Universal paging device with power conservation

• US 4,518,961 A
• Filed: 01/30/1984
• Issued: 05/21/1985
• Est. Priority Date: 10/01/1980
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Raghunathan, Kuppuswamy, Davis, Walter L.
• Primary Examiner(s): Thomas, James D.
• Assistant Examiner(s): Eng, David Y.
• Application Number:
  US06/575,472
• Time in Patent Office: 477 Days
• Field of Search: 364/200 MS File, 364/900 MS File, 364/728, 455/34, 455/38, 455/228, 455/343, 375/58, 340/311.1, 340/825.44, 340/146.2
• US Class Current: 340/7.35
• CPC Class Codes: G08B 3/1066 with other provisions not elsewhere provided for, e.g. turn-off protection
• CPC Class Codes: H04L 7/0337 Selecting between two or more discretely delayed clocks or selecting between two or more discretely delayed received code signals
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15
• CPC Class Codes: H04W 52/0232 according to average transmission signal activity
• CPC Class Codes: H04W 8/245 from a network towards a terminal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: H04W 88/026 using digital address codes
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A battery powered, adaptive signal decoder is disclosed which is capable of processing detected encoded signals in accordance with a plurality of decoding schemes. The decoder has an equivalent microcomputer implementation. Energy conservation means operating independently of the detected signals acts to conserve the energy of the battery.

Claims

1. A communication system message receiving device for decoding signals transmitted in accordance with one of a plurality of multi-bit different word length information encoding formats comprising:

a communication receiver for detecting encoded signals transmitted over a communication channel;

a power source;

a data sampler, coupled to said power source and to said receiver to process said detected encoded signals in real time and to process said detected signals in accordance with any one of a plurality of information decoding formats corresponding to said plurality of information encoding formats;

coding format selection means, coupled to said receiver and said data sampler, including identification means responsive to predetermined characteristics of said detected encoded signals for identifying the format of the transmitted message, said selection means automatically selecting, in response to said identification means, which of said plurality of information decoding formats will be utilized for processing said detected encoded signals;

a code memory coupled to said selection means containing predetermined sequences of decoded signals corresponding to each of said plurality of information encoding formats;

comparison means, coupled to said data sampler and said code memory, for determining if said decoded signals correlate to said predetermined sequence of decoded signals for the selected information decoding format, said comparison means producing a control signal if said signals correlate and;

annunciation means coupled to said comparison means and responsive to said control signal for signalling the user of the reception of a message.

2. The message receiving device of claim 1 further including disabling means coupled to and restricting the operation of said selection means by selecting at least one of said plurality of information decoding formats, thereby limiting the capacity of said data sampler to process said detected encoded signals to less than said plurality of information decoding formats.

3. The message receiving device of claim 2 wherein said disabling means is coupled to and responsive to said code memory.

4. The message receiving device of claim 3 wherein said code memory further includes information for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

5. The message receiving device of claim 4 wherein said device includes an internal clock establishing time signals, and means responsive to said time signals for controlling operational functions for said message receiving device independently of the detection of encoded signals.

6. The message receiving device of claim 5 further including conservation means responsive to said time signals for reducing the power drain on said power source by temporarily disabling preselected functions of said message receiving device.

7. The message receiving device of claim 1 wherein said code memory further includes information for designating the operational characteristics and features of the message signaling device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

8. The message receiving device of claim 7 wherein said device includes an internal clock establishing time signals, and means responsive to said time signals for controlling operational functions for said message receiving device independently of the detection of encoded signals.

9. The message receiving device of claim 8 further including priority means coupled to said data sampler, preventing the change of information decoding formats until completion of the decoding operation for a currently selected format.

10. The message receiving device of claim 9 wherein said annunciation means is coupled to said coding format selection means and responsive to the selected information decoding format, for designating and actuating annunciation of a distinct signaling pattern upon reception of a message.

