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Printacall logo. text: 'Products.'Picture of a Lexis wireless FM communication systemone handset with the Ameriphone PA25 Telephone Ampli

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Lexis wireless FM communication system
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Lexis wireless FM communication system

Description:

Lexis is a wireless FM personal communication system for use with BTE hearing insruments. During conversation, Lexis helps overcome the listening challenges created by noise, distance, and echo. It also attaches easily to other sound sources (TV, stereo, computer, etc.).

Application:

The Lexis system has two components: a hand-held transmitter/microphone and an ear-level FM receiver. The directional transmitter/microphone provides 8.5 AI-DI, when set in the superfocus mode, to enhance understanding in noisy and reverberant conditions. By using digital signal processing (DSP), it is able to focus in on the desired sound (e.g., speech). The ear-level receiver connects to most hearing instruments via an audio shoe. It works with most FM narrow-band transmitters operating on the same frequency and has a sensitivity control trimmer. While FM is in the OFF position it does not drain the battery, so the receiver can remain attached and ready to use.

Transmitter/microphone

Specifications:

dimensions (WXHXD)
  125 x 20 x 35 mm
weight
  75g

power supply

 

  2 x 1.2V NiMH rechargeable batteries AAA
2 x 1.5V disposable Alkaline batteries AAA
6.5VDC charger 100 - 240V (60/50 Hz)

battery life

  8+hrs (10 hrs with disposable AAA)
operating frequencies (model-dependent)
  173, 183 and 216 MHz
maximum frequency deviation
  5kHz
rf power output
  5mW (216MHz); 2mW (173 & 183 MHz)
channel selection
  unit preprogrammed selection by pen-push butons
type of modulation
  FM
processing
  Digital Audio Processing
range

  up to 10m with internal antenna
up to 30m with external antenna
SNR*
  >50dB
audio bandwidth

  100Hz - 6.5kHz delivered from system to hearing instrument
minimum channel spacing
  50kHz
external audio

  input (mini-jack) 3.5mm stereo walkman type 200mV rms max.
distortion
  <1.5%

Receiver

Specifications:

dimensions (WXHXD)
  15.2 x 12.4 x 11.3 mm
power supply
  from hearing instrument battery
standby
  no drain

battery current drain-on battery current drain-off

  2.0mA (1.2V)
no drain
operating frequencies (model-dependent)
  173, 183 and 216 MHz
channel selection
  fixed-crystal based
type of modulation
  FM
antenna
  internal antenna
HA power range
  0.95 - 1.6V
audio bandwidth

  100Hz - 6.5kHz delivered from system to hearing instrument
total harmonic distortion*
  <1%
SNR*
  >55dB
adjacent channel rejection
  >45dB at 50kHz channel spacing


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Printacall Communications Technology, 2 Doig Avenue, Denistone East, NSW 2112, Australia
Ph: (61 2) 9809 2392, Fax: (61 2) 9809 2345, Email: sales@printacall.com.au
Copyright © 2000, Printacall Communications Technology.
Product specifications and/or availability may change without prior notice.

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