40 results about "Buffer underrun" patented technology

At the time of data recording onto a disk, when an external power source connection detecting circuit (12) detects that connection of an external power source is released, the currently set rotation speed is recognized. When the current rotation speed cannot be achieved in a maximum speed restricting mode, the processing speed is switched to the maximum speed that can be achieved in the maximum speed restricting mode. At the time of data reproduction on a disk, when the external power source connection detecting circuit (12) detects that the connecting power source is switched to the external power source, the processing speed is automatically switched to the maximum disk rotation speed regardless of the maximum speed restricting mode.

In adaptive streaming, video segments are available in one or more quality levels, and each video segment is de livered to the client (103) in a quality level specified in a request received from that client (103). In order to reduce the risk for buffer underrun, an adaptive streaming aware network node (101) comprises: —session monitoring means (111) for collecting buffer fill information indicative for a buffer volume at the client (101) occupied by a video session; —priority calculation means (112) for determining a priority level for video segments of the session in function of the buffer fill information; and—video segment marking means (113) for marking video segments of the session with the priority level.

An optical disk apparatus, which greatly decreases probability of impossibility of correcting an error in reading, is provided, where the error results from deviation of a writing-resuming position in resumption of writing. When an amount of data in a buffer becomes not more than a given amount of data, a buffer-underrun-detecting-circuit judges that the data are in a buffer-underrun-condition. According to the judgement, a writing-interrupting-and-resuming-circuit detects an end position of the last pit for writing, and the position is stored in a time-information-memory, and the optical disk apparatus becomes in a pause condition of writing. When the buffer-underrun-condition is avoided, the optical disk apparatus releases the pause condition of writing, and reads the position of interruption of writing from the time-information-memory, and then synchronizes data written on an optical disk and the data for writing. After that, writing is resumed with a given interval formed between the data written and the data for writing.

A data recording equipment that accurately restarts the writing of data to an optical disc after data recording is interrupted. The equipment interrupts recording when detecting an external shock or when predicting the occurrence of a buffer underrun error. The equipment includes a counter, which counts execution of recording data on the optical disc and generates a count value indicating the amount of data that is recorded, and a control unit, which is connected to the counter to hold the count value of the counter immediately before an interruption when the recording of data is interrupted. The unit re-irradiates a position on the optical disc, on which data prior to the data recorded immediately before the interruption is recorded. The init controls restart of the recording based on the held count value while recognizing the position of the data on the optical disc.

A method of preventing buffer underrun and buffer overrun errors in a data processing system is disclosed. The method includes providing a reference frequency for the data processing system, storing data samples to be processed in a first in, first out (FIFO) register, detecting a level of the FIFO register for indicating how many data samples are stored in the FIFO register, dividing the reference frequency by a divisor for producing a working frequency having a lower frequency than the reference frequency, wherein the divisor is not equal to zero and the divisor is adjusted according to the level of the FIFO register, and processing the data samples stored in the FIFO register using the working frequency.

Systems and methods are provided to implement a technique for providing 3D content, such as on optical media like Blu-ray® discs. In one implementation, a 3D authoring tool executing on a computer system manages how to construct an image for replication where the image handles jumps without buffer underruns, the jumps caused by layer switching or by moving from or to branches in a multi-branch story line.

A programmatic time-gap defect correction apparatus and method corrects errors which may go undetected by a computer system. Buffer underruns or overruns, which may incur errors in data transfers, yet remain undetected and uncorrected in a computer system, are corrected by an error avoidance module in accordance with the invention. Bytes transferred to and from buffers, used by an I / O controllers to temporarily store data while being transferred between synchronous and asynchronous devices, are counted and an error condition is forced based on the count. If the count exceeds the capacity of the buffer, an error condition is forced, thereby reducing chances that errors are incurred into the data transfer.

In adaptive streaming, video segments are available in one or more quality levels, and each video segment is delivered to the client (103) in a quality level specified in a request received from that client (103). In order to reduce the risk for buffer underrun, an adaptive streaming aware network node (101) comprises: —session monitoring means (111) for collecting buffer fill information indicative for a buffer volume at the client (101) occupied by a video session; —priority calculation means (112) for determining a priority level for video segments of the session in function of the buffer fill information; and —video segment marking means (113) for marking video segments of the session with the priority level.

