Software Modification Prevents Interference
IRVINE, CA - The CDMA Development Group (CDG) today announced
that it has completed the initial specification of a feature
that will allow hearing aid wearers to use existing Code Division
Multiple Access (CDMA) phones. This feature can be programmed
into CDMA handsets and requires no modification to existing
hearing aids. With the new feature users can be assured they
will not experience interference to their hearing aids when
using CDMA phones.
The CDG's approach applies only to CDMA technology because
CDMA phones can operate in a continuous mode without turning
the transmitted radio power on and off hundreds of times per
second. Further, CDMA operates at substantially lower peak
power levels compared to other technologies. CDMA is proving
to be an excellent technology for resolving this issue in
The CDG has been actively working on industry-wide testing
efforts in conjunction with the Cellular Telephone Industry
Association (CTIA), the Personal Communications Industry Association
(PCIA) and the University of Oklahoma. The CDG intends to
make its approach available for review by hearing aid manufacturers
and other associations working on behalf of the hearing impaired.
"As a hearing aid user, I am very pleased to have contributed
to the CDG's effort to address this issue," said Dan
Crews, a member of the CDG hearing aid compatibility team.
"The CDG has devised a very simple approach that will
work for all CDMA handsets. It is important to me that we
not interfere with the devices currently in use by more than
four million existing hearing aid wearers."
"Finding a way to eliminate interference will be important
to the commercial success of any digital cellular or PCS technology,"
said Evan Richards, vice president, engineering, Ameritech
Cellular Services. "CDMA technology is the wave of the
future and it is important that it is available to all of
our customers. Fortunately, through the efforts of the CDG
we have developed a simple approach to eliminate interference
for CDMA systems that is easily implementable through software
and will not impact our commercial rollout."
The CDMA Development Group is a nonprofit trade association
which was formed to foster the worldwide development, implementation
and use of CDMA. Recognized around the world as the governing
CDMA MoU, the CDG currently represents over 42 companies including
many of the world's largest wireless operators and equipment
manufacturers. Directors of the CDG are senior officers and
executives of member organizations.
The CDG's primary activities include technical development
of features and services, public relations, education and
seminars, regulatory affairs and international development.
Since its inception in 1994, CDG members have completed several
significant projects which have greatly facilitated the introduction
of CDMA to the wireless market. Currently, there are more
than 400 individuals working within various CDG subcommittees
on CDMA related matters.