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- Creators: Ryan, Russell
- Creators: Bakkaloglu, Bertan
Description
An investigation of phase noise in amplifier and voltage-controller oscillator (VCO) circuits was conducted to show that active direct-current (DC) bias techniques exhibit lower phase noise performance than traditional resistive DC bias techniques. Low-frequency high-gain amplifiers like those found in audio applications exhibit much better 1/f phase noise performance and can be used to bias amplifier or VCO circuits that work at much higher frequencies to reduce the phase modulation caused by higher frequency devices. An improvement in single-side-band (SSB) phase noise of 15 dB at offset frequencies less than 50 KHz was simulated and measured. Residual phase noise of an actively biased amplifier also exhibited significant noise improvements when compared to an equivalent resistive biased amplifier.
ContributorsBaldwin, Jeremy Bart (Author) / Aberle, James T., 1961- (Thesis advisor) / Bakkaloglu, Bertan (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2010
Description
Every collaborative pianist encounters unrealistic and unsuccessful piano reductions of orchestral and operatic compositions on a regular basis. In some cases, the reductions were realized by the composers themselves, and therefore may contain all the notes from the full score, but might not be realistic piano reductions. Other times, the reductions may have been made by an editor who might arrange the piano part according to their own physical abilities, experience, or taste, but might ignore essential elements of the original orchestration. Alexander Glazunov’s Concerto for Violin and Orchestra, Op. 82 is frequently performed by students and professional violinists alike. The existing piano reduction of the concerto was written by the composer himself. However, the reduction has various issues that make performing this composition challenging for pianists. The main purpose of this paper is not the simplification of the existing reduction, but the creation of a new reduction that is more pianistic and approachable, yet more true to Glazunov’s dynamic and expressive orchestration. The first chapter of this project is an introduction to and comparison of currently available editions. An overview of the composer’s biography and the historical background of the composition comprise the second chapter. Chapters three, four and five are dedicated to each respective movement of the concerto, with explanations and details about certain editorial decisions. The appendix features a new piano reduction of Glazunov’s Violin Concerto in its entirety.
ContributorsKim, Olga (Author) / Campbell, Andrew (Thesis advisor) / Ryan, Russell (Committee member) / Schmelz, Peter (Committee member) / Arizona State University (Publisher)
Created2019
Description
The process of learning orchestra reductions on the piano is rather different from learning a piece originally written for the piano. Even though Dvořák’s Concerto for Cello and Orchestra in b minor is among the most performed works for cello and orchestra, and has been transcribed carefully by both the composer and other editors, the existing piano reductions are not always representative of many important aspects of the original orchestral score. Some reductions have large portions with unplayable or uncomfortable passages for pianists, or imprecise notations compared to the original orchestration, such as inaccurate indications for dynamics, rhythms, and notes. In rehearsal and performance, the pianist is challenged to adapt and transform one of the existing reductions into a playable and productive piano reduction, one which creates Dvořák’s full orchestral sonorities while retaining clarity of voicing. The resulting sound can be infinite in variety, as individual decisions and reductions may differ greatly. This paper will explore the following: how to reduce this orchestral score and solve the technical problem involved in orchestral writing for piano while effectively producing the sound of the orchestra in the piano reduction. There will be a literature review on important published reductions and a brief history of the work and composer. While it is not possible to discuss in detail each passage that has been revised or altered, this paper will focus on and analyze representative and substantial passages, including the perspective of two different reductions: Bärenreiter (2011) and Bärenreiter Praha (2004). It will provide a detailed demonstration of each example and will make suggestions for changes which will concentrate on capturing the essence of the orchestral score at the piano. Chapter one introduces and presents current editions. Chapters two, three and four will discuss each movement of the concerto with detailed explanations about changes in certain passages and sections. The appendix will feature a new revised reduction of Dvořák’s Cello concerto in B minor.
ContributorsKim, Hyewon (Author) / Campbell, Andrew (Thesis advisor) / Norton, Kay (Committee member) / Ryan, Russell (Committee member) / Arizona State University (Publisher)
Created2020