Paging receiver having a serial code plug

• US 4,417,246 A
• Filed: 11/05/1980
• Issued: 11/22/1983
• Est. Priority Date: 11/19/1979
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: General Electric Company
• Inventors: Agnor, William C., Elder, James H.
• Primary Examiner(s): Groody, James J.
• Application Number:
  US06/204,277
• Time in Patent Office: 1,112 Days
• Field of Search: 340/825.44, 340/825.45, 340/825.48, 340/311.1, 455/31, 455/35, 455/36, 455/37, 455/227, 455/453, 179/2 EB, 179/2 EC
• US Class Current: 340/7.38
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A paging receiver selectively operable in either a six tone battery saving mode or in a five tone non-battery saving mode. The receiver features a serial code plug for programming a programmable tone detector to be responsive to a specific paging receiver address comprising a predetermined combination of preamble and paging signals. The use of a serial code plug in place of the parallel code plug previously known and utilized in the industry allows a reduced complexity of the paging receiver and a corresponding size, weight and cost savings.

Claims

1. An improved paging radio receiver for producing a page output responsive to a predetermined preamble signal followed by a predetermined sequence of N paging signals, where N is any integer greater than one, said receiver comprising:

a. means for receiving a radio signal modulated by said preamble signal and paging signals;

b. means for demodulating the preamble and N paging signals from the radio signal;

c. programmable signal detection means connected to said demodulating means for detecting demodulated preamble and paging signals;

d. control means, connected to said signal detection means, for first programming said signal detection means for detecting said predetermined sequence of N paging signals, second programming said signal detection means for detecting said predetermined preamble signal, and third, in response to said predetermined preamble signal being detected by said signal detection means, programming said signal detection means for detecting said predetermined sequence of N paging signals; and

e. means, connected to said control means, for producing said page output in response to said predetermined sequence of N paging signals being detected by said signal detection means as programmed by said control means.

2. The improved paging radio receiver of claim 1 wherein said third programming of said signal detection means for detecting said sequence of N paging signals programs for detecting each successive signal of said sequence in response to the previous signal of said sequence being detected by said signal detection means.

3. The improved paging radio receiver of claim 1 or claim 2 wherein said control means comprises a detachable device that can be programmed to determine each signal of said predetermined sequence of N paging signals and said predetermined preamble signal to which said paging radio receiver will be responsive.

4. The improved paging radio receiver of claim 1 or claim 2 wherein said first programming of said signal detection means for detecting said sequence of N paging signals causes said signal detection means to be responsive in a sequential manner to the signals of said sequence and this sequential cycling of said first programming occurs at a sufficiently rapid rate to prevent detection of said N paging signals, and wherein said second and third programming of said signal detection means causes said signal detection means to be responsive in a sequential manner to said preamble signal and paging signals, and this sequential cycling of the second and third programming occurs at a relatively slower rate than caused by said first programming, and sufficiently slow to permit said signal detection means to detect said signals.

5. The improved paging radio receiver of claim 3 wherein said first programming of said signal detection means for detecting said sequence of N paging signals causes said signal detection means to be responsive in a sequential manner to the signals of said sequence and this sequential cycling of said first programming occurs at a sufficiently rapid rate to prevent detection of said N paging signals, and wherein said second and third programming of said signal detection means causes said signal detection means to be responsive in a sequential manner to said preamble signal and paging signals, and this sequential cycling of the second and third programming occurs at a relatively slower rate than caused by said first programming, and sufficiently slow to permit said signal detection means to detect said signals.

6. The improved paging radio receiver of claim 1 or 2 further comprising battery saving means for periodically activating said paging radio receiver at intervals less than the time duration of said predetermined preamble signal.

7. The improved paging radio receiver of claim 3 further comprising battery saving means for periodically activating said paging radio receiver at intervals less than the time duration of said predetermined preamble signal.

8. The improved paging radio receiver of claim 4 further comprising battery saving means for periodically activating said paging radio receiver at intervals less than the time duration of said predetermined preamble signal.

9. The improved paging radio receiver of claim 5 further comprising battery saving means for periodically activating said paging radio receiver at intervals less than the time duration of said preamble signal.

