1.
General Information
The
wireless earphone combined with antenna connected to a sound system would
increase mobility and privacy to users. We would discuss other applications
using similar method in the following sections
2.
Marketing Analysis
This
system would be sold to all users using a sound system such as
·
Music listeners, TV users
·
Technical support personnel
·
Car alarm system
·
Cordless phone or ear phone
3.
Product Analysis
3.1
System Overview
There
are wireless earphones and cordless phones in the market that have interference
problems, e.g. a user uses a wireless earphone listen to music might hear
unwanted sound/message/music coming from a neighbouring wireless sound system.
To eliminate this problem, we may want to encrypt voice data before sending it
on the air from a sound system to the wireless earphones.
3.2
Voice Encryption
If
we planned to use voice encryption method and CAVE algorithm designed for
cellular telephony, cost of each earphone would be very high. The processing
power of each earphone is also slow. Therefore, it is recommended to use in
cordless phone handset.
Assuming
that user is only listening to music from his sound system, but he is not
concerned with eavesdropping. Thus, the earphones will only focus on decoding
voice data sent from his sound system, but ignoring data sending over the air
by other sound system. The same principle applies to his sound system.
3.3
Implementation Proposal
Encoding/digitizing
voice data and adding some pre-defined (product) identification code at the
beginning of each voice message frame. This unique code must be stored in both
sound system (cordless phone, music receiver, etc.) relayed via the antenna as
well as the earphone. Therefore, the antenna and earphones will only accept and
decode messages which convey the same predefined identification code.
A
manufacturer would set the product identification code in both devices. It may
contain
·
Serial number
·
Manufacture code allocated to each manufacturer
·
Model number
The
diagram above illustrates how system would add and remove identification code.
It must be implemented on both sound system and ear phones.
(a)
When interference detected either the earphone or radio-based antenna system
will order changing frequency of transmitted carrying waves.
(b)
The receiving unit will perform verification on identification code, parity
bits, frame alignment bits, etc. to ensure quality of the receiving messages.
4.
Other applications
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