Avocent Corporation Patent applications |
Patent application number | Title | Published |
20130266062 | VIDEO COMPRESSION ENCODER - A video compression system is disclosed that is optimized to take advantage of the types of redundancies typically occurring on computer screens and the types of video loss acceptable to real time interactive computer users. It automatically adapts to a wide variety of changing network bandwidth conditions and can accommodate any video resolution and an unlimited number of colors. The disclosed video compression encoder can be implemented with either hardware or software and it compresses the source video into a series of data packets that are a fixed length of 8 bits or more. Sequences of one or more of these packets create unique encoding “commands” that can be sent over any network and easily decoded (decompressed) with either software or hardware. The commands include 3 dimensional copying (horizontal, vertical and time) and unique efficiencies for screen segments that are comprised of only two colors (such as text). Embodiments are also disclosed that improve the video compression depending on the popularity of pixel colors. | 10-10-2013 |
20130136192 | VIDEO COMPRESSION ENCODER - A video compression encoder which does not require a video frame buffer is disclosed. Without a frame buffer, incoming pixels can not be compared to pixels previously sent to the decoder. Instead, the disclosed encoder only stores check values for groups of pixels sent. If a group's check value has not changed, the encoder sends a command to the decoder not to change that pixel group. Also, without a frame buffer, an incoming video frame can not be captured and later sent to the decoder as network throughput permits. Instead, if throughput is insufficient to send an encoded group of pixels, the encoder leaves the check value for that group unchanged and sends a command instructing the decoder not to change those pixels. This defers updating that group until the next screen update is sent to the decoder. Grouping of pixels can be done in any fashion, for example; a group can be a single video line, a portion of a line, multiple lines or screen rectangles containing portions of multiple lines. | 05-30-2013 |
20100327059 | Method and system for smart card virtualization - Methods and systems are provided to allow personal computer users to virtualize a local smart card so that they can remotely connect to a server and interact with the server as if the local smart card was physically connected to the server. They connect a remote smart card target hardware device to the target system through a physical connection, such as a USB connection, and the device interacts with the local user's computer and smart card reader over a network. The target system is unaware that the smart card reader is not connected directly to the system through a physical connection, and the target system does not need special software to implement the remote smart card reader. The smart card target device connected to the target computer may be physically connected and disconnected. | 12-30-2010 |
20100045864 | Twisted pair communications line system - A transmission system for transmitting analog color video signals wherein a cable comprising multiple twisted pairs is employed, and certain of these pairs are coupled to carry selected color signals as a function of the delay provided by particular twist rates. In certain instances, selected signal delay devices are connected in circuit with certain twisted pairs. By such an arrangement, it has been found that relatively long distances between a computer and a monitor may be spanned by relatively low-cost, twisted pair cable commonly used for telephone communications. | 02-25-2010 |
20090290647 | DVC Delta commands - A video compression system compresses video frames comprising pixels defined by n-bit color values. Encoder of video compression system determines the difference between a current pixel value and a plurality reference pixel values. Encoder sends difference value to decoder. Decoder determines current pixel value by adjusting a reference pixel color value by delta value. | 11-26-2009 |
20090144468 | Method and system for reducing multiple keystroke output - A method for reducing the erroneous display of multiple keystrokes on a target computer, that occur when depressing a key a single time on a Universal Serial Bus (USB) based keyboard from a remote computer. The invention eliminates the time lapse between the key press and key released events to produce single keystrokes on the target computer, instead of erroneous multiple keystrokes. | 06-04-2009 |
20090116552 | Video compression system - A video compression system is disclosed that is optimized to take advantage of the types of redundancies typically occurring on computer screens and the types of video loss acceptable to real time interactive computer users. It automatically adapts to a wide variety of changing network bandwidth conditions and can accommodate any video resolution and an unlimited number of colors. The disclosed video compression encoder can be implemented with either hardware or software and it compresses the source video into a series of data packets that are a fixed length of 8 bits or more. Sequences of one or more of these packets create unique encoding “commands” that can be sent over any network and easily decoded (decompressed) with either software or hardware. The commands include 3 dimensional copying (horizontal, vertical and time) and unique efficiencies for screen segments that are comprised of only two colors (such as text). Embodiments are also disclosed that improve the video compression depending on the popularity of pixel colors. | 05-07-2009 |
20080288677 | KVM switch system with a simplified external controller - A KVM switch system with external control functionality is described. A KVM switch is able to be controlled from an external device. The external device can either include a single button dedicated to controlling the desktop KVM switch or indicate a state of the KVM switch. The external device can be connected to the desktop KVM switch through a plurality of communication media. The external device can be small in size and attached to an object on a user's desktop. | 11-20-2008 |