ANDA DEVICE FOR PERFORMING THIS METHOD

Technical field

The invention relates to a method of controlling in particular lighting technology by audio signal, wherein the analogue signal of the sound recording is converted into a digital value; and the invention also relates to a device to perform this method.

State of the art

The market offers a variety of lighting technology and panels as well as programs for controlling it. The DMX512 (Digital Multiplex) protocol, designed by the USITT (United States Institute for Theatre Technology) in 1986, is used prevalently for remote centralized control. The whole stage lighting system can be then controlled from a single panel by trained personnel, or using a special prepared programme. Intelligent, centrally controlled technology can be used for architectural lighting, exhibitions, presentations, advertising, theatres, films, and in particular to create an atmosphere during music performances. In this latter case, there are efforts to control the lighting technology in a way corresponding with the specific music performance. It is operated by trained personnel, or a simple control system is used with a microphone, often built in every piece of equipment separately. In some cases the technology is controlled by a pre-set programme, which does not correspond with the music performance at all . Separate control using only a microphone is based only on a simple principle that does not by far use the possibilities of intelligent lighting technology. Most often, the control is based on the detection of peaks in the audio signal, where this detection can be possibly divided into different frequency bands, or is based on distinguishing BPM (Beats Per Minute) . These acquired values are then used to actuate or switch sequences prepared in advance. There are also many visualization programmes, but they only provide software-based visualization on a display device, without the possibility to control any hardware.

Essence of invention

The deficiencies mentioned above are, to a large extent, eliminated by a method of controlling in particular lighting technology by audio signal, wherein the analogue signal of the sound recording is converted into a digital value, as specified in this invention. Its essence is that the data is converted from the time domain to the frequency domain. The acquired data is then used to prepare an arithmetic mean of the sound volume of low, medium and high frequencies in a short and long time span and an arithmetic mean of the overall sound volume in a short and long time span. The obtained values are also assigned to the individual attributes with pre-set data. This data is influenced by the output value of the attribute in the ratio controller, and then an actual scene is generated for each moment in time from this data at the output of each ratio controller; the resulting scene is created from all these scenes so that the values that do not influence mutually the same parameters are bundled into the resulting scene. If the actual generated scenes influence each other, they shall be used based on priority. This obtained resulting scene is intended directly for controlling the connected technology.

The pre-set data comprises, advantageously, information on which technology and which parameter is influenced, is created by scene or a sequence of scenes in time. The scene is static value which defines status of technology.

The invention also relates to a device to perform this method. The device comprises of a sound signal input, to which an A/D converter is connected. A signal converter from the time domain to the frequency domain is connected to the A/D converter, and an averaging device is connected to the converter to average the values from the frequency domain; an attribute associated with an information element using a ratio controller is attached to its output, where a switch is attached to all information elements to allow an immediate attachment of the information element at the output .

A complementing unit is installed advantageously between the switch and the individual ratio controllers.

This solution allows using the data obtained from the sound to control the technology.

The goal of this invention is to allow the creative control of lighting and other technology directly by music, thus using its possibilities better. Some of the advantages offered by this new control method compared to the previous method of control by an illuminator or a program are as follows . It is possible to synchronize individually each connected device with the music, regardless of their quantity. Another advantage is an immediate response to any unpredictable changes in music. It is possible to harmonize the lighting technology even with new, previously unknown performances. The solution allows a better utilization of the technology. Unlike control by specialized personnel, this equipment never gets tired and allows non-stop operation. It is not necessary to interfere with the control, as the music contains all of the necessary information. The system can be also used where lighting technology is already installed.

List of drawings

An embodiment of this equipment for controlling in particular lighting technology by audio signal as described in this invention will be described in detail on a specific example using the attached drawing, where figure 1 shows the connection diagram.

