Abstract: A method for wireless digital radio communication is put into effect on a first number K of channels between a second number A of users. All A of the users are permitted to listen on one and the same listening channel. A limited number B of channels is used for outgoing speech communication. The communication on these channels is transmitted to all A users on the listening channel. A communication apparatus which utilises this method includes at least one stationary base unit (1) and at least A handsets (2).

Abstract: A method for limiting the sound volume in an earphone, a headset (8), or the like, to a maximum permitted level, entails that an input signal (2) is sensed by a processor (4) and damped by a damper (6) if it is excessively high. Thereafter, the signal (7) is transmitted to the earphone, the headset (8), or the like. The processor (4) switches between an active mode and a rest mode. An apparatus for limiting the sound volume according to the method includes a microprocessor (4) and a damper (6).

Abstract: A method of limiting the maximum permitted sound volume in an earphone, a headset or the like, includes the step that the size of the driving signal for driving the earphone is sensed. The driving signal has a voltage that is less than approx. 0.7 V. If the driving signal exceeds a certain level, a part of the driving signal is shunted past the earphone. A second part of the driving signal is diverted. Either the voltage of the diverted part is increased and controls the shunt device by which the first part of the driving signal is shunted past the earphone, or it is supplied to a unit with a detector device and the shunt device. The unit is sensitive to work at voltages below approx. 0.7 V. An earphone or the like for the above-mentioned method comprises a shunt device and a detector device whose current source is the signal source of the earphone.

Abstract: A radiation sensor device (20) for detection of radiation. A sensor device with an array of radiation sensitive elements (24) forming a sensor surface (26) is provided. The device comprises a number of circuit boards (21), each with a row of radiation sensitive elements, such as X-ray sensitive charge collectors, provided at the edge portion. The radiation sensitive elements are each connected to signal processing means (28), e.g. ASICs with amplifiers, outside the radiation field by a respective connection line (25) arranged on a main surface (22) of the circuit board. A number of circuit boards are arranged adjacent to each other with the main planes substantially perpendicular to the sensor surface. By using the circuit card depth the invention easily provides surfaces with a very large number of individually connected radiation sensitive elements, resulting in improved image resolution.

Abstract: The present invention relates to a radiation sensor device (20) for detection of radiation. A sensor device with an array of radiation sensitive elements (24) forming a sensor surface (26) is provided. The device comprises a number of circuit boards (21), each with a row of radiation sensitive elements, such as X-ray sensitive charge collectors, provided at the edge portion. The radiation sensitive elements are each connected to signal processing means (28), e.g. ASICs with amplifiers, outside the radiation field by a respective connection line (25) arranged on a main surface (22) of the circuit board. A number of circuit boards are arranged adjacent to each other with the main planes substantially perpendicular to the sensor surface. By using the circuit card depth the invention easily provides surfaces with a very large number of individually connected radiation sensitive elements, resulting in improved image resolution.