Radio communication apparatus in which a particular call can be surely informed to a possessor of the apparatus

In a radio communication apparatus in which an audible tone is generated (21-22) in response to reception (15-17, 19) of either a primary or a secondary call signal and stopped by a reset switch (23), the audible tone is stopped (172, 18) when the secondary call signal is received. When the primary call signal is received, the audible tone is not stopped unless the reset switch is continuously closed during a predetermined time interval. Alternatively, the audible tone is stopped when the reset switch is twice closed although the audible tone is produced again after the audible tone is stopped when the reset switch is once closed. As a further alternative, the audible tone is stopped in response to repeated closure of the reset switch without being again produced when the reset switch is once closed.

BACKGROUND OF THE INVENTION 
This invention relates to a radio communication apparatus for use in 
selectively receiving a plurality of call signals indicative of a 
plurality of call numbers, respectively. The radio communication apparatus 
may be a radio paging receiver although description will be mainly 
directed to the radio paging receiver. 
The radio paging receiver of the type described includes a receiving 
circuit for receiving, as a received signal, each of a primary and a 
secondary call signal, both specific to the receiver. The primary call 
signal is for use in carrying out a particular call of a possessor of the 
receiver. The secondary call signal is for use in carrying out a normal 
call of the possessor. The receiving circuit produces an internal signal 
whenever the receiving circuit receives each of the primary and the 
secondary call signals. 
The radio paging receiver further comprises a tone generator for generating 
an audible tone in response to the internal signal with a controllable 
volume. In order to stop the audible tone, the paging receiver comprises a 
manually operable switch which is generally called a reset switch. When 
manually operated by the possessor, the reset switch produces a tone stop 
instruction signal. Responsive to the tone stop instruction signal, the 
tone generator stops the audible tone. 
For use in making the possessor discriminate between the particular call 
from the normal call, the audible tone has a particular and a normal 
volume level which are different from one another. That is, the tone 
generator is controlled so that the particular volume level is assigned to 
the particular call and that the normal volume level is assigned to the 
normal call. Accordingly, it is possible in theory to discriminate the 
particular call from the normal call by hearing the audible tone. 
However, it is actually very difficult for the possessor to discriminate 
the particular volume level from the normal volume level by the audible 
tone. Because it is substantially impossible to exactly recognize the 
particular volume level by hearing only the audible tone without carrying 
out comparison with the normal volume level. 
In addition, the possessor may have a custom of manually operating the 
reset switch to stop the audible tone as soon as the tone generator 
generates the audible tone. This makes it impossible for the possessor to 
judge whether or not the received signal is the primary call signal. 
SUMMARY OF THE INVENTION 
It is therefore an object of this invention to provide a radio 
communication apparatus in which a particular call can be informed to a 
prossessor of the apparatus without fail. 
It is another object of this invention to provide a radio communication 
apparatus of the type described, in which information operation is clearly 
carried out as regards whether or not a currently received signal is the 
particular call of the prossessor. 
It is still another object of this invention to provide a radio 
communication apparatus of the type described, in which stop of the 
audible tone is restricted regardless of a tone stop signal when the 
particular call is received. 
Other objects of this invention will become clear as the description 
proceeds. 
On describing the gist of this invention, it is possible to understand that 
a radio communication apparatus comprises receiving means for receiving, 
as a received signal, each of a primary and a secondary call signal to 
produce an internal signal, generating means connected to the receiving 
means for generating an audible tone in response to the internal signal, 
manually operable producing means for producing a tone stop instruction 
signal, means connected to the receiving, the generating, and the manually 
operable producing means for controlling operation of the generating means 
so that the audible tone is stopped in response to the tone stop 
instruction signal, judging means connected to the receiving means for 
judging whether or not the received signal is the primary call signal, the 
judging means producing a particular signal when the received signal is 
the primary call signal, and restricting means connected to the 
generating, the manually operable producing, and the judging means for 
restricting stop of the audible tone with reference to the particular 
signal regardless of the tone stop instruction signal produced after said 
particular signal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to FIG. 1, a radio paging receiver 11 according to a first 
embodiment of this invention is for selectively receiving a plurality of 
call signals, such as a primary and a secondary call signal indicative of 
a primary and a secondary call number, respectively, which are specific to 
the receiver 11. Each of the call signals is transmitted as a radio signal 
from a transmitting station (not shown). 
