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2328 results about "Transmission bandwidth" patented technology

Transmission bandwidth is the actual width of the transmitted signal. It is often narrower than the channel bandwidth to allow practical transmit filters to be used to ensure that the modulated signal does not spread out beyond the channel bandwidth. An example. LTE has a maximum 20 MHz channel bandwidth.

Apparatus and method for communicating voice and data between a customer premises and a central office

A method and apparatus are provided for communicating data across a communication link, in a manner that senses and dynamically adapts to the simultaneous transmission of voice information across the local loop. In accordance with one aspect of the invention, a method is provided for dynamically communicating data over a local loop using a modem comprising the steps of transmitting data in a full-band transmission state, sensing a band-limiting condition, and adjusting the transmission of data from the full-band transmission state to a bandlimited transmission state, in response to the sensing step. In accordance with the method, data may be transmitted by the modem across the local loop at the same time that voice information is communicated via telephone across the same local loop. A significant aspect of the present invention is the dynamic allocation of the data transmission bandwidth, whereby the invention senses a condition indicative of whether voice information is being communicated. If so, then the system shifts and / or narrows the data transmission bandwidth to allow for voice communications without interference from or with the data transmission. However, when no voice information is being communicated, the invention dynamically allocates the data transmission bandwidth to utilize at least a portion, if not all, of the frequency band otherwise used for communicating voice information.
Owner:PARADYNE CORP

Self-adapting transmission method and system in ascending honeycomb video communication

InactiveCN101222296AImprove playback qualityReduce packet loss eventsError preventionData streamPacket loss
The invention discloses a self-adaptive transmission method and a self-adaptive transmission system in the uplink cellular video communication of the wireless multimedia communication technical field. The method is that: a feedback-based channel effectively transmits bandwidth perceiving; the sending speed of a data flow is adjusted according to the perceived effective transmission bandwidth, the adjustment of the sending rate is realized by changing the packet length of the data flow; two-stage information resource rate control based on cache cleaning and rate control of an encoder is used. The device comprises a sending end, a transmission network and a receiving end, wherein the sending end comprises a video encoding unit and a transmission control unit, the receiving end comprises a transmission control unit and a video decoding unit, the sending end and the receiving end transmit messages through the transmission network. The sending rate of the invention can automatically adapt to the change of the channel bandwidth, decreases the probability of packet loss caused by the fluctuation of the wireless channel bandwidth, and realizes that the customer side can obtain the best possible playing quality under the condition of constant change of network operation conditions.
Owner:SHANGHAI JIAO TONG UNIV

Transmission bandwidth and memory requirements reduction in a portable image capture device by eliminating duplicate image transmissions

A system and method for reducing storage and transmission bandwidth requirements of a portable image capture device capable of establishing a communications connection on a network are disclosed. The method includes assigning an image identifier to captured images uploaded to a server on a network, wherein each of the images is stored in an image file having a particular size. The size of each of the image files corresponding to the uploaded images on the image capture device may then be reduced, thereby reducing storage requirements. In response to a user request to apply an action to one of the uploaded images, only the image identifier of the image and the requested action are transmitted to the server, thereby eliminating the need to retransmit the image and reducing transmission bandwidth requirements.
Owner:DIGIMEDIA TECH LLC +1

Multi-subband frequency hopping communication system and method

The invention provides an adaptive frequency hopping spread-spectrum (FHSS) transmission system and method, which efficiently utilizes available transmission bandwidth, whilst providing robustness to jamming techniques in wireless communication systems. The proposed technique operates by transmitting a wide-band signal over multiple, single-carrier, parallel transmission subbands, which may occupy non-contiguous frequency regions. The proposed scheme exhibits significant gain in error rate performance, as compared to a data rate equivalent single-subband system in the presence of signal jamming and / or interference without a reduction in the transmission data rate nor an increase in transmitter power. In addition, the proposed system and method are adaptive and enable more efficient use of the available bandwidth for communicating, thus increasing the overall bandwidth utilization of the system.
Owner:HER MAJESTY THE QUEEN & RIGHT OF CANADA REPRESENTED BY THE MIN OF IND THROUGH THE COMM RES CENT

