A privacy apparatus adds a privacy sound based on a speaker's own voice
into the environment, thereby confusing listeners as to which of the
sounds is the real source. This permits disruption of the ability to
understand the source speech of the user by eliminating segregation cues
that the auditory system uses to interpret speech. The privacy apparatus
minimizes segregation cues. The privacy apparatus is relatively quiet and
thus easily acceptable in a typical open floor design office space. The
privacy apparatus contains an A/D converter that converts the speech into
a digital signal, a DSP that converts the digital signal into a privacy
signal with pre-recorded speech fragments that are summed so that the
speech fragments at least partly overlap one another, a D/A converter
that converts the privacy signal into an output signal and one or more
loudspeakers from which the output signal is emitted.