The radio paging receiver 11 is for use in combination with a battery 12 
for generating electric power. The radio paging receiver 11 is connected 
to the battery 12 through a manually operable power source switch 13 and 
activated by the electric power when the switch 13 is closed to an on 
state. 
The radio signal is picked up by an antenna 14 and supplied to a radio 
section 15. When the radio section 15 is activated by the electric power 
supplied from the battery 12 through the switch 13, the radio section 15 
converts or demodulates the radio signal into a baseband or demodulated 
signal. The demodulated signal is supplied to a waveform shaper 16. The 
waveform shaper 16 is activated by the electric power to shape a waveform 
of the demodulated signal into a shaped signal of a digital waveform. The 
shaped signal supplied to a decoder 17. 
When activated by the electric power, the decoder 17 cooperates with a 
quartz crystal oscillator 18 and a P-ROM (programmable read-only memory) 
19 in response to the shaped signal to produce a call tone signal as an 
internal signal in the manner known in the art. Herein, a combination of 
the antenna 14, the radio section 15, the waveform shaper 16, and the 
decoder 17 is referred to as a receiving arrangement. 
The P-ROM 19 memorizes, as a memorized content, a primary and a secondary 
directory number signal indicative of the primary and the secondary 
directory numbers which correspond to the primary and the secondary call 
numbers, respectively. 
A loudspeaker 21 is connected to the decoder 17 through a driver circuit 22 
of, for example, an amplifier activated by the electric power. Responsive 
to each of the call tone signals, the loudspeaker 21 generates an audible 
tone with a controllable volume. That is, the loudspeaker 21 serves, in 
cooperation with the driver circuit 22, as a tone generator for generating 
the audible tone with the controllable volume. The decoder 17 comprises 
first and second timers 171 and 172 for determining a first and a second 
predetermined time duration which will later become clear. Each of the 
first and the second timers 171 and 172 is coupled to the quarts crystal 
oscillator 18 and serves as a time determining arrangement. 
A manually operable reset switch 23 is connected to the decoder 17 to 
produce a tone stop instruction signal when the reset switch 23 is closed 
to the on state by a possessor of the radio paging receiver 11. Herein, 
the reset switch 23 is referred to as a manually operable producing 
arrangement. 
Referring to FIG. 2 together with FIG. 1, operation of the decoder 17 will 
be described in detail. When the decoder 17 is supplied with the shaped 
signal from the waveform shaper 16, the decoder 17 judges at a first stage 
SA1, in cooperation with the P-ROM 19, whether or not the shaped signal is 
related to one of the primary and the secondary directory number signals. 
That is, the decoder 17 judges with reference to the memorized content of 
the P-ROM 19 whether or not either one of the primary and the secondary 
call signals is received as a received signal. When the shaped signal is 
coincident with either one of the primary and the secondary directory 
number signals, the first stage SA1 proceeds to a second stage SA2. 
Otherwise, the first stage SA1 is repeatedly carried out. 
At the second stage SA2, the decoder 17 carries out judgement whether or 
not the shaped signal is coincident with the primary directory number 
signal. In this manner, the decoder 17 serves as a judging arrangement. 
When the shaped signal is not coincident with the primary directory number 
signal, the second stage SA2 is followed by a third stage SA3. 
At the third stage SA3, the decoder 17 processes the shaped signal into the 
call tone signal. Responsive to the call tone signal, the driver circuit 
22 drives the loudspeaker 21. As a result, the loudspeaker 21 generates 
the audible tone in the manner known in the art. 