Transmission system and method for assigning transmission channel

A transmission terminal measures an error rate by periodically transmitting an error rate measuring packet to all transmission channels and all transmission paths. Content to be transmitted is classified, so that a transmission channel of the best transmission quality is assigned to content requiring real-timeness and a wide transmission bandwidth. According to the type of the content, a required communication protocol is selected to perform processing thereof. The transmission bandwidth for the content requiring a wide transmission bandwidth is assigned at a peak rate, while the transmission bandwidth for the content requiring a narrow transmission bandwidth is assigned at an average rate.
Owner:CANON KK

Method and device for achieving virtual machine communication

The invention provides a method and a device, a first interchanger receives an ARP response from an SDN controller, the ARP response carries an MAC address of a destination gateway, the first interchanger acquires a VTEP message corresponding to the MAC address of the destination gateway in dependence on the MAC address of the destination gateway, and a router corresponding to the VTEP message is arranged in a first data center; the first interchanger sends an IP message to the router corresponding to the VTEP message in dependence on the VTEP message, and therefore the router corresponding to the VTEP message sends the IP message to a second virtual machine through the router and a channel of a second interchanger. Therefore, the SDN controller answers instead, the transmission bandwidth occupied by broadcasting messages is reduced, and the messages only pass through the router in the first data center, and the messages are prevented from detouring among data centers.
Owner:HUAWEI TECH CO LTD

Server system for performing communication over wireless network and operating method thereof

Disclosed are a server system for performing moving picture data communication with a client device over a wireless network, and an operating method thereof. A server device compresses the moving picture data received from an external medium at a variably controlled compression rate according to transmission bandwidth of the current wireless network and an image quality level set by a user in response to a request of the client device. Moreover, the server device transmits the compressed moving picture data to the client device in a wireless fashion. Therefore, transmission delay and playback delay can be avoided and data loss is avoided during a data transmission operation, such that stable data communication can be performed.
Owner:LG ELECTRONICS INC

Audio/video file playing method and system as well as transmission control device

The invention discloses an audio / video file playing method and system as well as a transmission control device. The audio / video file playing method comprises the following steps of: compressing and coding an audio / video file into a plurality of audio / video stream data according to different code rates; partitioning each audio / video stream datum into audio / video file slices according to same time segments and generating an index file; acquiring terminal transmission bandwidth data, selecting the audio / video file slices adapting to terminal transmission bandwidth according to the index file and sending the audio / video file slices to a terminal to be played. By adopting the technical scheme provided by the invention, the problem of unsmooth playing brought by network bandwidth fluctuation in the audio / video playing process is solved, and the experience of a user in the process of watching audio / video programs is improved.
Owner:上海天脉聚源文化传媒有限公司

Perceptual synthesis of auditory scenes

An auditory scene is synthesized by applying two or more different sets of one or more spatial parameters (e.g., an inter-ear level difference (ILD), inter-ear time difference (ITD), and/or head-related transfer function (HRTF)) to two or more different frequency bands of a combined audio signal, where each different frequency band is treated as if it corresponded to a single audio source in the auditory scene. In one embodiment, the combined audio signal corresponds to the combination of two or more different source signals, where each different frequency band corresponds to a region of the combined audio signal in which one of the source signals dominates the others. In this embodiment, the different sets of spatial parameters are applied to synthesize an auditory scene comprising the different source signals. In another embodiment, the combined audio signal corresponds to the combination of the left and right audio signals of a binaural signal corresponding to an input auditory scene. In this embodiment, the different sets of spatial parameters are applied to reconstruct the input auditory scene. In either case, transmission bandwidth requirements are reduced by reducing to one the number of different audio signals that need to be transmitted to a receiver configured to synthesize/reconstruct the auditory scene.
Owner:AVAGO TECH INT SALES PTE LTD

