Abstract：
:An experimental ultrasonic sonar for use as a sensory aid with blind children is described. Novel signal processing techniques make the aid relatively simple to construct, yet allow many of its parameters to be changed in the field. In particular, the aid has two features, a variable range code and an automatic level control, which make the device very versatile in a wide variety of environments. The ultrasonic tranducers used in the aid are described in some detail.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Boys JT,Strelow ER,Clark GRdoi
10.1016/0041-624x(79)90010-6subject
Has Abstractpub_date
1979-01-01 00:00:00pages
37-42issue
1eissn
0041-624Xissn
1874-9968pii
0041-624X(79)90010-6journal_volume
17pub_type
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