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Yamaha Technology

  • Adaptive echo canceller
  • Arrayed microphones
  • Acoustic design

Yamaha Technology -3

Acoustic design

Acoustically engineered structural design



Sound design features

Structural design based on acoustic engineering
The Projectphone was designed with acoustic engineering principles in mind to achieve clear, easily audible voice pickup and reproduction specialized for conferences. The arrayed microphones are arranged based on hole mountin according to the frequency characteristics of the human voice. The design also reconciles outer appearance with sound, such as by orienting the speakers to direct the best part of the sound toward the human ear.
HiFi speakers
Using carefully selected high performance speakers for HiFi audio, the Projectphone offers clearly audible sound along with superb audio quality for non-conferencing uses.
Speaker arrangement

The PJP-100H, PJP-100UH, and PJP-50R control small-diameter HiFi speakers to produce a point audio source, and adopt an acoustic design that accounts for the conference table and locations of participants. It produces clearly-audible output using a horn loading effect created by the speakers' synthesized acoustic wavefront. The PJP-25UR is also packed with ingenious solutions that target the best sound towards people's ears, such as with the closely-placed small-diameter speakers that project sound outward horizontally.


Divide mode

  • PJP-100H
  • PJP-50R


Clearly audible multilocation conferences without crossing
During multilocation conferences, voices can be reproduced from different speakers according to the locations of the talkers. Outputs without crossing not only make voices easily audible, but also enable easy identification of the location of the current talker.
  • • World's first 3-channel echo canceller
  • • Voices are positioned and reproduced according to the locations of the talkers to ensure clear audio output without crossing, even during multipoint conferences.
  • * Only available when connecting a PJP-100H/PJP-50R with a mesh connection.

Talker position reproduction

  • PJP-50R


The microphone array's talker detection function and the speaker array's virtual sound source generation function combine to facilitate the "talker position reproduction mode" that modifies audio output according to the seating arrangement of the callers. Sound is output at different positions making it easy to distinguish between multiple voices (up to three talkers per location over a two-location IP conference).



  • Adaptive echo canceller
  • Arrayed microphones
  • Acoustic design

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