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This study investigates the impact of time alignment on perceived attributes for drumkit recording techniques within the context of popular music. While previous research has compared time alignment in drum recording, little attention has been paid to the differences it may cause in perceived recording qualities. To address this gap, various overhead microphone configurations were recorded alongside kick and snare microphones to create stimuli for listening tests. These recordings were then processed with and without time alignment, and attributes such as clarity and punch were evaluated by participants using a modified MUSHRA interface. The results consistently favored non-time-aligned techniques in terms of perceived clarity and punch, with statistically significant differences observed in most cases. Preferences between engineers and musicians did not significantly differ. Participants provided both quantitative and qualitative feedback, including preferences for certain techniques and evaluations of clarity, punch, balance, size, and width. Least preferred samples exhibited characteristics such as roominess, phase issues, processed sound, dryness, harshness, muddiness, and undefined qualities. Critiques of the XY configurations included mentions of uneven stereo imaging and unnatural phase correlation, suggesting potential improvements in mic placement.

This thesis work examines how the user experience of mobile games can be evaluated with the use of session recording tools. The thesis project was carried out at the mobile games development company MAG Interactive, and the aim was to produce a workflow for the company with guidelines for how to conduct user testing with session recording tools for mobile devices. In order to evaluate the tools and services, and to develop the workflow, several user tests have been conducted. When using mobile session recording tools, it is possible to record the screen of the device, the microphone input and in some tools also the front camera input while the user is playing the game. Recording the test session makes it easier to understand and evaluate the player experience of the game and also to identify usability issues. The thesis also covers other parts necessary when conducting user testing besides the actual session recording tool. These are test set up (instructions, tasks etc.), integration, distribution of the test and the application and also analysis of the recorded test session.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Telemetry recorders have historically been used as standalone systems with each user responsible for operation and data interpretation on that system. Utilizing the latest peerto- peer networking technologies, telemetry recorders can now be linked to provide instantaneous communication between systems. This fully distributed, network-based architecture can be used for command and control of multiple recorders, as well as message passing between them. A centralized server is no longer required, resulting in considerable logistical and cost savings. The peer-to-peer communication topology can efficiently connect telemetry recorder “islands of information”.

Powerful error-correcting codes have enabled a dramatic increase in the bit density on the recording medium of hard-disk drives (HDDs). Error-correcting codes in magnetic recording require a low-complexity decoder and a code design that delivers a target error-rate performance. This dissertation proposes an error-correcting system based on polar codes incorporating a fast, low-complexity, soft-output decoder and a design that is optimized for error-rate performance in the magnetic recording channel. LDPC codes are the state-of-the-art in HDDs, providing the required error-rate performance on high densities at the cost of increased computational complexity of the decoder. Substantial research in LDPC codes has focused on reducing decoder complexity and has resulted in many variants such as quasi-cyclic and convolutional LDPC codes. Polar codes are a recent and important breakthrough in coding theory, as they achieve capacity on a wide spectrum of channels using a low-complexity successive cancellation decoder. Polar codes make a strong case for magnetic recording, because they have low complexity decoders and adequate finite-length error-rate performance. In their current form, polar codes are not feasible for magnetic recording for two reasons. Firstly, there is no low-complexity soft-output decoder available for polar codes that is required for turbo-based equalization of the magnetic recording channel. The only soft-output decoder available to date is a message passing based belief propagation decoder that has very high computational complexity and is not suitable for practical implementations. Secondly, current polar codes are optimized for the AWGN channel only, and may not perform well under turbo-based detector for ISI channels. This thesis delivers a powerful low-complexity error-correcting system based on polar codes for ISI channels. Specifically, we propose a low-complexity soft-output decoder for polar codes that achieves better error-rate performance than the belief propagation decoder for polar codes while drastically reducing the complexity. We further propose a technique for polar code design over ISI channels that outperform codes for the AWGN channel in terms of error rate under the proposed soft-output decoder.

