KVM switch and method of controlling the same

• US 20080117172A1
• Filed: 11/20/2007
• Published: 05/22/2008
• Est. Priority Date: 11/22/2006
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Sakurai, Satoshi, Yasuno, Kazuhiro, Ideura, Katsuji, Seki, Fujio
• Granted Patent: US 8,169,407 B2
• Time in Patent Office: Days
• US Class Current: 345/168
• CPC Class Codes: G06F 3/0227 Cooperation and interconnection of the input arrangement with other functional units of a computer G06F3/023 - G06F3/037 take precedence
• 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

Abstract

A KVM switch including server units that are respectively connected to computers units, user units that are respectively connected to input-output units inputting and outputting a signal to the computer units, and a main unit that connects the server units and the user units selectively. The input-output unit switches between the computer units where the signal is input and output. The server unit has a first reference signal generator that generates a first reference signal used for a distortion control of a picture signal. The main unit has a first controller receiving the first reference signal and controlling the distortion of the picture signal and a second reference signal generator generating a second reference signal used for the distortion control of the picture signal. The user unit has a second controller that receives the second reference signal and controls the distortion of the picture signal.

Claims

1. A KVM switch comprising:

server units that are respectively connected to computers units;

user units that are respectively connected to input-output units inputting and outputting a signal to the computer units; and

a main unit that connects the server units and the user units selectively,

wherein;

the input-output unit switches between the computer units where the signal is input and output;

the server unit has a first reference signal generator that generates a first reference signal used for a distortion control of a picture signal;

the main unit has a first controller receiving the first reference signal and controlling the distortion of the picture signal and a second reference signal generator generating a second reference signal used for the distortion control of the picture signal; and

the user unit has a second controller that receives the second reference signal and controls the distortion of the picture signal.

2. The KVM switch as claimed in claim 1, wherein the first controller and the second controller calculate a distortion amount of a received reference signal, and control a picture signal according to the distortion amount.

3. The KVM switch as claimed in claim 1, wherein at least one of the first controller and the second controller receives an operation input from the input-output unit and controls the distortion of the picture signal.

4. The KVM switch as claimed in claim 2, wherein at least one of the first controller and the second controller measures the distortion amount of a signal more than once, determines at least one of a maximum value and a minimum value of the distortion amount, and determines that the distortion of the picture signal cannot be controlled if at least one of the maximum value and the minimum value is out of a given range.

5. A method of controlling a KVM switch having server units that are respectively connected to computers units, user units that are respectively connected to input-output units, and a main unit that connects the server units and the user units selectively, comprising:

generating a first reference signal used for a distortion control of a picture signal with the server unit;

receiving the first reference signal with the main unit;

controlling the distortion of the picture signal with the main unit;

generating a second reference signal used for the distortion control of the picture signal with the main unit;

receiving the second reference signal with the user unit; and

controlling the distortion of the picture signal with the user unit.