Patent certificates

A list of RT-RK granted patents certified and issued by the Intellectual Property Office of the Republic of Serbia.

System and technique for hands-free voice communication using microphone array

Patent number: RS49875


Invention refers to a system and procedure for hands-free voice communication in video-phone or teleconference applications and the use thereof based on microphone sequence the aim of which is a high quality recording of the voice of a speaker in a room and in the conditions of a large distance, of existing disturbances, accoustic echo from a distant speaker and TV programme, reverberation of the room and move of the speaker in the room.

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The system consists of: a digital TV receiver and a digital camera for reproduction and record of the image, respective, stereo loudspeakers and microphone set for reproduction and recording the sound, respectively, amplifying and aquzitional module for audio signals and DSP for treatment of accoustic signals.

The procedure for treatment of microphone signal is carried out in the frequency domain and consists from: accoustic echo suppression, coming from the signal of distant speaker and stereo signal of TV programme, filtration of the adjacent speaker in the space in relation to the sources of noise and reverberation of the room on the basis of adaptive characteristics of directing the microphone sequence, location of the speaker in horisontal plane, suppression of all the residual disturbances and adaptive control of amplifying the sending signal. 7 channels FFT AEC accoustic echo suppresser SD-BF superdirective directing unit DOA azimuth NR echo suppresser AGC FFT Toward a distant speaker Camera surveilance control

Technique and system for automatic gain control (agc) using microphone array

Patent number: RS49857


Invention belongs to the procedure and system for automatic control of a speech signal gain (AGC) recorded by means of a microphone sequence in specific 'hands-free' teleconference conditions of communication and in accoustic ambience with large level of various interferences such as: accoustic echo, interferential noise, reverberation and other speakers, as well as a different position of a speaker in space in comparison to the microphone sequence.

The procedure for AGC consists from: estimation of trajectory of peak speech power of the speech signal, estimation of powers of accoustic interferences and participation thereof in determination of coeficient of increase, determination of the downward(11)compression characteristics, determination of coefficient of amplification for AGC and formation of speech signal output with minimal distortions.
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The system consists of one input and one output for the current speech signal, several inputs whereto the signals are brought for accoustic disturbance estimation, and three inputs whereto are set three constants that define the field of active functioning AGC: nominal power of output signal, dynamics of change of automatic gain control (AGC) system and maximal downward slant of compression characteristics. AEC SD VF Power Estimation of Diffused Noise Echo Power Estimation Formula u cetvrtom redu odozgo Slope estimation Gain coefficientPeak Power Estimation Moment Power estimation.

System and technique for speaker localization using microphone array

Patent number: RS49859


Invention refers to a speaker localization system and procedure in open or closed room, which is based on the grounds of implementation of a set of microphone in sequence with arbitrary number of microphones and which may be applied in control and management of robots, video surveillance and processes that demand interactive information on localization of a speeker, or in 'hands-free' communication systems such as teleconference systems, video conference systems, speakerphones, and alike.

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The system consists of a microphone in series, activation module and a module for treatment of acoustic and speech signals.

The procedure is based on the cross correllation, i.e. phase transformation PHAT, optimized according to characteristics of speech signal and on a detector of speech activity (VAD) on the base of superdirective rectifier (SD-BF). Optimization of PHAT cross correlation achieves improved accuracy and more precise estimation of angle and azimuth [theta] while application of SD-BF in VAD improves the reliability of estimation in dynamic conditions of application of the system for localization of a speaker. Determination of a filtration function W(n) Pretreatment of a signal and FFT Cross correlation analysis -> PHAT -> Azimuth estimation -> VAD

Technique to estimate direction of arrival of sound source by dual microphone system

Patent number: RS49858


Invention uses dual microphone system based on a computer and consists a procedure by means of which estimation of direction of sound arrival is carried out from active speaker in accoustic ambience with reverberation and noise. Herewith described procedure anticipates a michophone pair set in a horisontal area, as to a definced distance, and that the procedure detects the presence of an active speaker and determines its direction, i.e azimuth angle in comparison to the symmetry to a microphone in horisontal plane.
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Invention is characterized by specific procedures : (1) pre-treatment of a segment of one microphone signal with a task to detect segments with accoustic sounds, as these are suitable at cross-correlation of signal. It uses an analysis of values of several properties in frequential domain, i.e. signal power in certain spectral range, unification of spectrum and spectral centroid; (2) interpolation of subintervals of temporal and cross-correlative function for the purpose of increase in accuracy of direction of arrival which is being aimed to increase the reliability and reduce the function of final estimation of arriving direction.

