Matching Items (7)
Filtering by
- All Subjects: Solo
- Creators: Rogers, Rodney
- Creators: Chakraborty, Bijeta
- Member of: ASU Electronic Theses and Dissertations
- Status: Published
Description
Efficiency of components is an ever increasing area of importance to portable applications, where a finite battery means finite operating time. Higher efficiency devices need to be designed that don't compromise on the performance that the consumer has come to expect. Class D amplifiers deliver on the goal of increased efficiency, but at the cost of distortion. Class AB amplifiers have low efficiency, but high linearity. By modulating the supply voltage of a Class AB amplifier to make a Class H amplifier, the efficiency can increase while still maintaining the Class AB level of linearity. A 92dB Power Supply Rejection Ratio (PSRR) Class AB amplifier and a Class H amplifier were designed in a 0.24um process for portable audio applications. Using a multiphase buck converter increased the efficiency of the Class H amplifier while still maintaining a fast response time to respond to audio frequencies. The Class H amplifier had an efficiency above the Class AB amplifier by 5-7% from 5-30mW of output power without affecting the total harmonic distortion (THD) at the design specifications. The Class H amplifier design met all design specifications and showed performance comparable to the designed Class AB amplifier across 1kHz-20kHz and 0.01mW-30mW. The Class H design was able to output 30mW into 16Ohms without any increase in THD. This design shows that Class H amplifiers merit more research into their potential for increasing efficiency of audio amplifiers and that even simple designs can give significant increases in efficiency without compromising linearity.
ContributorsPeterson, Cory (Author) / Bakkaloglu, Bertan (Thesis advisor) / Barnaby, Hugh (Committee member) / Kiaei, Sayfe (Committee member) / Arizona State University (Publisher)
Created2013
Description
The two solo violin works by Carl Nielsen (1865-1931) have been largely overlooked since their composition in the 1920s. These pieces are representative of Nielsen's mature style, combining elements of classical form (the Theme and Variations) as well as processes more commonly found in the twentieth century (through-composition and non-tonal harmonic language). This paper is designed to bring these long-neglected works to light and make them more approachable for violin students, teachers and performers. As Denmark's leading composer, Nielsen was well regarded in his lifetime, although his isolation from mainland Europe created obstacles in his path toward international fame. Rather than following trends in post-romantic music, he remained true to his own musical ideals. This choice often isolated him further during his career, but his unique blend of chromatic harmony, driving rhythms and juxtapositions of character captivates modern listeners. Although small in scope compared to his symphonies and other large works, the enthusiastic spirit and indomitable energy of the solo violin works reflect Nielsen's character at its best. Combining a high level of virtuosity with solid structural integrity, textural variety and musical interest, these works deserve a much more prominent place in the standard violin repertoire.
ContributorsVallier, Michelle Mitchell (Author) / McLin, Katherine (Thesis advisor) / Rogers, Rodney (Committee member) / Jiang, Danwen (Committee member) / Bailey, Wayne (Committee member) / Landschoot, Thomas (Committee member) / Arizona State University (Publisher)
Created2012
Description
Class D Amplifiers are widely used in portable systems such as mobile phones to achieve high efficiency. The demands of portable electronics for low power consumption to extend battery life and reduce heat dissipation mandate efficient, high-performance audio amplifiers. The high efficiency of Class D amplifiers (CDAs) makes them particularly attractive for portable applications. The Digital class D amplifier is an interesting solution to increase the efficiency of embedded systems. However, this solution is not good enough in terms of PWM stage linearity and power supply rejection. An efficient control is needed to correct the error sources in order to get a high fidelity sound quality in the whole audio range of frequencies. A fundamental analysis on various error sources due to non idealities in the power stage have been discussed here with key focus on Power supply perturbations driving the Power stage of a Class D Audio Amplifier. Two types of closed loop Digital Class D architecture for PSRR improvement have been proposed and modeled. Double sided uniform sampling modulation has been used. One of the architecture uses feedback around the power stage and the second architecture uses feedback into digital domain. Simulation & experimental results confirm that the closed loop PSRR & PS-IMD improve by around 30-40 dB and 25 dB respectively.
ContributorsChakraborty, Bijeta (Author) / Bakkaloglu, Bertan (Thesis advisor) / Garrity, Douglas (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2012
Description
Born in 1937, the Ukrainian-Russian composer Nikolai Kapustin has gradually gained recognition among Western music scholars and pianists by blending American jazz idioms into classical forms, such as concertos, sonatas, and preludes; recently he has become a very prominent composer. As one of the most prolific composers of the twentieth and twenty-first centuries, he has composed over 160 works to date. Most of them are piano solo works. The uniqueness of his compositional philosophy is that he consistently treats the music language of jazz as a core element in all his output, while others might only use jazz idioms experimentally in their works.