Embodiments of the invention

The audio signal from the converter 3_ of the signal from the time domain to the frequency domain and from A/D converter 2_ is brought to the input of each attribute 5a.1 to 5a. n. Each of the attributes 5_a has attached information element 5b includes data set by the user. This data comprises information on which equipment and which parameter shall be influenced by the given attribute 5a. This can be static data or the so- called scene, or a sequence of scenes in time - chase. Output from the information element _5b is influenced by the output value of the attribute Ξ>a in the ratio controller 5_c_ as follows: (a) in a static scene, the size of the input values is given linearly in the same proportion as the output value of the attribute Sa. In case the marginal value of the output of the attribute 5a is 100%, the output of the ratio controller 5_c shows exactly the same data as defined by the user in information element 5b. In case the marginal value is 0%, the output of the ratio controller 5_c is zero, (b) in case of a chase, the output of the attribute 5_a influences linearly the speed of this chase in the range of 0 to 100%. If the output of the attribute 5_a is zero, the output of the ratio controller 5c_ is also zero. The output from all ratio controllers 5c .1 to 5c .n is brought to the complementing unit 6_, where a resulting scene is generated for each moment in time. The value from the scene generated in the ratio controllers 5_c_, if zero, is ignored by the complementing unit 6_. The other scenes are used to generate the resulting scene so that the values that do not influence mutually the same parameters of the same equipment are only bundled into the resulting scene. If, however, some scene at the output of the ratio controllers j5c_ influences the same parameters of the same equipment, the decision on the use of the value from the scene on output of ratio controller 5_c_ shall be made by priority. Unless specified otherwise, the priority of the ratio controllers 5c.1 to 5c. n is given linearly, where the first connected ratio controller 5c .1 has the lowest priority and the last ratio controller 5c.n the highest priority. This obtained resulting scene at the output of the complementing unit 6_ is intended directly for controlling the connected technology.

The connection can be extended by an averaging device 4, to which the audio signal in frequency domain from the converter 3_ and in time domain from A/D converter 2 is also brought . This averaging device A_ performs the most frequently used calculations and sends them to all assigned attributes 5a.1 to 5a. n. This reduces the number of redundant calculations that would be performed in each attribute 5a.1 to 5a.n separately. These can be values such as arithmetic mean of the sound volume of low, medium and high frequencies in a short and long time span and arithmetic mean of the overall sound volume also in a short and long time span.

Another extension is the connection of a switch 1_, which can send data from selected information element 5b.1 to 5b. n directly to the output J3. This makes it possible to visually check the behaviour of the lighting technology as set by the user for the given attribute 5_a.

The attribute 5_a is any connection or algorithm that generates other values from the values obtained in A/D converter 2_, converter 3_ or averaging device 4_; in a way, these other values express what happens in the music. These can be exact as well as non-exact procedures. Examples are attributes 5_a that induce times in the music or express the sound volume in different frequency bands. Another example is an indication showing whether the sound volume is declining or growing. Generating this data is then obvious. All values obtained from the averaging device 4_ can be also used as an attribute _5a. The attribute 5_a indicating volume intensity in low frequencies only uses this value from the averaging device 4_, where the intensity is multiplied at the output by a constant, if applicable, with a defined minimum value under which the output shall be permanently zero and with a defined maximum value which, when exceeded, shall always yield the maximum (100%) at the output. The connection diagram of the embodiment shows the output JL of the audio signal, to which an A/D converter 2_ as well as a converter 3 of the signal from the time domain to the frequency domain are connected; the latter converter can be based for example on Fast Fourier Transformation (FFT) . The averaging device 4_ averages the values from the frequency domain. The data in the frequency domain is divided into three consecutive areas and its arithmetic mean is calculated for each area at any moment in time. The arithmetic mean for all values in the frequency domain is also calculated. All these four values constitute the output from the averaging device 4_. Another 8 values are generated so that the first four obtained values are averaged as an arithmetic mean with a small number of values obtained for previous time moments (steps) and averaged as an arithmetic mean with a large number of values obtained for previous time moments (steps) .

The information element 5_b contains data that carries information on which equipment and which parameter shall be influenced by the given attribute _5a. In the ratio controller 5c, the output data A is converted into output data C in the ratio given by the input value B. In the complementing unit 6_, one data framework (of the same format) is generated from the data obtained as outputs from all ratio controllers so that the data from the ratio controllers _5c_, if zero, is ignored by the complementing unit 6_.

The switch 7_ makes it possible to connect any one input to the output. As a default, the output from the complementing unit 6_ is attached to the output of the switch 1_. If the user needs to check the data associated to any attribute 5a, he can send it directly to the output 8_ using the switch 7. This obtained data is already sent directly to the connected technology.

Industrial use

The method for controlling in particular lighting technology by audio signal and a device to perform this method can be used especially where lighting and other technology has to be synchronized with music. Operation can be fully independent or in cooperation with control performed by operating personnel.