Paging receiver having a plurality of test modes

• US 4,720,710 A
• Filed: 06/20/1983
• Issued: 01/19/1988
• Est. Priority Date: 06/18/1982
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ichikawa, Yoshio, Akahori, Masaaki
• Primary Examiner(s): Weldon, Ulysses
• Application Number:
  US06/506,131
• Time in Patent Office: 1,674 Days
• Field of Search: 340/825.44, 340/825.04, 340/825.1, 340/825.39, 340/825.47, 340/825.48, 340/825.71, 340/311.1, 455/54, 455/67, 455/226, 455/343, 455/228, 455/31, 455/38
• US Class Current: 340/7.38
• CPC Class Codes: H04B 1/1607 Supply circuits converters H02M; filters therefor H02M1/14; voltage stabilisers G05F1/46
• CPC Class Codes: H04W 24/06 Testing, supervising or monitoring using simulated traffic
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A testable pager including a receiver for demodulating a sequence of signals, and a manually operated switch. A controller receives the outputs of the receiver and the switch. The controller thereby switches on a power supply for the receiver for a set period after the start of the signal sequence. When the sequence includes a test code, the power supply stays on and a first test is performed. Actuations of the switch cause further tests to be made.

Claims

1. A paging receiver comprising:

receiving section means for receiving a carrier wave modulated with a calling signal including a first signal sequence and either a second or a third signal sequence which follows said first signal sequence;

power supply control means for supplying power to said receiving section means when said power supply control means receives a first control signal;

controller section means for supplying said first control signal to said power supply control means for only a first predetermined time period when said controller section means detects said first signal sequence so that said controller section means can detect said second or third signal sequence, supplying said first control signal to said power supply control means in order to shift said receiver to a first test mode when said third signal sequence is detected, shifting said receiver from said first test mode to a final test mode when said controller section means receives a second control signal, reshifting said receiver from said final test mode to normal operation when said controller section means detects a third control signal and inhibiting said receiver from shifting to said first test mode if said third signal sequence is not received within a second predetermined time period either from the turning-on of said receiver or from the reshifting of said receiver to normal operation; and

switch means connected to said controller section means for generating said second and third control signals.

2. A paging receiver as claimed in claim 1, further comprising:

means for storing a calling code assigned to said receiver; and

annunciator means for generating an audible tone when said annunciator means receives an alarm signal; and

wherein said controller section means includes means to shift said receiver from said first test mode to a second and a third test mode, respectively, before said receiver shifts to said final test mode when said controller section means receives a fourth and a fifth control signal, to shift said receiver from said third test mode to said final test mode when said controller section means receives said second control signal, to supply said alarm signal to said annunciator means when said controller section means detects said second or third signal sequence during said second test mode, to supply said display means with said calling code stored in said memory means and a coded data indicative of the functions of said receiver during said third and final test modes and to suspend the supply of said first control signal to said receiving section means during said third and final test modes; and

wherein said switch means includes means to generate said fourth and fifth control signals.

3. A paging receiver as claimed in claim 2 wherein said controller section means includes a programmed microcomputer to execute the steps of:

(a) detecting said first signal sequence;

(b) detecting said second signal sequence to generate said alarm signal;

(c) detecting said third signal sequence to shift said receiver to said first test mode;

(d) shifting said receiver to said second, third and final test modes respectively when said controller section means receives said fourth, fifth and second control signals;

(e) inhibiting the supply of said first control signal to said power supply control means during said third and final test modes;

(f) restoring said receiver from said final test mode to normal operation when said controller section means receives said third control signal; and

(g) inhibiting said receiver from shifting to said first test mode if said third signal sequence is not received within said second predetermined period from a time at which either the power of said receiver is turned on or said receiver is stored to said normal operation.

4. A paging receiver as claimed in claim 2 wherein said third signal sequence is identical to said second signal sequence during said second test mode.

5. A paging receiver as claimed in claim 3 wherein said calling signal contains a plurality of said second signal sequences which are divided into a plurality of groups and said third signal sequence is allotted to the beginning of said plurality of groups.

6. A test method for a receiver with battery saving function, said method comprising the steps of:

(a) suspending said battery saving function and shifting said receiver to a first test mode when said receiver receives a test code;

(b) shifting said receiver from said first test mode to a final test mode by means of a switch incorporated in said receiver;

(c) reshifting said receiver from said final test mode to the normal operation means of said switch; and

(d) inhibiting said receiver from shifting to said first and other plurality of test modes if said test code is not received within a predetermined period of time either from the turning-on of said receiver or from the shifting to said normal operation.

7. A method as claimed in claim 6 further including the steps of:

(e) serially shifting said receiver from said first test mode to a second and third test mode respectively, by means of said switch before said receiver shifts to said final test mode;

(f) conducting the test of a receiving section of said receiver during said first test mode;

(g) conducting the test of the receiving sensitivity of said receiver and of a display device of said receiver and confirming the functions of said receiver and the memory content of a memory section of said receiver during said second, third and final test modes; and

(h) restoring said battery saving function during the time of the test of said display device or of checking of said receiver functions and the memory content of said memory section.