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Speakerphones
Conference Phones and Speakerphones |
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Audio Testing and evaluation of both Digital
and Analog designs.
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Terminal and 4227 Artificial Mouth |
Speakerphone TestingWe can assist you with most aspects of speakerphone work including acoustic testing, writing specifications, dealing with vendor and manufacturing problems, or “bailing out” problematic designs.
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Send and Receive Test Setup
Loudness Directionality
Instability in the Dial Tone Area |
About Speakerphones - HandsfreeSpeakerphones (called Hands-Free Terminals by many standards) are a challenge to a design team. Dozens of interacting variables — electric, acoustic and psychoacoustic — require a delicate balancing act. What seems like a simple concept can be beset with buzzing plastics, voice cutouts, acoustic feedback, echo, and unstable calls.
Some customers prefer a “rich, bassy“ low end while others like a clear intelligible sound. Since these can be conflicting goals, the frequency response must be adjusted carefully in order to satisfy each group.
Stability is essential. The system must handle voice, music and call-progress tones without self-interruption or oscillation. Switching should be smooth and unobtrusive – especially at the onset of an interruption.
Loudspeaker selection is critical. Cost, efficiency, resonant frequency and unit-to-unit consistency are some considerations in loudspeaker selection.
Microphone sensitivity, manufacturing consistency, and proper mounting into the housing are important factors.
The plastics design affects transducer performance of both microphone and loudspeaker and is critical to a successful project. |
Owner, Ron Magnuson, has made extensive contributions to North American
speakerphone
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Frequency Response
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acousticsFC.com |
© Ron Magnuson, Austin, Texas |