11. The message signaling device of claim 8 further including an externally accessible selector coupled to said coding format selection means for the enabling of any subset of said plurality of information decoding formats.

12. The message receiving device of claim 11 further including priority means coupled to said data sampler, preventing the change of information decoding format until completion of the decoding operation for a currently selected format.

13. The message receiving device of claim 11 wherein said annunciation means is coupled to said coding format selection means and responsive to the selected information decoding format for designating and actuating annunciation of a distinct signaling pattern upon reception of a message.

14. The message receiving device of claims 1 or 12 wherein said coding format selection means further includes means for establishing the tuning frequency of said receiver at the carrier frequency of one or more communication channels, whereby the predetermined characteristics comprise the carrier frequency for said transmitted signals.

15. The message receiving device of claims 1 or 12 wherein said coding format selection means further includes means for detecting the bit rate of a multi-bit word length information encoding format, whereby the predetermined characteristics comprise the bit rate of transmitted signals.

16. A communication system message receiving device for decoding messages transmitted in accordance with one of a plurality of multi-bit different word length information encoding formats comprising:

a communication receiver for detecting encoded signals transmitted over a communication channel;

a power source;

a microcomputer, including a microprocessor interconnected with a read-only memory, coupled to said power source and responsive to detected encoded signals from said receiver to process said detected encoded signals in real time and to process said detected signals in accordance with any one of a plurality of information decoding formats corresponding to said plurality of information encoding formats;

coding format selection means, coupled to said receiver and said microcomputer, including identification means responsive to predetermined characteristics of said detected encoded signals for identifying the format of the transmitted message, said selection means automatically selecting which of said plurality of said information decoding formats will be utilized for processing said detected encoded signals;

a code memory, coupled to and accessed by said microcomputer containing predetermined sequences of decoded signals corresponding to each of said plurality of information encoding formats,;

wherein said microcomputer includes means to determine if said decoded signal correlate to said predetermined sequence of decoded signals for the selected information decoding format and produce a control signal upon correlation; and

annunciation means coupled to said microcomputer and responsive to said control signal for signaling the user of the reception of a message.

17. The message receiving device of claim 16 further including disabling means coupled to and restricting the operation of said selection means by selecting at least one of said plurality of information decoding formats thereby limiting the capacity of said microcomputer to process said detected encoded signals to less than said plurality of decoding formats.

18. The message receiving device of claim 17 wherein said disabling means for is coupled to and responsive to said code memory.

19. The message receiving device of claim 18 wherein said code memory further includes information for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

20. The message receiving device of claim 19 wherein said microprocessor further includes an internal clock establishing time signals, and said message receiving device further includes means responsive to said time signals for controlling operational functions for said message receiving device independently of the detection of encoded signals.

21. The message receiving device of claim 20 further including conservation means responsive to said time signals for reducing the power drain on said power source by temporarily disabling preselected functions of said message receiving device.

22. The message receiving device of claim 16 wherein said code memory further includes information for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

23. The message receiving device of claim 22 wherein said microcomputer device further includes an internal clock establishing time signals, and said message receiving device further includes means responsive to said time signals for controlling operational functions for said message signaling device independently of the detection of encoded signals.

24. The message receiving device of claim 23 further including priority means coupled to said microcomputer, preventing the change of information decoding formats until completion of the decoding operation for a currently selected format.

25. The message receiving device of claim 24 wherein said annunciator means is coupled to said coding format selection means and responsive to the selected information decoding format, for designating and actuating annunciation of a distinct signal pattern upon reception of a message.

26. The message receiving device of claim 25 wherein said code memory is completely contained in and part of said read-only memory.

27. The message receiving device of claim 23 further including an externally accessible selector coupled to said coding format selection means for the enabling of any subset of said plurality of information decoding formats.

28. The message receiving device of claim 27 further including priority means coupled to said microcomputer, preventing the change of information decoding format until completion of the decoding operation for a currently selected format.

