International Telemetering Conference Proceedings / October 13-16, 1986 / Riviera Hotel, Las Vegas, Nevada / Predetection recording of spread-spectrum (SS) signals such as GPS transmissions is a desirable objective for both users and developers of equipment designed to receive such signals. (GPS user-equipment development is a lengthy process during which signal simulators are only partially useful.) Upon playback, GPS signals are used by the same or modified receivers so that acquisition, processing, detection and tracking loops can be altered to optimize the receiver parameters. Development of predetect SS signal recording systems is difficult to achieve in practice. Such systems not only must be of suitable phase linearity to preserve the signal content to be extracted but sometimes must also preserve the exact signal-to-noise ratio (SNR) characteristics of the recorded signals. Existing conventional test equipment is unsuitable for deriving value judgments of the quality of a predetect recording system’s output because the SS signal has a negative SNR. This paper reveals that it is possible to use, for this purpose, tape recorders now available on many test ranges in combination with auxiliary equipment similar to that designed for the U.S. Navy’s TRIDENT Program (recording C/A-code data from in-flight missile translators). The basic techniques are described in some detail to enable potential users to understand the necessary equipment concepts and evaluate the author’s approach in terms of their own applications.

Areal densities of perpendicular hard-disk drives over 500Gb/in2 have already been demonstrated, with 1Tb/in2 densities being forecasted in the near future. However, at these high areal densities the information bearing units on the magnetic storage medium are magnetically unstable at temperatures expected in hard-disk drives. To extend or bypass this limit, new developments in head and media technologies and understanding of their record, readout and noise performances are necessary. The aim of this project was to study the record, readout and noise properties of conventional and future perpendicular magnetic recording media, heads and their related technologies. The objectives were therefore to develop a flexible and robust experimental recording platform to test the performance of different heads and media, and develop the necessary readout theory to predict the replay performance. In line with the project objectives, a high-precision open contact recording tester was developed with 1nm resolution. The open nature of this system allows different heads and media combinations to be tested. A second, closed system was also developed based on a commercial perpendicular hard-drive, modified to serve as a spin-stand to provide signal and noise measurements in practical drive conditions. The readout process in perpendicular recording was modelled based on the reciprocity principle for a shielded TMR head to study the parameters that affect the readout signal performance, and for comparison with the experimental measurements. Measured signal roll-off curves showed a practical linear density of 450KFCI for the commercial perpendicular disk medium, and indicated that non-linear effects happen at linear densities approaching 550KFCI. These results were in agreement with the theoretical calculations of the replay process. Two-dimensional readout scans were found have similar or higher resolution than Magnetic Force Microscopy (MFM) images of the same recorded regions – indicating the versatility and precision of the developed contact tester. Inverse filtering employing the Wiener filter was used to extract the magnetic transition. The extracted transition profiles and transition extents from the replay signals had much higher resolution than MFM images measured for the same transition region, thus showing the applicability of the developed testers for in situ magnetic characterisation. The developed contact and non-contact testers allowed the investigation of a new proposed recording scheme, Shingled Magnetic Recording (SMR). Measured signal roll-off curves of shingled tracks indicated a rise in the signal amplitude at low densities. At higher linear densities the signal performance was the same as conventionally written tracks with guardbands. It was found that a 30% reduction in track width in SMR, increase the areal density by a factor of 1.58 above that in existing hard drives.

Wind bands have been recording for over one hundred years. Through advancements in both technology and process, recordings have made a monumental impact on the wind band and its repertoire. These advancements have created clarity regarding the performance practice of pieces and helped to preserve the wind band repertoire. Many early works have gained masterwork status due, in large part, to the fact that recordings have preserved them. The increase in popularity of recording and, in particular, the wind band, warrants an investigation into the various aspects of the process. Additionally, gaining insight from wind band professionals who record will help to evaluate the contributions that recording has made to the education of performers and listeners, the preservation of repertoire and the artistic enhancement of the wind band. Each chapter explores aspects of the recording process and how those aspects have shaped the wind band, its repertoire and performance practice. Information from conductors, composers and engineers provide valuable insight pertaining to the educational, historical and artistic components of the recording process. The goal of all involved in the recording process should be the pursuit of technical perfection, which does not eclipse the ultimate musical goals of the project and the integrity of the composer's intentions.

No description available.

