Works

To Philipp Kolb

01 - Virtual Mirror 02 - Sound Mirror 03 - Imaginary Mirror 04 - Memory Mirror

Instrumentation (detailed)

Soloists	Trumpet in C (Tam-Tam),
Electronic / Electroacoustic	Electroacoustics

Performer(s)

The idea that gave birth to Klangspiegel (Sound Mirror) is precisely the sound reflection of certain acoustic characteristics of the trumpet on the tape. The microscopic look of the internal life of a sound, through which we are possessed by a certain reality of the object, allows their projection throughout the perceptible domain. Fourier analysis (FFT) is the tool that we have to go through this passage from the microscopic time to the musical time. The amplitude/frequency pairs resulting from the five trumpet sounds of the FFT analysis are transformed by means of a set of algorithms (amplitude and frequency filters). The former instrumental re-synthesis inverts the role of object and reflected image. Apart from the analysis of purely spectral data, there is also the observation of the time evolution of the 13 first partials of the trumpet, from which it is extracted a certain order, the "Gestalt". Applying this shape to a set of pitches and extracting the quartertones in their specific time relation to the rest, results in a particular rhythmic proportion. Therefore, the obtained rhythm is a consequence of the melodic shape that was achieved with the "Gestalt" and the set of pitches. The out coming rhythm is used as an archetype with various tone-combinations. With the development of the compositional work, the idea of reflection has expanded to other aspects. The idea took the form of a temporal mirror, meaning, the reflection at the time axis of an entire section, emerging in the form of a summary. This can happen during long-lasting periods of time, or in the note-to-note domain; it can reflect the part immediately after or already passed sections, or it can be a summary of a parameter only - as for instance the rhythm - or of several parameters simultaneously. Luís A. Pena

Work	Type	Date	Organization/Event	Venue	Town	Country	Performers	Notes	Inv Row
Klangspiegel	Premiere	2002/Jul/16	Aveiro-Síntese Festival	Aveiro Art and Congress Centre	Aveiro	Portugal	Philipp Kolb (trumpet) Luís Pena (sound projection)	Notes

Documents
	Type (+ sub-type)	Cover/edition title Document title	Authors	Referring to	Publisher	Date
	Audio	[sem título]		klangspiegel Luís Antunes Pena
	Audio	EAW 2015 First International Congress of Electroacoustic Music Aveiro . Portugal  Luís Antunes Pena . Klangspiegel . I. Virtual Mirror . II. Sound Mirror		klangspiegel Luís Antunes Pena	capella	2015 2015
	Audio	EAW 2015 First International Congress of Electroacoustic Music Aveiro . Portugal  Luís Antunes Pena . Klangspiegel . III. Imaginary Mirror		klangspiegel Luís Antunes Pena	capella	2015 2015
	Audio	EAW 2015 First International Congress of Electroacoustic Music Aveiro . Portugal  Luís Antunes Pena . Klangspiegel . IV. Memory Mirror		klangspiegel Luís Antunes Pena	capella	2015 2015
	Radio programmes	Música Hoje 50 - Novos CD com música portuguesa de arte e de pesquisa		klangspiegel Luís Antunes Pena		2015