The third stage SA3 is succeeded by a fourth stage SA4 at which the decoder 
17 makes the first timer 171 start operation of the first timer 171 when 
the shaped signal is processed into the call tone signal. The first timer 
171 produces a first time-out signal when the first predetermined time 
duration lapses after start of operation of the first timer 171. The first 
predetermined time duration may be twenty through thirty seconds long. The 
fourth stage SA4 proceeds to a fifth stage SA5. 
At the fifth stage SA5, the decoder 17 carries out judgement whether or not 
the reset switch 23 is closed. When the reset switch 23 is not closed, the 
fifth stage SA5 proceeds to a sixth stage SA6 which will presently be 
described. When the reset switch 23 is closed to produce the tone stop 
instruction signal, the fifth stage SA5 is succeeded by a seventh stage 
SA7 at which the decoder 17 makes the loudspeaker 21 stop generation of 
the audible tone. Therefore, the decoder 17 may be referred to herein as a 
controlling arrangement. 
At the sixth stage SA6, the decoder 17 carries out judgement whether or not 
the first time-out signal is produced. When the judgement indicates a 
negative result, operation returns to the fifth stage SA5. When the 
judgement indicates an affirmative result, the sixth stage SA6 proceeds to 
the seventh stage SA7 at which the decoder 17 makes the loudspeaker 21 
stop generation of the audible tone. 
Description will return to the second stage SA2. When the shaped signal is 
coincident with the primary directory number signal, the decoder 17 
produces a particular signal. When the particular signal is produced in 
the decoder 17, the second stage SA2 is succeeded by an eighth stage SA8. 
At the eighth stage SA8, the decoder 17 processes the shaped signal into 
the call tone signal. Responsive to the call tone signal, the driver 
circuit 22 drives the loudspeaker 21 like the above-described case where 
the shaped signal is coincident with the secondary directory number 
signal. As a result, the loudspeaker 21 generates the audible tone. 
The eighth stage SA8 proceeds to a ninth stage SA9. At the ninth stage SA9, 
the decoder 17 carries out judgement whether or not the reset switch 23 is 
closed. When the reset switch 23 is closed, the ninth stage SA9 proceeds 
to a tenth stage SA10 which will presently be described. Otherwise, the 
ninth stage SA9 is repeatedly carried out. 
At the tenth stage SA10, the decoder 17 carries out judgement whether or 
not the reset switch 23 is continuously closed while the second 
predetermined time duration lapses after the reset switch 23 is closed. In 
this event, the decoder 17 serves as a judgement carrying out arrangement. 
The second predetermined time duration is determined by the second timer 
172 and may be two or three seconds long. Therefore, the second timer 17 
is referred to as a time determining arrangement. When the reset switch 23 
is opened before lapse of the second predetermined time duration, 
operation returns to the ninth stage SA9. Namely, the audible tone is not 
stopped in spite of closing of the reset switch 23. In this event, the 
decoder 17 restricts stop of the audible tone regardless of the tone stop 
instruction signal produced after the particular signal. In this manner, 
the decoder 17 serves as a restricting arrangement which restricts the 
stop of the audible tone unless the tone stop instruction signal is 
continuously produced during the second predetermined time duration after 
production of the particular signal. 
When the reset switch 23 is continuously closed during the second 
predetermined time, the decoder 17 produces a second time-out signal and 
may therefore be referred to herein as a judgement carrying out 
arrangement. When the second time-out signal is produced, the tenth stage 
SA10 proceeds to the seventh stage SA7 at which the decoder 17 makes the 
loudspeaker 21 stop generation of the audible tone. In this event, the 
decoder 17 serves as a releasing arrangement. 
With the radio paging receiver, the possessor can surely recognize 
reception of the primary call signal because the audible tone is not 
stopped in spite of closing of the reset switch 23. 
Referring to FIG. 3 together with FIG. 1, description will be made in 
connection with a radio paging receiver according to a second embodiment 
of this invention. When the decoder 17 is supplied with the shaped signal 
from the waveform shaper 16, the decoder 17 judges at a first stage SB1, 
in cooperation with the P-ROM 19, whether or not the shaped signal is 
related to one of the primary and the secondary directory number signals. 
