Method for utilizing a wireless connection to unlock an opening

1. A method of operating a lock for a door from a portable remote device comprising:

providing a lock controller having an antenna for receiving radio frequency signals, a microphone for receiving sound frequency signals, a microprocessor for processing a radio frequency identification signal received by the antenna and a sound frequency identification signal received by the microphone to determine if the signals emanate from an authorized user of the lock, and a device driver controllable by the microprocessor for operating the lock;

sending a radio frequency identification signal from the portable remote device to the lock controller;

receiving the radio frequency identification signal at the lock controller and using the microprocessor to determine whether the remote device is an authorized user of the lock;

if the remote device is identified as an authorized user of the lock, sending a radio frequency signal from the lock controller to the remote device specifying a frequency, duration, and/or amplitude of the sound frequency identification signal to be sent from the portable remote device;

subsequently sending the specified sound frequency identification signal from the portable remote device to the lock controller;

receiving the sound frequency identification signal at the lock controller and using the microprocessor to determine whether the remote device is an authorized user of the lock;

if the remote device is identified as an authorized user of the lock from both the radio frequency identification signal and the sound frequency identification signal, sending an authorization signal from the processor to the device driver authorizing unlocking of the lock; and

after unlocking the door, deactivating operation of the lock in accordance with the radio or sound frequency identification signal.

2. The method of claim 1 wherein the portable remote device is a mobile telephone and the radio frequency identification signal is a Bluetooth signal.

3. The method of claim 1 wherein the portable remote device includes a speaker, and including sending the sound frequency identification signal from the speaker.

4. The method of claim 1 wherein the lock controls access to an area secured by a physical barrier, and determining a side of the barrier from which the sound frequency identification signal is sent from the portable remote device.

5. The method of claim 4 further including authorizing operation of the lock only if the sound frequency identification signal is sent from the portable remote device from a desired side of the barrier.

6. The method of claim 4 further including a sound frequency detection device on each side of the barrier operatively connected to the controller, and including attempting to detect the sound frequency identification signal with both sound frequency detection devices to determine the side of the barrier from which the sound frequency identification signal is sent.

7. The method of claim 6 wherein operation of the lock is authorized only if the sound frequency identification signal is first detected from a sound frequency detection device on the desired side of the barrier.

8. The method of claim 1 wherein the radio frequency identification signal is initially sent from the portable remote device and received by the controller at a first distance from the lock, and further including, after initially sending the radio frequency identification signal, moving the remote device toward the lock, and wherein the sound frequency identification signal from the portable remote device is received by the controller at a second distance from the lock closer than the first distance.

9. The method of claim 1 wherein the lock controls access to an area secured by the door, and further including operating the lock to unlock the door.

10. The method of claim 9 further including deactivating operation of the lock in accordance with the radio or sound frequency identification signal unless the portable remote device is moving toward the lock.

11. The method of claim 1 further including a sound frequency detection device in the vicinity of the door and operatively connected to the controller, the sound frequency detection device receiving the sound frequency identification signal from the portable remote device.

12. The method of claim 1 wherein the sound frequency identification signal is provided in a frequency above 20,000 Hz or inaudible to most humans.

13. The method of claim 1 wherein the sound frequency identification signal is received at the lock controller from the portable remote device at a distance closer than the radio frequency identification signal is received at the lock controller.

14. The method of claim 1 wherein, after receiving the radio frequency identification signal and identifying the remote device as an authorized user of the lock, the lock controller sends a radio frequency signal to the remote device specifying the sound frequency identification signal to be sent from the portable remote device, and wherein the portable remote device subsequently sends the specified sound frequency identification signal to the lock controller.

15. The method of claim 1 wherein the radio frequency identification signal and sound frequency identification signal are digitally coded.

16. The method of claim 1 wherein a sound frequency identification signal is sent from the portable remote device to the lock controller only if the portable remote device is moving.

17. The method of claim 1 further including additional validation by radio frequency identification signal and/or sound frequency identification signal before authorizing operation of the lock.