Sennheiser Electronic Gmbh & Co Kg

Sennheiser Electronic Se & Co. Kg

Jan Watermann

Sebastian Georgi

Frank Plath

Thomas Wirth

Thomas Haustein

Dennis Wieruch

Axel Schmidt

Tom-Fabian Frey

Axel Haupt

Gerrit Buhe

Andreas Stefan Wilzeck

Hatem Röschmann-Foudhaili

Udo Krüger

For radio transmission via OFDM (Orthogonal Frequency Division Multiplex) and TDMA (Time Division Multiple Access), it is important to have at the receiver the exact carrier frequency, and further to perform time synchronization. For time synchronization and simultaneous detection of a carrier frequency offset, a complex-valued synchronization sequence such as e.g. a Zadoff-Chu-sequence is transmitted twice: first in its original version and then, after a predefined time span, in its complex conjugate version. At the receiver, the two corresponding correlation maxima are detected by cross-correlation, and the time span between the maxima is measured. The measured time span is compared to the predefined time span and a time offset is determined. The time offset can be used to improve the synchronization accuracy and to determine the carrier frequency offset.

Method and device for synchronization

A method of wireless audio transmission between a wireless transmitter and a wireless receiver in a program making special event PMSE system. An audio signal is transmitted from the at least one wireless transmitter to the wireless receiver by way of a first wireless transmission path. The at least one wireless transmitter is coupled to a smart device by way of a second wireless transmission path in order to exchange parameters and/or data. Exchange of parameters and/or data occurs between the smart device and the wireless receiving unit by way of a network, in particular the Internet.

Wireless audio transmission system having at least one microphone hand-held transmitter and/or bodypack

Protection helmets may include integrated communication systems to allow the wearer to communicate with other persons. In a very loud environment, a reduction of ambient noise may be helpful, for example, for improving wireless communication. An improved protection helmet includes a helmet shell, a chin guard, a first microphone mounted on the inside of the chin guard and facing the mouth of the wearer, a second microphone mounted on the outside, the upper side or the lower side of the chin guard and not facing the mouth of the wearer, an electronic noise reduction unit generating a difference signal between signals of the first and the second microphone, and at least one interface for outputting the difference signal. Ambient noise in the signal of the first microphone can be reduced with the signal of the second microphone.

Protection helmet with two microphones

A method for operating at least one mobile radio device that includes a transmitter, a slot for receiving a power supply unit, and a control unit for controlling operation of the transmitter depending on the radio parameters and/or configuration data. Radio parameters and/or configuration data are transferred to a memory of the power supply unit. The power supply unit is inserted into the slot. Operation of the transmitter is controlled by the control unit based on the radio parameters and/or configuration data that are stored in the power supply unit.

Method for operating at least one mobile radio device, power supply unit for mobile radio device, charger and audio transmission configuration system

A method of low-latency audio transmission in a mobile communications network utilizing first data frames or subframes encoded according to a first format and shorter second data frames encoded in another second format for audio data. An audio transmission system includes a terminal, a base station, and an audio receiver. The terminal transmits via an uplink audio data that are encoded in the second format and other data that are encoded in the first format. The audio receiver directly receives the audio data transmitted via the uplink. The encoding/decoding of the audio data of one of the second data frames is influenced by other audio data of the same second data frame but not by audio data of another second data frame. Audio transmission from the terminal to the audio receiver is effected in the allocated time slots and frequencies in a waveform in conformity with the mobile communications network.

Method and system for a low-latency audio transmission in a mobile communications network

A wireless microphone and/or in-ear monitoring system having at least one first mobile device for wirelessly transmitting first audio signals. The system also has at least one base station for wirelessly receiving the first audio signals transmitted by the mobile device. The wireless transmission is based on an orthogonal frequency-division multiplexing transmission (OFDM) during a time-division multiple access (TDMA) time slot. Each wireless microphone occupies at least one slot within 2 ms. Each of the TDMA frames has a plurality of slots which respectively have precisely one OFDM symbol. Accordingly, precisely one OFDM symbol is transmitted in each TDMA slot. During a time slot made available in accordance with the TDMA, a transmission is effected on the basis of an OFDM method. The TDMA frame length is so short as a latency of &#x3c;4 ms is required for professional audio transmission, for example in the case of wireless microphone systems.

Wireless microphone and/or in-ear monitoring system and method for controlling a wireless microphone and/or in-ear monitoring system

A wireless microphone or wireless in-ear monitoring system. The system has at least one transmitting and/or receiving unit, which comprises at least two antenna modules, each of the antenna modules having an output plug unit, as well as a combining unit with an input interface. Output signals of the at least two antenna modules are received via the input interface of the combining unit. This is done for those input plug units that are inserted into the input interface of the combining unit. This is carried out in order to execute diversity processing of the signals of the antenna modules.

Wireless microphone or wireless in-ear monitoring system

Wireless microphone and/or in-ear monitoring system and method of controlling a wireless microphone and/or in-ear monitoring system

There is provided an electronic device comprising an FPGA unit (), a first and a second memory () for storing boot data for the FPGA unit and a digital potentiometer () for storing a first and a second setting. In the first setting of the potentiometer the first memory () is coupled to the FPGA unit () and in the second setting of the potentiometer the second memory () is coupled to the FPGA unit () for booting.

Coupling an FPGA unit to a memory using a digital potentimeter

Thus there is provided a microphone () having a first end () with a first slip ring () which is divided into at least first and second segments (GND,). The first slip ring () co-operates with a microphone head () when the microphone head () is fastened to the first end () of the microphone by means of a screw connection. The microphone further has a detection unit () coupled to the at least first and second segments (GND,) of the first slip ring () to detect rotation of the microphone head ().

Microphone

The invention relates to a process for the transmission of digitized audio information of high quality and with a short delay, in particular processes for the transmission of digitized audio information in an audio pickup (microphone) and/or playback path. According to the invention there is proposed a channel filter which is used to shape the high frequency spectrum of the transmission, wherein the spectrum has no attenuation in a first range of about 100 to 300 kHz useful bandwidth and in a range outside the first range it has a stop-band attenuation of particularly preferably more than 60 dB or more than 80 dB.

Growing community of inventors

Hannover, Germany

Jan Watermann