That is, the decoder 17 judges with reference to the memorized content of 
the P-ROM 19 whether or not either one of the primary and the secondary 
call signals is received as the received signal. When the shaped signal is 
coincident with one of the primary and the secondary directory number 
signals, the first stage SB1 proceeds to a second stage SB2. Otherwise, 
the first stage SB1 is repeatedly carried out. 
At the second stage SB2, the decoder 17 carries out judgement whether or 
not the shaped signal is coincident with the primary directory number 
signal. Herein, the decoder 17 serves as the judging arrangement. When the 
shaped signal is not coincident with the primary directory number signal, 
the second stage SB2 is followed by a third stage SB3. 
At the third stage SB3, the decoder 17 processes the shaped signal into the 
call tone signal. Responsive to the call tone signal, the driver circuit 
22 drives the loudspeaker 21. As a result, the loudspeaker 21 generates 
the audible tone in the manner known in the art. 
The third stage SB3 is succeeded by a fourth stage SB4 at which the decoder 
17 makes the first timer 171 start its operation when the shaped signal is 
processed into the call tone signal. The first timer 171 produces a first 
time-out signal when the first predetermined time duration lapses after 
start of operation of the first timer 171. The first predetermined time 
duration may be twenty through thirty seconds long. The fourth stage SB4 
proceeds to a fifth stage SB5. 
At the fifth stage SB5, the decoder 17 carries out judgement whether or not 
the reset switch 23 is closed. When the reset switch 23 is not closed, the 
fifth stage SB5 proceeds to a sixth stage SB6 which will presently be 
described. When the reset switch 23 is closed to produce the tone stop 
instruction signal, the fifth stage SB5 is succeeded by a seventh stage 
SB7 at which the decoder 17 makes the loudspeaker 21 stop generation of 
the audible tone. Therefore, the decoder 17 may be referred to herein as 
the controlling arrangement. 
At the sixth stage SB6, the decoder 17 carries out judgement whether or not 
the first time-out signal is produced. When the judgement indicates a 
negative result, operation returns to the fifth stage SB5. When the 
judgement indicates an affirmative result, the sixth stage SB6 proceeds to 
the seventh stage SB7 at which the decoder 17 makes the loudspeaker 21 
stop generation of the audible tone. 
Description will return to the second stage SB2. When the shaped signal is 
coincident with the primary directory number signal, the decoder 17 
produces a particular signal. When the particular signal is produced in 
the decoder 17, the second stage SB2 is succeeded by an eighth stage SB8. 
At the eighth stage SB8, the decoder 17 processes the shaped signal into 
the call tone signal. Responsive to the call tone signal, the driver 
circuit 22 drives the loudspeaker 21 like the above-described case where 
the shaped signal is coincident with the secondary directory number 
signal. As a result, the loudspeaker 21 generates the audible tone. 
The eighth stage SB8 proceeds to a ninth stage SB9. A predetermined count 
number is determined in the decoder 17 and is equal to two in this 
embodiment. Therefore, the decoder 17 is referred to as a count number 
determining arrangement. At the ninth stage SB9, the decoder 17 carries 
out judgement whether or not the reset switch 23 is closed. When the reset 
switch 23 is closed, the ninth stage SB9 proceeds to a tenth stage SB10 
which will presently be described. Otherwise, the ninth stage SB9 is 
repeatedly carried out. 
At the tenth stage SB10, the decoder 17 carries out judgement whether or 
not the reset switch 23 is closed again. In other words, the decoder 17 
carries out judgement whether or not the counted result signal is 
representative of the predetermined count number, namely, two. In this 
manner, the decoder 17 counts up a count of representative of how many 
times the tone stop instruction signal is produced, and produces a counted 
result signal representative of the count. Herein, the decoder 17 is 
referred to as a counting arrangement. 
