When a DVD is played the rate that data flows is not fixed. Complex, action and other dynamic scenes will result in higher data rates while still images require a lower data rate.!-- google_ad_client = "pub-6351068995715539"; google_alternate_color = "CCFFCC"; google_ad_width = 120; google_ad_height = 240; google_ad_format = "120x240_as"; google_ad_type = "text_image"; google_ad_channel ="3135690862"; google_color_border = "FFFFFF"; google_color_bg = "FFFFFF"; google_color_link = "336633"; google_color_url = "000000"; google_color_text = "000000";

A CD reads data at a constant rate. A DVD can read data at a variable rate. When the picture is very still, the video data can be compressed more so the bit rate is lower. This then allows a higher bit rate to be used for sequences of greater movement.

encoding process where the codec makes the choice for how many bits are used on each segment of music. More complex s VCD/SVCD

A 'bit' is a single piece of digital data. This data is compressed so that you can record more on a single disc. The Variable Bit Rate continuously controls the amount of compression for a more efficient recording.

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An ATM service category that is used for time-sensitive traffic suchas frame relay. Like CBR, VBR reserves a certain amount of bandwidth forthe connection. Unlike CBR, VBR can tolerate delays.

A quality of service, for ATM networks, with two subcategories. First is Variable Bit Rate - Real Time (VBR-RT) - for timing sensitive connections such as video or voice. Second is Variable Bit Rate - NonReal Time (VBR-NRT_ - used for bursty or other non-time-sensitive transmissions. Both types guarantee minimum delay and cell loss.

A method of compressing and encoding audio at a bit rate optimized for each section, or "frame," of sound, depending on the part's complexity. This allows for high fidelity, while helping to keep file size down.

VBR traffic is typically from bursty traffic sources and usually requires packetized bandwidth an demand for effective transport.

VBR) Real Time Variable Bit Rate ( r-t VBR) r-t VBR is an ATM quality of service category. It is used for bursty applications that require a minimum guarantee on bandwidth, cell loss level and a guaranteed upper bound on delay. This service is the foundation for compressed voice and video services. Non Real Time Variable Bit Rate Is an ATM quality of service category intended for non-real-time applications which have bursty traffic characteristics. This category supports guaranteed bandwidth, low cell loss but does not give any commitment on delay. It is often used for LAN interconnection.

A data transmission that can be represented by an irregular grouping of bits or cell payloads followed by unused bits or cell payloads.

An ATM service type that guarantees service based on average and peak traffic rates. VBR is used for traffic that requires little or no cell loss. It transmits data in spurts, or bursts, rather than in a continuous stream.

Operation where the bit rate varies with time during the decoding of a compressed bit stream.

Variable Bit Rate adjusts the bit rate depending on the sound. For example, if there is silence in a song, the bit rate would decrease and if there is a full symphonic sound the bit rate would increase. VBR offers a higher sound quality at a smaller file size.

A way of coding video to maximize image quality over a connection's available bandwidth, usually provided by more recent codecs.

This format offers a much better way to stream or download music because of increased efficiency when the file was encoded. Variable bitrate files yield the best sound quality all the time rather than just setting a maximum.

A type of compression wherein certain audio sections are encoded at different bit rates so that complex sounds are encoded at a higher rate while simple sounds are encoded at a lower rate, as opposed to standard bit rate encoding. This means you get the best sound possible for a certain amount of disk space, but certain players occasionally have problems decoding VBR audio files.

Bit rate varies with time during the decoding of a compressed bitstream. One example is MPEG-2 for DVD-Video where bit rate changes according to compression requirements to keep the average bit rate low. VBR encoding offers better quality than constant bit rate (CBR) at lower data rates.

encoding process where the codec makes the choice for how many bits are used on each segment of music. More complex segments get more bits. VBR was created with the goal of efficient use of file sizes.

Applications that produce traffic of varying bit rates, like common LAN applications, which produce varying throughput rates.

Variable bit rate specifies the sound quality level but allows the bit rate to fluctuate. During complex passages, VBR uses a higher-than-average bit rate but during simple passages uses a lower-than-average bit rate. VBRs save space without typically sounding worse.

Variable bit rate specifies the sound quality level but allows the bit rate to fluctuate. During complex passages, VBR uses a higher-than-average bit rate but during simple passages uses a lower-than-average bit rate. The result is that VBR produces an overall higher, more consistent sound quality compared to CBR at similar bit rates. See also: Constant Bit Rate (CBR).

DVD specifies a Constant Linear Velocity (CLV) of 3.49 m/s, giving a transfer rate of 11.08 Mbits/sec, although 9.8 Mbits/see is the top usable limit. But MPEG-2 implements variable bit rate encoding (often called variable rate bitstream encoding), because it helps to optimize quality in the program video stream while catering for maximum compression. Essentially, the sequences with high level of motion are allowed higher data rates than the sequences with low levels of motion. It uses track buffers, intermittent reads, and even a complete double pass process to achieve a high quality data stream within the allocated bandwidth (variable bit rate decoding for the video, the audio streams, and the subtitles). Obviously, the average bit rate in DVD-Video depends on the complexity of the video application, and can be anywhere up to the top limit. In the literature, a bit rate of 4.7 Mbits/sec is generally used along with 133 minutes of high quality video to describe DVD Video performance from a single sided, single layer disc.

See VBR.