21. An improved paging receiver according to claim 1 wherein said preamble signal is a tone signal.

22. An improved paging receiver according to claim 1 wherein said paging signals are tone signals.

23. An improved paging receiver according to claim 1 wherein said preamble paging signals are tone signals.

24. An improved paging receiver according to claim 2 wherein said preamble signal is a tone signal.

25. An improved paging receiver according to claim 2 wherein said paging signals are tone signals.

26. An improved paging receiver according to claim 2 wherein said preamble and paging signals are tone signals.

27. An improved paging receiver according to claim 3 wherein said preamble signal is a tone signal.

28. An improved paging receiver according to claim 3 wherein said paging signals are tone signals.

29. An improved paging receiver according to claim 3 wherein said preamble and paging signals are tone signals.

30. An improved paging receiver according to claim 4 wherein said preamble signal is a tone signal.

31. An improved paging receiver according to claim 4 wherein said paging signals are tone signals.

32. An improved paging receiver according to claim 4 wherein said preamble and paging signals are tone signals.

33. An improved paging receiver according to claim 5 wherein said preamble signal is a tone signal.

34. An improved paging receiver according to claim 5 wherein said paging signals are tone signals.

35. An improved paging receiver according to claim 5 wherein said preamble and paging signals are tone signals.

36. An improved paging receiver according to claim 8 wherein said preamble signal is a tone signal.

37. An improved paging receiver according to claim 8 wherein said paging signals are tone signals.

38. An improved paging receiver according to claim 8 wherein said preamble and paging signals are tone signals.

57. The improved paging radio receiver of claim 1 or claim 2 wherein said first programming further comprises means for preventing detection of said N paging signals, and wherein said second and third programming of said signal detection means causes said signal detection means to be sequentially responsive to said preamble signal and paging signals, permitting said signal detection means to detect said signals.

10. An improved radio paging receiver for producing a page in response to a preamble signal of a first time duration followed by a sequence of N paging signals, each of said N paging signals having a second time duration shorter than said first time duration, where N is an integer of at least two, said paging receiver comprising:

a. means for activating said paging receiver;

b. means for receiving a radio signal modulated by said preamble and paging signals;

c. means for demodulating the preamble and paging signals

d. programmable signal detection means connected to said demodulating means for detecting demodulated preamble and paging signals;

e. means, connected to said programmable signal detection means, for programming said signal detection means to be responsive in a predetermined manner and comprising;

1. means, responsive to said paging receiver being activated, for causing said signal detection means to be responsive in a sequential manner to each of said N paging signals for an interval of time sufficiently shorter than said second time duration of each of said paging signals to prevent detection of said N paging signals;

2. means, responsive to completion of said sequence caused by said means of clause e1, for causing said signal detection means to be responsive to said preamble signal during two different time periods, each such time period being sufficiently long to permit detection of said preamble signal;

3. means, responsive to the detection of said preamble signal during said two different time periods for causing said signal detection means to be responsive to the first signal of said sequence of N paging signals for a time interval sufficiently long to permit detection of said first signal of said sequence of N paging signals;

4. means, responsive to the detection of a previous signal of said sequence of N paging signals during its respective time interval, for causing said signal detection means to be responsive to each successive signal of said sequence of N paging signals for a time interval sufficiently long to permit detection of each of said signals of said sequence of N paging signals; and

f. output means connected to said signal detection means and to said programming means for producing a page in response to the presence of the last successive signal in said sequence of N paging signal during its respective time interval.

11. The improved paging receiver of claim 10 further comprising means for deactivating said paging radio receiver in response to a failure by said programmable signal detection means to detect said preamble signal at the end of said two time periods.

12. The improved paging receiver of claim 10 further comprising means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first signal of said sequence of N paging signals at the end of its associated time interval.

13. The improved radio paging receiver of claim 10 further comprising means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first signal of said sequence of N paging signals during a predetermined time period following a failure by said programmable signal detection means to detect any other paging signal of said sequence of N paging signals during its respective time interval.

14. The improved paging receiver of claim 10 further comprising:

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said preamble signal at the end of said two time periods, and

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal of said sequence of N paging signals during said third time interval.

15. The improved paging receiver of claim 10 further comprising:

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said preamble signal at the end of said two time periods, and

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal of said sequence of N paging signals during a predetermined time period following a failure by said programmable signal detection means to detect any other paging signal of said sequence during its respective time interval.

16. The improved paging receiver of claim 10 further comprising:

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal during its associated time interval, and

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal after a predetermined time period following a failure by said programmable signal detection means to detect any other paging signal of said sequence during its respective time interval.

17. The improved paging receiver of claim 10 further comprising:

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said preamble signal at the end of said two time periods, means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal during its associated time interval, and

means for deactivating said paging radio receiver in response to the failure by said programmable signal detection means to detect said first paging signal after a predetermined time period following a failure by said programmable signal detection means to detect any other paging signal of said sequence during its respective time interval.