When the reset switch 23 is not closed, the tenth stage SB10 is repeatedly 
carried out. Namely, the audible tone is not stopped in spite of closing 
of the reset switch 23. 
In this manner, the decoder 17 serves as a restricting arrangement which 
restricts the stop of the audible tone unless the tone stop instruction 
signal is repeatedly produced after production of the particular signal. 
When the counted result signal is representative of the predetermined count 
number with the reset switch 23 being closed again, the decoder 17 
produces a count number signal. Herein, the decoder 17 is referred to as 
the judgement carrying out arrangement. 
The tenth stage SB10 proceeds to the seventh stage SB7 at which decoder 17 
makes the loudspeaker 21 stop generation of the audible tone. Herein, the 
decoder 17 serves as the releasing arrangement. 
With the radio paging receiver, the possessor can surely recognize 
reception of the primary call signal because the audible tone is not 
stopped unless the reset switch 23 is closed twice. 
Referring to FIG. 4 together with FIG. 1, description will be made as 
regards a first modification of the radio paging receiver according to the 
second embodiment of this invention. For convenience, the description is 
omitted about the first through tenth stages SB1 through SB10 which are 
similar to the stages designated by like reference numerals. 
When the reset switch 23 is closed, the ninth stage SB9 proceeds to an 
eleventh stage SB11 at which the decoder 17 makes the loudspeaker 21 
increase the volume of the audible tone. The eleventh stage SB11 is 
succeeded by the tenth stage SB10 at which the decoder 17 carries out 
judgement whether or not the reset switch 23 is closed again. 
Referring to FIG. 5 together with FIG. 1, description will be made in 
connection with a second modification of the radio paging receiver 
according to the second embodiment of this invention. When the decoder 17 
is supplied with the shaped signal from the waveform shaper 16, the 
decoder 17 judges at a first stage SC1, in cooperation with the P-ROM 19, 
whether or not the shaped signal is related to one of the primary and the 
secondary directory number signals. That is, the decoder 17 judges with 
reference to the memorized content of the P-ROM 19 whether or not either 
one of the primary and the secondary call signals is received as the 
received signal. When the shaped signal is coincident with either one of 
the primary and the secondary directory number signals, the first stage 
SC1 proceeds to a second stage SC2. Otherwise, the first stage SC1 is 
repeatedly carried out. 
At the second stage SC2, the decoder 17 processes the shaped signal into 
the call tone signal. Responsive to the call tone signal, the driver 
circuit 22 drives the loudspeaker 21. As a result, the loudspeaker 21 
generates the audible tone in the manner known in the art. 
The second stage SC2 proceeds to a third stage SC3. A predetermined count 
number is determined in the decoder 17 and is equal to two in this 
embodiment. Therefore, the decoder 17 is referred to as the count number 
determining arrangement. At the third stage SC3, the decoder 17 carries 
out judgement whether or not the reset switch 23 is closed. When the reset 
switch 23 is closed, the third stage SC3 proceeds to a fourth stage SC4 
which will presently be described. Otherwise, the third stage SC3 is 
repeatedly carried out. 
At the fourth stage SB4, the decoder 17 carries out judgement whether or 
not the shaped signal is coincident with the primary directory number 
signal. Herein, the decoder 17 serves as the judging arrangement. When the 
shaped signal is not coincident with the primary directory number signal, 
the fourth stage SC4 is followed by a fifth stage SC5 at which the decoder 
17 makes the loudspeaker 21 decreases the volume of the audible tone. 
The fifth stage SC5 is succeeded by a sixth stage SC6 at which the decoder 
17 makes the first timer 171 start its operation when the shaped signal is 
processed into the call tone signal. The first timer 171 produces a first 
time-out signal when the first predetermined time duration lapses after 
start of operation of the first timer 171. The first predetermined time 
duration may be twenty through thirty seconds long. The sixth stage SC6 
proceeds to a seventh stage SC7. 