Detta arbete behandlar ämnet trumsound i en studiomiljö och hur jag som trummis kan påverka soundet. Syftet med arbetet är att förstå och utveckla de olika faktorer som tillsammans skapar ett sound och berör bland annat speltekniska områden som timing och dynamik, materiella områden som val av instrument och dess konstruktion samt akustiska områden som mikrofonplacering och rumsakustik.  Efter att ha transkriberat och analyserat trumspelet på sex kända låtar spelade jag in mig själv i en studio där jag med hjälp av tidigare erfarenheter och nya idéer försökte återskapa trumspelet och trumsounden från dessa låtar så långt det bara var möjligt. Bifogat till arbetet finns transkriptioner samt två versioner på varje trumtagning där den ena är utan effekter och den andra är med effekter. Processen i studion dokumenterades i form av anteckningar och med en filmkamera som sedan tillsammans med det inspelade materialet blev underlag för min analys. Resultatet visar att ordentliga förberedelser och god kunskap om sitt instrument skapar förutsättningar för ett bra sound. Genom att välja instrument med passande ljudegenskaper samt ta tid till att stämma och micka upp trummorna noga krävs det mindre tid i efterediteringsarbetet. Eftersom uppfattningen av timing och dynamik är personlig så skapas också förutsättningar för unika sound genom musikerns sätt att tolka och spela musiken. / This study deals with the topic of drum sound in a studio environment and how I, as a drummer, can affect the sound. The purpose of the study is to understand and develop the various factors that together create a sound. The study involves technical areas such as timing and dynamics, material areas such as the choice of instruments and their design as well as the impact of microphone placement and the acoustics in a room. After transcribing and analyzing the drumming of six famous songs, I recorded myself in a studio and by way of previous experiences and new ideas I tried to recreate the drumming and the drum sound of these songs as far as possible. Attached to this study there are transcripts of the drums and two versions on each take where one is without effects and the other is with effects. The process in the studio was documented in the form of notes and a video camera which then became the basis for my analysis together with the recorded material. The result shows that accurate preparation and good knowledge of the instrument is a fundamental condition for a good sound. Choosing instruments with appropriate sound characteristics and taking time to tune and mic the drums makes the mixing phase shorter and easier. Because the perception of timing and dynamics is personal, the conditions for developing a unique sound are also created through the musician's way of interpreting and playing the music. / <p>Inspelningar finns att ladda ned som bilagor till det skriftliga arbetet.</p>

ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada / The F-35 program, known as the Joint Strike Fighter (JSF), is the largest DOD program ever awarded. There are three F-35 variations, each intended to meet the specific needs of the Air Force, Navy, Marine Corps, and Allies. The F-35 Joint Strike Fighter represents the newest advanced military aircraft to make use of Fibre Channel as its primary avionics information transport network. In addition to its use for carrying tactical information systems data, the Fibre Channel network will also transport the real-time digital video used in the cockpit; primarily the pilot's helmet mounted display (HMD) and the high-resolution configurable panoramic cockpit display (PCD). In addition to the fighter's instrumentation configuration for orange wire and avionics data, the aircraft will carry a separate instrumentation package to allow for both the recording and telemetry of either high-resolution Fibre Channel digital video or standard resolution analog video inputs during flight tests. This multiplexer is designed to record cockpit video and audio data, while supporting an option for the test engineer to select up to three out of eight video and audio inputs for real-time telemetry to the ground. This paper describes the architecture of this system, along with the techniques used to reduce the 5 MBps Fibre Channel digital video to a bandwidth acceptable for telemetry.

International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California / The world of instrumentation data recording has traditionally been concerned with recorder performance in terms of bandwidth, data rate, tape speed and recording time, with the apparently unceasing trend to record more and more data. However, while this may remain a valid perspective for data acquisition, the increasing requirement to integrate equipment into computer based environments has resulted in the need for greater emphasis to be applied to such parameters as data control and interfacing when specifying digital data recording systems. This paper addresses these operational issues and describes the practical implementation of a computer friendly digital cassette recorder which provides a common platform for both high rate data acquisition and computer based data analysis.

International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California / A Digital Output Recorder (DOR) system was developed by JAYCOR under contract to Defense Nuclear Agency (DNA) for the recording of high-speed digital data from test hardware exposed to radiation during an Underground Nuclear Test conducted at the Nevada Test Site (NTS) in 1991. Electronics hardware for the system is based on the well-supported Versa Module Europe (VME) bus which has become an industry standard for digital process and control systems. The system collects, identifies, and telemeters the data from several interfaces using the VME bus to a common data collection point above ground. The system was designed with built-in flexibility and expandability to meet digital data recording requirements on future underground tests (UGTs).

International Telemetering Conference Proceedings / October 17-20, 1988 / Riviera Hotel, Las Vegas, Nevada / Digital-based linear-array chart recorders are replacing conventional stylus recorders in telemetry data stations everywhere. They offer advantages in virtually all respects, and are becoming indispensable. But because of the completely different writing method and technology employed, it is difficult to make completely analogous performance comparisons between analog and digital chart recorders. This has led to some confusion when replacing aging stylus recorders is contemplated. Objectives: Establish a set of universal, standardized performance characteristics for digital chart recorders. Introduce appropriate terminology, allowing valid, repeatable comparison of old and new systems.

The thesis explores the use of religious themes and the notion of self-design in contemporary art practice. It argues that art today that addresses religion does so primarily for its rhetorical function: for a recognizable pattern of persuasiveness, which is ultimately defined by its established mechanisms of belief. Furthermore, it suggests that it is through an engagement with this secularized rhetoric that the art viewer today can potentially be provoked to re-create oneself in ones own terms; or, in Richard Rorty's terms, to 'revocabularize'.