A process for testing a turbine of a gas turbine engine at high altitudes, where a large volume of compressed air is stored in a large reservoir of at least 10,000 m.sup.3 such as an underground storage cavern, compressed air from the storage reservoir is passed through heat exchanger to preheat the compressed air to a temperature that would normally be discharged from a compressor, the preheated compressed air is burned with a fuel in the combustor, and additional compressed air from the reservoir is passed through an injector located downstream from the turbine to produce a decreased pressure such that a low atmospheric condition at the turbine exit is simulated.

A process for testing a combustor of a gas turbine engine, where a large volume of compressed air is stored in a large reservoir of at least 10,000 m.sup.3 such as an underground storage cavern, compressed air from the storage reservoir is passed through heat exchanger to preheat the compressed air to a temperature that would normally be discharged from a compressor, the preheated compressed air is burned with a fuel in the combustor, and additional compressed air from the reservoir is passed through an injector located downstream from the combustor to produce a decreased pressure such that a low atmospheric condition at the combustor exit is simulated.

A process for testing a turbine of a gas turbine engine at high altitudes, where a large volume of compressed air is stored in a large reservoir of at least 10,000 m.sup.3 such as an underground storage cavern, compressed air from the storage reservoir is passed through heat exchanger to preheat the compressed air to a temperature that would normally be discharged from a compressor, the preheated compressed air is burned with a fuel in the combustor, and additional compressed air from the reservoir is passed through an injector located downstream from the turbine to produce a decreased pressure such that a low atmospheric condition at the turbine exit is simulated.

A process for testing a combustor of a gas turbine engine, where a large volume of compressed air is stored in a large reservoir of at least 10,000 m.sup.3 such as an underground storage cavern, compressed air from the storage reservoir is passed through heat exchanger to preheat the compressed air to a temperature that would normally be discharged from a compressor, the preheated compressed air is burned with a fuel in the combustor, and additional compressed air from the reservoir is passed through an injector located downstream from the combustor to produce a decreased pressure such that a low atmospheric condition at the combustor exit is simulated.

An antenna attitude fast measurement system and a method are provided. The measurement system includes a data processing unit, a stereo calibration unit, at least two detector measurement units, and a plurality of target marker units; the target marker unit is arranged on the back of the antenna main reflector of the antenna system to be measured; the detector measurement unit is arranged outside the circumference of the antenna system to be measured; and the stereo calibration unit is arranged directly below the center of the antenna main reflector of the antenna system to be measured. Any two adjacent detector measurement units have a field-of-view intersection area, and there is at least one target marker unit within the field-of-view intersection area. The total number of target marker units in all field-of-view intersection areas is 3. The data processing unit is electrically connected to the detector measurement unit.

Examples described herein relate to management of concurrent audio streams from different sources. Portable playback devices, such as wearable wireless headphones and earbuds, as well as portable battery-powered speakers, may include multiple network interfaces for connection to different types of networks, such as an 802.11-compatible network interface for connection to wireless local area networks (e.g., Wi-Fi networks) and an 802.15-compatible network interface for connection to a mobile device via a personal area network (Bluetooth). Via such connections, the playback devices may receive two or more concurrent streams. By managing these streams according to playback policies, the portable playback devices may play the user's intended audio without necessarily requiring user input to explicitly select among the concurrent streams.

The present invention relates to a method for processing and playing audio data comprising the steps of receiving mixed input data and playing recombined output data. Furthermore, the invention relates to a device 10 for processing and playing audio data, preferably DJ equipment, comprising an audio input unit for receiving a mixed input signal, a recombination unit 32 and a playing unit 34 for playing recombined output data. In addition, the present invention relates to a method and a device for representing audio data, i.e. on a display.

An audio transmission method and an electronic device are provided. The audio transmission method includes: modulating, when the first electronic device transmits audio to a second electronic device, an audio signal transmitted to the second electronic device into at least two target radio frequency signals; and combining the at least two target radio frequency signals in a first time slot, and outputting a combined radio frequency signal to the second electronic device, where frequency bands of the at least two target radio frequency signals are different in the first time slot.

An audio application determines a left magnitude of the audio source (LS.sub.k) and a right magnitude of the audio source (RS.sub.k). The audio application determines an amplitude difference (D.sub.k). The audio application calculates a temporal derivative d(D.sub.k) of the D.sub.k. The audio application determines an average of LS.sub.k and RS.sub.k to obtain a mid-channel spectrogram (MCS.sub.k). The audio application normalizes the MCS.sub.k to obtain a normalized value (R.sub.k). The audio application divides d(D.sub.K) by R.sub.k to obtain a confidence map. The audio application computes a blending weight by scaling and clipping the confidence map. The audio application combines the MCS.sub.k, the blending weight, and the L.sub.t to obtain a left modified channel, and combining the MCS.sub.k, the blending weight, and the R.sub.t to obtain a right modified channel.

The present invention relates to a method for processing and playing audio data comprising the steps of receiving mixed input data and playing recombined output data. Furthermore, the invention relates to a device for processing and playing audio data, preferably DJ equipment, comprising an audio input unit for receiving a mixed input signal, a recombination unit and a playing unit for playing recombined output data. In addition, the present invention relates to a method and a device for representing audio data, i.e. on a display.