Dual mode receiver having battery saving capability

• US 5,239,306 A
• Filed: 10/05/1992
• Issued: 08/24/1993
• Est. Priority Date: 12/24/1990
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Siwiak, Kazimierz, Schwendeman, Robert J., Leitch, Clifford D.
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Magistre, Dervis
• Application Number:
  US07/956,562
• Time in Patent Office: 323 Days
• Field of Search: 340/311.1, 340/825.44, 340/825.47, 340/825.48, 375/5, 455/38.1, 455/38.3, 455/142, 455/143, 455/343, 455/33.4
• US Class Current: 340/7.35
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: H04W 8/245 from a network towards a terminal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A dual mode communication receiver a receiver for receiving information transmitted in a first and second modulation format on a common channel, a first demodulator for detecting information transmitted in the first modulation format, and a second demodulator, responsive to the information detected in the first modulation format, for detecting information transmitted in the second modulation format. A power conservation circuit is also provided for selectively supplying power to the first and second demodulators for enabling the detecting of the information transmitted in the first modulation format and the second modulation format, respectively.

Claims

1. A dual mode communication receiver, comprising:

means for receiving information transmitted on a common channel in a first and second modulation format;

first means for detecting the information transmitted in the first modulation format on the common channel; and

second means, responsive to the information detected in the first modulation format, for detecting the information transmitted in the second modulation format.

2. The dual mode selective call receiver according to claim 1, wherein the first modulation format is frequency shift keyed FM modulation.

3. The dual mode communication receiver according to claim 1, wherein the second modulation format is a linear modulation format.

4. The dual mode communication receiver according to claim 3, wherein the linear modulation format is spectrally efficient digital modulation.

5. The dual mode communication receiver according to claim 3, wherein the linear modulation format is QAM modulation.

6. The dual mode communication receiver according to claim 2 wherein the information transmitted in the first modulation format includes selective call address information, and wherein said dual mode communication receiver further comprises:

means for decoding at least one predetermined address to which the communication receiver is responsive; and

means for generating and delivering an alert signal when the address information decoded matches the predetermined address information stored.

7. The dual mode communication receiver according to claim 1, wherein the information transmitted in the first modulation format is transmitted in a first signaling format.

8. The dual mode communication receiver according to claim 1, wherein the information transmitted in the second modulation format is transmitted in a second signaling format.

9. The dual mode communication receiver according to claim 1, wherein the information transmitted in the second modulation format is transmitted on a second receiver frequency.

10. The dual mode communication receiver according to claim 7 wherein the information transmitted in the first modulation format further includes message information, said first receiver means comprises means for demodulating the received message information, and wherein said dual mode communication receiver further comprises:

means for storing the message information received in the first modulation format when the address information detected matches the predetermined address information stored; and

means for presenting the stored message information for review.

11. The dual mode communication receiver according to claim 10, wherein the address information received in the first modulation format identifies a tone only page.

12. The dual mode communication receiver according to claim 10, wherein the message information received in the first modulation format is a numeric data message.

13. The dual mode communication receiver according to claim 10, wherein the message information received in the first modulation format is an alphanumeric data message.

14. The dual mode communication receiver according to claim 10 wherein the information transmitted in the second modulation format includes message information, said second receiver means comprises means for demodulating the received message information, and wherein said dual mode communication receiver further comprises:

means for storing the message information detected in the second modulation format when the address information detected in the first modulation format matches the predetermined address information stored; and

means for presenting the stored message information.

15. The dual mode communication receiver according to claim 14 wherein said means for presenting comprises a liquid crystal display for displaying the received information.

16. The dual mode communication receiver according to claim 14 wherein said means for presenting comprises:

processing means for processing the stored message information into an analog voice signal; and

delivery means for delivering the analog voice signal.

