IEEE 1394 is a standard for a high performance serial bus interface. It encompasses both isochronous transfer mode, which is suitable for real-time applications, and asynchronous transfer mode, which is appropriate for delay-insensitive applications. This standard can be used as a basis for constructing a small-size local area network. Two queueing models are proposed for a network operating under the IEEE 1394 specification. The average waiting time in steady state of an asynchronous packet is calculated, and the effect on it due to isochronous traffic is studied. Numerical results from both analysis and simulation are presented in order to evaluate the performance of such a system.

IEEE 1394 is a standard for a high performance serial bus interface. It encompasses both isochronous transfer mode, which is suitable for real-time applications, and asynchronous transfer mode, which is appropriate for delay-insensitive applications. This standard can be used as a basis for constructing a small-size local area network. Two queueing models are proposed for a network operating under the IEEE 1394 specification. The average waiting time in steady state of an asynchronous packet is calculated, and the effect on it due to isochronous traffic is studied. Numerical results from both analysis and simulation are presented in order to evaluate the performance of such a system.

musical sequences, and then stored in a data structure. By analyzing the data structure of each musical sequence, the electronic musical instrument also can provide intelligent accompaniment, such as voice leading, to the notes that the operator plays on the keyboard."--DWM 4,951,546 43.75.Tv ELECTRONIC STRINGED MUSICAL INSTRUMENT Youjiro Takabayashi and Takashi Norimatsu, assignors to Yamaha Corporation

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downward into a corresponding groove in the fingerboard. Insert 14, which may be either of plastic or metal, is slidably inserted into groove 13 of the base. The choice of insert material depends upon the type of tone desired, the hardness determining whether or not the "whizz" effect is obtained. In any case, the replacement of frets is said to be easier when the insert is used.--DWM 4,723,471 43.75.Mn KEYBOARD DEVICE4,726,275 43.75.Tv ELECTRONIC MUSICAL INSTRUMENT William A. Aitken, Anthony J. Sedivy, and Michael S. Dixon, assignors to Synthaxe Limited 23 February 1988 (Class 84/1.15); filed in the United Kingdom 30 July 1985This guitarlike electronic musical instrument that operates a synthesizer has conventional strings which the player depresses onto conductive frets to determine the synthesizer tone frequency selected. Guitarists sometimes displace the string laterally across the fret for special effect and occasionally bring the strings into contact with an adjacent string when the action (called bending) is excessive. In the present patent, the synthesizer frequency determination occurs as soon as contact is made between the string and the fret, and a string-bend detection system prevents changing this frequency during the bending action and also prevents spurious effects when inadvertent contact is made with an adjacent string.--DWM Keiji Sugimoto, assignor to Nippon Gakki 9 February 1988 (Class 847439); filed in Japan 18 June 1985 ducer is disclosed.•LB 466