Encoder for transmitted message activation code

• US 4,427,980 A
• Filed: 10/13/1981
• Issued: 01/24/1984
• Est. Priority Date: 10/13/1981
• Status: Expired due to Term

• Current Assignee: Schaumburg IL
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Fennell, Robert D., Bailey, David F., Weidler, Allen J.
• Primary Examiner(s): YUSKO, DONALD
• Application Number:
  US06/310,591
• Time in Patent Office: 833 Days
• Field of Search: 340/825.52, 340/825.47, 340/825.44, 340/311.1, 179/2 EC, 455/70, 455/54, 455/53, 455/49, 455/48
• US Class Current: 370/432
• CPC Class Codes: H04W 88/187 using digital or pulse address codes
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The encoder which preferably produces a transmitted digital word which serves as an activation code for a single receiver or a group of receivers. The activation code effects only the receiver(s) that have previously detected their digital address and are therefore prepared to enter a message receive state. The activation code transmitted by the encoder will cue the receiver(s) simultaneously thereby allowing the encoder to send a single message to a plurality of receivers. The activation code also allows the encoder to interleave messages to receivers by utilizing the customary transmitter down time in a single message transmission. During this down time, the activation code allows the transmitter to begin transmission of a second message to a second receiver. The use of the activation code to interleave messages is especially important in tone and voice transmissions since it significantly increases the efficiency of a heavily loaded system.

Claims

1. A method of encoding information signals including a receiver address, for transmission of information to a plural population of receivers, each said receiver being capable of selectively establishing more than one time period for address correlation and having a predetermined alert sequence, comprising the steps of:

generating a first set of coded signals to establish one of at least a first and second time period for said plural population of receivers to correlate for an address;

generating a second set of coded signals to select at least one selected receiver of said plural receiver population.

2. A method of encoding, according to claim 1, further comprising the step of:

generating a first activation code signal subsequent to said second set of coded signals for activating the predetermined alert sequence of said at least one selected receiver.

3. A method of encoding, according to claim 2, further comprising the step of:

generating additional said first and second sets of coded signals for at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

4. A method of encoding, according to claim 1, wherein said step of generating a first set of coded signals includes the steps of:

generating one of a preamble signal and an inverted preamble signal thereby selecting one of the first and second time periods, respectively, of said at least one selected receiver.

5. A method of encoding, according to claim 4, wherein:

selecting said first time period causes at least one selected receiver to correlate only one said second set of coded signals, and

selecting said second time period causes said at least one selected receiver to correlate a plurality of second sets of coded signals.

6. A method of encoding, according to claim 1, further comprising the steps of:

generating a third set of coded signals for causing said at least one selected receiver to continue to correlate for an address; and

generating at least one additional second set of coded signals for selecting at least one selected other receiver of said plural receiver population.

7. A method of encoding information signals including a receiver address for transmission of information to a plural population of receivers, each said receiver being capable of selectively establishing more than one time period for address correlation and having a predetermined alert sequence, comprising the steps of:

generating a first set of coded signals for selecting at least one selected receiver of said plural receiver population;

generating a first activation code signal subsequent to said first set of coded signals for activating the predetermined alert sequence of said at least one selected receiver;

generating at least a second set of coded signals for selecting at least one other selected receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

8. A method for encoding information signals including a receiver address for transmission of information to a plural population of receivers, each said receiver having a predetermined alert sequence, comprising the steps of:

generating coded signals for selecting at least one selected receiver of said plural receiver population; and

generating a first activation code signal subsequent to said coded signals for activating the predetermined alert sequence of said at least one selected receiver.

9. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver being capable of establishing more than one time period for address correlation and having predetermined alert sequence, comprising:

means for generating a first set of coded signals for selecting one of at least a first and second time period for said plural population of receivers to correlate for an address;

means for generating a second set of coded signals for selecting at least one selected receiver of said plural receiver population.

10. An encoding device, according to claim 9, further comprising:

means for generating a first activation code signal subsequent to said second set of coded signals for activating the predetermined alert sequence of said at least one selected receiver.

11. An encoding device, according to claim 10, further comprising:

means for generating additional first and second sets of coded signals for at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

12. An encoding device, according to claim 11, wherein:

said means for generating a first set of coded signals generates one of a preamble and an inverted preamble to select one of the first and second time periods, respectively, of said at least one selected receiver.

13. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver having a predetermined alert sequence, comprising:

means for generating coded signals for selecting at least one selected receiver of said plural receiver population;

means for generating a first activation code signal subsequent to said coded signals for activating a predetermined alert sequence of said at least one selected receiver.

14. An encoding device for generating sequential code signals which are to be transmitted to a plural population of receivers, each said receiver having predetermined alert sequence, comprising:

means for generating a first set of coded signals for selecting at least one selected receiver of said plural receiver population;

means for generating a first activation code signal subsequent to said first set of coded signals for activating the predetermined alert sequence of said at least one selected receiver; and

means for generating at least a second set of coded signals for selecting at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

15. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver capable of selectively establishing more than one time period for address correlation and having a predetermined alert sequence, comprising:

selecting means for storing and selecting the code signals to be transmitted, said code signals including a first set of coded signals to select one of at least a first and second time period for said plural population of receivers to correlate at least one address, a second set of coded signals to address at least one selected receiver of said plural receiver population, and a first activation code signal for activating the predetermined alert sequence of said at least one selected receiver;

transmitter means, connected to said selecting means, for transmitting said selected code signals;

control circuit means, connected to said selecting means and said transmitter means,

for enabling said selecting means to generate a selected first set of coded signals to select one of at least a first and second time period for said plural population of receivers to correlate at least one address,

for enabling said selecting means to generate a selected second set of coded signals to address at least one selected receiver of said plural receiver population,

for enabling said selecting means to generate a first activation code signal subsequent to said selected second set of coded signals for activating the predetermined alert sequence of said at least one selected receiver,

for enabling said selecting means to generate additional selected first and second sets of code signals for at least one other selected receiver, and

for enabling said selecting means to generate at least an additional selected second set of coded signals to address at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver, in accordance with said selecting means.

16. An encoding device, according to claim 15, further comprising:

a voice receiving means, connected to said transmitter means and said control circuit means, for receiving and storing a voice message;

said control circuit means for further controlling the sequence of transmission of said voice message and said code signals.

17. An encoding device, according to claim 16, wherein said selecting means further comprises:

a keyboard having selection keys and a page control key;

a keyboard decoder, connected to said keyboard, for decoding signals from said keyboard;

a word file memory, connected to said keyboard decoder and said control circuit means, for storing and generating coded signals in response to said keyboard decoder and said control circuit means; and

a shift register means, connected to said word file memory and said control circuit means, for generating serial code signals.

18. An encoding device according to claim 17, wherein said control circuit means, further comprises:

a programmable logic array circuit having a programmable timer for controlling the duration of preselected portions of said code signals and the duration of transmission of said voice message;

a timer, connected to said programmable logic array circuit and said shift register means, for providing a time base thereof; and

a switching means, connected to said transmitter means, said voice receiving means, said shift register and said programmable logic array circuit, for switching from the transmission by said transmitter means of said code signals to said voice messages and vice versa.

19. An encoding device, according to claim 15, wherein said selecting means comprises:

a keyboard and keyboard controller; and

a visual display device.

20. An encoding device, according to claim 19, wherein said control circuit means further comprises:

processing means for generating the code signals to be transmitted and for controlling the duration of preselected portions of said code signals and the duration of transmission of said voice message;

audio data select means, connected to said processing means, for generating an output indicating which one of said voice message and said code signals should be transmitted;

audio data detection means, connected to said processing means and said transmitter means for generating an output indicating that one of said voice signal and said code signal should be transmitted; and

switching means, connected to said processing means, said audio data select means, said voice receiving means and said transmitter means, for switching from the transmission by said transmitter means of said code signals to said voice messages and vice versa.

21. An encoding device, according to claim 16, wherein said control circuit means further comprises:

processing means for generating the code signals to be transmitted and for controlling the duration of preselected portions of said code signals and the duration of transmission of said voice message;

audio data select means, connected to said processing means, for generating an output indicating which one of said voice message and said code signals should be transmitted;

audio data detection means, connected to said processing means and said transmitter means for generating an output indicating that one of said voice signal and said code signal should be transmitted; and

switching means, connected to said processing means, said audio data select means, said voice receiving means and said transmitter means, for switching from the transmission by said transmitter means of said code signals to said voice messages and vice versa.