---
# System prepended metadata

title: Sound Design BA1 - 2019-10-08
tags: [SD, BA1]

---

###### tags: `BA1` `SD`


# Sound Design BA1 - 2019-10-08

**Introduction to sound perception and acoustic**
* **Physical properties of sound and human perception**
    * Direct sound
    * Reverberation effect (room effect)
        * early reflection
        * late reverberation
* **Perception I**
    1. Casual listening 
        * It requires that the listener hear a sound and from that sound figure out what the cause of the sound is
    3. Semantic listening
        * Message, Language. Refers to a code or a language to interpret a message
    5. Reduced listening
        * Texture of the sound. Referes to the listening of sound without any connotation or cause behind it
* **Perception II**
    * Sound Object
        * Sound unit perceived and listened as a coherent entity in reduced listening, regardless of its cause and its meaning, and qualified by sound criteria (pite rhythm but also frequency contain and shape)
    * Acousmatic listening
        * Listen to the sound without seeing the cause of it
* Physical and perceptive characteristics
    * Physical characteristics (objective)
        * Frequency
            * The variation in the low to high frequency corresponds to an increase of frequency measured in Hz. Frequency is related to the sound wave length
            * wavelength = constant speed / frequenct
            * Low frequenct can keep further 頻率和能量成正比
        * Intensity
        * Harmonic spectrum
    * Physiological characteristics (subjective)
        * Pitch
        * Loudness
        * Timbre 音色
    * Hearing threshold - the threshold of hearing for human
    * Pain threshold - the threshold of hreaing that fucks your ears
    * Hearing capability
    * Sound spectrum - unsually a small sample of a sound - in terms of the amount of vibration
        * Harmonic spectrum - containing only frequenct components
* Between noise & instrumental sound
    * Noise
        * Accumulation of frequencys in non-harmonic relation 多個波形疊加
    * Instrumental sound
        * Main fandamental frequency with harmonic in regular
    * Timbre
        * Amplitude Envelope + frequency distribution (similar to colors) (shape of a wave)
* Temporal characteristics
    * Rhythm
        * Binary / Ternary (四拍 / 三拍)
