Abstract: A method for determining a distance between a device and an object, the method comprising: emitting an acoustic reference signal from a speaker of the device; receiving an acoustic input signal at a microphone of the device, the acoustic input signal including a measurement portion including a reflection of the acoustic reference signal off the object; cross correlating at least the measurement portion with the emitted acoustic reference signal to provide a cross correlated signal; receiving information relating to the object; extracting a section of the cross correlated signal corresponding to reflection of the acoustic reference signal by the object, based on the received information; analyzing the extracted section of the cross correlated signal to determine a time of flight between emitting the acoustic reference signal and receiving the reflection; and determining the distance between the device and the object based on the determined time of flight and known characteristics of the acoustic reference sign

Abstract: Systems and methods are disclosed that provide for low-power monitoring of the acoustic echo path around a device to enable device triggering based on activity detection in the environment. An ultrasonic (or more generally an acoustic) reference signal is played through a speaker at well-chosen intervals and its echoes recorded through a microphone. The recorded signal is analyzed to obtain an estimation of the total echo path or echo energy. By monitoring this estimation variation, significant changes in the echo path or echo energy can be identified and used as a trigger. In one embodiment, a hand approaching a phone changes the echo path, activating the phone to a power on mode. In another embodiment, a user using a phone close to the ear changes the echo energy, triggering the phone to select the “ear-fit” mode speaker/microphone.

Abstract: A method for determining a distance between a device and an object, the method comprising: emitting an acoustic reference signal from a speaker of the device; receiving an acoustic input signal at a microphone of the device, the acoustic input signal including a measurement portion including a reflection of the acoustic reference signal off the object; cross correlating at least the measurement portion with the emitted acoustic reference signal to provide a cross correlated signal; receiving information relating to the object; extracting a section of the cross correlated signal corresponding to reflection of the acoustic reference signal by the object, based on the received information; analysing the extracted section of the cross correlated signal to determine a time of flight between emitting the acoustic reference signal and receiving the reflection; and determining the distance between the device and the object based on the determined time of flight and known characteristics of the acoustic reference sign

Abstract: A remote control extension system for controlling appliances (60,70,80). A remote control (20) is connected by means of a network (30) to an extender device (40). The remote control (20) transmits messages (110,120) to the extender (40) during the period, that a command (14) is to be transmitted from the extender to an appliance. The command is for example a command having a variable duration, such as Volume UP. The extender (40) receives the messages. It transmits the command as long as it receives the messages from the remote control. It finishes the transmission of the command, if an expected message has not been received at a predetermined time. In this way, the duration of a command is limited in case of network disturbances.

Abstract: A system and method for data communications involves receiving a data frame in a receiver using a sliding receive window protocol, where a sliding receive window of the sliding receive window protocol is identified by sliding receive window information, and determining whether the data frame is a retransmitted data frame using the sliding receive window information.

Abstract: A system and method for data communications involves receiving a data frame in a receiver using a sliding receive window protocol, where a sliding receive window of the sliding receive window protocol is identified by sliding receive window information, and determining whether the data frame is a retransmitted data frame using the sliding receive window information.

Abstract: A remote control extension system for controlling appliances (60,70,80). A remote control (20) is connected by means of a network (30) to an extender device (40). The remote control (20) transmits messages (110,120) to the extender (40) during the period, that a command (14) is to be It transmitted from the extender to an appliance. The command is for example a command having a variable duration, such as Volume UP. The extender (40) receives the messages. It transmits the command as long as it receives the messages from the remote control. It finishes the transmission of the command, if an expected message has not been received at a predetermined time. In this way, the duration of a command is limited in case of network disturbances.

Abstract: The buffer management system (100) is arranged to control in a data communication system an end to end delay (?) of a data unit (150) from input to output. Blocks (104, 106) of data units (150, 152) are written in a buffer (102) with a block write rate (Rw), and data units (154, 156) are read from this buffer (102) with a read rate (Rr). The end to end delay (?) is controlled by adapting the read rate (Rr) from the buffer (102), and hence the buffer filling (F) on the basis of measurements of delays in the buffer management system (100).