Cellular telephone operable on different cellular telephone systems
First Claim
1. A cellular telephone communicating cellular telephone calls on at least first and second cellular telephone systems each having different cellular radio channels, said cellular telephone comprising:
- antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels;
dialing means for dialing digits of telephone numbers;
cellular transmitting means coupled to the antenna means for transmitting cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems;
cellular receiving means coupled to the antenna means for receiving cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems, said cellular receiving means further including intermediate frequency means having first filtering means having a first predetermined bandwidth, second filtering means having a second predetermined bandwidth that has a magnitude less than that of the first predetermined bandwidth, and switching means responsive to a bandwidth control signal having first and second states for switching between the first and second filtering means, respectively; and
control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first cellular telephone system using the first control program and on the second cellular telephone system using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first cellular telephone system and generating the second state of the bandwidth control signal for cellular telephone calls on said second cellular telephone system, and said control means monitoring the cellular radio channels to detect the absence of cellular service and switching between the first and second cellular telephone systems when cellular service has been absent for a predetermined time interval.
0 Assignments
0 Petitions
Accused Products
Abstract
A unique dual-system cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different filters (408 and 410) in the intermediate frequency section thereof which are switchably selected depending on which cellular telephone system is available. When service is not available in one of the cellular telephone systems, the unique cellular telephone automatically switches the receiver bandwidth and control program for operating on the other cellular telephone system.
203 Citations
24 Claims
-
1. A cellular telephone communicating cellular telephone calls on at least first and second cellular telephone systems each having different cellular radio channels, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; dialing means for dialing digits of telephone numbers; cellular transmitting means coupled to the antenna means for transmitting cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems; cellular receiving means coupled to the antenna means for receiving cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems, said cellular receiving means further including intermediate frequency means having first filtering means having a first predetermined bandwidth, second filtering means having a second predetermined bandwidth that has a magnitude less than that of the first predetermined bandwidth, and switching means responsive to a bandwidth control signal having first and second states for switching between the first and second filtering means, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first cellular telephone system using the first control program and on the second cellular telephone system using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first cellular telephone system and generating the second state of the bandwidth control signal for cellular telephone calls on said second cellular telephone system, and said control means monitoring the cellular radio channels to detect the absence of cellular service and switching between the first and second cellular telephone systems when cellular service has been absent for a predetermined time interval. - View Dependent Claims (2, 3, 4)
-
-
5. A cellular telephone communicating cellular telephone calls on at least first and second cellular telephone systems each having different cellular radio channels, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; transmitter filtering means coupled to the antenna means for filtering the transmitted cellular telephone call signals; receiver filtering means coupled to the antenna means for filtering the received cellular telephone call signals; dialing means for dialing digits of telephone numbers; cellular transmitting means coupled to the transmitter filtering means for transmitting cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems; cellular receiving means coupled to the receiver filtering means for receiving cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems, said cellular receiving means further including intermediate frequency means having first filtering means having a first predetermined bandwidth, second filtering means having a second predetermined bandwidth that has a magnitude less than that of the first predetermined bandwidth, and switching means responsive to a bandwidth control signal having first and second states for switching between the first and second filtering means, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first cellular telephone system using the first control program and on the second cellular telephone system using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first cellular telephone system and generating the second state of the bandwidth control signal for cellular telephone calls on said second cellular telephone system, and said control means monitoring the cellular radio channels to detect the absence of cellular service and switching between the first and second cellular telephone systems when cellular service has been absent for a predetermined time interval. - View Dependent Claims (6, 7, 8)
-
-
9. A cellular telephone communicating cellular telephone calls on at least first and second cellular telephone systems each having different cellular radio channels, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; dialing means for dialing digits of telephone numbers; cellular transmitting means coupled to the antenna means for transmitting cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems; cellular receiving means coupled to the antenna means for receiving cellular telephone call signals on the cellular radio channels of the first and second cellular telephone systems, said cellular receiving means further including; first intermediate frequency means including first filtering means having a first predetermined bandwidth for generating a first intermediate frequency signal; second intermediate frequency means including second filtering means having a second predetermined bandwidth, third filtering means having a third predetermined bandwidth that has a magnitude less than that of the second predetermined bandwidth, said second intermediate frequency means coupled to the first intermediate frequency signal for generating a second intermediate frequency signal; detecting means coupled to the second intermediate frequency signal for detecting the received cellular telephone call signals; and switching means responsive to a bandwidth control signal having first and second states for switching between the second and third filtering means, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first cellular telephone system using the first control program and on the second cellular telephone system using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first cellular telephone system and generating the second state of the bandwidth control signal for cellular telephone calls on said second cellular telephone system, and said control means monitoring the cellular radio channels to detect the absence of cellular service and switching between the first and second cellular telephone systems when cellular service has been absent for a predetermined time interval. - View Dependent Claims (10, 11, 12)