International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / NATO NAFAG Air Group IV (AG IV) established the NATO Advanced Data Storage Technical Support Team (NADS TST) to investigate the technology and to develop an interface Standardization Agreement (STANAG) for recording, storage, and exchange of imagery data. Government agencies and industry involved in these technologies are participating in this effort.

This practice-based enquiry into United Kingdom based collecting rooms reveals five participants’ motivations, frustrations and satisfactions manifested in the creation of their spaces. Through the examination of theorists and commentators in the distinct but related fields of cultural theory, sociology and art, the thesis proposes that a collector’s past can be witnessed through memories generated by and within the space. The thesis also advances the idea that part of the experience of the space takes place in the present but simultaneously imagines the future. I have constructed spatial portraits using semi-structured interviews, photography and video, which explore the environment of each collector thus gaining insights into individual circumstances and personal situations. Narrative within this enquiry takes three intersecting forms: firstly the account of the construction of each collecting room, which divests objects of their historical origins, replacing these with personal associations or meanings devised by each collector. Secondly, each participants’ re-telling of their narratives and thirdly through the re-presentation of the collectors’ narratives to an audience. The latter brings my agency as an artist into focus. Uniting all three narrative forms, the creative practice intends to produce a metanarrative of each collecting room that further investigates the temporality of the space through the combined use of still photography, video and sound. Constructed from a symbiotic relationship between theory and practice, the research uses a methodology that combines Sensory Ethnography with Interpretive Phenomenological Analysis. This methodology explores the idiosyncrasies of each collector, engendering an extensive investigation of the individual collecting spaces. This detailed approach formed and eventually determined the number of participants, resulting in the production of a developmental case study and four original re-presentations that respond to ideas and debates on collecting, material culture and domestic space. These artworks that have been informed by combining existing research methods and constitute my contribution to new knowledge, disclosing ideas and observations which combine narrative and experience not necessarily discernable from theoretical arguments alone.

International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Recorders conforming to IRIG Standards have served the data recording community well for many years. Initially, most systems were analog in nature, recording data in either direct or FM modes but as the need for digital recording developed, the IRIG recorder was successfully adapted for this purpose by the addition of formatting and coding sub-systems to form the High Density Digital Recorder (HDDR). Today, user requirements for higher speed, higher capacity and more convenient systems have presented equipment designers with new challenges in terms of the correct choice of technology and system architecture. It is not surprising that system designers should turn for inspiration first to the very high speed transverse and helical products which had been developed for the broadcast industry since these technologies possess many of the attributes necessary for a high rate digital data recorder. It is unfortunate that it has now become a truism that the only logical progression from the longitudinal IRIG system is by means of rotary technology. Recent developments in a technology known as micro-track recording now call this assumption into question. Recording systems based on micro-track technology are available and others are in an advanced state of development, and these offer a costeffective, attractive and low risk alternative to rotary systems for both high rate data capture and tape mass storage applications.

International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California / Modern High Density Digital Recorders (HDDR) are ideal devices for the storage of large amounts of digital and/or wideband analog data. Ruggedized versions of these recorders are currently available and are supporting many military and commercial flight test applications. However, in certain cases, the storage format becomes very critical, e.g., when a large number of data types are involved, or when channel-to-channel correlation is critical, or when the original data source must be accurately recreated during post mission analysis. A properly designed storage format will not only preserve data quality, but will yield the maximum storage capacity and record time for any given recorder family or data type. This paper describes a multiplex/demultiplex technique that formats multiple high speed data sources into a single, common format for recording. The method is compatible with many popular commercial recorder standards such as DCRsi, VLDS, and DLT. Types of input data typically include PCM, wideband analog data, video, aircraft data buses, avionics, voice, time code, and many others. The described method preserves tight data correlation with minimal data overhead. The described technique supports full reconstruction of the original input signals during data playback. Output data correlation across channels is preserved for all types of data inputs. Simultaneous real-time data recording and reconstruction are also supported.