Paging receiver with a display function that inhibits display of a received command signal

• US 4,959,644 A
• Filed: 09/08/1988
• Issued: 09/25/1990
• Est. Priority Date: 09/14/1987
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sato, Toshifumi
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Pudpud, E. O.
• Application Number:
  US07/242,063
• Time in Patent Office: 747 Days
• Field of Search: 340/825.44, 340/825.47, 340/825.48, 340/825.52, 340/311.1, 455/31, 455/38
• US Class Current: 340/7.55
• CPC Class Codes: G08B 5/224 Paging receivers with visible signalling details
• CPC Class Codes: G08B 5/229 with other provisions not elsewhere provided for
• CPC Class Codes: H04W 88/023 with message or information receiving capability

Abstract

A paging receiver with a display function allows a conventional message to be displayed and a receiver control signal to be sent together in a single message format. A first and a second predetermined character are detected in a received message. A message occurring between the first and second characters is extracted as a receiver control signal and is not displayed on a display.

Claims

1. A paging receiver with a display function comprising:

non-volatile memory means for storing an identification in the paging receiver and for storing an operational mode of said receiver, said identification being preassigned to said receiver as its own paging signal;

receiving means for receiving and demodulating a carrier wave which has been modulated by a paging signal and a message signal which follows the paging signal and contains a message, thereby producing a demodulated paging signal, the character signals S₁ and S₂ capable of being inserted in any position in a message signal, but only when control data is necessary;

all of the ordinary messages, signals s₁ and s₂, and control data having the same format;

decoding means for comparing the demodulated paging signal and a predetermined station'"'"'s own paging signal and, if the demodulated and station'"'"'s own paging signals are coincident, outputting the message signal which follows the paging signal;

alerting means for alerting a user of said receiver to a reception of a call, said alerting being by sound, light or similar means;

displaying means for displaying the message received; and

control means responsive to the message signal from said decoding means for controlling said alerting means and causing said displaying means to display the message;

said control means being provided with message reception control means which comprises first comparing means for comparing a predetermined first representative of the character signal S₁ character with the message contained in the message signal which is inputted from said decoding means, second comparing means for comparing the message received with a predetermined second representative of the character signal S₂ character, and switch means for extracting the received message which appears during a period beginning with an instant when said first comparing means detects the first character in the received message and ends with an instant when said second comparing means detects the second character in the received message;

the message extracted by said message reception control means being treated as a receiver control signal which is not displayed by said displaying means.

2. A paging receiver with a display function comprising:

non-volatile memory means for storing an identification in the paging receiver and for storing an operational mode of said receiver, said identification being preassigned to said receiver as its own paging signal;

receiving means for receiving and demodulating a carrier wave which has been modulated by a paging signal and a message signal which follows the paging signal and contains a message, thereby producing a demodulated paging signal;

decoding means for comparing the demodulated paging signal and a predetermined station'"'"'s own paging signal and, if the demodulated and station'"'"'s own paging signals are coincident, outputting the message signal which follows the paging signal;

alerting means for alerting a user of said receiver to a reception of a call, said alerting being by sound, light or similar means;

displaying means for displaying the message received; and

control means responsive to the message signal from said decoding means for controlling said alerting means and causing said displaying means to display the message;

said control means being provided with message reception control means which comprises first comparing means for comparing a predetermined first character with the message contained in the message signal which is inputted from said decoding means, second comparing means for comparing the message received with a predetermined second character, and switch means for extracting the received message which appears during a period beginning with an instant when said first comparing means detects the first character in the received message and ends with an instant when said second comparing means detects the second character in the received message;

the message extracted by said message reception control means being treated as a receiver control signal which is not displayed by said displaying means;

said switch means comprising;

a delay circuit for delaying a second character detect output of said second comparing means by a period of time which is associated with one character;

an inverter for inverting a signal which shows that reception of a message is under way;

an OR gate for ORing of an output of said delay circuit and an output of said inverter;

a flip-flop circuit to which a first character detect output of said first comparing means and an output of said OR gate are applied;

an AND gate for producing a selection signal by ANDing a signal which appears during reception of the message and an output of said flip-flop;

and a switch for ouputting the extracted message only when the selection signal is active.

3. A method of paging a subscriber equipped with a paging receiver having a display function, said method comprising the steps of:

(a) storing in a paging receiver an address signal which is preassigned to identify it;

(b) demodulating in said receiver a received signal which includes a paging signal followed by a message signal transmitted in a single format, said demodulated message signal including a message signal d₁ containing first and second signals S₁ and S₂ which respectively mark a beginning and an end of a receiver command control signal period;

(c) comparing said stored address signal with said demodulated paging signal to determine whether the call is directed to the receiver, comparing stored characters S₁ and S₂ with the message signal d₁ and introducing a measured delay responsive to said signals S₁ and S₂ for providing a measured time period which is said receiver command control signal period;

(d) displaying the demodulated message signal in response to said comparison of step (c) finding that said demodulated paging signal is the same as said stored address signal;

(e) giving alert signal in response to said comparison of step (c) finding that said demodulated paging signal is the same as said stored address signal and

(f) switching a circuit to inhibit a display responsive to any signals which appear in said message signal d₁ between said first and second signals S₁, S₂ while enabling a display responsive to any signals which appear in said signal format after said signal S₂ in response to a detection of a call to said receiver during step (c).

4. The method of claim 3 and the added step of providing predetermined but unused characters in said received signals, whereby said unused characters are available for additional functions in the future.