1. A flight recording system in an aircraft comprising:
recording means destined to record conversations and audio communications,
audio management means destined to provide recording means with signals output from the audio environment in the cockpit, and
a box containing said recording means and said management means.
2. The system according to claim 1, wherein said recording means and said management means are combined together to form a single unit materialized by said box.
3. The system according to claim 1, wherein said box comprises:
a memory to store recorded data, said memory being protected by a casing) resistant to shocks, fire and immersion, first and second end systems adapted to be connected to first and second aircraft networks respectively,
first and second digital sound links, each of said links being adapted to be connected to a set of audio channels comprising a first channel for the pilot, a second channel for the co-pilot, a third channel for the third occupant, and a fourth channel for the audio environment in the cockpit,
first and second digital signal processing means connected to the first and second end systems respectively and to the first and second digital sound links, said first and second processing means being configured to manage and process data and signals passing through the first and second end means and through the first and second digital sound links,
a calculation means providing the interface between said memory and said first and second processing means, said calculation means being configured to compress data to be recorded and to adapt corresponding signals before recording them in said memory, and
electrical power supply means designed to provide appropriate voltages to the different means in the box.
4. The system according to claim 3, wherein the first processing means are dedicated to pilot conversations and communications, while the second processing means are dedicated to co-pilot conversations and communications.
5. The system according to claim 3, wherein the first and second processing means are adapted to manage radio communication and radio navigation functions.
6. The system according to claim 3, wherein the first and second processing means and the calculation means are adapted to manage and record data messages received from the first and second networks through the first and second end systems in the memory.
7. The system according to claim 1, wherein said box is provided with reversible attachment means on the aircraft.
8. The system according to claim 1, wherein the box is compatible with the ARINC 600 standard.
9. The system according to claim 1, wherein the box is compatible with the ARINC 404 standard.
10. An aircraft comprising a recording system according to claim 1, wherein a first box containing said recording means and said management means is installed in an avionics rack and a second box containing said recording means and said management means is installed in an aft part of the aircraft.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device for generating and detecting coherent electromagnetic radiation (8) in the THz frequency range, comprising an optically parametric oscillator (2) for generating electromagnetic radiation in the THz frequency range (8), characterised in that it has a coherent phase-sensitive detector (3, 21) for detecting intensity and phase of the electromagnetic radiation (8) generated by the optically parametric oscillator (2).
2. A device according to claim 1 characterised in that it has a source (1) for generating an electromagnetic pump radiation (12) at a first frequency, wherein the source (1) for generating the electromagnetic pump radiation (12), the optically parametric oscillator (2) and the coherent phase-sensitive detector (3, 21) are so adapted that in operation of the device at least a part of the pump radiation (12) is passed into the optically parametric oscillator and a part of the pump radiation is passed into the coherent phase-sensitive detector (3, 21).
3. A device according to claim 1 or claim 2 characterised in that the optically parametric oscillator (2) and the coherent phase-sensitive detector (3, 21) are so adapted that in operation of the device at least a part of the electromagnetic pump radiation (12) which passes through the optically parametric oscillator (2) is passed into the coherent phase-sensitive detector (3, 21), wherein in the optically parametric oscillator (2) electromagnetic radiation at a second frequency different from the frequency of the pump radiation (12) and from the THz frequency is generated and wherein the optically parametric oscillator (2) and the coherent phase-sensitive detector (3, 21) are so adapted that in operation of the device the electromagnetic radiation at the second frequency is passed into the phase-sensitive detector (3, 21).
4. A device according to one of claims 1 to 2 characterised in that it has a source (20) for generating electromagnetic radiation at a second frequency, wherein the source (20) for generating the electromagnetic radiation at the second frequency, the optically parametric oscillator (2) and the coherent phase-sensitive detector (3, 21) are so adapted that in operation of the device a first part of the electromagnetic radiation at the second frequency is passed into the optically parametric oscillator (2) and a second part of the electromagnetic radiation at the second frequency is passed into the coherent phase-sensitive detector (3, 21).
5. A device according to one of claims 1 to 2 characterised in that the coherent phase-sensitive detector (21) has a matrix arrangement of pixels.
6. A device according to one of claims 1 to 2 characterised in that the coherent phase-sensitive detector is an electrooptical detector (2).
7. A device according to one of claims 1 to 2 characterised in that the coherent phase-sensitive detector is a photoconductive detector (3).
8. A THz spectroscopy system having a device according to one of claims 1 to 2.
9. An imaging THz system having a device according to one of claims 1 to 2.
10. A method of generating and detecting coherent electromagnetic radiation in the THz frequency range, wherein an optically parametric oscillator is used for generating the electromagnetic radiation in the THz frequency range, characterised in that a coherent phase-sensitive detector is used for detecting intensity and phase of the electromagnetic radiation generated by the optically parametric oscillator.