previous week; next week

EBU Tech 3286

Assessment Methods for the Quality of Sound Material – Music

• institution: European Broadcasting Union

• city: Geneva

• year: 1997

material

• classical music

• may also apply to

  • live acoustical performance

  • in a real place

• not apply to

  • mainly electronic in origin

  • speech

  • drama

panel

• 7 seats maximum

• familiar with the subject genre(s)

• fluent in the working language of evaluation

evaluation

• discrete 6-point scale with unequal distance

• subjectively-weighted mean

• reference items

• discussion and comments

  • during or between items: no

  • after each session: yes

ITU-R BS.1387

Method for Objective Measurements of Perceived Audio Quality

• institution: International Telecommunication Union

• city: Geneva

• year: 2001

models

• traditional

  1. Signal-to-Noise Ratio (S/N)

  2. Total Harmonic Distortion (THD)

• issues

  • not relate reliably to perceived audio quality

  • even worse on modern non-linear and non-stationary codecs

• proposed

  1. Disturbance Index (DIX)

  2. Noise-to-Mask Ratio (NMR)

  3. Objective Audio Signal Evaluation (OASE)

  4. Perceptual Audio Quality Measure (PAQM)

  5. Perceptual Evaluation (PERCEVAL)

  6. Perceptual Objective Measure (POM)

  7. The Toolbox Approach

• versions

• • basic: 6 of 8 applications

  • advanced: 6 of 8 applications

• validation

• • Subjective Difference Grade (SDG)

  • Objective Difference Grade (ODG)

  • correlation

  • outliers

  • Absolute Error Score (AES)

ITU-R BS.1284

General Methods for the Subjective Assessment of Sound Quality

• institution: International Telecommunication Union

• city: Geneva

• year: 2003

• replaces ITU-R BS.562

evaluation

• continuous scale with(out) descriptions of anchor points

  • 5-grade: sound quality or impairment assessment

  • 7-grade: comparison test

• recommended resolution of 1 decimal place

• subjectively-weighted mean

• interchange the reference and the sample; repeat

time

• excerpt no longer than 15 to 20 seconds

• session no longer than 15 to 20 minutes

• rest period of the same length at least

ECMA-74

Measurement of Airborne Noise emitted by Information Technology and Telecommunications Equipment

• institution: Ecma International (formerly European Computer Manufacturers Association)

• city: Geneva

• year: 1981–2021

methods for determination of sound power levels of equipment

• in reverberation test rooms

• under essentially free-field conditions over a reflecting plane

• at defined operator and bystander positions

Software

• Brüel & Kjær PULSE Sound Quality Software Type 7698

previous week; next week