18. The improved radio paging receiver of any of claims 10, 11, 12, 13, 14, 15, 16, or 17 wherein said means for activating comprises means for periodically and recurrently activating said paging radio receiver at intervals less than the duration of said preamble signal.

39. A paging radio receiver according to any of claims 10, 11, 12, 13, 14, 15, 16, or 17 wherein said preamble signal is a tone signal.

40. A paging radio receiver according to claims 10, 11, 12, 13, 14, 15, 16, or 17 wherein said paging signals are tone signals.

41. A paging radio receiver according to any of claims 10, 11, 12, 13, 14, 15, 16, or 17 wherein said preamble and paging signals are tone signals.

42. A paging radio receiver according to claim 18 wherein said preamble signal is a tone signal.

43. A paging radio receiver according to claim 18 wherein said paging signals are tone signals.

44. A paging radio receiver according to claim 18 wherein said preamble and paging signals are tone signals.

19. A method for selectively programming a radio receiver to be receptive to a predetermined preamble signal followed by a plurality of sequential predetermined paging signals, comprising the steps of:

a. first causing said receiver to be receptive in a sequential manner to said plurality of sequential predetermined paging signals at a first rate sufficiently rapid to prevent detection of said paging signals;

b. second causing said receiver to be receptive to said predetermined preamble signal; and

c. third, in response to detection of said predetermined preamble signal, causing said receiver to be receptive in a sequential manner to said plurality of predetermined paging signals at a second rate slower than said first rate said second rate being sufficiently slow to permit detection of said paging signals.

20. The method of claim 19 wherein said third step causes said receiver to be receptive to each predetermined paging signal in said paging signal sequence in response to detection of the previous predetermined paging signal in said paging signal sequence.

45. A battery saving paging receiver for producing a page in response to a predetermined sequential signal code having at least first, second, and third signals comprising:

a receiver for receiving and detecting said signals;

a battery saver coupled to said receiver for supplying operating power thereto after a predetermined interval of time during which operating power was not applied;

first means for detecting said first signal;

second means, responsive to the detection of said first signal, for thereafter detecting the termination of said first signal and establishing, in response to said termination, a first time window related to the termination of said first signal;

third means for detecting said second signal during said first time window and for establishing, in response to the detection of said second signal during said first time window, a second time window related to said first time window;

fourth means for detecting said third signal during said second time window and producing, in response thereto, a page;

fifth means, responsive to a failure to detect said third signal during said second time window, for establishing a third time window for the detection of said second signal and

sixth means, responsive to a failure to detect said second signal during said third time window, for turning off said battery saver to eliminate power to said receiver.

46. A battery saving paging receiver according to claim 45 wherein said first time window is larger than said second time window but is smaller than said third interval of time window.

47. A battery saving paging receiver according to either of claims 45 or 46 wherein said first, second, and third signals are tones.

48. A paging receiver operable in either a first battery save mode or a second mode, said first battery save mode of operation for responding to a predetermined preamble signal followed by a predetermined sequence of paging signals and said second mode of operation for responding to said predetermined sequence of paging signals only, comprising:

first means for selecting one of said two modes of operation;

a battery saver circuit for applying power from a power source to selected circuits of said paging receiver after each period of removed power occurring for a predetermined first interval of time and for removing power from said selected circuits in response to a battery saver control signal;

second means, responsive to the selection of said first mode by said means for selecting, for causing said battery saver circuit to apply power to the selected circuits

means for receiving said preamble and paging signals,

programmable signal detection means, coupled to said means for receiving, for selectively detecting the presence of said preamble and paging signals;

third means, responsive to the application of power by said battery saver circuit, for causing said signal detection means to be responsive to said preamble signal;

fourth means, responsive to the detection of said preamble signal for detecting the end of said preamble signal;

fifth means, responsive to the detection of the end of said preamble signal by said fourth means, for detecting the first paging signal of said predetermined sequence;

sixth means, responsive to the detection of the first paging signal of said sequence for causing said signal detection means to be sequentially responsive to each of the second through last paging signal of said sequence;

seventh means, responsive to the detection of all of the paging signals of said predetermined sequence, for producing a page;

eighth means, responsive to a failure to detect any of the second through last paging signals of said sequence, for causing said signal detection means to be responsive during a second time interval to the first paging signal of said sequence;