At the seventh stage SC7, the decoder 17 carries out judgement whether or 
not the reset switch 23 is closed. When the reset switch 23 is not closed, 
the seventh stage SC7 proceeds to an eighth stage SC8 which will presently 
be described. When the reset switch 23 is closed to produce the tone stop 
instruction signal, the seventh stage SC7 is succeeded by a ninth stage 
SC9 at which the decoder 17 makes the loudspeaker 21 stop generation of 
the audible tone. Therefore, the decoder 17 may be referred to herein as 
the controlling arrangement. 
At the eight stage SC8, the decoder 17 carries out judgement whether or not 
the first time-out signal is produced. When the judgement indicates a 
negative result, operation returns to the seventh stage SC7. When the 
judgement indicates an affirmative result, the eighth stage SC8 proceeds 
to the ninth stage SC9 at which the decoder 17 makes the loudspeaker 21 
stop generation of the audible tone. 
Description will return to the fourth stage SC4. When the shaped signal is 
coincident with the primary directory number signal, the decoder 17 
produces a particular signal. When the particular signal is produced in 
the decoder 17, the fourth stage SC4 is succeeded by a tenth stage SC10. 
At the tenth stage SC10, the decoder 17 carries out judgement whether or 
not the reset switch 23 is closed again. In other words, the decoder 17 
carries out judgement whether or not the counted result signal is 
representative of the predetermined count number, namely, two. In this 
manner, the decoder 17 counts up a count representative of how many times 
the tone stop instruction signal is produced, and produces the counted 
result signal representative of the count. Herein, the decoder 17 is 
referred to as the counting arrangement. 
When the reset switch 23 is not closed, the tenth stage SC10 is repeatedly 
carried out. Namely, the audible tone is not stopped unless the reset 
switch 23 is closed again. 
In this manner, the decoder 17 serves as a restricting arrangement which 
restricts the stop of the audible tone unless the tone stop instruction 
signal is repeatedly produced after production of the particular signal. 
When the counted result signal is representative of the predetermined count 
number with the reset switch 23 being closed again, the decoder 17 
produces the count number signal. Herein, the decoder 17 is referred to as 
the judgement carrying out arrangement. 
The tenth stage SC10 proceeds to the ninth stage SC9 at which the decoder 
17 makes the loudspeaker 21 stop generation of the audible tone. 
Referring to FIG. 6, description will proceed to a radio paging receiver 31 
according to a third embodiment of this invention. The radio paging 
receiver 31 comprises similar parts designated by like reference numerals. 
The radio paging receiver 31 is capable of carrying out various operations 
in response to each of the primary and the secondary call signals. Each of 
the primary and the secondary call signals comprises a call number signal 
and a message signal following the call number signal. The call number 
signal represents the primary or the secondary call numbers assigned to 
the radio paging receiver 31 to which the message signal should be 
directed. 
In order to enable visual display of messages carried by the message 
signal, the radio paging receiver 31 further comprises a display unit 32 
connected to the decoder 17. Responsive to the message signal, the display 
unit 32 provides visual display of the messages as will later become 
clear. 
The decoder 17 further comprises a third timer 173 coupled to the quarts 
crystal oscillator for determining a third predetermined time duration 
which will later become clear. The third timer is referred to as an 
internal time determining arrangement. 
Referring to FIG. 7 together with FIG. 6, operation of the decoder 17 will 
be described in detail. When the decoder 17 is supplied with the shaped 
signal from the waveform shaper 16, the decoder 17 judges at a first stage 
SD1, in cooperation with the P-ROM 19, whether or not the shaped signal is 
related to one of the primary and the secondary directory number signals. 
That is, the decoder 17 judges with reference to the memorized content of 
the P-ROM 19 whether or not either one of the primary and the secondary 
call signals is received as the received signal. When the shaped signal is 
coincident with one of the primary and the secondary directory number 
signals, the first stage SD1 proceeds to a second stage SD2. Otherwise, 
the first stage SD1 is repeatedly carried out. 
