Tor Halmrast

• Halmrast, Tor (2018). Attack the Attack. Proceedings of the Institute of Acoustics.  ISSN 1478-6095.  40(3), s 335- 346 Show summary

  When listening to musicians playing the same pieces of music in different acoustic settings in Stavanger concert hall, the perceived differences were astonishing. However, the measured overall changes in spectrum, level etc., were surprisingly small. Long reverberation of course increases the length of a tone, so that it masks the entrance of the next one, but probably most astonishing was the perceived difference in timbre due to changes of the attack, (also for a first note in a phrase). The paper will discuss general theory of how an “ideal, diffuse field reverberation” influences on attack. The early response of a concert hall, is, however, seldom “diffuse”. The paper will show measurements and simulations (Odeon) of attack with/without early reflections. Methods for measuring attack in concert halls is not as trivial as measuring Rise Time, Steepness etc. for ordinary electronic filters, and alternative approaches like Integrated (Cumulative) Squared Step Response and Spectral Flux is discussed. The importance of attack has been little discussed in concert hall design, but should be more and more important, also because listeners nowadays are used to listening to recordings where any wanted amount of direct sound is mixed with a long and (too?) smooth, non-correlated, (digital) reverberation. It is generally assumed that a fast attack is more brilliant, sounds more like if there are more high frequencies present than a “fade in”. First we must remember that a signal of course preserves it attack best if we just hear the direct sound only. This paper will show how reverberation always smoothens/prolongs the attack and discuss how this affects signals of different lengths, different musical instruments which in itself have slow or fast onset of note, and if it is possible to reduce the smoothening of the attack by early reflections.

• Halmrast, Tor (2017). ACOUSTICS IN BETWEEN: PERCEPTION OF SOUND IN ROOMS BEYOND STANDARD CRITERIA. Proceedings of the Institute of Acoustics.  ISSN 1478-6095.  6, s 4177- 4184
• Halmrast, Tor (2017). ANALYSIS OF MUSIC PERFORMED IN DIFFERENT ACOUSTIC SETTINGS IN STAVANGER CONCERT HALL. Proceedings of the Institute of Acoustics.  ISSN 1478-6095.  6, s 4169- 4176
• Halmrast, Tor (2015). Flutter echoes: Timbre and possible use as sound effect. Proceedings of the International Conference on Digital Audio Effects.  ISSN 2413-6700.  2015 . doi: http://www.ntnu.edu/documents/1001201110/1266017954/DAFx-15_submission_39.pdf/2797340b-6616-4b68-b32e-a824a6e8e632
• Halmrast, Tor (2015). Perception of Sound in Rooms Beyond Standard Criteria. Psychomusicology: Music, Mind & Brain.  ISSN 0275-3987.  25(3), s 256- 271 . doi: 10.1037/pmu0000077
• Halmrast, Tor (2015). Why do flutter echoes "always" end up around 1-2 kHz?. Proceedings of the Institute of Acoustics.  ISSN 1478-6095.  37(3), s 395- 408
• Halmrast, Tor (2014). "Acoustics in Between". Psychomusicology: Music, Mind & Brain.  ISSN 0275-3987.
• Halmrast, Tor (2014). "Musician's Timbre and Strength in (too) small Rooms". Forum Acusticum.  ISSN 2221-3767.
• Halmrast, Tor (2014). Musician's perceived timbre and strength in (too) small rooms. Forum Acusticum.  ISSN 2221-3767.  2014(January)
• Halmrast, Tor (2014). "When Source is also Receiver". Building Acoustics.  ISSN 1351-010X.  20(4), s 403- 421
• Halmrast, Tor; Guettler, Knut; Bader, Rolf & Godøy, Rolf Inge (2010). Gesture and Timbre, In Rolf Inge Godøy & Marc Leman (ed.),  Musical Gestures: Sound, Movement, and Meaning.  Routledge.  ISBN 978-0-415-99887-1.  Chapter 8.  s 183 - 211
• Halmrast, Tor (2000). "Orchestral Timbre: Comb Filter Coloration from Reflections". Journal of Sound and Vibration 231(1)p.53-69. Journal of Sound and Vibration.  ISSN 0022-460X.  232(1), s 53- 69
• Halmrast, Tor (2000). Parergon (Tidsskrift for Ny Musikk)"Lyden er en sinke". Parergon.  ISSN 0313-6221.

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• Halmrast, Tor (2010). Opera-akustikkens historie. Opera Publishing, Oslo.  ISBN 978_82-92845-04-2.  5 s.

