Communications: electrical – Selective – Having indication or alarm
Reexamination Certificate
1999-03-17
2002-02-19
Bost, Dwayne (Department: 2681)
Communications: electrical
Selective
Having indication or alarm
C340S007280
Reexamination Certificate
active
06348854
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a radio selective-calling receiver which in particular avoids troubles generated at the time when a received calling is informed to a user.
DESCRIPTION OF THE RELATED ART
Generally, at a radio selective-calling receiver, in order to extend the battery life, a radio section of the radio selective-calling receiver is intermittently operated and is turned on at the time when a signal having its own ID number is received, and the radio selecting-calling receiver takes in the data. However, a control section of the radio selective-calling receiver is always operated in order to take timing.
At the time when its own ID number is detected from the received data, a received calling is informed to the user by a sound from a speaker or the flashing of LED or the vibration of a vibrator and so forth. The information of the vibration of the vibrator is generated by making a decentering weight fixed at a motor rotate in general and the received calling is informed. This method is effective at the place where such as the inside of a factory having big noise or at the time during a meeting or some public facilities where the received sound makes the public bother.
FIG. 1
is a block diagram showing the construction of the conventional radio selective-calling receiver. This radio selective-calling receiver is constituted of a radio section
801
which amplifies and demodulates signals received at an antenna
807
, a controller
802
which outputs control signals that makes this radio section
801
intermittently operate, and makes a vibrator
803
operate by switching on a switch
804
at the time received a calling for a user, a power supply
805
which supplies power to the radio section
801
, the controller
802
and the vibrator
803
through the switch
804
, and an operating section
806
at which a user implements various kinds of operation.
FIG. 2
is a diagram showing main control signals outputting from the controller
802
. As shown in
FIG. 2
, the controller
802
controls the intermittent operation of the radio section
801
with a radio section control signal and controls the vibrator
803
with a receiving information signal. This receiving information signal is outputted at the time when its own ID number is detected in the received data.
FIG. 3
is a timing chart showing the operation of this radio selective-calling receiver. FIG.
3
(
a
) shows the POCSAG (post office code standardization advisory group) signal format being an example of the signal format of the radio selective-calling receiver. This POCSAG signal format is constituted of a preamble and plural batches and the batch is composed of a synchronization signal SC and eight frames.
FIG.
3
(
b
) shows the operation timing (a radio section control signal) of the radio section
801
. First, the preamble being the repetition of “1” and“0” is detected and after detecting the preamble, the detecting operation of the synchronization signal SC is implemented. After finishing the detection of the synchronization signal SC, the controller
802
decides at which frame of eight frames to make the radio section
801
turn on by its own ID number. In this case, the radio section
801
becomes turning on at the third frame. At and after the second batch, the synchronization signal SC is not received and at the third frame the radio section
801
becomes turning on.
FIG.
3
(
c
) shows a receiving information signal at the case that its own ID number is detected at the third frame of the first batch. With this receiving information signal, the switch
804
becomes switching on and the vibrator
803
and the power supply are connected and the vibrator
803
is driven. FIG.
3
(
d
) shows the operation timing of the vibrator
803
at this time.
As it is clear from FIG.
3
(
b
) and FIG.
3
(
d
), there is no relationship between the operation of the radio section
801
and the operation of the vibrator
803
, even at the time during the radio section
801
is on state, the vibrator
803
is operating. Therefore, there is a problem that the noise generated by the operation of the vibrator
803
is transmitted to the radio section
801
through the power supply line and this causes a bad effect such as the deterioration of the sensitivity of the radio section
801
. Furthermore, a big current flows in the vibrator
803
and a voltage drop occurs at the power supply
805
, therefore there is another problem that the operating characteristic of the radio section
801
becomes unstable.
In order to solve the problem of the deterioration of the characteristic of the radio section caused by the operating noise of the vibrator, for example the Japanese Patent Application Laid-Open No. HEI 3-226029 discloses the following apparatus.
FIG. 4
is a block diagram showing the construction of this radio selective-calling receiver of the conventional type. This radio selective-calling receiver provides another power supply for the vibrator. However, the main control signals and the timing chart are completely the same as ones stated in the
FIGS. 2 and 3
.
As shown in
FIG. 4
, the voltage of a power supply
1150
is boosted by a DC/DC converter
1190
and a secondary battery
1100
is charged through a diode
1180
and this secondary battery
1100
is used for a power supply of a vibrator
1130
. According to this, the power supply of a radio section
1110
and the power supply of the vibrator
1130
are separated, as a result, the operation noise of the vibrator
1130
does not influence the radio section
1110
completely.
To solve the unstable operation of the radio section caused by the voltage drop of the power supply at the time when the vibrator is operating, for example the Japanese Patent Application Laid-Open No. HEI 7-87540 discloses a following apparatus.
FIG. 5
is a block diagram showing the construction of this radio selective-calling receiver. In this, a vibrator
1290
is controlled by a rectangular wave.
However, even in the radio selective-calling receiver disclosed by the Japanese Patents Application Laid-Open No. HEI 3-226029 and HEI 7-87540, there are following problems.
In the radio selective-calling receiver disclosed by the Japanese Patent Application Laid-Open No. HEI 3-226029, as shown in
FIG. 4
, at the time when the vibrator
1130
is operated, the current over the operating current of the vibrator
1130
flows in the DC/DC converter
1190
for boosting voltage, therefore the voltage drop of the power supply
1150
becomes big and the operation of the radio section
1110
becomes further unstable. And the secondary battery
1100
, the diode
1180
and the DC/DC converter
1190
must be added, with this, the cost increases and the big sized apparatus is not avoided.
In the radio selective-calling receiver disclosed by the Japanese Patent Application Laid-Open No. HEI 7-87540, as shown in
FIG. 5
, the operation of the radio section
1220
and of the vibrator
1290
have no relationship, even at the time when the radio section is on state, the vibrator
1290
operates, therefore the operation noise of the vibrator
1290
is transmitted to the radio section
1220
through the power supply line and the bad effect such as the deterioration of the sensitivity influencing to the radio section
1220
is not improved. By controlling with a rectangular wave, on the contrary the operating noise of the vibrator
1290
is increased and there is a possibility that the influence giving to the radio section
1220
becomes big.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a radio selective-calling receiver which avoids the influence of noise and the deterioration of the characteristic of the radio section generated at the time of informing a calling to a user, and avoids the increase of cost and the large size.
According to a first aspect of the present invention, for achieving the above mentioned objects, a radio selective-calling receiver provides a signal receiving means for receiving transmitted signals, a informing means for
Bost Dwayne
NEC Corporation
West Lewis
LandOfFree
Radio selective-calling receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio selective-calling receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio selective-calling receiver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2941521