-
-
13. A cellular telephone communicating cellular telephone calls on a first set of cellular radio channels having a first cellular telephone signalling protocol and a second set of cellular radio channels having a second cellular telephone signalling protocol, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; dialing means for dialing digits of telephone numbers; synthesizing means for generating a reference signal; cellular transmitting means coupled to the antenna means for transmitting cellular telephone call signals on said cellular radio channels; cellular receiving means coupled to the antenna means and the reference signal for receiving cellular telephone call signals on said cellular radio channels, said cellular receiving means further including intermediate frequency means having dual-bandwidth filtering means and switching means for generating an intermediate frequency signal having a predetermined frequency, the dual-bandwidth filtering means switchable between a first predetermined bandwidth and a second predetermined bandwidth that has a magnitude less than that of the first predetermined bandwidth, and the switching means being responsive to a bandwidth control signal having first and second states for switching said dual-bandwidth filtering means between the first and second predetermined bandwidths, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first set of cellular radio channels using the first control program and on the second set of cellular radio channels using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first set of cellular radio channels and generating the second state of the bandwidth control signal for cellular telephone calls on said second set of cellular radio channel. - View Dependent Claims (14, 15, 16)
-
-
17. A cellular telephone communicating cellular telephone calls on a first set of cellular radio channels having a first cellular telephone signalling protocol and a second set of cellular radio channels having a second cellular telephone signalling protocol, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; transmitter filtering means coupled to the antenna means for filtering the transmitted cellular telephone call signals; receiver filtering means coupled to the antenna means for filtering the received cellular telephone call signals; dialing means for dialing digits of telephone numbers; synthesizing means for generating a reference signal; cellular transmitting means coupled to the transmitter filtering means for transmitting cellular telephone call signals on said cellular radio channels; cellular receiving means coupled to the receiver filtering means and the reference signal for receiving cellular telephone call signals on said cellular radio channels, said cellular receiving means further including intermediate frequency means having dual-bandwidth filtering means and switching means for generating an intermediate frequency signal having a predetermined frequency, the dual-bandwidth filtering means switchable between a first predetermined bandwidth and a second predetermined bandwidth that has a magnitude less than that of the first predetermined bandwidth, and the switching means being responsive to a bandwidth control signal having first and second states for switching said dual-bandwidth filtering means between the first and second predetermined bandwidths, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first set of cellular radio channels using the first control program and on the second set of cellular radio channels using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first set of cellular radio channels and generating the second state of the bandwidth control signal for cellular telephone calls on said second set of cellular radio channel. - View Dependent Claims (18, 19, 20)
-
-
21. A cellular telephone communicating cellular telephone calls on a first set of cellular radio channels having a first cellular telephone signalling protocol and a second set of cellular radio channels having a second cellular telephone signalling protocol, said cellular telephone comprising:
-
antenna means for receiving and transmitting cellular telephone call signals on said cellular radio channels; dialing means for dialing digits of telephone numbers; synthesizing means for generating a reference signal; cellular transmitting means coupled to the antenna means for transmitting cellular telephone call signals on said cellular radio channels; cellular receiving means coupled to the antenna means and the reference signal for receiving cellular telephone call signals on said cellular radio channels, said cellular receiving means further including; first intermediate frequency means including first filtering means having a first predetermined bandwidth for generating a first intermediate frequency signal; second intermediate frequency means coupled to the first intermediate frequency signal and including dual-bandwidth second filtering means for generating a second intermediate frequency signal, the dual-bandwidth filtering means switchable between a second predetermined bandwidth and a third predetermined bandwidth that has a magnitude less than that of the second predetermined bandwidth; detecting means coupled to the second intermediate frequency signal for detecting the received cellular telephone call signals; and switching means responsive to a bandwidth control signal having first and second states for for switching said dual-bandwidth second filtering means between the second and third predetermined bandwidths, respectively; and control means including memory means for storing first and second control programs, said control means being coupled to the dialing means, cellular transmitting means, and cellular receiving means for automatically transmitting and receiving cellular telephone calls on the first set of cellular radio channels using the first control program and on the second set of cellular radio channels using the second control program, said control means generating the first state of the bandwidth control signal for cellular telephone calls on said first set of cellular radio channels and generating the second state of the bandwidth control signal for cellular telephone calls on said second set of cellular radio channel. - View Dependent Claims (22, 23, 24)
-
Specification