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• Halmrast, Tor (2019). A VERY SIMPLE WAY TO SIMULATE THE TIMBRE OF FLUTTER ECHOES IN SPATIAL AUDIO.
• Halmrast, Tor (2019). Cepstrum for Rhythm Detection.
• Halmrast, Tor (2019). FLUTR.
• Halmrast, Tor (2019). FLUTR for 24 ch Audio (4 quadro + 20 Ambisonics loudspeakers). Show summary

  For info: http://tor.halmrast.no/ICM2019Halmrast_Flutter.m4v

• Halmrast, Tor (2019). Oslo I Smug-trioen.
• Halmrast, Tor (2019). Reverberation Influences the Attack.
• Halmrast, Tor (2019). THE TIMBRE OF FLUTTER ECHOES, AND THE COMPOSITION “FLUTR”. Show summary

  Video: http://tor.halmrast.no/ICM2019Halmrast_Flutter.m4v

• Halmrast, Tor (2019). Timbre and Duration of Attack Depend on the Amount of Reverberation.
• Halmrast, Tor (2018). Akustikk for Pianostemmere.
• Halmrast, Tor (2018). Basstanker i små rom.
• Halmrast, Tor (2018). Div. Komposisjone: "Jeg Ser", "Bytrærne".
• Halmrast, Tor (2018). Sound Theory for Master Students, Electroacoustic Music, Norges Musikkhøgskole.
• Halmrast, Tor (2017). Kjellerband Blues for Storband.
• Halmrast, Tor (2017). Sam Phillips´ Slap BAck Echo; Happily in Mono.
• Halmrast, Tor (2017). Slap Back Echo.
• Halmrast, Tor (2017). Sound Theory for Master.
• Halmrast, Tor (2017). TØMMERMENN musikal. Show summary

  Urframført 20170908, Glenghuset, Sarpsborg. Forestillinger også 20170909 og 21071016 etc.

• Halmrast, Tor (2016). Analyse av musikk framført i forskjellige akustiske innstillinger i Stavanger Konserthus.
• Halmrast, Tor (2016). Aqueduct.
• Halmrast, Tor (2016). Aqueduct framført Paris.
• Halmrast, Tor (2016). Room shape Music. Music shapes Rooms.
• Halmrast, Tor (2015). “AKUSTISK FORSKNING, i(nni) mellom”.
• Halmrast, Tor (2015). How Musicians adapt to the Room. TIMBRE and Strength in Music Rehearsal.
• Halmrast, Tor (2015). "Jeg Ser" for tenor og ensemble (tekst: Obstfelder).
• Halmrast, Tor (2015). "KLANGEN".
• Halmrast, Tor (2015). TIMBRE.
• Halmrast, Tor (2014). "En antikvarisk korrekt absorbent".
• Halmrast, Tor (2014). "Musician´s perceived Timbre and Strength in (too) small Rooms".
• Halmrast, Tor (2014). "Tør Du?" (tekst A.Prøysen).
• Halmrast, Tor (2014). "When Source is also Receiver2".
• Halmrast, Tor (2013). ETTAN/TO´AN for storband.Urframføring april 2013 Tr.h.
• Halmrast, Tor (2013). Norsk Standard "Akustikk i Musikkrom" Arbeidsgruppe.
• Halmrast, Tor (2012). Bylyder Foredrag (Lydlandskap).
• Halmrast, Tor (2012). Historien om Kammertonen.
• Halmrast, Tor (2012). Musikkakustikk for Noroff.
• Halmrast, Tor (2012). Some Projects in Scandinavia ISBN 978-87-995400-0-6.
• Halmrast, Tor (2012). The History of Standard Tuning Frequency. ISO Focus+.  ISSN 2226-1095.  3(10), s 25- 27
• Halmrast, Tor (2011). Listen to the listed.
• Halmrast, Tor (2011). More Combs. Forum Acusticum 2011, ISSN 2221-3767. Show summary

  Further investigation on Combfilter coloration from close reflection, for musical timbre and echolocalization.