At the second stage SD2, the decoder 17 carries out judgement whether or 
not the shaped signal is coincident with the primary directory number 
signal. Herein, the decoder 17 serves as the judging arrangement. When the 
shaped signal is not coincident with the primary directory number signal, 
the stage SD2 is followed by a third stage SD3. 
At the third stage SD3, the decoder 17 processes the shaped signal into the 
call tone signal. Responsive to the call tone signal, the driver circuit 
22 drives the loudspeaker 21. As a result, the loudspeaker 21 generates 
the audible tone in the manner known in the art. 
The third stage SD3 is succeeded by a fourth stage SD4 at which the decoder 
17 carries out judgement whether or not the shaped signal comprises a 
message part produced dependent on the message signal. When the message 
part is not present in the shaped signal, the fourth stage SD4 is followed 
by a fifth stage SD5. 
When the shaped signal comprises a message part, the fourth stage SD4 
proceeds to a sixth stage SD6 at which the decoder 17 energizes the 
display unit 32 to provide the visual display of the message. The sixth 
stage SD6 is succeeded by the fifth stage SD5. 
At the fifth stage SD5, the decoder 17 makes the first timer 171 start 
operation of the first timer 171. The first timer 171 produces a first 
time-out signal when the first predetermined time duration lapses after 
operation of the first timer 171 is started. The first predetermined time 
duration may be twenty through thirty seconds long. The fifth stage SD5 
proceeds to a seventh stage SD7. 
At the seventh stage SD7, the decoder 17 carries out judgement whether or 
not the reset switch 23 is closed. When the reset switch 23 is not closed, 
the fifth stage SD5 proceeds to a sixth stage SD6 which will presently be 
described. When the reset switch 23 is closed to produce the tone stop 
instruction signal, the seventh stage SD7 is succeeded by an eighth stage 
SD8 at which the decoder 17 makes the loudspeaker 21 stop generation of 
the audible tone. Therefore, the decoder 17 may be referred to herein as 
the controlling arrangement. 
At the eighth stage SD8, the decoder 17 carries out judgement whether or 
not the first time-out signal is produced. When the judgement indicates a 
negative result, operation returns to the seventh stage SD7. When the 
judgement indicates an affirmative result, the seventh stage SD7 proceeds 
to the ninth stage SD9 at which the decoder 17 makes the loudspeaker 21 
stop generation of the audible tone. Simultaneously, the decoder 17 
deenergize the display unit 32 so that the visual display of the message 
disappears from the display unit 32. 
Description will return to the second stage SD2. When the shaped signal is 
coincident with the primary directory number signal, the decoder 17 
produces a particular signal. When the particular signal is produced in 
the decoder 17, the second stage SD2 is succeeded by a tenth stage SD10. 
At the tenth stage SD10, the decoder 17 processes the shaped signal into 
the call tone signal. Responsive to the call tone signal, the driver 
circuit 22 drives the loudspeaker 21 like the above-described case where 
the shaped signal is coincident with the secondary directory number 
signal. As a result, the loudspeaker 21 generates the audible tone. 
The tenth stage SD10 proceeds to an eleventh stage SD11. At the eleventh 
stage SD11, the decoder 17 makes the display unit 32 intermittently 
display a predetermined one of various messages which are depicted in 
FIGS. 8A, 8B, and 8C. Herein, the decoder 17 serves as an energizing 
arrangement. 
The eleventh stage SD11 proceeds to a twelfth stage SD12. A predetermined 
count number is determined in the decoder 17 and is equal to two in this 
embodiment. Therefore, the decoder 17 is referred to as the count number 
determining arrangement. At the twelfth stage SD12, the decoder 17 carries 
out judgement whether or not the reset switch 23 is closed. When the reset 
switch 23 is closed, the twelfth stage SD12 proceeds to a thirteenth stage 
SD13 which will presently be described. Otherwise, the twelfth stage SD12 
is repeatedly carried out. 
