Patent Application
20070249289
The invention will now be explained in more detail on the basis of the enclosed drawings, which show:
The exemplary embodiments described in greater detail below represent preferred embodiments of the present invention.
According to the example depicted in
The school students with the hearing devices 2, but also with earpieces or headsets as receivers, are located in a classroom. On entering the classroom, the teacher carries his transmitter 1 through a door 3. The transmitter 1 switches on automatically at this point. This is made possible by two directional antennas 4, 5 arranged in the doorposts or in front of or behind the door 3. The two directional antennas 4, 5 are part of a short-range transmitter. Each of the two antennas 4, 5 emits signals in a respective directional beam 6, 7. The fact that the two directional beams 6, 7 are spatially separated from one another means that the transmit device 1 equipped with a microphone can separately establish its passage through the two directional beams 6, 7.
If the two antennas 4, 5 are transmitting with different frequencies or with different signal patterns, the transmitter 1 can also determine the direction in which someone is moving when passing through the doorway. Depending on the direction, the transmitter 1 can then be switched on or off. In the present example this fact can be utilized to switch off the transmitter 1 if the teacher leaves a classroom.
The evaluation intelligence can however also lie in a control apparatus, which uses the two antennas 4, 5 or corresponding transmitters. This control apparatus detects a movement into/out of the classroom for example through reflection or signals from transmitter 1. A control signal sent out subsequently switches the transmit device 1 on or off.
A further exemplary embodiment of the inventive microphone radio system is outlined in
If the teacher with the transmitter 1 leaves classroom A and goes into the corridor in which the transmitter 1 no longer receives radio waves, the transmitter 1 switches itself off automatically. This prevents the teacher's conversations in the corridor being overheard by the students in classroom A.
If the teacher now enters classroom B, in which the antennas 20 and 21 are located, the teacher's transmit device switches on as soon as it comes into the detection range of the associated directional beams 22 and 23. Here too the beams 22 and 23 do not extend into the corridor, so that the teacher's transmit device is switched off automatically on departure from classroom B. The directional beams 12, 13 and 22, 23 in classrooms A and B are also aligned and dimensioned so that no overlapping occurs where possible.
The teacher's transmitter 1 can not only be switched on and off by the beams 6, 7, 12, 13, 22, 23 but can also be configured by them. This means that the transmitter or the microphone radio system is configurable in a location-based manner. In particular the teacher's transmitter 1 can be set automatically to a classroom-specific radio channel setting on entry into the classroom. In another classroom the transmitter automatically sets itself to another radio channel. In this manner too disturbances between radio systems of two adjacent classrooms can be avoided.
If the transmitters belonging to the antennas 4, 5, 10, 11, 20, 21 are also in a position to be able to vary their transmit signal depending on the time, the configuration of the radio system can be made dependent on the time of day for example. In addition transmitters installed in the classroom can also be configured by the receivers for example, if they possess corresponding interfaces.
The configuration of the FM radio system can also relate to the receivers 2. Above and beyond this additional conditions or equipment of a room can be taken into account in the configuration of FM transmitters and/or receivers. This is especially useful if the data is transmitted digitally.
If a loudspeaker system is also installed in a classroom for example, the teacher's speech signal will also be switched to the loudspeaker. The radio receivers on the students' hearing devices can then remain switched off if necessary.
In this exemplary embodiment too the antennas 10, 11, 20, 21 can be part of a control apparatus, with the antennas initially being used to detect a transmit device 1 and subsequently to transmit a corresponding control signal to the transmit device 1.
If there is more than one transmitter in the room, this is detected automatically by one of the transmit devices or by the control apparatus with detection device as soon as the relevant persons enter the room. The second transmitter added is then automatically mixed with the existing transmitter. To this end the transmitter 1 receives the signal from transmitter 2, adds the signal to its own signal and transmits it to the students. This means that at least the first transmitter must then also be equipped with a receiver. This multi-transmitter mode enables two or more teachers to speak simultaneously over the radio system to the students.
Instead of a further teacher a video or stereo system can also serve as an additional transmitter for example and thus be integrated into the teaching. The students can then hear all sources via their FM receivers.
Antennas 10, 11 in classroom A can be placed so that a precise determination of the location of transmitter 1 or of the teacher in classroom A is possible. This additionally obtained location information is used where necessary to transmit location-specific signals from the antennas 10, 11. With these control signals the transmitter 1 can then be configured on a location-specific basis. For example the transmit signal amplitudes of the transmitter 1 are then able to be varied depending on the location in the events room. Other location-dependent configuration options relate to noise suppression measures and filtering.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2006 018 155.7 | Apr 2006 | DE | national |
