Method of minimizing interference between devices which communicate in overlapping communication bands

• US 6,415,136 B1
• Filed: 05/18/1999
• Issued: 07/02/2002
• Est. Priority Date: 05/18/1999
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Plocher, Peter H.
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US09/313,807
• Time in Patent Office: 1,141 Days
• Field of Search: 455/62, 455/63, 455/9, 455/10, 455/501, 455/504, 455/553, 455/103, 340/825.35, 340/825.55, 235/383
• US Class Current: 455/63.3
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10

Abstract

A communication system which uses a multi-mode transmitter to communicate in a serial fashion with first and second wireless devices. The system includes a transmitter, a first transmitter control circuit which allows the transmitter to communicate with a first communication device, a second transmitter control circuit which allows the transmitter to communicate with a second communication device, a first receiver circuit which receives signals from the first communication device, a second receiver circuit which receives signals from the communication device, and a switch circuit. In one embodiment, the system additionally includes a controller coupled to the first and second receiver circuits which causes the switch circuit to select the first transmitter control circuit during a first time period and the second transmitter control circuit during a second time period different than the first time period.

Claims

1. A method of minimizing interference between first and second communicating devices which communicate in first and second overlapping communication bands in a transaction establishment comprising the steps of:

receiving a first signal in the first communication band from the first device by a controller through a first receiving circuit;

connecting only a first transmitter control circuit of at least two transmitter control circuits to a transmitter by the controller in response to the first signal, wherein the first transmitter control circuit operates in the first communication band and the second transmitter control circuit operates in the second communication band;

transmitting a second signal in the first communication band by the transmitter to the first device in response to control signals from the first transmitter control circuit;

disconnecting the first transmitter control circuit from the transmitter by the controller following transmission of the second signal by the transmitter;

receiving a third signal from the second device in the second communication band by the controller through a second receiving circuit;

connecting only the second transmitter control circuit to the transmitter by the controller in response to the third signal;

transmitting a fourth signal in the second communication band by the transmitter to the second device; and

disconnecting the second transmitter control circuit from the transmitter by the controller following transmission of the fourth signal by the transmitter.

2. A method of minimizing interference between first and second communicating devices which communicate in first and second overlapping communication bands in a transaction establishment comprising the steps of:

receiving a first signal in the first communication band from the first device by a controller through a first receiving circuit;

connecting only a first transmitter control circuit of at least two transmitter control circuits to a transmitter by the controller in response to the first signal, wherein the first transmitter control circuit operates in the first communication band and the second transmitter control circuit operates in the second communication band;

transmitting a second signal in the first communication band by the transmitter to the first device in response to control signals from the first transmitter control circuit;

disconnecting the first transmitter control circuit from the transmitter by the controller following transmission of the second signal by transmitter;

receiving a third signal from the second device in the second communication band by another controller through a second receiving circuit;

connecting only the second transmitter control circuit to the transmitter by the other controller in response to the third signal;

transmitting a fourth signal in the second communication band by the transmitter to the second device; and

disconnecting the second transmitter control circuit from the transmitter by the other controller following transmission of the fourth signal by the transmitter.