Difference between revisions of "Chavin"

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('''Team Information''')
('''Team Information''')
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* Digital waveguide techniques were pioneered at CCRMA by Julius O. Smith III
 
* Digital waveguide techniques were pioneered at CCRMA by Julius O. Smith III
 
* Julius O. Smith and Jonathan S. Abel have been working together on acoustic array processing and related problems since 1985
 
* Julius O. Smith and Jonathan S. Abel have been working together on acoustic array processing and related problems since 1985
* Patty Huang is a graduate student working under Abel on physical modeling of reverberant spaces
+
* Patty Huang is a PhD student working under Abel on physical modeling and analysis of reverberant spaces
* Miriam Kolar is a graduate student with extensive field experience in recording engineering
+
* Miriam Kolar is a PhD student with extensive field experience in recording engineering
 
* John Chowning is a composer having long standing interest in spatial modeling
 
* John Chowning is a composer having long standing interest in spatial modeling
 
* CCRMA has expertise in field measurements, psychoacoustics, digital signal processing, and artificial reverberation
 
* CCRMA has expertise in field measurements, psychoacoustics, digital signal processing, and artificial reverberation

Revision as of 21:27, 3 February 2008

Chavín de Huántar Archaeological Acoustics Project

Acoustic Measurement, Archiving, Analysis and Modeling, and Simulation/Installation

Team Information

Co-investigators:

  • John Rick, PhD, Professor, Stanford University, Archaeology/Anthropology
  • Julius O. Smith, PhD, Professor, Stanford University, Center for Computer Research in Music and Acoustics (CCRMA)/Electrical Engineering (by courtesy)
  • Jonathan S. Abel, PhD, Consulting Professor, Stanford University, CCRMA
  • Patty Huang, MA, Graduate Student, Stanford University, CCRMA
  • Miriam Kolar, MFA, Graduate Student, Stanford University, CCRMA

Coordinator:

  • John Chowning, DMA, Professor Emeritus, Stanford University, CCRMA/Music

Local collaborators:

  • (Museum director)

Team Background:

  • John Rick has been heading excavations and directing research at the Chavín site since 1995
  • Digital waveguide techniques were pioneered at CCRMA by Julius O. Smith III
  • Julius O. Smith and Jonathan S. Abel have been working together on acoustic array processing and related problems since 1985
  • Patty Huang is a PhD student working under Abel on physical modeling and analysis of reverberant spaces
  • Miriam Kolar is a PhD student with extensive field experience in recording engineering
  • John Chowning is a composer having long standing interest in spatial modeling
  • CCRMA has expertise in field measurements, psychoacoustics, digital signal processing, and artificial reverberation

Phase 1. Preparation and on-site measurements

Preparation

  • Preliminary on-site tests [completed 12/07]
  • Specification of test and recording equipment [completed 1/08]
  • Purchase and assemble gear

Simulation Trials in local environments

  • CCRMA stairwell, hallways, “Pit”
  • SU subsurface spaces-“famous” steam tunnels
  • Outdoor space similar to Chavín Circular Plaza?

Specify provisional mapping for sound source-receiver placements from CAD rendering [in progress 1/08]

  • from each chamber to main space
  • least damaged areas
  • with and without plastering
  • peculiar geometries (e.g. , adjoining (comb-like) chambers, etc)

On site measurements at Chavín

  • Plastering of section of Chavín (selection of plastered sections is critical (soon after arrival to allow for drying)
  • Adjust mapping of source-receiver points

Measurements -- sources

  • balloon pops
  • speaker-generated sinusoidal chirps
  • other signals
  • strombus trumpet live/recorded
  • record stream/water sound, wind noise

Measurements -- receivers

  • distributed mics
  • in-ear-canal mics

Costs

  • $5000 equipment (link to gear and price list)
  • $8000 travel and accommodations (2 weeks on site) for 2 faculty (Rick, Abel), 2 graduates students (Huang, Kolar)
  • $1000 on site plastering and removal

Funding

  • National Geographic [1]
  • Stanford Institute for Creativity in the Arts (SICA) [2]

Phase 2. Analysis and Generation of Physical Model

Analysis

  • compare plastered and unplastered and extrapolate to the entire structure
  • IR measurement to render the modeled spaces
  • measurement processing to model the pristine state
  • Strombus trumpet

Physical Model

  • calculate acoustical properties of materials
  • rendering from architectural models
  • use waveguide mesh processing
  • Stanford invention of and current work with waveguide mesh allows effective method to address computation/simulation of acoustical spaces
  • process and match/fit measurements then extend to parts of site that aren't necessarily intact or accessible for comprehensive measurements (plastering).

Costs

Funding Sources

  • National Geographic [3]
  • National Endowment for the Humanities- Collaborative Research Grants [4]
  • National Science Foundation- Archaeology and Archaeometry [5]

Phase 3. Electroacoustic simulation & Public interface

Locations

  • Stanford
  • Chavín Museum
  • Quantify and compensate for support structures
  • Simulation of plastered walls
  • National Museum Peru

Equipment

Public interface

  • virtual walkthrough (headphone tour) in present condition
  • virtual walkthrough (headphone tour) in reconstructed condition
  • enhanced reverberation system for visitor experience
  • installations of replica in various formats (online, DVD, museum, show, etc.)