reduced size to maintain said blocks of memory contiguous.

15. A method as claimed in claim 14 further including the step of associating with each of said respective messages a time attribute representing a time at which said coded representation is stored, a compressed attribute representing whether or not said voice message is represented by a compressed representation and a played attribute representing whether or not said coded representation has been retrieved, said played attribute being set active when said coded representation is retrieved.

16. A method as claimed in claim 15 further including the step of compressing said coded representation when said played attribute is active and setting said compressed attribute active in response to compressing said coded representation.

17. A method as claimed in claim 16 further including the step of compressing when said end point of the block of memory having the greatest end point value has a value greater than a predefined end point value.

18. A method as claimed in claim 15 further including the step of setting said time attribute when said coded representation is stored.

19. A method as claimed in claim 17 further including the step of compressing when said time attribute is greater than a predefined time value, and setting said compressed attribute active in response to compressing said coded representation.

20. A method as claimed in claim 1 further including the step of receiving said voice message from a telephone line.

21. An apparatus for storing a voice message, the apparatus comprising:

a) memory operable to be divided into variable sized blocks;

b) first storing means for associating a block of memory with said voice message and for storing a coded representation of said voice message in said block of memory and for sizing said block of memory to correspond to the size of said coded representation;

c) retrieving means for retrieving said coded representation to play said voice message to a user;

d) compressing means for compressing said coded representation automatically in response to passage of a predetermined time period after said coded representation has been retrieved to produce a compressed representation of said voice message, said compressed representation having lesser size than said coded representation; and

e) second storing means for storing said compressed representation of said message in said block of memory in place of said coded representation.

22. An apparatus as claimed in claim 21 further including resizing means for resizing said block of memory to approximately the size of said compressed representation.

23. An apparatus as claimed in claim 21 further including associating means for associating a played attribute with said voice message, said played attribute indicating whether or not said coded representation has been retrieved.

24. An apparatus as claimed in claim 23 further including annunciating means for annunciating a representation of said played attribute to said user.

25. An apparatus as claimed in claim 21 wherein said associating means associates a compressed attribute with said voice message, said compressed attribute indicating whether or not said message is represented by said compressed representation.

26. An apparatus as claimed in claim 21 wherein said associating means associates a location attribute with said voice message, said location attribute identifying said block of memory at which said coded representation or said compressed representation is stored.

27. An apparatus as claimed in claim 21 wherein said associating means associates with said voice message a time attribute identifying a time of storing said coded representation.

28. An apparatus as claimed in claim 21 wherein said storage means stores a plurality of coded representations of respective voice messages in respective blocks of memory sized to correspond to respective said coded representations.

29. An apparatus as claimed in claim 28 further including resizing means for resizing said respective blocks of memory associated with played voice messages, to approximately the respective sizes of respective compressed representations.

30. An apparatus as claimed in claim 28 wherein said first storing means stores said plurality of coded representations in respective blocks of memory in a predefined order.

31. An apparatus as claimed in claim 30 wherein said second storing means stores said plurality of coded representations in respective contiguous blocks of memory.

32. An apparatus as claimed in claim 28 further including associating means for associating with each of said respective voice messages, location attributes representing beginning and end points of each of said respective blocks of memory.

33. An apparatus as claimed in claim 32 further including adjusting means for adjusting at least one of said location attributes after an associated coded representation has been compressed, to define a block of memory of reduced size.

34. An apparatus as claimed in claim 33 wherein said adjusting means adjusts said location attributes of blocks of memory subsequent to said block of memory of reduced size, to maintain said blocks of memory contiguous.

35. An apparatus as claimed in claim 34 further including associating means for associating with each of said respective messages a time attribute representing a time at which said coded representation is stored, a compressed attribute representing whether or not said voice message is represented by a compressed representation and a played attribute representing whether or not said coded representation has been retrieved.

36. An apparatus as claimed in claim 35 further including attribute setting means for setting said played attribute active when said coded representation is retrieved.

37. An apparatus as claimed in claim 36 wherein said compressing means is activated when said played attribute is active and wherein said attribute setting means sets said compressed attribute active in response to compressing said coded representation.

