Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2000-03-28
2001-09-04
Dolinar, Andrew M. (Department: 3747)
Telecommunications
Radiotelephone system
Special service
Reexamination Certificate
active
06285872
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a digital radio telephone used in a digital mobile radio communication system such as a land mobile/portable phone system and a PHS (Personal Handyphone System) adopting a digital telephone system for example. The invention particularly relates to a digital radio telephone having a function of storing a mate telephone number (hereinafter, referred to as “incoming telephone number”) and a function of calling the stored phone number (hereinafter, referred to as “incoming redialing function”).
2. Description of the Prior Art
FIG. 11
shows a system configuration of an analog radio telephone having a conventional incoming redialing function disclosed in a laid-open Japanese patent publication No. 5-14274. This type of conventional telephone receives mate telephone number information of an incoming call together with an analog audio signal via a radio channel using a communication channel in a form of a DTMF (Dual Tone Multi Frequency) signal where a plurality of frequency signals are superposed, and then, stores the telephone number information in a memory.
An operation of the incoming redialing function of the analog radio telephone is explained below. First, a radio signal containing control information received via an antenna
6
using a control channel is demodulated by a radio portion
5
and outputted as a control signal which is an analog signal in a base band. Control information in the demodulated control signal is decoded by a decoder
15
and is processed by a microcomputer
10
to establish the radio communication channel. Then, a radio signal containing the telephone number information received via the antenna
6
using the communication channel is demodulated by the radio portion
5
and outputted as the DTMF signal which is the analog signal in 9 base band. The telephone number information in the demodulated DTMF signal is detected, judged, and decoded by a DTMF receiver
16
. Then, the output receiver
16
from the DTMF signal is processed by the microcomputer
10
and stored in a memory
12
. On the other hand, in case of calling by redialing, the telephone number information stored in advance in the memory
12
by the microcomputer
10
is read out, encoded by an encoder
17
, modulated by the radio portion
5
, then, transmitted from the antenna
6
as a radio signal.
Since the incoming redialing function in the conventional analog radio telephone constructed as explained above requires the DTMF receiver for detecting the telephone number information in addition to the construction for operating the telephone function itself, there is a problem that the conventional analog radio telephone construction is complicated. Also, since the conventional analog radio telephone redials using the telephone number information stored only in the memory, it is difficult to provide an incoming redialing function having high-performance or multifunction in consideration of user service.
It is an object of the present invention to provide a digital radio telephone having a high-performance incoming redialing function by maximally using the digital processing ability naturally included in a digital radio telephone.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a digital radio telephone comprises a radio portion for receiving a radio signal modulated by an encoded digital signal including control information, for demodulating and outputting the encoded digital signal; a control signal processing portion for decoding the demodulated encoded digital signal to obtain the control information; a telephone number information detecting means for detecting whether the decoded control information includes mate telephone number information; a memory for storing the telephone number information; a time information management means for specifying an incoming time of the telephone number information to output a time information; and a memory management means for recording the telephone number information corresponding to the time information into the memory.
According to another aspect of the invention, a digital radio telephone used for an external line and an extension line further comprises an extension/external line judging means for judging whether the telephone number information is from the extension or from the external line; an external line information addition means for adding an external line calling information to the telephone number information according to a judging result to output as new telephone number information.
Preferably, the memory management means in the digital radio telephone records a predetermined number of telephone number information in the memory starting with telephone number information received most recently.
According to further aspect of the invention, a digital radio telephone further comprises an operating portion for supplying an operating signal, and a display portion for displaying various information during operation, wherein, the memory comprises a first memory portion for storing the telephone number information included in the control information and a second memory portion for registering other telephone numbers information inputted from the operating portion corresponding identification information to the telephone numbers; and the operating portion instructs the display portion to display the telephone number information recorded in the first memory portion together with the corresponding identification information recorded in the second memory portion.
According to further aspect of the invention, a digital radio telephone further comprises an operating portion for supplying an operating signal, a display portion for displaying various information during operation, wherein, the memory comprises a first memory portion for storing the telephone number information included in the control information and a second memory portion for registering other telephone numbers information inputted from the operating portion corresponding identification information to the telephone numbers; and the operating portion instructs the display portion to display the telephone number information recorded in the first memory portion together with the corresponding identification information recorded in the second memory portion.
According to further aspect of the invention, a digital radio telephone further comprises an operating portion for supplying an operating signal, a display portion for displaying various information during operation, wherein, the operating portion instructs the display portion to display the telephone number information one after another in a circulative way starting with telephone number information received most recently.
Preferably, the operating portion in the digital radio telephone instructs to make a calling process according to the telephone number information when predetermined telephone number information recorded in the memory is displayed on the display portion.
Preferably, the memory in the digital radio telephone comprises a first memory portion for storing the telephone number information included in the control information and a second memory portion for registering other telephone numbers information inputted from the operating portion corresponding identification information to the telephone numbers; and the operating portion instructs the second memory portion to register the predetermined telephone number information when the predetermined telephone number information recorded in the first memory portion is displayed on the display portion.
REFERENCES:
patent: 5251250 (1993-10-01), Obata et al.
patent: 5363429 (1994-11-01), Fujisawa
patent: 5398279 (1995-03-01), Frain
patent: 5559860 (1996-09-01), Mizikovsky
Dolinar Andrew M.
Mitsubishi Denki & Kabushiki Kaisha
Rothwell Figg Ernst & Manbeck
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