29. The message receiving device of claim 28 wherein said annunciator means is coupled to said coding format selection means and responsive to the selected information decoding format, for designating and actuating annunciation of a distinct signaling pattern upon reception of a message.

30. The message receiving device of claim 29 wherein said code memory is completely contained in and part of said read-only memory.

32. The message signaling device of claim 27 wherein said message receiving device further includes feature actuating means, responsive to said designating information in said code memory, for actuating said operational characteristics and features of the device.

33. The message receiving device of claim 32 wherein said decoder includes means responsive to said internal clock for controlling said operational characteristics and functions for said device independently of the detection of encoded signals.

34. The message receiving device of claim 33 wherein said decoder is implemented in CMOS.

35. The message receiving device of claim 32 further including multi-pin socket means for coupling said code memory to said decoder thereby enabling easy removal and changing of said code memory.

36. The message receiving device of claim 35 wherein said decoder includes means responsive to said internal clock for controlling operational functions for said decoder independently of the detection of encoded signals.

37. The message receiving device of claim 36 wherein said decoder is implemented in CMOS.

38. The message receiving device of claim 32 wherein said conservation means further includes means for operating said decoder with an operational duty cycle to restrict power drain from said battery.

39. The message receiving device of claim 38 further including multi-pin socket means for coupling said code memory to said decoder thereby enabling easy removal and changing of said code memory.

40. The message receiving device of claim 39 wherein said decoder includes means responsive to said internal clock for controlling operational characteristics and functions for said device independently of the detection of encoded signals.

41. The message receiving device of claim 40 wherein said decoder is implemented in CMOS.

31. A communication system message receiving device for portable applications comprising:

a communication receivor for detecting encoded signals transmitted over a communication channel;

a battery;

a decoder, coupled to said battery and responsive to detected encoded signals from said receiver to process said detected signals in real time, said decoder including an internal clock establishing timing signals;

conservation means responsive to the timing signals of said decoder for reducing the power drain on said battery by temporarily disabling preselected functions of said message receiving device;

a code memory coupled to and accessed by said decoder containing predetermined sequence information and designating information;

said designating information in said code memory being unrelated to said predetermined sequence information, for designating the operational characteristics and features of the message receiving device;

comparison means coupled to said decoder and said code memory for determining if said detected signals correlate with said predetermined sequence information, said comparison means producing a control signal if said signals correlate with said information; and

annunciation means coupled to said comparison means and responsive to said control signal for signaling the user of the reception of a message.

42. A communication system message receiving device for portable applications comprising;

a communication receiver for detecting encoded signals transmitted over a communication channel;

a battery;

a microcomputer, including a microprocessor interconnected with a read-only memory, coupled to said battery and responsive to detected encoded signals from said receiver, to process said detected signals in real time, said microcomputer including an internal clock establishing timing signals;

conservation means responsive to the timing signals of said microcomputer for reducing the power predetermined drain on said battery by temporarily disabling preselected functions of said message receiving device;

a code memory coupled to and accessed by said microcomputer containing predetermined sequence information;

said microcomputer including comparison means for determining if said detected encoded signals correlate with said predetermined sequence information, said comparison means producing a control signal if said signals correlate with said information; and

annunciation means coupled to said microcomputer and responsive to said control signal for signaling the user of the reception of a message.

43. The message receiving device of claim 42 wherein said code memory includes designating information, unrelated to said predetermined sequence information, for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

44. The message receiving device of claim 43 further including multi-pin socket means for coupling said code memory to said microcomputer thereby enabling easy removal and changing of said code memory.

45. The message receiving device of claim 44 wherein said conservation means further includes means for disabling preselected functions for said message receiving device independently of the detection of encoded signals.

46. The message receiving device of claim 45 wherein said microcomputer includes means for processing eight-bit word length information.

47. The message receiving device of claim 46 wherein said microcomputer is implemented in CMOS.

48. The message receiving device of claim 43 wherein said code memory is completely contained in and part of said read-only memory.

