Reexamination Certificate
1998-09-14
2001-04-17
Urban, Edward F. (Department: 2683)
C455S039000, C455S458000, C340S870030
Reexamination Certificate
active
06216385
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a radio calling receiver for calling and displaying messages or information corresponding to data contained in a radio signal which is transmitted from a base station of a radio calling system.
FIG. 13
is a block circuit diagram showing a circuit configuration of a radio calling receiver in the prior art. In
FIG. 13
, a reference
21
denotes a receiver portion for receiving a radio signal transmitted from a base station of a radio calling system through an antenna
21
a
and then demodulating the radio signal into a digital signal;
22
, a decoder for executing a bit synchronization and error correction process of the received signal being converted into the digital signal and then collating an address contained in the received signal with an own address stored in a memory
23
;
23
, a memory having a memory device, e.g., an EEPROM (Electrically Erasable Programmable Read Only Memory) into which data can be electrically erased and written, and for storing the own address of the radio calling receiver; and
24
, a CPU (Central Processing Unit) for controlling peripheral circuits based on the received signal transmitted from the decoder
22
. A reference
25
denotes a display driver for driving a display
26
based on a display signal supplied from the CPU
24
;
26
, a display for displaying the messages in response to the display signal by using a liquid crystal display device when it is driven by the display driver
25
; and
27
, a switch for generating commands and various data corresponding to an operation instructed by a user. A signal output from the switch
27
is input into the CPU
24
via the decoder
22
. A reference
28
denotes a speaker driver for generating a ringer tone by sounding a ringing speaker
29
, and a reference
30
denotes a vibrator driver for controlling vibrations of a vibrator
31
.
Next, an operation of the above radio calling receiver will be explained hereunder. The receiver portion
21
first receives the radio signal transmitted from the base station of the radio calling system (referred to simply as the “base station” hereinafter) via the antenna
21
a
at a predetermined timing controlled by the CPU
24
, then converts this received radio signal into the digital signal via amplification, frequency-conversion, detection, and demodulation processes, and then sends out the digital signal to the decoder
22
. Then, the decoder
22
executes the bit synchronization and error correction process of the digital signal received from the receiver portion
21
, then collates the address contained in the received signal with the own address read out from the memory
23
via the CPU
24
, and then decides whether or not the received signal is directed to own radio calling receiver.
If the received signal is directed to the own radio calling receiver and message data are contained in the received signal, the decoder
22
fetches the message data from the received signal, then sends out the message data to the CPU
24
, and then outputs a drive signal to the speaker driver
28
or the vibrator driver
30
. The speaker driver
28
generates the ringer tone by driving the ringing speaker
29
in answer to inputting of the drive signal. Otherwise, if the radio calling receiver is set into a calling operation for the vibrator
31
in advance, it can output the drive signal only to the vibrator driver
30
to cause the vibrator
31
to vibrate. In parallel to this calling operation, the CPU
24
converts the message data into a display signal, which is composed of an assembly of predetermined bit number of bit codes, and then sends out the display signal to the display driver
25
. Then, the display driver
25
displays predetermined messages corresponding to the message data on the display
26
by driving the display
26
based on the display signal sent out from the CPU
24
.
In this manner, the conventional radio calling receiver can receive the radio signal transmitted from the base station, then execute the ringing operation by using the ringer tone and then display the messages contained in the radio signal by use of characters.
However, in the above-mentioned conventional radio calling receiver, in the event that normal individual calling messages and information broadcasting messages which can broadcast information such as news, weather forecast, for example, are to be received by using separate receiving frames, a receiving operation for individual calling and a receiving operation for information broadcasting must be repeated at constant cycles respectively. For this reason, the radio calling receiver in the prior art has had such a problem that, the number of the receiving operation per a constant time is increased rather than the case where only the receiving frame for individual calling is to be received, so that the radio calling receiver must repeat receiving operations which are disadvantageous for battery lifetime.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above problems, and it is an object of the present invention to provide a radio calling receiver which is capable of achieving power saving or conservation by controlling its receiving operation when messages are just received by using a plurality of own frames such as individual calling frame, information broadcasting frame.
In order to achieve the above object, in the radio calling receiver which is able to receive radio signals transmitted to a plurality of own addresses as a plurality of different own frames respectively, according to whether or not a receiving state is in or out of a service area of a base station, or according to an error rate of received radio information, or according to whether or not a current time belongs to a time zone which is arbitrarily set to particular information broadcasting addresses by a user, the present invention can reduce the number of received frames to achieve power saving or conservation respectively. In addition, in case of the receiving state is out of a service area of the base station, a standby operation is executed when the electric field strength exceeds a predetermined value, so that the radio calling receiver of the present invention can also achieve the power saving or conservation.
A radio calling receiver according to the present invention comprises: a receiving means for receiving radio signals transmitted to a plurality of own addresses from a base station of a radio calling system as a plurality of different own frames respectively; a decoding means for fetching one or a plurality of own addresses from the radio signals received and then fetching message data corresponding to the own addresses; a receiving frame controlling means for controlling individually receiving operations of a plurality of frames; and a receiving state detecting means for detecting whether or not a receiving state is in or out of a service area of the base station; wherein receiving operations in all own frames corresponding to the plurality of own addresses can be executed if the receiving state is in the service area, and receiving operations only in own frames corresponding to individual calling addresses can be executed if the receiving state is out of the service area, whereby reception of own frames such as information broadcasting frames which need a low real-time response can be halted. As a result, the above invention has such an advantage that, if messages are to be received as a plurality of frames for individual calling, information broadcasting, etc., the power saving or conservation can be achieved by reducing the number of receiving frames when the receiving state is out of the service area of the base station.
Further, a radio calling receiver according to the present invention comprises: a receiving means for receiving radio signals transmitted to a plurality of own addresses from a base station of a radio calling system as a plurality of different own frames respectively; a decoding means for fetching one or a plurality of own addresses fro
Gesesse Tilahun
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
Urban Edward F.
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