Daniel E Robertson

US Patent:

6792112, Sep 14, 2004

Filed:

Mar 17, 2000

Appl. No.:

09/528236

Inventors:

Lowell Campbell - Calisbad CA
Daniel Robertson - Encinitas CA

Assignee:

DENSO Corporation - Kariya

International Classification:

H04N 7167

US Classification:

380270, 713 37, 713255

Abstract:

A wireless mobile unit includes a voice encoder circuit that receives an analog voice signal and creates digital voice data representing a users voice. The mobile unit receives an encryption key entered by the user, typically on the keypad or through a voice recognition circuit, and stores the encryption key in a storage device. An encryption circuit encrypts the digital voice data using the encryption key. A transmitter then modulates the encrypted voice data onto an RF signal and transmits the RF signal to a base station in a wireless network. The base station uses the same encryption key to decrypt the signal before transmitting it to another base station or mobile unit. Signals transmitted from the base station to the mobile unit are encrypted and decrypted using a user-selected encryption key in a similar manner.

US Patent:

6212496, Apr 3, 2001

Filed:

Oct 13, 1998

Appl. No.:

9/170988

Inventors:

Lowell Campbell - Carlsbad CA
Daniel Robertson - Encinitas CA

Assignee:

Denso Corporation, Ltd.

International Classification:

G10L 2102
H04R 2500

US Classification:

704221

Abstract:

Methods and apparatus implementing a technique for producing an audio output customized to a listener's hearing impairment through a digital telephone. A user initially sets user parameters to represent the user's hearing spectrum. In receiving a call, the digital telephone receives an input signal. The digital telephone adjusts the input signal according to the user parameters and generates an output signal based upon the adjusted input signal.