Data and voice cordless telephone system

• US 5,930,719 A
• Filed: 09/19/1996
• Issued: 07/27/1999
• Est. Priority Date: 09/19/1996
• Status: Expired due to Fees

• Current Assignee: Wireless Logic
• Original Assignee: Wireless Logic
• Inventors: Babitch, Daniel, Wong, James, Varadi, Andrew G.
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US08/715,938
• Time in Patent Office: 1,041 Days
• Field of Search: 455/403, 455/418, 455/462, 455/465, 455/557, 375/220, 375/222
• US Class Current: 455/462
• CPC Class Codes: H04M 1/6505 storing speech in digital form
• CPC Class Codes: H04M 1/72409 by interfacing with external accessories hands-free H04M1/60
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04M 1/72513 On hold, intercom or transfer communication modes

Abstract

A cordless system comprises a laptop computer with a modem connected to a modem data port on a cordless telephone handset. A direct sequence spread spectrum RF link is established between the cordless telephone handset and a base station. Both the telephone network and a desktop computer with a modem are connected to the base station. When the cordless telephone handset detects that the laptop computer wants to go off-hook, a selection signal is also sent by the cordless telephone handset to the base station to indicate whether the call is to be directed to the telephone network or the desktop computer. When the base station detects that the desktop computer wants to go off-hook, a selection signal is also sent by the desktop computer to the base station to indicate whether the call is to be directed to the telephone network or over the RF link to the laptop computer. Incoming calls from the telephone network are directed to the desktop computer by the base station with a ring indication going to the cordless telephone handset. If the laptop computer answers the ringing, the cordless telephone handset indicates an off-hook condition to the base station and the base station routes the incoming call over the RF link to the cordless telephone handset and the laptop computer.

Claims

1. A wireless communication system, comprising:

a remote station having a first radio frequency transceiver that provides for a radio link and that provides for a connection to a telephone interface of a modem;

a base station having a second radio frequency transceiver that provides for operation with said radio link and that includes a connection for a telephone line;

an echo canceller having training speed substantially faster than that of an echo canceller in an attached modem and that is connected between said telephone line and said base station radio frequency transceiver; and

an automatic gain control circuit disposed between said telephone line and said base station radio frequency transceiver;

wherein, analog modulation is used for information communicated by said radio frequency transceivers.

2. The system of claim 1, further comprising:

a desktop computer connected to communicate data over said radio link;

routing means for detecting whether information for the base station is to be routed to the desktop computer or to said telephone line; and

connection means for switching the base station between the desktop computer and said telephone line.

3. The system of claim 1, further comprising:

voice interfacing means for carrying voice signals over said radio link;

discriminating means for detecting whether an input signal to be carried over said radio link is a data signal or a voice signal;

channeling means for switching said voice and data signal to follow appropriate paths to their intended destinations; and

bypassing means for including or not including a corresponding radio transmit or receive filters according to whether voice or data signals have been detected by the discriminating means.

4. The system of claim 1, further comprising:

a desktop computer connected to communicate data over said radio link;

routing means for detecting whether information for the base station is to be routed to the desktop computer or to said telephone line;

connection means for switching the base station between the desktop computer and said telephone line;

voice interfacing means for carrying voice signals over said radio link;

discriminating means for detecting whether an input signal to be carried over said radio link is a data signal or a voice signal;

channeling means for switching said voice and data signal to follow appropriate paths to their intended destinations; and

bypassing means for including or not including a corresponding radio transmit or receive filters according to whether voice or data signals have been detected by the discriminating means.

5. A wireless communication system, comprising:

a cordless telephone handset having a first radio frequency transceiver and connected to a microphone and speaker for voice communication over a radio frequency link;

a first data port disposed in the cordless handset and providing for modem support and a corded connection of a first computer proximate to the cordless telephone handset;

a handset interface with a 2;

4-wire hybrid disposed in the cordless telephone handset and connected to the first data port;

a first microcomputer-controlled switch disposed in the cordless telephone handset and connected to the handset interface to select between data signals from the first data port and voice signals from said microphone for transmission by said radio transceiver;

a cordless telephone base station having a second radio frequency transceiver for operation with said radio link;

a second data port disposed in the cordless telephone base station and providing for modem support and a corded connection of a second computer proximate to the cordless telephone base station;

a base interface with a 2;

4-wire hybrid disposed in the cordless telephone base station;

a telephone line port disposed in the cordless telephone base station and providing for connection of the public switched telephone network (PSTN) to the base interface; and

a second microcomputer-controlled switch disposed in the cordless base station and connected to select between the second data port and the telephone line port.

6. The system of claim 5, wherein:

the base interface further includes a digital signal processor for echo cancellation of data signals transferring only between the first and second computers via the cordless telephone handset and the cordless telephone base station.

7. The system of claim 5, wherein:

the base interface further includes a digital signal processor for automatic gain control of data signals transferring only between the first and second computers via the cordless telephone handset and the cordless telephone base station.

8. The system of claim 5, wherein:

the base interface further includes a digital signal processor for automatic gain control, echo cancellation and automatic data detection of signals transferring only between the first and second computers via the cordless telephone handset and the cordless telephone base station.

9. The system of claim 5, further comprising:

a transmit filter for limiting the bandwidth of signals provided by the base interface to said second radio transceiver; and

a third microcomputer-controlled switch connected between the base interface and said second radio transceiver for selectively enabling the transmit filter.

10. A cordless telephone base station, comprising:

a radio frequency transceiver for communication with a cordless telephone handset over a radio link;

a data port providing for modem support and a corded connection of a nearby computer;

a base interface with a 2;

4-wire hybrid;

a telephone line port providing for connection of the public switched telephone network (PSTN) to the base interface; and

a microcomputer-controlled switch disposed in the cordless base station and connected to select between the data port and the telephone line port.

11. The system of claim 10, wherein:

the base interface further includes a digital signal processor for echo cancellation of data signals transferring only between said cordless telephone handset and said nearby computer.

12. The system of claim 10, wherein:

the base interface further includes a digital signal processor for automatic gain control of data signals transferring only between said cordless telephone handset and said nearby computer.

13. The system of claim 10, wherein:

the base interface further includes a digital signal processor for automatic gain control, echo cancellation and automatic data detection of signals transferring only between said cordless telephone handset and said nearby computer.