• Halmrast, Tor (2011). "T60" Symposium Heldag Musikkakustikk Initiativtaker.
• Halmrast, Tor (2008). Auditoria in Norway.
• Halmrast, Tor (2008). Musikkakustikk for komponiststudenter.
• Halmrast, Tor (2008). "Simplified Room Acoustic Measurements" (with Anders Buen).
• Halmrast, Tor (2007). Akustikk for Interiørarkitekter.
• Halmrast, Tor (2007). Opera Acoustics. A short Story.
• Halmrast, Tor (2007). The Acoustics of a Quarry. Who needs an Acoustician?.
• Halmrast, Tor (2006). Coloration due to Reflections. Further investigations.
• Halmrast, Tor (2006). Projects in Scandinavia I.
• Halmrast, Tor (2006). Sound and Art Installations: Close your ears!.
• Halmrast, Tor (2006). Teaching Acoustics at the University of Oslo, Musicology.
• Halmrast, Tor (2004). Kommite for Norsk Standard: Akustikk i bygninger.
• Halmrast, Tor (2004). Romakustikk i Musikkrom.
• Halmrast, Tor (2004). Sound Coloration from Reflections.
• Halmrast, Tor (2003). Akustikk i Musikkrom.
• Halmrast, Tor (2003). Ich hab´noch einen koffer in Berlin (m/J.Rudi og I.Frounberg).
• Halmrast, Tor (2003). The Illusion of a Constant (electroacoustics).
• Halmrast, Tor (2002). "Coloration" Computer Music Conference.
• Halmrast, Tor (2002). "MAgma"-festival, Berlin. Elektroakustisk musikk.
• Halmrast, Tor (2002). "Varang" framført ved Synthese Festival, Frankrike.
• Halmrast, Tor (2001). "Sound Coloration from (very) early Reflections". Acoustical Society of America.
• Halmrast, Tor (2001). "String Quartet" Interaktiv lydinstallasjon. (m/I.L.Søholt). Ultima, Kulturkirken Jacob.
• Halmrast, Tor (2001). "The Delayed Phantom of the Opera" (om akustikken i Munchen-operaen). Int. Congress on Acoustics, Rome.
• Halmrast, Tor (2001). "The Illusion of a Constant" elektroakustikk. Bourges Festival, Frankrike, Ultima.
• Halmrast, Tor (2000). CD-utgivelse "Alfa og Romeo" Hemera/Norsk Komponistforening.
• Halmrast, Tor (2000, 02. juli). "Sjefen for de gode lyder" Dagbladet 2/7-2000.  Dagbladet.
• Halmrast, Tor (2000). "Slik skal man sikre akustikken i Bjørvika". Aftenposten 27/3-2000. Aftenposten (morgenutg. : trykt utg.).  ISSN 0804-3116.
• Halmrast, Tor (2000). UiO Matematikk. Gjesteforeleser. "MAtematikken i Musikken".
• Halmrast, Tor (2000). Verdensutstillingen EXPO2000 Hannover. Lydteknikk-ansvarlig (Marianne Heske).
• Halmrast, Tor (1999). "Akustikk i Musikkrom". Seminar Akershus Fylkeskommune.
• Halmrast, Tor (1999). "Alfa og Romeo" Vinner av EBU Prix Italy, Assisi, Italia.
• Halmrast, Tor (1999). Brecht/Eisler 100år Cinemateket. Arrangør av musikken, for Oslo Nye Ensemble.
• Halmrast, Tor (1999). "Concrete Music" elektroakustikk. Ultima, Bourges-Festivalen/Frankrike.
• Halmrast, Tor (1999). Foredrag Nordisk Teaterteknisk Forening. Podie-/Scene-akustikk.
• Halmrast, Tor (1999). Jury for Norsk Kulturråds konkurranse: "Virtuell virkelighet og tradisjonelle kunstneriske utrykksformer".
• Halmrast, Tor (1999). "Measurements of Orchestra Acoustics. How reflecting Surfaces influence Klangfarbe and the Possibility of Playing in Time". Acoustical Society of America.
• Halmrast, Tor (1999). "Musical Timbre. Comfilter-Coloration from Reflections" DAFX-99.
• Halmrast, Tor (1999). "Simultaneous measurements of room acoustic parameters using diffenrent measuring equipment" Acoustical Society of America.
• Halmrast, Tor (1999). "The Influence of Modest Scattering/Diffusing Acoustical Treatments on Coloration/"Box-Klangfarbe" in corridor". University of Salford (UK).
• Halmrast, Tor (1998). NMH Gjesteforelesning: "Akustikk for Komponist-studenter".
• Halmrast, Tor (1998). NTNU Akustikk Gjesteforeleser 1998.
• Halmrast, Tor (1998). Prosjekteringsanvisning for Auditorier med lydanlegg.
• Halmrast, Tor (1998). "Simultaneous measurements of room-acoustic parameters using diffenrent measuring equipment". (w/A.Chr.Gade and B.Winsvold") Journal of Acoustical Society of America.
• Halmrast, Tor (1998). Undervisning NISS (Norsk Lydskole). "Akustikk i Musikkrom" 1år.
• Halmrast, Tor (1997). Gjesteforeleser Inst. for Industridesign.
• Halmrast, Tor (1997). "Trollslottet". Lydinstallasjon til skulptur Frognesæteren (V.Sand) 16 kanalals avspilling av elektroakstisk musikk med distribuert høyttalerplassering i is-skulpturer/"telt".
• Halmrast, Tor (1996). "ALFA og ROMEO" RadiOpera. sopran, alt, tenor. Kringkastingsorkesteret (Chr. Eggen), elektroakustikk. NRK. Vinner European Broadcasting Union (EBU) Prix Italia. CD. (tekst: T.R.Pedersen).

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