This system employs a personal computer wherein are implemented procedural treatments from the invention and may be implemented in the field of localization of a speaker, i.e. to control direction of a robot, improve the quality of a speech signal, control the camera surveilance and alike.

Method and technique for remote lighting control using acceleration measuring circuits

Patent number: RS52364


Invention herewith described refers to the method and technique for remote lighting control using acceleration measuring circuits that includes the remote controllers that manage the lighting using the acceleration sensor and (i) two-dimensional movements, rotation around the axis, and (ii) three-dimensional movements i.e. free rotation.
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The sensor for the acceleration measuring is mounted and fixed on the printed circuit board; on the same printed circuit board, there is an autonomous power source and block for wireless communication. These three components make the unit which is installed into the movable part of the remote controller - switch.

When rotating the movable part of the controller, its absolute position relative to the Earth's axis is determined and on the basis of information obtained from the sensor the rotation angle is calculated that corresponds to a command issued to the controlled device - lighting body.


Patent number: RS53023


The invention herewith described refers to the system for marking the road edge in low visibility conditions using wirelessly coupled signalling devices mounted near the road edge. The signalling devices dynamically emit signalling light in the direction of a vehicle movement. The signalling light is activated by the first signalling device, after its detection of a vehicle, which sends the message via the wireless communication to the next signalling device in the direction of the vehicle movement. After the the reception of the message, the next signalling device also activates the signalling light and based on the built in logic, decides whether to pass the message further to the next signalling device. Also, each signalling device which turns on its signalling light, initiates the turning on the signalling light by its signalling device pair on the other side of the road.

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In this way, the series of light sources is formed that illuminate both sides of the road in the direction of a vehicle movement, and in the way that road edge on the road side of the vehicle movement is marked in red light while the opposite direction road edge is marked in white light. Immediately after the vehicle passes the signalling device, it stops emitting the light. The system dynamic is accomplished therewith that only certain number of devices emits the signalling light in the direction of a vehicle movement, immediately ahead of the vehicle. The system can also work in the special signalling mode in which it provides information to drivers about unusual road circumstances (traffic accidents, road work ahead, traffic jam, passing of special purpose vehicles).; The system enters this operating mode after receiving the appropriate message sent from the special purpose vehicles (police vehicle, fire-fighter vehicle, ambulance vehicle, road maintenance vehicle...).


Patent number: RS53045


Invention herewith described refers to the device verification and test process that has an important part in the product development, production and marketing process. Test methods that are applied nowadays are mainlv based on manual verification. The methodologv presented in this invention facilitates the automation of verification and test processes of the multimedia devices as well as greater reliability of the final device (exclussion of the human factor from the testing process), reduces the production costs (by acceleration of the verification and test processes and the shorter time to market) and provides an opportunity to reuse the created verification procedures.

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Patent number: RS53478


Invention herewith described refers to the remote controlled switch for the light intensity control where the turning ON/OFF and the light intensity can be controlled. The invention also refers to the creation of a network of switches that can send commands to each other and thus provide the control of any switch from any physical location. The remote controlled switches for the light intensity control can be used in the network of controlled power elements (sockets and switches for the light intensity control), which is controlled by the remote controller and some commands can be sent from the switches for the light intensity control and the sockets.
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Patent number: RS53442


Invention herewith described refers to the intelligent voltage dividers. In recent years, under the influence of new technologies, the voltage dividers have been much changed. Nevertheless there is still room for further improvements. Most of the changes apply to the device protection against the power supply loss. The described patent is one such solution that is based on energy expenditure measurement and the control of every single socket.
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Patent number: RS53477


Invention herewith described refers to the intelligently managed system for the power supply control of electric appliances connected to power lines. The system allows the user an easy control of electric elements (switches and sockets for the light intensity control), and therefore the appliances attached to them. The system consists of the remote controlled switches for the light intensity control that control the light sources, of the remote controlled power sockets, and the remote controllers easy to use and control each element, and group of elements defined by the user.Elements of the system do not require new wiring, but they are installed instead of the existing standard sockets and switches for the light intensity control.
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Patent number: RS53480