ninth means, responsive to a detection of the first paging signal during said second time interval, for causing said signal detection means to be sequentially responsive to each of the second through last paging signals of said sequence;

tenth means, responsive to a failure to detect the first paging signal during the second time interval, for generating said battery saver control signal to turn off the battery saver circuit;

eleventh means, responsive to the selection of said second mode for supplying power to the receiver and causing said signal detection means to be responsive to the first paging signal of said sequence until the first paging signal is detected;

twelfth means, responsive to the detection of the first signal by said eleventh means, for causing said signal detection means to be sequentially responsive to each of the second through last paging signals of said sequence; and

thirteenth means, responsive to the selection of said second mode and to a failure to detect by said twelfth means of any of the second through last paging signals of said sequence, for causing said signal detection means to be responsive to the first signal of said sequence.

49. A paging receiver according to claim 48 wherein said preamble signal is a tone signal.

50. A paging receiver according to claim 48 wherein said paging signals are tone signals.

51. A paging receiver according to claim 48 wherein said preamble signal and said paging signals are tone signals.

52. A paging radio receiver for receiving a preamble signal having a predetermined period followed by a predetermined sequence of paging signals and providing an indication of such reception, comprising:

means, normally unpowered, for receiving, when powered, the predetermined preamble and paging signals;

a programmable detection means coupled to said means for receiving;

control means, coupled to said programmable detection means for,

(a) programming the detection means to be responsive to the predetermined sequence of paging signals, the sequencing resulting from the first programming occurring at a rate sufficiently rapid to prevent detection of said paging signals,

(b) programming the detection means to be responsive to the predetermined preamble signal,

(c) detecting the end of the predetermined preamble signal, and

(d) in response to the end of the predetermined preamble signal being detected by the detection means, for programming the detection means to be responsive to the predetermined sequence of paging signals;

means, coupled to said control means, for providing a page in response to detection of the predetermined sequence of paging signals by said detection means; and

means for periodically applying power to said means for receiving the application of power occurring at intervals of time less than the predetermined period of the preamble signal.

53. A paging radio receiver according to claim 52 wherein said predetermined preamble and paging signals are tones and said programmable detection means is a programmable filter.

54. A battery saving paging receiver for producing a page in response to a predetermined sequential signal code having at least first, second, and third signals comprising:

a receiver for receiving and detecting said signals;

a battery saver coupled to said receiver for providing operating power thereto after a predetermined interval of time during which operating power was not applied;

first means coupled to said receiver and battery saver for detecting said first signal when power is supplied by said battery saver after said predetermined interval of time;

second means, responsive to the detection of said first signal, for thereafter again detecting the presence of said first signal;

third means for detecting the end of said first signal and establish a first time window;

fourth means for detecting said second signal during said first time window and for establishing, in response to the detection thereof, a second time window;

fifth means for detecting said third signal during said second time window and producing, in response to the sequential detection of at least said first, second and third signals a page;

sixth means, responsive to a failure to detect said third signal within said second time window, for detecting the presence of said second signal during a third time window; and

seventh means, responsive to a failure to detect said second signal within said third time window, for turning off said battery saver to eliminate power to said receiver.

55. A battery saving paging receiver according to claim 54 wherein said interval of time during which operating power is not supplied is larger than said second time window but is smaller than said third time window.

56. A battery saving paging receiver according to either of claims 54 and 55 wherein said first, second, and third signals are tones.

58. A method for selectively programming a radio receiver to be receptive to a predetermined preamble signal followed by a plurality of sequential predetermined paging signals, comprising the steps of:

a. first programming said receiver to be receptive to said predetermined preamble signal;

b. second, in response to detection of the presence of said predetermined preamble signal at given time instants, detecting the end of said predetermined preamble signal; and

c. after detecting the end of said preamble signal, programming said receiver in a sequential manner to be receptive to said plurality of predetermined paging signals.

59. A method according to claim 58 wherein said step (c) comprises:

in response to detection of the end of said predetermined preamble signal, programming the receiver to be receptive to the first following paging signal and therafter receptive to each succeeding paging signal in response to detection of the previous paging signal.

60. A method for producing pages in response to sequential signals of either a first or second paging signal format, said first format comprising a predetermined preamble signal followed by a plurality of sequential predetermined paging signals and said second format comprising only said sequential predetermined paging signals without a preamble, received by a receiver comprising:

programming said receiver in a sequential manner to be receptive in a sequential manner to either format of said plurality of sequential predetermined paging signals at a first rate sufficiently rapid to prevent detection of said paging signals,

programming said receiver to be receptive to said preamble signal; and

upon detection of said preamble, programming said receiver in a sequential manner to be receptive to said plurality of sequential predetermined paging signals at a second rate slower than said first rate to permit detection of said paging signals.