System and method for effectively encoding and decoding electronic information

A system and method for effectively encoding and decoding electronic information includes an encoding system with a tiling module that initially divides source image data into data tiles. A frame differencing module then outputs only altered data tiles to various processing modules that convert the altered data tiles into corresponding tile components. A quantizer performs a compression procedure upon the tile components to generate compressed data according to an adjustable quantization parameter. An adaptive entropy selector then selects one of a plurality of available entropy encoders to most effectively perform an entropy encoding procedure to thereby produce encoded data. The entropy encoder may also utilize a feedback loop to adjust the quantization parameter in light of current transmission bandwidth characteristics.
Owner:MICROSOFT TECH LICENSING LLC

Method and system in a wireless communications network for the simultaneous transmission of both voice and non-voice data over a single radio frequency channel

A method and system in a wireless communications network for the simultaneous transmission of voice and non-voice data over a single dedicated radio frequency channel to a mobile unit having a primary transmission bandwidth. Initially, voice data are transmitted to a mobile unit via a primary time interval within a single dedicated radio frequency channel. An unoccupied secondary time interval available to the mobile unit is then identified. Thereafter, non-voice data are transmitted to the mobile unit via the secondary time interval, in response to identifying the secondary time interval. The primary transmission bandwidth of the mobile unit is next automatically broadened to encompass both the primary time interval and the secondary time interval. Finally, the primary time interval and the secondary time interval are linked within the single dedicated radio frequency channel to permit the subsequent processing of the voice and non-voice data as a single transmitted unit over the single dedicated radio frequency channel. In identifying an unoccupied secondary time interval available to the mobile unit, time intervals positioned adjacent the primary time interval are examined to determine occupancy. If an adjacent time interval is determined to be occupied, the call being processed within that adjacent time interval is handed off to another channel or mobile unit, leaving that adjacent time interval open and unoccupied. The non-voice data is then transmitted to the mobile unit via the adjacent time interval, such that the adjacent time interval comprises an identified secondary time interval available to the mobile unit. The wireless communications network may be composed of a cellular telephone network operating alone or in association with landline-based components.
Owner:APPLE INC

Method and apparatus for wireless image transmission to a projector

A method and apparatus is provided in which a digital image is transmitted to a presentation projector resource over a wireless transmission medium using a reduced amount of transmission bandwidth by transmitting a subset of the digital image data. The subset image data may be a delta subset that represents those areas of the image that have changed since the previous transmission. The subset image data may also be a scalable vector graphics representation of the subset of the digital image. Header data is provided to further describe the subset image data. A projector discovery logic selects a suitable projector resource based on the order or signal strength of the discovery replies. A wireless image transmission session is established with the selected projector resource during which the projector is unavailable to other devices. The subset image data may be compressed and transmission coordinated with the projector resource so that the data is sent only when it is ready to be received. A wireless to digital visual interface (DVI) graphics engine decompresses and renders the image for output to a DVI connector receptacle. The rendered image is projected by the projector resource in accordance with the associated header data so that the exact image that appears on the image generation device also appears on the projected display.
Owner:SEIKO EPSON CORP

Wired/wireless broadcasting distribution apparatus having a home broadcasting distribution function and broadcasting channel formation/termination method using the same

The present invention relates to a wired / wireless broadcasting distribution apparatus having a home broadcasting distribution function and a broadcasting channel formation / termination method using the same. A wired / wireless broadcasting distribution apparatus according the present invention receives HD-grade multi-channel ground wave / satellite / cable broadcasting signals, and converts the received broadcasting signals into an IEEE1394 Isochronous packet or converts the IEEE1394 Isochronous packet into a UWB wireless signal, and transmits the IEEE1394 Isochronous packet or the UWB wireless signal to a home client, thereby making it possible to distribute HD-grade multi-channel wired / wireless broadcasting signals requiring a transmission bandwidth of hundreds Mbps to home clients irrespective of place.
Owner:ELECTRONICS & TELECOMM RES INST
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