Space

Acoustics, Silence And The Frequency Spectrum

This deck follows Tim Harrison, Sound Design for Film, ch. 11.

Reverberation is a dense wash of reflections that decay together. An echo is a discrete repeat you can count. They are different tools.
Recording distance is a design choice: a close mic sounds dry and intimate, while a pulled-back mic captures early reflections and gives a sound scale.
Citizen Kane, later in this deck, is the worked example: the reverb stays even when the characters speak close, because the distance between them is emotional rather than physical.

Spectral masking: sounds that occupy the same frequency range obscure each other, and resolving those collisions is much of a re-recording mixer’s job.
The design use runs the other way: highs carry definition and air, lows carry physical weight, and layering across the spectrum is how a single effect gets big.
Come and See, two slides ahead, is the payoff: the mix removes entire bands to put us inside Flyora’s damaged hearing.

Silence in film is engineered, and it is the product of contrast and preparation.
The pre-delay trick: a single frame of true silence before a huge impact makes the impact read louder. Oppenheimer’s Trinity scene, later in this deck, is the extreme case, where physics supplies the silence.
Susan Sontag, quoted in the chapter: “Silence remains, inescapably, a form of speech.”
Elizabeth Weis observes that Hitchcock attached silence to ruthlessness and moral paralysis, using it as a negative moral motif.

Setting: Large hall creates a sense of vastness and emotional distance
Reverberation: Voice echoes emphasize separation
Emotional Impact: Reverberation persists even up close, reinforcing relational tension

Concept: Worldizing through repeated recording in the same space
Process: Recording playback to capture room’s acoustic properties
Outcome: Speech transforms into a “droning mush,” capturing the room’s sound identity