61. An arrangement for producing an output reponsive to a predetermined first signal followed by a predetermined second signal which are among a plural sequence of signals available from a source, comprising:

programmable signal detection means, coupled to said source, for receiving signals therefrom;

control means connected to said signal detection means for (i) first serially programming said signal detection means for enabling sequential detection of the plural sequence of signals comprising said second signal, (ii) second, serially programming said signal detection means for detecting said first signal, and (iii) third, in response to said first signal being detected by said signal detection means, serially programming said signal detection means for sequentially detecting the plural sequence comprising said second signal, and

means connected to said control means for producing said output in response to said second signal being detected by said signal detection means after the serial programming of (iii);

wherein said first programming of said signal detection means for enabling said plural sequence of signals causes said signal detection means to be responsive in a sequential manner to the signals of said sequence and this sequential responsiveness of said first programming occurs at a first rate to prevent detection of said plural sequence of signals, and wherein said second and third programming of said signal detection means causes said signal detection means to be responsive in a sequential manner to said first signal and second signal, and this sequential responsiveness of the second and third programming occurs at a second and third rate respectively to permit said signal detection means to detect said first and second signals.

62. An arrangement according to claim 61 wherein said third programming of said signal detection means for detecting said second signal programs for detecting each successive signal of said plural sequence of signals in response to the previous signal of said sequence being detected by said signal detection means.

63. An arrangement according to claim 62 or 61 wherein said control means comprises a changeable, selectively programmable device to determine each signal of said plural sequence signals and said first signal to which said arrangement will be responsive.

64. An arrangement according to claim 63 wherein said changeable, selectively programmable device is a code plug from which data is read serially.

65. An arrangement according to claim 62 or 61 further comprising battery saving means for periodically activating said source at intervals less than the time duration of said first signal.

66. An arrangement according to claim 61 wherein said second and third rates are identical and said first rate is greater than said second and third rates.

67. A radio receiver responsive to a predetermined sequence of received address signals, comprising:

means for receiving radio frequency signals and for detecting intelligence bearing signals carried therewith;

means for comparing said intelligence-bearing signals with a supplied comparison signal and for generating an output signal indicative of the signal comparison result; and

serial code plug means for supplying a predetermined serial sequence of said comparison signals to said means for comparing, wherein said intelligence bearing signals comprise a preamble signal followed by a sequence of address signals and wherein said predetermined serial sequence of comparison signals comprise a sequence of predetermined address signals followed by a predetermined preamble signal and including means for causing said serial code plug means to rapidly output said sequence of predetermined address signals upon its initial activation.

68. A radio receiver as in claim 67 further including means for causing said serial code plug means to output said sequence of predetermined address signals responsive to a subsequent actuation at a rate less than that responsive to said initial actuation.

69. A radio receiver as in claim 67 wherein said predetermined serial sequence comprises five (5) signals.

70. A radio receiver as in claim 67 wherein the output of the serial code plug responsive to said initial actuation is so rapid that the comparing means cannot detect the intelligence bearing signals.

71. A radio receiver as in claim 68 wherein the slower rate of serial code plug output responsive to a subsequent actuation is sufficiently slow to permit a comparison by said comparing means.

72. A paging receiver having a unique address comprising a predetermined sequence of paging signals, for use in a paging system including a plurality of such receivers, comprising;

means for receiving address messages; and

means or comparing the received address messages with its unique address and actuating an alarm if the unique address is received;

the comparing means comprising a digital signal detector for determining the presence or absence of a particular paging signal during a predetermined interval of time; and

a serial code plug for programming the signal detector to be responsive to the paging signals in a predetermined manner, wherein the unique address comprises a preamble signal followed by a predetermined sequence of paging signals and wherein the serial code plug is arranged to (a) first rapidly program the signal detector at such a rate that paging signals cannot be detected, then (b) program the signal detector to detect the preamble signal.

73. A paging receiver according to claim 72 wherein the serial code is further arranged to (c) after step (b), program the signal detector at a sufficiently slow rate to be responsive to the predetermined sequence of paging signals.

74. A paging receiver as in claim 72 wherein the address comprises a sequence of five (5) paging signals.

75. A paging receiver as in claim 72 wherein the address comprises a preamble signal followed by a sequence of five (5) paging signals.