49. The message receiving device of claim 48 wherein said conservation means further includes means for disabling preselected functions for said message receiving device independently of the detection of encoded signals.

50. The message receiving device of claim 49 wherein said microcomputer includes means for processing eight-bit word length information.

51. The message receiving device of claim 50 wherein said microcomputer is implemented in CMOS.

52. The message receiving device of claim 42 wherein said conservation means further includes means for operating said microcomputer with an operational duty cycle to restrict power drain from said battery.

53. The message receiving device of claim 49 wherein said code memory includes designating information, unrelated to said predetermined identification information, for designating the operational characteristics and features of the message signaling device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

54. The message receiving device of claim 53 further including multi-pin socket means for coupling said code memory to said microcomputer thereby enabling easy removal and changing of said code memory.

55. The message receiving device of claim 51 wherein said conservation means further includes means for disabling preselected functions for said message receiving device independently of the detection of encoded signals.

56. The message receiving device of claim 55 wherein said microcomputer includes means for processing eight-bit word length information.

57. The message receiving device of claim 56 wherein said microcomputer is implemented in CMOS.

58. The message receiving device of claim 53 wherein said code memory is completely contained in and part of said read-only memory.

59. The message receiving device of claim 58 wherein said conservation means further includes means for disabling preselected functions for said message receiving device independently of the detection of encoded signals.

60. The message receiving device of claim 59 wherein said microcomputer includes means for processing eight-bit word length information.

61. The message receiving device of claim 60 wherein said microcomputer is implemented in CMOS.

63. The message receiving device of claim 59 wherein said decoder further includes an internal clock establishing time signals, means responsive to said time signals for multiple time sampling said encoded signals and means for storing samples for said real time signal processing of the digital information contained therein.

64. The message receiving device of claim 63 further including means for modifying the frequency of said time signals from said internal clock to establish said first and second modes of operation of said decoder.

65. The message receiving device of claim 64 wherein said decoder further includes means responsive to said time signals for controlling operational functions for said decoder independently of the detection of encoded signals.

66. The message receiving device of claim 65 further including means for synchronizing said internal clock signals with an external communication system clock.

67. The message receiving device of claim 66 further including means responsive to said decoder for reducing the power drain on said battery by temporarily disabling preselected functions of said message receiving device.

68. The message receiving device of claim 67 wherein said decoder includes means for controlling the electrical power between said battery and said receiver.

69. The message receiving device of claim 68 wherein said annunciator comprises a sonic frequency annunciator to provide the signaling when a message for said receiving device has been received.

70. The message receiving device of claim 69 further including a replaceable code memory means containing said code memory.

62. A communication system message receiving device for portable applications comprising:

a communication receiver for detecting encoded signals transmitted over a communication channel;

a limited capacity battery;

a decoder coupled to said battery, responsive to detected encoded signals from said receiver and processing said signals in real time;

said decoder having two modes of operation, a first mode associated with full processing capability in real time with a corresponding power drain from said battery and, a second mode of operation associated with a diminished processing capability with a correspondingly diminished power drain from said battery;

a DC to DC power converter coupled between said battery and said decoder to establish a power level supporting said first mode of operation of said decoder;

a code memory coupled to said decoder containing a predetermined sequence of signals;

a comparator coupled to said decoder and said code memory determining if said detected encoded signals correlate with said predetermined sequence of signals, said comparator producing a control signal if said signals correlate; and

an annunciator coupled to said comparator and responsive to said control signal for signaling the user of the reception of a message.

