| 摘要 |
<p>A security device and a security system incorporating such a device comprises a portable secure object (3) which includes means for storing e.g. confidential information, means for storing a coded sound signal or a signal indicative thereof, and integral microphone (4), the microphone (4) being adapted for use in generating the coded sound signal during a registration procedure, and subsequently for use in deriving a further coded sound signal for comparison with the generated coded sound signal for subsequent interrogation purposes.</p> |