The invention herewith described refers to design of the system for echo suppression based on USB audio devices.Increase of the number of devices used for the voice communication over IP network has increased the need for the reduction of the echo of audio devices, therefore this invention refers to the architecture of the system used to suppress the echo where the time delay between the emitted sound and the recorded sound for the later processing is short and almost constant. This system can also be used for other audio signal processing where it is important that the time delay is short and almost constant. Delay of the signal, which is short and little variable in time, allows more quality and easier sound processing that require less processing ability of the system, and thus can be used on less powerful computers.
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Patent number: RS53603


Invention herewith described refers to the remote control unit for the energy element control (switches for the light intensity control and outlets), where the condition of the element can be monitored and controlled. The invention also refers to the creation of network of the elements that are controlled by the remote control unit, where the elements can be controlled, as individual elements or as parts of one or more groups.The remote control unit consists of the radio transmitter-receiver - RF, the central processing unit (CPU) - Processor, the keyboard, the battery, and the control electronics .

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Patent number: RS53604


Invention herewith described refers to the procedure and system for automatic evaluation of video material based on the perceptual approach with the application of the multi-models. Each model from the multi-model is constructed and optimized over the appropriate cluster of samples of calculated objective characteristics of video frames in the formed space of objective characteristics. In addition to the independent partial models of quality evaluation defined over the specific clusters in space of characteristics, the invention also refers to the inclusion in the multi-model of the integral model of quality constructed by using the entire set of samples in the space of characteristics. The final evaluation of video quality is the weighted sum of evaluations of individual models that form the multi-model.; The influence of the individual model determines the affiliation of the vectors of video frame characteristics using the corresponding space clusters of the objective characteristics.

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Patent number: RS53564


Invention herewith described refers to the procedure and system for video data compression and decompression without loss in real time. The idea of the invention is to provide transmission of high definition (HD) video signals without loss in real time, via Ethernet network for data flow, which is achieved by using the method of the fast image compression without the loss based on the content similarity of adjacent horizontal lines within the image and the parallel formation of the multiple compressed video streams with similar content.; On the encoder side, there is accomplished a fixed or adaptive image partitioning into equal segments with the pre-scheduled segmentation step, depending on image content variability, where is for the adjacent horizontal segments of the image assumed that are highly correlated with each other and that can be compressed to approximately the same length. Simultaneously are formed the multiple video streams so that each video stream one after another contains one horizontal line from each of the existing segments of the image, whereby there is achieved the content similarity of video streams.; At the same time, there is performed the compression of video streams with similar content using the entropy coding method, where the pixels in one horizontal line which successively appear more often, are coded shorter than those appearing less frequently, whereby there is achieved the video data compression without losses. The content similarity of the video streams allows the parallel use of the same processing cluster over the video streams thus contributing to higher speed of video data decompression on the decoder side.

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Patent number: RS53535


Invention herewith described refers to the remote controlled outlets where the turning ON/OFF and the maximum power can be controlled. It also refers to the creation of a network of the outlets that can be grouped and controlled either individually or as a part of the group. Furthermore, the outlet refers to the remote controlled outlets able to monitor power consumption of the switched on appliance and to determine the normal behaviour over a period of time (normal consumption) and to cut off the power supply of the appliance when detects the anomaly in the power consumption. Further on the invention refers to the remote controlled smart outlets that can read information concerning the power consumption of an appliance as well as control its power supply in accordance with the received information.

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Patent number: RS53536


Invention herewith described refers to the improvement of the existing solutions in the field of implementation and automation of management of the smart electrical installations. The invention includes the system and method for detecting the presence of the user applied to the automatic control of lighting and other domestic installations using an existing wireless communication network and the changes of the signal strength indicator value (in English: Received Signal Strength Indicator - RSSI) between the stationary communication nodes. The presented method involves monitoring the change in value of the RSSI by disruption of the initial value of the established communication field between the nodes within the premises due to the entry/exit of an individual in the room.; The entry of an individual into the established field of communication causes the change of RSSI that is periodically read after any exchange of messages between the nodes. Based on detected changes, a control signal is generated which will be transmitted to the central control unit that converts the signal into a command for room lighting control or other domestic electrical appliances. Implementation of the system includes at least two nodes, which are at the domestic installation level implemented in the form of the smart socket and the smart switch for lighting and the central control unit as a device for managing exchange of messages and commands. These basic units of the system communicate with each other, follow the change of RSSI between the nodes and based on the crossing preset thresholds of signal strength variation, perform the control of room lighting.; In addition to the lighting control, the system manages any electrical device connected to the smart sockets by their switching on or off if it is the required and predefined operation.

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