38. An apparatus as claimed in claim 37 wherein said compressing means is activated when said end point of the block of memory having the greatest end point value has a value greater than a predefined end point value.

39. An apparatus as claimed in claim 36 wherein said attribute setting means sets said time attribute when said coded representation is stored and increments said time attribute to reflect time elapsed since said coded representation was stored.

40. An apparatus as claimed in claim 39 wherein said compressing means is activated when said time attribute is greater than a predefined time value, and wherein said attribute setting means sets said compressed attribute in response to compressing said coded representation.

41. An apparatus as claimed in claim 21 further including means for receiving said voice message from a telephone line and for providing said voice message to said storage means.

42. An apparatus for storing a voice message, the apparatus comprising:

a) memory operable to be divided into various sized blocks; and

b) a processor for

i) associating a block of memory with said voice message and for storing a coded representation of said voice message in said block of memory and for sizing said block of memory to correspond to the size of said coded representation;

ii) retrieving said coded representation to play said voice message to a user;

iii) compressing said coded representation automatically in response to passage of a predetermined time period after said coded representation has been retrieved to produce a compressed representation of said voice message, having lesser size than said coded representation; and

iv) storing said compressed representation of said message in said block of memory in place of said coded representation.

43. An apparatus as claimed in claim 42 wherein said processor is programmed to resize said block of memory to approximately the size of said compressed representation.

44. An apparatus as claimed in claim 42 wherein said processor is programmed to associate a played attribute with said voice message, said played attribute indicating whether or not said coded representation has been retrieved.

45. An apparatus as claimed in claim 44 further including an annunciator for annunciating a representation of said played attribute to said user.

46. An apparatus as claimed in claim 42 wherein said processor is programmed associate a compressed attribute with said voice message, said compressed attribute indicating whether or not said message is represented by said compressed representation.

47. An apparatus as claimed in claim 42 wherein said processor is programmed to associate a location attribute with said voice message, said location attribute identifying said block of memory at which said coded representation or said compressed representation is stored.

48. An apparatus as claimed in claim 42 wherein said processor is programmed to associate with said voice message a time attribute identifying a time of storing said coded representation.

49. An apparatus as claimed in claim 42 wherein said processor is programmed to store a plurality of coded representations of respective voice messages in respective blocks of memory and to size said blocks of memory to correspond to respective said coded representations.

50. An apparatus as claimed in claim 49 wherein said processor is programmed to resize said respective blocks of memory associated with played voice messages, to approximately said respective sizes of respective compressed representations.

51. An apparatus as claimed in claim 49 wherein said processor is programmed to store said plurality of coded representations in respective blocks of memory in a predefined order.

52. An apparatus as claimed in claim 51 wherein said processor is programmed to store said plurality of coded representations representing said messages in respective contiguous blocks of memory.

53. An apparatus as claimed in claim 49 wherein said processor is programmed to store a location attribute associator for associating with each of said respective voice messages, location attributes representing said beginning point and end point of each of said respective blocks of memory.

54. An apparatus as claimed in claim 53 wherein said processor is programmed to adjust at least one of said location attributes after compressing an associated coded representation, to define a block of memory of reduced size.

55. An apparatus as claimed in claim 54 wherein said processor is programmed to adjust said location attributes of blocks of memory subsequent to said block of memory of reduced size to maintain said blocks of memory contiguous.

56. An apparatus as claimed in claim 55 wherein said processor is programmed to associate with each of said respective messages a time attribute representing a time at which said coded representation is stored, a compressed attribute representing whether or not said voice message is represented by a compressed representation and a played attribute representing whether or not said coded representation has been retrieved.

57. An apparatus as claimed in claim 56 wherein said processor is programmed to set said played attribute active when said coded representation is retrieved.

58. An apparatus as claimed in claim 57 wherein said processor is programmed to compress said coded representation when said played attribute is active and to set said compressed attribute active after compressing said coded representation.

59. An apparatus as claimed in claim 58 wherein said processor is programmed to compress said coded representation when said end point of the block of memory having the greatest end point value has a value greater than a predefined end point value.

