KVM VIDEO & OSD SWITCH

• US 20100050226A1
• Filed: 10/23/2009
• Published: 02/25/2010
• Est. Priority Date: 01/05/2002
• Status: Active Grant

• Current Assignee: Belkin International Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Belkin International Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: King, Randy J., Voll, Parker J.
• Granted Patent: US 7,889,277 B2
• Time in Patent Office: Days
• US Class Current: 725/149
• CPC Class Codes: G06F 3/023 Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2370/24 Keyboard-Video-Mouse [KVM] switch

Abstract

A high speed video switch in a KVM system using discrete Radio Frequency (RF) switch circuits. The RF switch circuits are configured into a multiplexed circuit to route video signals from a selected host computer to a target monitor. Voltage converters are used to provide control signals of the proper voltage to the RF switch circuits. Peaking operational amplifiers are used to compensate for the roll-off effect caused by the video connectors. An On Screen Display (OSD) switch using the RF switches is used to rapidly switch between the OSD data and host computer video for display to the target operator control center monitor.

Claims

1. An apparatus comprising:

a first means configured to emit a video select signal;

a voltage converter having an input and an output, wherein the video select signal is coupled to the input of the voltage converter; and

a second means comprising a control terminal, a video input terminal, and a video output terminal;

wherein;

the video input terminal of the second means is configured to receive a video output of a first computer;

the output of the voltage converter is coupled to the control terminal of the second means to control a switching of the second means; and

the second means is configured to switch at least a portion of the video output of the first computer.