Method and apparatus for receiving selected paging signal

Claim 1

A method for receiving a paging signal, composed of a first code, and a plurality of code series, the first code being a preamble which occurs prior to the plurality of code series, each code series including a second code constituting a sync code and a third code intermittently received by a receiving unit, the receiving unit being composed of a sync signal generating means for intermittently outputting a sync signal in a repetition period of the second code independent of detection operations of the respective codes, said method comprising: (i) every time the sync signal of said sync signal generating means is produced, operating said receiving unit only for a constant time to enable said receiving unit to detect said first code and said second code; (ii) in response to detection of a first code, resetting said sync signal generating means to repeat step (i); (iii) in response to detection of the second code operating said receiving unit only for a predetermined time period after the detection of said second code, and causing said receiving unit to enter into a detection operation for said third code; (iv) in response to failure to detect said second code after step (iii), repeating steps (i), (ii) and (iii); and (v) in response to detection of said third code in step (iii), displaying information contained in said third code.

Claim 2

A method for receiving a paging signal, composed of a first code, and a plurality of code series, the first code being a preamble which occurs prior to the plurality of code series, each code series including a second code constituting a sync code and a third code intermittently received by a receiving unit, the receiving unit being composed of a sync signal generating means for intermittently outputting a sync signal in a repetition period of the second code independent of detection operations of the respective codes, said method comprising: (i) every time the sync signal of said sync signal generating means is produced, operating said receiving unit only for a constant time to enable said receiving unit to detect said first code and said second code; (ii) in response to detection of a first code, resetting said sync signal generating means to repeat step (i); (iii) in response to detection of the second code operating said receiving unit only for a predetermined time period after the detection of said second code, and causing said receiving unit to enter into a detection operation for said third code; (iv) in response to failure to detect said second code after step (iii), repeating steps (i), (ii) and (iii); and (v) in response to detection of said third code in step (iii), displaying information contained in said third code.

Claim 10

An apparatus for receiving a selected paging signal, the paging signal being a code system composed of a first code followed by a plurality of code series which are periodically continued, each code series being composed of a second code for constituting a sync code and a third code which is intermittently received by a receiving unit, and a preselected form of the third code is selectively received, said apparatus comprising: a receiving means (2) for receiving the selected paging signal; a first code detecting means (3) for receiving the paging signal from said receiving means (2); a second code detecting means (4); a third code detecting means (5); a sync signal generating means (6) for continuously generating a repetition signal having the same time period as that of said second code of the paging signal; a first timing generating means (7) for generating a signal having a time width for detecting the second code in synchronism with the output from said sync signal generating means; a second timing generating means (8) for generating a signal having a time width for detecting the third code in synchronism with the output from said sync signal generating means (6) when an output instruction signal is received from said second code detecting means (4); a switch means (9) for supplying operating power to said receiving means (2) during time periods when said first timing generating means (7) and said second timing generating means (8) are generating a signal; and a display means (11) for displaying the output from said third code detecting means (5), wherein: said first code detecting means (3) outputs a reset signal to said sync signal generating means (6) when the first code is detected; said second code detecting means (4) performs the detection operation of the second code during the signal generation period of said first timing generating means (7), sends the output instruction signal to said second timing generating means (8) when the second code is detected, and also sends an output stop signal to said second timing generating means (8) when the second code is not detected; and said third code detecting means (5) performs the detection operation of the third code during the signal generation period of said second timing generating means (8).

Claim 11

An apparatus for receiving a selected paging signal, the paging signal being a code system composed of a first code followed by a plurality of code series which are periodically continued, each code series being composed of a second code for constituting a sync code and a third code which is intermittently received by a receiving unit, and a preselected form of the third code is selectively received, said apparatus comprising: a receiving means (2) for receiving the selected paging signal; a first code detecting means (3) for receiving the paging signal from said receiving means (2); a second code detecting means (4); a third code detecting means (5); a sync signal generating means (6) for continuously generating a repetition signal having the same time period as that of said second code of the paging signal; a first timing generating means (7) for generating a signal having a time width for detecting the second code in synchronism with the output from said sync signal generating means; a second timing generating means (8) for generating a signal having a time width for detecting the third code in synchronism with the output from said sync signal generating means (6) when an output instruction signal is received from said second code detecting means (4); a switch means (9) for supplying operating power to said receiving means (2) during time periods when said first timing generating means (7) and said second timing generating means (8) are generating a signal; and a display means (11) for displaying the output from said third code detecting means (5), wherein: said first code detecting means (3) outputs a reset signal to said sync signal generating means (6) when the first code is detected; said second code detecting means (4) performs the detection operation of the second code during the signal generation period of said first timing generating means (7), sends the output instruction signal to said second timing generating means (8) when the second code is detected, and also sends an output stop signal to said second timing generating means (8) when the second code is not detected; and said third code detecting means (5) performs the detection operation of the third code during the signal generation period of said second timing generating means (8).