Being an excellent pianist himself, Kapustin has recorded many of his own works, giving a firsthand reference for interpreting his piano music. Some of his most famous works, including the Variations, Op. 41, the Eight Concert Etudes, Op. 40, and the 24 Preludes in Jazz Style, Op. 53 have been recorded by other prominent artists, such as Steven Osborne and Marc-Andre Hamelin.
Scholarly research on Kapustin’s piano works remains limited. Most of it is found in journal articles and dissertations. Unfortunately, all of them are focused on his early popular works. His more recent works from 2007-2013: the Six Little Pieces, Op. 133, Dialogue, Op. 148, Etude Courte mais Transcendante pour piano, Op. 149, Nobody Is Perfect, Op. 151, A Pianist In Jeopardy, Op. 152, and Wandering, Op. 153, have not yet been discussed in any scholarly writing.
In brief, the purpose of this study is to present a first recording of these six major solo works, and to examine them in a research paper. The paper discusses Kapustin’s consistent use of jazz elements in his recent works, addresses musical and technical concerns in their performance practice, and facilitates more extended study of these valuable but yet to be recorded works.
The paper consists of eight parts. The first part covers brief background information on the composer, as well as reviewing important jazz features, in order to more effectively analyze his stylistic language in the six compositions which are explored in the subsequent chapters including a conclusion.
Being an excellent pianist himself, Kapustin has recorded many of his own works, giving a firsthand reference for interpreting his piano music. Some of his most famous works, including the Variations, Op. 41, the Eight Concert Etudes, Op. 40, and the 24 Preludes in Jazz Style, Op. 53 have been recorded by other prominent artists, such as Steven Osborne and Marc-Andre Hamelin.
Scholarly research on Kapustin’s piano works remains limited. Most of it is found in journal articles and dissertations. Unfortunately, all of them are focused on his early popular works. His more recent works from 2007-2013: the Six Little Pieces, Op. 133, Dialogue, Op. 148, Etude Courte mais Transcendante pour piano, Op. 149, Nobody Is Perfect, Op. 151, A Pianist In Jeopardy, Op. 152, and Wandering, Op. 153, have not yet been discussed in any scholarly writing.
In brief, the purpose of this study is to present a first recording of these six major solo works, and to examine them in a research paper. The paper discusses Kapustin’s consistent use of jazz elements in his recent works, addresses musical and technical concerns in their performance practice, and facilitates more extended study of these valuable but yet to be recorded works.
The paper consists of eight parts. The first part covers brief background information on the composer, as well as reviewing important jazz features, in order to more effectively analyze his stylistic language in the six compositions which are explored in the subsequent chapters including a conclusion.
ContributorsYe, Qingqing (Author) / Cosand, Walter (Thesis advisor) / Hamilton, Robert (Committee member) / Rogers, Rodney (Committee member) / Arizona State University (Publisher)
Created2018
Description
Despite the growth of technology in music composition and performance, professional clarinetists maintain that air microphones are superior to piezoelectric pickups. Pickups offer increased mobility, isolation, and reduced feedback, but air microphones are used simply for the perceived sound quality. In this study a ported barrel pickup and a contact transducer pickup placed at various intervals on the clarinet were sampled and compared to a reference recording to determine how the sound differed for each method. In addition, the history of wind instrument pickups, the acoustics of the clarinet, and the basics of piezoelectricity were discussed to help examine the results. The pickups were examined in three ways: overall level in decibels, frequency cutoff, and overtone displacement. Through these results it was determined that the most accurate methods of clarinet pickup are the ported barrel pickup, contact transducers closer to the vibration of the reed such as the ligature or barrel surface, or a transducer placed at the end of the bell. These findings were consistent with the discussions regarding history, clarinet acoustics, and piezoelectricity. This study also produced a reference for the sounds associated with different pickup methods, as well as possible improvements for clarinet pickup design.
ContributorsEnglert, Patrick William (Author) / Spring, Robert S (Thesis advisor) / Gardner, Joshua T (Thesis advisor) / Caslor, Jason (Committee member) / Rogers, Rodney (Committee member) / Arizona State University (Publisher)
Created2018
Description
This document is comprised of an arrangement and recording of Giuseppe Tartini’s “Devil’s Trill” Sonata for solo violin, and includes historical background, an exploration of Italian ornamentation, and a structural analysis. The original work was written for violin and basso continuo. The author was inspired to create this arrangement for solo violin based on accounts that Tartini liked to perform this work unaccompanied.