60. An apparatus as claimed in claim 58 wherein said processor is programmed to set said time attribute when said coded representation is stored and to adjust said time attribute to reflect time elapsed since said coded response was stored.

61. An apparatus as claimed in claim 60 wherein said processor is programmed to compress said coded representation when said time attribute is greater than a predefined time value, and to set said compressed attribute active after compressing.

62. An apparatus as claimed in claim 42 further including a receiver for receiving said voice message from a telephone line and for providing said voice message to said processor.

63. A processor readable storage medium on which is stored a plurality of processor readable codes for directing a processor to store a voice message by:

a) storing a coded representation of said voice message in a block of memory associated with said voice message and sized to correspond to the size of said coded representation;

b) retrieving said coded representation to play said voice message to a user;

c) compressing said coded representation automatically in response to passage of a predetermined time period after the retrieving is completed to produce a compressed representation of said voice message, said compressed representation having a lesser size than said coded representation; and

d) storing said compressed representation of said message in said block of memory in place of said coded representation.

64. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of resizing said block of memory to approximately the size of said compressed representation.

65. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of associating a played attribute with said voice message, said played attribute indicating whether or not said coded representation has been retrieved.

66. A processor readable storage medium as claimed in claim 65 further including codes operable to direct said processor to perform the step of annunciating a representation of said played attribute to said user.

67. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of associating a compressed attribute with said voice message, said compressed attribute indicating whether or not said message is represented by said compressed representation.

68. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of associating a location attribute with said voice message, said location attribute identifying said block of memory at which said coded representation or said compressed representation is stored.

69. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of associating with said voice message a time attribute identifying a time of storing said coded representation.

70. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of storing a plurality of coded representations of respective voice messages in respective blocks of memory sized to correspond to respective said coded representations.

71. A processor readable storage medium as claimed in claim 70 further including codes operable to direct said processor to perform the step of associating with each of said respective voice messages, location attributes representing the beginning point and end point of each of said respective blocks of memory.

72. A processor readable storage medium as claimed in claim 71 further including codes operable to direct said processor to perform the step of adjusting at least one of said location attributes after compressing an associated coded representation, to define a block of memory of reduced size.

73. A processor readable storage medium as claimed in claim 72 further including codes operable to direct said processor to perform the step of adjusting said location attributes of blocks of memory subsequent to said block of memory of reduced size to maintain said blocks of memory contiguous.

74. A processor readable storage medium as claimed in claim 73 further including codes operable to direct said processor to perform the step of associating with each of said respective messages a time attribute representing a time at which said coded representation is stored, a compressed attribute representing whether or not said voice message is represented by a compressed representation and a played attribute representing whether or not said coded representation has been retrieved, said played attribute being set active when said coded representation is retrieved.

75. A processor readable storage medium as claimed in claim 74 further including codes operable to direct said processor to perform the step of compressing said coded representation when said played attribute is active and setting said compressed attribute active in response to compressing said coded representation.

76. A processor readable storage medium as claimed in claim 75 further including codes operable to direct said processor to perform the step of compressing when said end point of the block of memory having the greatest end point value has a value greater than a predefined end point value.

77. A processor readable storage medium as claimed in claim 74 further including codes operable to direct said processor to perform the step of setting said time attribute when said coded representation is stored.

78. A processor readable storage medium as claimed in claim 77 further including codes operable to direct said processor to perform the step of compressing when said time attribute is greater than a predefined time value, and setting said compressed attribute active in response to said compressing.

79. A processor readable storage medium as claimed in claim 70 further including codes operable to direct said processor to perform the step of resizing said respective blocks of memory associated with played voice messages, to approximately the sizes of corresponding compressed representations.

80. A processor readable storage medium as claimed in claim 70 further including codes operable to direct said processor to perform the step of storing said plurality of coded representations in respective blocks of memory in a predefined order.

81. A processor readable storage medium as claimed in claim 80 further including codes operable to direct said processor to perform the step of storing said plurality of coded representations representing said messages in respective contiguous blocks of memory.

82. A processor readable storage medium as claimed in claim 63 further including codes operable to direct said processor to perform the step of receiving said voice message from a telephone line.