When "Blackmail" was released in 1929, the film industry was still in its early stages of adapting to the new technology of sound. Hitchcock, known for his experimental approach to filmmaking, seized the opportunity to explore the possibilities of sound in "Blackmail." The film was initially shot as a silent, but during production, the decision was made to adapt it into a "talkie." This transformation allowed Hitchcock to push the boundaries of storytelling, incorporating sound effects, music, and dialogue to create a more immersive experience for the audience.