A programmatic time-gap defect correction apparatus and method corrects errors which may go undetected by a computer system. Buffer underruns or overruns, which may incur errors in data transfers, yet remain undetected and uncorrected in a computer system, are corrected by an error avoidance module in accordance with the invention. Bytes transferred to and from buffers, used by an I / O controllers to temporarily store data while being transferred between synchronous and asynchronous devices, are counted and an error condition is forced based on the count. If the count exceeds the capacity of the buffer, an error condition is forced, thereby reducing chances that errors are incurred into the data transfer.

A controller for controlling interruptions and restarts when writing data to a recording medium by emitting a laser beam against the recording medium. The controller prevents buffer underrun errors. The laser beam is emitted at a high power level when writing data on the recording medium and at a low power read level when reading data from the medium. The writing of data is interrupted when there is a possibility of a buffer underrun error. When restarting data writing from where the interruption occurred, the laser beam is shifted from the read level to the write level before reaching the location at which the interruption occurred. This guarantees that the laser beam has the required power level when writing is restarted.

A method of preventing buffer underrun and buffer overrun errors in a data processing system is disclosed. The method includes providing a reference frequency for the data processing system, storing data samples to be processed in a first in, first out (FIFO) register, detecting a level of the FIFO register for indicating how many data samples are stored in the FIFO register, dividing the reference frequency by a divisor for producing a working frequency having a lower frequency than the reference frequency, wherein the divisor is not equal to zero and the divisor is adjusted according to the level of the FIFO register, and processing the data samples stored in the FIFO register using the working frequency.

A graphics system may include a display pipe with a buffer configured to store pixels to be processed by a display controller for displaying on a display device, with a buffer control circuit coupled to the buffer to supply pixels to the display controller. When the buffer control circuit detects an underrun of the buffer responsive to the display controller attempting to read pixels from the buffer that have not yet been written to the buffer, the buffer control circuit may supply an underrun pixel to the display. The underrun pixel may be selected from a set of previously stored set of underrun pixels, which may include a most recent valid pixel read by the display controller. A read pointer representative of the location in the buffer from where the display controller is currently attempting to read may be advanced even when an underrun condition occurs. The underrun pixel may be supplied to the display controller until the underrun has been resolved, at which point the most recent valid pixel read from the buffer may be supplied to the display controller.

A method and controller are provided for performing a non-contiguous streaming of a media stream. Such non-contiguous streaming comprises transmitting a selected portion of the media stream to the receiver while omitting transmitting at least an immediately adjacent portion of the media stream so as to enable uninterrupted play-out of the selected portion by the receiver after a pre-determined play-out delay. Such non-contiguous streaming may be advantageously used when the content bitrate exceeds the available network bandwidth. Namely, instead of streaming all of the media stream, only one or more selected and non- adjacent portions thereof are streamed, while omitting transmitting one or more intermediate portions. Effectively, the available network bandwidth may be allocated for transmitting only selected portions of the media stream to enable said portions each to be played-out uninterruptedly by the receiver after a pre-determined play-out delay and at the original content bitrate. Buffer underruns at the receiver may thereby be prevented.

An apparatus and method for controlling a recording signal are provided. The apparatus may include a light generator generating light used to write information to an optical disk, a light amount compensator setting a voltage level of the recording signal as a second level when the write operation is performed or stopped, and a light amount controller supplying energy to the light generator based on the second level of the recording signal until the voltage level of the recording signal reaches a first level when a rewrite operation is started and controlling the light generated by the light generator to be constant after the voltage level of the recording signal reaches the first level. The apparatus and method for controlling the recording signal may reduce write quality deterioration due to a lack of initial power of the recording signal when an optical disk recording apparatus starts a rewrite operation after stopping a write operation due to buffer underrun, insecure servo signals, wobble quality, contamination of discs, changes in recording speeds, and / or external shocks.