###### 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)