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Publications

User preference on artificial reverberation and delay time parameters

Publication . Pestana, Pedro D.; Reiss, Joshua D.; Barbosa, Álvaro

It is a common belief that settings of artificial reverb and delay time in music production are strongly linked to musical tempo and related factors. But this relationship, if in existence, is not yet understood. We present the results of two subjective tests that evaluate user preference of young adults with formal training in audio engineering on artificial reverb and delay time, while trying to relate choice to tempo and other low-level explaining factors. Results show there is a conclusive relationship between musical tempo and delay time preference as described by users. Reverb time setting preference, however, cannot be explained in such a strong manner. In this latter aspect the present work has nevertheless uncovered some ideas on how to proceed in order to quantify the phenomenon.

2017Journal article

Restricted access

Design and implementation of a new run-time life-cycle for interactive public display applications

Publication . Cardoso, Jorge C. S.; Perpétua, Alice

Public display systems are becoming increasingly complex. They are moving from passive closed systems to open interactive systems that are able to accommodate applications from several independent sources. This shift needs to be accompanied by a more flexible and powerful application management. In this paper, we propose a run-time life-cycle model for interactive public display applications that addresses several shortcomings of current display systems. Our model allows applications to load their resources before they are displayed, enables the system to quickly pause and resume applications, provides strategies for applications to transition and terminate gracefully by requesting additional time to finish the presentation of content, allows applications to save their state before being destroyed and gives applications the opportunity to request and relinquish display time. We have implemented our model as a Google Chrome extension that allows any computer with the Google Chrome browser to become a public display driver without further software. In this paper we present our model, implementation, and evaluation of the system.

2015Conference object

Open access

The Leap Motion Movement for 2D Pointing Tasks: Characterisation and Comparison to Other Devices

Publication . Seixas, Manuel; Cardoso, Jorge C. S.; Dias, Maria Teresa Galvão

In this paper we present the results from an experiment designed to characterize the Leap Motion movement in 2D pointing tasks and compare it to a mouse and touchpad. We used the ISO 9241-9 multi-directional tapping test for comparing the devices, and we analyse the results using standard throughput and error rate measures as well as additional accuracy measures such as target re-entry, task axis crossing, movement direction change, orthogonal direction change, movement variability, movement offset, and movement error. We also present the results from the ISO9241-9 assessment of comfort questionnaire, and our observations from the participant’s postures when using the Leap Motion device. Results indicate that the Leap Motion performs poorly in these tasks when compared to a mouse or touchpad.

2015Conference object

Open access

One hand or two hands? 2D selection tasks with the leap motion device

Publication . Seixas, Manuel; Cardoso, Jorge C. S.; Dias, Maria Teresa Galvão

In this paper, we present the results from an experiment designed to compare two selection gestures (hand grab and screen tap) for the Leap Motion controller in 2D pointing tasks. We used the ISO 9241-9 multi-directional tapping test for comparing the devices, and we analyze the results using standard throughput and error rate measures as well as additional accuracy measures. We also present the results from the ISO 9241-9 assessment of comfort questionnaire. To complement this analysis, the computer mouse was also evaluated in order to serve as a comparison. Results indicate that the hand grab gesture performs better than the screen tap.

2015Conference object

Open access

User preference on artificial reverberation and delay time parameters with applications to automatic multitrack mixing

Publication . Pestana, Pedro Duarte; Reiss, Joshua D.; Barbosa, Álvaro

In this work we present the results of two subjective tests that strive to evaluate user preference on artificial reverb and delay time, while trying to relate choice to musical tempo and other low-level explaining factors. The need to understand and explain these options through common practice arises from the lack of grounding that is needed to establish a mapping of musical features to audio control parameters. This mapping is crucial for the development of intelligent production systems, namely automatic audio mixers, which has been trending over the last few years. Results show there is a conclusive relationship between musical tempo and delay time preference as described by users, but are unsatisfactory in explaining reverb time settings. In this latter aspect this work has, however, uncovered some hints on how to proceed in order to quantify the phenomenon.

2016Journal article

Restricted access