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Mechanism for IrDA detection based on polarized filters

IP.com Disclosure Number: IPCOM000234718D
Publication Date: 2014-Jan-30
Document File: 2 page(s) / 54K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a mechanism to add a polarization filter to remote control devices using Infrared Data Association (IrDA). With this mechanism, a single remote control can control multiple entertainment devices based solely on the orientation of the controller.

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Mechanism for IrDA detection based on polarized filters

Personal entertainment systems often include multiple Infrared Data Association (IrDA) capable units (e.g., television (TV), receiver, digital video disk (DVD) player, cable box, etc.). Often each IrDA unit has a dedicated remote control, which causes problems for the user when multiple remote controls must be used. Some IrDAs share a single remote control with a mode select button. Additionally, programmable remotes can learn the desired functions. All such devices use randomly polarized infrared (IR) transmitters to communicate with the device.

A system is needed whereby a single remote is sufficient for controlling multiple devices.

The novel contribution is a way to add a polarization filter to the devices. With this mechanism, a single remote control can control multiple entertainment devices based solely on the orientation of the controller. This allows a user to easily switch between controlling the devices by simply rotating the remote to a known orientation. The user does not need to manually select a device to control, but simply holds the remote in a particular position. Additionally, the mechanism described enables features not already available by competing solutions.

Figure: Polarization of Light Waves, Vertical vs. Horizontal

A polarization filter can easily be added to the output IR diode of a remote. The IR receivers of two devices also have input polarization filters, which need to be a si...