Police said the recording was "inaudible", but Hutcheson claimed the recording was audible. For example, a single sudden loud clap sound can make sounds that follow inaudible. DSD uses noise shaping techniques to push quantization noise up to inaudible ultrasonic frequencies. Sounds at those frequencies are inaudible to the human ear. His words are slurred and mostly inaudible during the conversation. Jackson muttered a reply that was inaudible under the noise of the battle. Scipio responds by asking why this sound is inaudible to mortals on earth. Tornadoes also produce identifiable inaudible infrasonic signatures. Victims are treated as though they are completely invisible and inaudible. In lengthy conversations, the battery would run down, rendering the conversation inaudible. The sequence's beginning and end are heard, but the middle is virtually inaudible. Hz, inaudible to the human ear. The watermark is normally inaudible or invisible to the users. The video signal was poor and the audio inaudible. The original version features a subdued rhythm section with almost inaudible drums.