Wireless microphone for use with an in-car video system
An in-car video system and method is provided where a wireless microphone is configured with bi-directional communications capability. In response to a received RF activation signal, the wireless microphone is automatically switched on to capture (and transmit back to the in-car video system) an audio soundtrack that accompanies the images captured by the car-mounted video camera. A wireless microphone controller mounted in the car transmits the RF activation signal to the wireless microphone. The wireless microphone controller is arranged to transmit the RF activation signal when the VCR starts recording. In an illustrative embodiment of the invention, the wireless microphone receives information, including a confirmation that the VCR is recording, from an RF information signal received from the wireless microphone controller mounted in the car. The wireless microphone displays the information to the officer on a display screen. The wireless microphone sounds an audible alert when it receives the RF activation or information signals.
1. A remotely activated microphone for use with a vehicle-mounted base station in a vehicle-mounted surveillance system including a video recording device, comprising:
a microphone for capturing audio;
an RF receiver arranged to receive an RF activation signal from the vehicle-mounted base station, the RF activation signal being generated by the base station when an operational status signal indicative that the video recording device is recording is received by the base station from the surveillance system, the RF activation signal switching the microphone into a transmit mode from a standby mode when received; and
an RF transmitter for transmitting the captured audio as an RF data signal.
2. The microphone of claim 1 wherein the microphone, RF transmitter and RF receiver are disposed in a body-wearable housing.
3. The microphone of claim 1 wherein the microphone, RF transmitter and RF receiver are disposed in a housing that is arranged to be removably inserted into a substantially close-fitting holster.
4. The microphone of claim 3 wherein the holster includes a clip for removably attaching the holster to an article of clothing such as a belt.
5. The microphone of claim 1 further including an input couplable to an external microphone.
6. The microphone of claim 5 including a visual display for indicating that the video recording device is recording.
7. The microphone of claim 5 wherein the video recording device is selected from the group consisting of tape recorders, video cassette recorders, hard-disk drives, electronic memory, Flash memory, or optical drives.
8. The microphone of claim 1 wherein the RF transmitter transmits using a digital spread spectrum transmission technique.
9. The microphone of claim 8 wherein the digital spread spectrum transmission technique is selected from the group consisting of frequency hopping or direct sequence.
10. The microphone of claim 1 further including a connector for synchronizing with an external controller to exchange a security code for transmitting the RF data signal as a secure signal.
11. The microphone of claim 10 wherein the security code is a spreading code.
12. The microphone of claim 1 further including an audible alert generator.
13. The microphone of claim 12 wherein the audible alert generator is arranged to generate an alert to indicate the successful exchange of a security code between the microphone and an external controller.
14. The microphone of claim 12 wherein the audible alert generator is arranged to generate an alert to indicate that the microphone has moved out of radio contact range with the vehicle-mounted surveillance system.
15. The microphone of claim 12 wherein the audible alert generator is arranged to generate an alert to indicate that a battery operatively coupled to the microphone arrangement has dropped below a threshold state of charge.
16. A remotely activated microphone for use with a vehicle-mounted base station in a vehicle-mounted video surveillance system including a video recording device, comprising:
a wireless transmitter for transmitting audio captured by a microphone as an RF data signal; and
a controller for activating the wireless transmitter to switch the microphone into a transmit mode from a standby mode in response to a received RF activation signal, the RF activation signal being generated by the base station when an operational status signal indicative that the video recording device is recording is received by the base station from the surveillance system, the RF activation signal being transmitted from the base station to the remotely activated microphone.
17. The microphone of claim 16 further including a battery disposed within a housing that houses the wireless transmitter and the controller.
18. The microphone of claim 16 wherein battery is selected from the group consisting of Ni-CAD batteries, NiMH batteries, LiOn batteries or non-rechargeable batteries.
19. The microphone of claim 16 further including an interface for operatively coupling the battery to an external battery charger.
20. The microphone of claim 16 further including a visual display for indicating a charge level of the battery.
21. A method of operating a wireless microphone used with an in-car video system including a car-mounted camera, a base station, and a video recording device, the method comprising the steps of:
in response to a received RF activation signal that indicates the video recording device is recording, capturing audio with the wireless microphone, the RF activation signal being generated by the base station when an operational status signal indicative that the video recording device is recording is received by the base station from the video recording device, the RF activation signal being transmitted from the base station to the wireless microphone; and
transmitting the captured audio to the video recording device to provide a recordable audio soundtrack corresponding to an image captured by the car-mounted camera.
22. The method of claim 21 including the further step of receiving an RF deactivation signal and deactivating the wireless microphone.
23. The method of claim 21 including the further step of generating an audible alert to indicate that the wireless microphone has moved out of radio range with the in-car video system.
24. The method of claim 21 including the further step of generating an audible alert to indicate that the wireless microphone has a state of battery charge below a threshold.
25. The method of claim 21 including the further step of displaying a visual indication of a state of operation of the video recording device.
26. The method of claim 21 including the further step of displaying a visual indication of a state of battery charge of a battery disposed within the wireless microphone.
27. The method of claim 21 including the further step of synchronizing the wireless microphone with an external base station to exchange a security code between the wireless microphone and base station to enable secure RF transmission between the wireless microphone and the in-car video system.