71. A communication system message receiving device for portable applications comprising:

a communication receivier for detecting encoded signals transmitted over a communication channel;

a limited capacity battery;

a microcomputer coupled to said battery, including a microprocessor interconnected with a read-only memory, responsive to detected encoded signals from said receiver and processing said signals in real time;

said microcomputer having two modes of operation, a first mode associated with full computational capability in real time with a corresponding power drain from said battery and, a second mode of operation associated with a diminished computational capability with a correspondingly diminished power drain from said battery;

a DC to DC power converter coupled between said battery and said microcomputer to establish a power level supporting said first mode of operation of said microcomputer;

a code memory coupled to said microcomputer containing a predetermined sequence of signals;

said microcomputer including comparison means for determining if said detected and processed signals correlate with said predetermined sequence of signals, said comparison means producing a control signal if said signals correlate; and

an annunciator coupled to said microcomputer and responsive to said control signal means for signaling the user of the reception of a message.

72. The message receiving device of claim 71 wherein said microcomputer further includes an internal clock establishing time signals, means responsive to said time signals for multiple time sampling said encoded signals and means for storing samples for said real time signal processing of the digital information contained therein.

73. The message receiving device of claim 72 further including means for modifying the frequency of said time signals from said internal clock to establish said first and second modes of operation of said microcomputer.

74. The message receiving device of claim 73 wherein said microcomputer includes means responsive to said internal clock for controlling operational functions for said message receiving device independently of the detection of encoded signals.

75. The message receiving device of claim 74 further including means for synchronizing said internal clock signals with an external communication system clock.

76. The message receiving device of claim 75 further including means responsive to said microcomputer for reducing the power drain on said battery by temporarily disabling preselected functions of said message signaling device.

77. The message receiving device of claim 76 wherein said microcomputer includes means for controlling the electrical power between said battery and said receiver.

78. The message receiving device of claim 77 wherein said annunciator comprises a sonic frequency annunciator providing the signaling when a message has been received.

79. The message receiving device of claim 78 wherein said code memory is completely contained in and part of said read-only memory.

80. The message receiving device of claim 79 further including a replaceable code memory means containing said code memory.

81. In a communication receiver having a signal detector for decoding signals transmitted in accordance with a multi-bit different word length information encoding format, a received data sampling and analysis device comprising:

a plurality of selectively enableable serial shift registers coupled to said detector in a parallel arrangement;

clock generating means generating repetitive timing signals at a predetermined rate, the interval between said timing signals being less than an anticipated bit interval;

multiplex control means responsive to said clock generating means and coupled to said serial shift registers to sequentially enable said serial shift registers to be responsive to said signal detector to transfer information from said detector to said enabled serial shift register;

bit pattern reference means;

correlator means, responsive to said multiplex control means, having input terminals coupled to the outputs of said serial shift registers and to said bit pattern reference means, said correlator means generating a distinctive output signal when there is substantial identity between the contents of the shift registers and the bit pattern reference means;

whereby the contents of each of said serial registers comprise detected information bit sequences which may be correlated with said bit pattern reference means in a parallel bit by bit comparison and multiple sampling and analysis of the received data may be achieved during an anticipated bit time interval.

82. The data sampling and analysis device of claim 81, wherein said clock gennerating means further includes means for generating repetitive timing signals at a rate such that the internal between said timing signals is 1/n times the anticipated, bit interval, where n=the number of selectively enableable serial shift registers in said plurality.

83. The data sampling and analysis device of claim 82, wherein said bit pattern reference means includes at least one bit pattern, and wherein each of said selectively enableable serial shift registers further includes means capable of serially shifting the same number of bits as are contained in said bit patterns of said bit pattern reference means.

84. The data sampling and analysis device of claim 83 wherein said plurality of selectively enableable serial shift registers comprises four registers and the interval between said timing signals is 1/4 of the anticipated bit interval.

85. The data sampling and analysis device of claim 84 wherein said correlator means further includes an addressable memory means containing predetermined correlation information at each such addressable location, said memory means being addressed by the results of a parallel bit-by-bit comparison of the information bit sequence occurring in each of said serial shift registers.

86. The data sampling and analysis device of claim 85 wherein said predetermined correlation information comprises error table information and said correlator means further includes an error counting means responsive to said clock means and said addressable memory means to sum the magnitude of errors over four samples to determine whether said distinctive output signal indicative of substantial identity should be produced.