The first three chapters focus on events from Tartini’s early life that influenced his compositional style. Chapters four and five provide an overview of Italian ornamentation, and explore five documents that were used to support decisions in creating the arrangement: Giovanni Luca Conforto’s The Joy of Ornamentation; Giuseppe Tartini’s Traité des Agréments de la Musique; Letter to Signora Maddalena Lombardini; Regole; and L’Arte dell Arco. Chapter six provides a structural analysis of the Sonata. The appendices illustrate the process of creating the arrangement.
The arrangement takes into consideration the composite of the original solo and basso continuo parts. In addition, a set of realized ornaments is provided on an ossia staff. The recording includes both the primary arrangement, presented in each initial section, as well as the realized ornaments, presented in each repeated section.
The first three chapters focus on events from Tartini’s early life that influenced his compositional style. Chapters four and five provide an overview of Italian ornamentation, and explore five documents that were used to support decisions in creating the arrangement: Giovanni Luca Conforto’s The Joy of Ornamentation; Giuseppe Tartini’s Traité des Agréments de la Musique; Letter to Signora Maddalena Lombardini; Regole; and L’Arte dell Arco. Chapter six provides a structural analysis of the Sonata. The appendices illustrate the process of creating the arrangement.
The arrangement takes into consideration the composite of the original solo and basso continuo parts. In addition, a set of realized ornaments is provided on an ossia staff. The recording includes both the primary arrangement, presented in each initial section, as well as the realized ornaments, presented in each repeated section.
Contributorsda Cruz Ribeiro e Rodrigues, Christiano E (Author) / Swartz, Jonathan (Thesis advisor) / Buck, Nancy (Committee member) / Rogers, Rodney (Committee member) / Arizona State University (Publisher)
Created2019
Description
This fifteen-minute cyclical mass uses excerpts from the text of the Mass Ordinary and is laid out into five movements and across three different languages: Kyrie (Latin), Gloria (Chinese), Credo (English), Sanctus (Chinese), and Agnus Dei (Latin). Rather than following the tradition of celebrating devotion, this mass tells the story of the abuse of power in political and religious leadership. Movements sung in Latin represent the devout Christian base whose motives and inspiration remain pure and divine. The English movement, Credo, has been altered from the original and represents the manipulation and distortion of scripture, truth, and facts by self-serving leaders and politicians. Finally, Chinese movements represent those who are persecuted for their convictions and their identity.
The turmoil of the Chinese movements is characterized by atonality and fast tempos with contrasting, meditative, lyrical B sections. The outer Latin movements contain the familiar Kyrie and Agnus Dei texts in triple canon with the orchestra. The English middle movement is simultaneously familiar and awkward, with harmonies that almost function, under an altered Credo text. After an aria-like passage, the orchestra takes the “I believe” figure and manipulates it in a modal fugato, culminating in a climactic version of the main motive. A repeated double-dotted quarter note—sixteenth-note rhythm followed by a fast tremolo in the castanets make up the central “bangu motive.” This motive is derived from traditional Beijing Opera, in which the bangu is the principal percussion element. As a rhythmic motive, fragments of it appear in every movement and in several different instrument groups. These fragments undergo various transformations before a version of it arrives as the final Agnus Dei rhythmic figure.
The turmoil of the Chinese movements is characterized by atonality and fast tempos with contrasting, meditative, lyrical B sections. The outer Latin movements contain the familiar Kyrie and Agnus Dei texts in triple canon with the orchestra. The English middle movement is simultaneously familiar and awkward, with harmonies that almost function, under an altered Credo text. After an aria-like passage, the orchestra takes the “I believe” figure and manipulates it in a modal fugato, culminating in a climactic version of the main motive. A repeated double-dotted quarter note—sixteenth-note rhythm followed by a fast tremolo in the castanets make up the central “bangu motive.” This motive is derived from traditional Beijing Opera, in which the bangu is the principal percussion element. As a rhythmic motive, fragments of it appear in every movement and in several different instrument groups. These fragments undergo various transformations before a version of it arrives as the final Agnus Dei rhythmic figure.
ContributorsXu, Eric (Author) / Rogers, Rodney (Thesis advisor) / Suzuki, Kotoka (Committee member) / Meyer, Jeffery (Committee member) / Arizona State University (Publisher)
Created2018