17. The dual mode communication receiver according to claim 14 wherein the message information detected in the second modulation format is an analog signal, and wherein said means for storing comprises:

converter means for converting the analog message information into digital message information;

storage controlling means, responsive to the analog message information being converted into digital message information, for controlling the storage of the digital message information into said message storing means.

18. The dual mode communication receiver according to claim 17 wherein said converter means is an analog to digital converter.

19. The dual mode communication receiver according to claim 14 wherein the message information detected in the second modulation format is high speed data information.

20. The dual mode communication receiver according to claim 19 wherein the high speed data information is transmitted at a data rate in excess of 1200 bits per second.

21. The dual mode communication receiver according to claim 14 wherein the message information detected in the second modulation format is voice information.

22. The dual mode communication receiver according to claim 21 wherein the voice information is digitized at a rate of at least 8 kilobits per second.

23. A dual mode communication receiver comprising:

means for receiving information transmitted on a common channel in a first and second modulation format;

first means for detecting the information transmitted in the first modulation format on the common channel;

second means, responsive to the information detected in the first modulation format, for detecting the information transmitted in the second modulation format; and

third means, for supplying power to said receiving means for enabling the receiving of the information transmitted in the first and second modulation format

said third means, further for supplying power to said first means for enabling the detecting of the information transmitted in the first modulation format;

said third means further in response to the information detected in the first modulation format, supplies power to said second means for enabling the detecting of the information transmitted in the second modulation format.

24. The dual mode communication receiver according to claim 23 wherein said third means supplies power to said second receiving means in response to predetermined information being received and detected in the first modulation format, and suspends the supply of power to said first receiving means.

25. The dual mode communication receiver according to claim 23, wherein said first receiving means comprises:

a receiver section for receiving information transmitted in the first modulation format; and

a first demodulator means for demodulating the information received in the first modulation format,

and wherein said third means supplies power to said receiver section and to said first demodulator means for receiving information transmitted in the first modulation format.

26. The dual mode communication receiver according to claim 23, wherein said second receiving means comprises

a second demodulator means for demodulating the information received in the second modulation format,

and wherein said third means further supplies power to said receiver section and to said second demodulator means for receiving information transmitted in the second modulation format.

27. The dual mode communication receiver according to claim 23, wherein said second receiving means comprises

a digital storage means for storing the information received in the second modulation format,

and wherein said third means further supplies power to said digital storage means for enabling the storing of the information received in the second modulation format.

28. A dual mode communication receiver, comprising:

means for receiving information transmitted in a FM modulation format and a linear modulation format;

first means for detecting the information transmitted in the FM modulation format; and

second means, responsive to the information detected in the FM modulation format, for detecting the information transmitted in the linear modulation format.

29. The dual mode communication receiver according to claim 28, wherein the FM modulation format utilizes frequency shift keying.

30. The dual mode communication receiver according to claim 28, wherein the linear modulation format is spectrally efficient digital modulation.

31. The dual mode communication receiver according to claim 28, wherein the linear modulation format is QAM modulation.

32. The dual mode communication receiver according to claim 28, wherein the information transmitted in the first modulation format is transmitted in a first signaling format.

33. The dual mode communication receiver according to claim 28, wherein the information transmitted in the second modulation format is transmitted in a second signaling format.

34. The dual mode communication receiver according to claim 28, wherein the information transmitted in the second modulation format is transmitted on a second receiver frequency.

35. A dual mode communication receiver comprising:

means for receiving information transmitted in a FM modulation format and a linear modulation format;

first means for detecting the information transmitted in the FM modulation format;

second means, responsive to the information detected in the FM modulation format, for detecting the information transmitted in the linear modulation format; and

third means, for supplying power to said receiving means for enabling the receiving of the information transmitted in the FM and linear modulation formats,

said third means, further for supplying power to said first means for enabling the detecting of the information transmitted in the FM modulation format;

said third means further in response to the information detected in the FM modulation format, supplies power to said second means for enabling the detecting of the information transmitted in the linear modulation format.