Audio transmission protection apparatus
Authentication system between a card reader and a pay card excha
Authenticator code generator
Authenticator device for precluding compensating text modificati
Autofocus circuit for a videodisc playback device
Autokey code generator
Autokey generator for secret communication system
Automated positioning
Automatic black level setting circuit
Automatic brightness control circuit
Automatic coordinate determining device
Automatic coordinate determining device having electrostatic shi
Automatic data synchronizer
Automatic DC restorer and gain control
Automatic defect-detecting method and apparatus
Automatic delay compensator
Automatic fine tuning defeat circuit
Automatic focusing apparatus
Automatic frequency control device for television receiver
Automatic frequency control of voltage variable capacitor tuned