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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
The goal of MPEG-4 is to establish a universal and efficient coding for different forms of audio-visual data, called audio-visual objects. Coding tools for audio-visual objects are being developed to support various functionalities, such as object-based interactivity and scalability. The syntax of the audio-visual objects is being developed to allow for description of coded objects and to describe how they were coded. This information can then be down loaded into a decoder.
MPEG-4 is expected to be available by the year 2000.
Industry:Software
A standard for compressing moving pictures. MPEG uses the similarity between frames to create a sequence of I, B, and P frames. Only the I frame contains all the picture data. The B and P frames only contain information relating to changes since the last I frame. MPEG-1 uses a data rate of 1.2 Mbps, the speed of CD-ROM. MPEG-2 supports much higher quality with a data rate (also called bit rate) of from 1.2 to 15 Mbps. MPEG-2 is the format most favored for video on demand, DVD, and is the format for transmitting digital television.
Industry:Software
Also referred to as Studio MPEG, Professional MPEG, and 442P@ML. Sony’s Betacam SX is based on MPEG 4:2:2.
Industry:Software
The ability to cut into an MPEG bitstream for switching and editing, regardless of frame types (I, B, P).
Industry:Software
A commonly used term for the MPEG-1 Layer 3 (ISO/IEC 11172-3) or MPEG-2 Layer 3 (ISO/IEC 13818-3) audio compression formats. MPEG-1 Layer 3 is up to two channels of audio and MPEG-2 Layer 3 is up to 5.1 channels of audio. MP3 is not the same as MPEG-3.
Industry:Software
MPEG-7 is a multimedia content (images, graphics, 3D models, audio, speech, video) representation standard for information searching.
Final specification is expected in the year 2000.
Industry:Software
MHEG is another working group under the same ISO/IEC subcommittee that feature the MPEG. The MHEG is the Working Group 12 (WG 12) of Subcommittee 29 (SC 29) of the joint ISO and IEC Technical Committee 1 (JTC 1). The ISO/IEC standards produced have number 13522. MHEG targets coding of multimedia and hypermedia information, and defines an interchange format for composite multimedia contents. The defined MHEG format encapsulates a multimedia document, so to speak, as communication takes place in a specific data structure. Despite the talk about multimedia, there is not very much said and written about MHEG, which seems odd given the realm of MHEG. The present market significance of MHEG is very low, probably due to the high number of proprietary standards for audio visual representation in multimedia PC environments.
Industry:Software
A family of three versions of an ATV transmission scheme said to be both receiver-compatible and channel-compatible. Since the original MUSE schemes are neither, there is little similarity between them, other than the use of sub-sampling. The differences between the three versions relate to how the wide aspect ratio is handled and what techniques are used for augmentation in an ATV set. Two versions of MUSE-6 use the letterbox technique for aspect ratio accommodation and both of these use blanking stuffing in the expanded VBI area for vertical resolution enhancement.
The differences between the two versions relate to the duration of the sub-sampling sequence (one frame or two). The third uses the truncation technique for aspect ratio accommodation, sending the side panels stuffed into the existing VBI and HBI. Additional horizontal detail is transmitted via two-frame sub-sampling.
Industry:Software
A family of three versions of an ATV transmission scheme said to be receiver-compatible and using a 3 MHz augmentation channel. The three versions are very similar to the three versions of MUSE-6, except that the version using the truncation method sends the wide-screen panels on the augmentation channel rather than stuffing them into the HBI and the VBI. There are two classes of the three versions of MUSE-9, one with a contiguous augmentation channel and one without. The one without is said to be somewhat inferior in quality to the one with.
Industry:Software
MUSE optimized for emission (i.e., broadcasting) rather than transmission (i.e., satellite distribution). It is a non-receiver-compatible, non-channel-compatible scheme occupying 8.1 MHz of base bandwidth and requiring four fields to build up a full-resolution picture. Thus, it requires motion compensation (and retains some motion artifacts). It offers four channels of high-quality digital audio. It has been tested in the Washington, DC area.
Industry:Software