At the thirteenth stage SD13, the decoder 17 makes the loudspeaker 21 stop 
generation of the audible tone with the display unit 32 intermittently 
displaying the predetermined message. Herein, the decoder 17 serves as a 
temporal preventing arrangement. The thirteenth stage SD13 proceeds to a 
fourteenth stage SD14. 
At the fourteenth stage SD14, the decoder 17 carries out judgement whether 
or not the reset switch 23 is closed again. In other words, the decoder 17 
carries out judgement whether or not the counted result signal is 
representative of the predetermined count number, namely, two. In this 
manner, the decoder 17 counts up a count of representative of how many 
times the tone stop instruction signal is produced, and produces a counted 
result signal representative of the count. Herein, the decoder 17 is 
referred to as the counting arrangement. 
When the counted result signal is representative of the predetermined count 
number with the reset switch 23 being closed again, the decoder 17 
produces the count number signal. Herein, the decoder 17 is referred to as 
the judgement carrying out arrangement. 
When the reset switch 23 is closed, the fourteenth stage SD14 is followed 
by a fifteenth stage SD15 at which the decoder 17 deenergizes the display 
unit 32 so that the visual display of the messages disappears from the 
display unit 32. Herein, the decoder 17 serves as a deenergizing 
arrangement. Otherwise, the fourteenth stage SD14 is succeeded by the 
sixteenth stage SD16. 
At the sixteenth stage SD16, the decoder 17 makes the third timer 173 start 
operation of the third timer 173. The third timer 173 produces a third 
time-out signal when the third predetermined time duration lapses after 
start of operation of the third timer 173. The third predetermined time 
duration may be twenty through thirty seconds long. The sixteenth stage 
SD16 proceeds to a seventeenth stage SD17. 
At the seventeenth stage SD17, the decoder 17 carries out judgement whether 
or not the third time-out signal is produced. When the judgement indicates 
a negative result, operation returns to the fourteenth stage SD14. When 
the fourteenth, the sixteenth, and the seventeenth stages SD14, SD16, and 
SD17 are carried out, the decoder 17 serves as a temporal preventing 
arrangement for temporally preventing the restricting arrangement from 
restricting the stop of the audible tone during the third time duration. 
When the judgement indicates an affirmative result, the seventeenth stage 
SD17 proceeds to the tenth stage SD10 at which the decoder 17 makes the 
loudspeaker 21 generate the audible tone again. 
In this manner, the decoder 17 serves as a restricting arrangement which 
restricts the stop of the audible tone unless the tone stop instruction 
signal is twice produced after production of the particular signal 
although the audible tone is produced again after the audible tone is 
stopped when the tone stop instruction signal is once produced. 
With the radio paging receiver, the possessor can surely recognize 
reception of the primary call signal because the audible tone is not 
stopped unless the reset switch 23 is closed twice. 
Before each of the stages SB9, SC3, and SD12 is carried out, a specific 
count number is predetermined in the decoder 17. The specific count number 
is less than the predetermined count number and is equal to one in this 
embodiment. In this event, the decoder 17 serves as a specific number 
determining arrangement. 
When each of the stages SB9, SC3, and SD12 is carried out, the decoder 17 
serves as a specific carrying out arrangement for carrying out judgement 
whether or not the counted result signal is representative of the specific 
count number. When the counted result signal is representative of said 
specific count number, the specific carrying out arrangement produces a 
specific count number signal. 
When each of the stages SB11, SC5, and SD13 is carried out, the decoder 17 
serves as an internal controlling arrangement for controlling the 
operation of the generating arrangement so that the audible tone is 
modified in response to the specific count number signal. 
While the present invention has thus far been described in connection with 
only a few embodiment thereof, it will readily be possible for those 
skilled in the art to put this invention into practice in various other 
manners. For example, different audible tones may be produced in response 
to receptions of the primary and the secondary call signals, respectively. 
Although the description has been made as regards the radio paging 
receiver in which one of the call signals is used for carrying out a 
normal call of the possessor, the radio paging receiver may be supplied 
with two or more call signals for carrying out the normal call.