87. A communication system message receiving device for decoding signals transmitted in accordance with one of a plurality of multi-bit different word length information encoding formats comprising:

a communication receiver for detecting encoded signals transmitted over a communication channel;

a power source;

a microcomputer, including a microprocessor interconnected with a read-only memory, coupled to said power source and responsive to detected encoded signals from said receiver to process said detected encoded signals in real time and to process said detected signals in accordance with any one of a plurality of information decoding formats corresponding to said plurality of information encoding formats;

said microcomputer further comprising coding format selection means, including identification means responsive to predetermined characteristics of said detected encoded signals, for identifying the format of the transmitted message, said selection means automatically selecting which of said plurality of information decoding formats will be utilized for processing said detected encoded signals;

a code memory, coupled to and accessed by said microcomputer containing predetermined sequences of decoded signals corresponding to each of said plurality of information encoding formats;

wherein said microcomputer includes means to determine if said decoded signals correlate to said predetermined sequence of decoded signals for the selected information decoding format and produce a control signal upon correlation; and

annunciation means coupled to said microcomputer and responsive to said control signal for signaling the user of the reception of a message.

88. The message receiving device of claim 87 further including disabling means coupled to and restricting the operation of said selection means by selecting at least one of said plurality of information decoding formats thereby limiting the capacity of said microcomputer to process said detected encoded signals to less than said plurality of decoding schemes.

89. The message receiving device of claim 88 wherein said disabling means is coupled to and responsive to said code memory.

90. The message receiving device of claim 89 wherein said code memory further includes information for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

91. The message receiving device of claim 90 wherein said microcomputer further includes an internal clock establishing time signals, and said message receiving device further includes means responsive to said time signals for controlling operational functions for said message receiving device independently of the detection of encoded signals.

92. The message receiving device of claim 91 further including conservation means responsive to said time signals for reducing the power drain on said power source by temporarily disabling preselected functions of said message receiving device.

93. The message receiving device of claim 87 wherein said code memory further includes information for designating the operational characteristics and features of the message receiving device, and said message receiving device further includes feature actuating means responsive to said designating information in said code memory for actuating said operational characteristics and features.

94. The message receiving device of claim 93 wherein said microcomputer further includes an internal clock establishing time signals, and said message receiving device further includes means responsive to said time signals for controlling operational functions for said message receiving device independently of the detection of encoded signals.

95. The message receiving device of claim 94 further including priority means coupled to said microcomputer, preventing the change of information decoding formats until completion of the decoding operation for a currently selected format.

96. The message receiving device of claim 95 wherein said annunciator means is coupled to said microcomputer and responsive to the selected information decoding format, for designating and actuating annunciation of a distinct signal pattern upon reception of a message.

97. The message receiving device of claim 96 wherein said code memory is completely contained in and part of said read-only memory.

98. The message receiving device of claim 94 further including an externally accessible selector coupled to said coding format selection means for the enabling of any subset of said plurality of information decoding formats.

99. The message receiving device of claim 98 further including priority means coupled to said microcomputer, preventing the change of information decoding format until completion of the decoding operation for a currently selected format.

100. The message receiving device of claim 99 wherein said annunciator means is coupled to said microcomputer and responsive to the selected information encoding format, for designating and actuating annunciation of a distinct signaling pattern upon reception of a message.

101. The message receiving device of claim 100 wherein said code memory is completely contained in and part of said read-only memory.

102. The message receiving device of claim 87 wherein said coding format selection means further includes means for establishing the tuning frequency of said receiver at the carrier frequency of one or more communication channels, whereby the predetermined characteristics comprise the carrier frequency for said transmitted signals.

103. The message receiving device of claim 87 wherein said coding format selection means further includes means for detecting the bit rate of a multi-bit word length information encoding format, whereby the predetermined characteristics comprise the bit rate of transmitted signals.