DE102014226289A1 - Communication method, computing device and communication system - Google Patents

Abstract

The invention provides a communication method, a computing device and a communication system. The communication method comprises the steps of: operating (S01) a control device (ST) of a transmitting device (S) for transmitting a radio signal (FS) within a transmission time window, wherein in the radio signal (FS) a control audio signal (A2) with frequencies is embedded in a predetermined frequency range; Operating (S02) the control device (ST) of the transmitting device (S) for transmitting a transmission time window signal (D1) with an identification code (C2) to an external computing device (30); Receiving (S05) the control audio signal (A2) as sound waves (SW) by a mobile terminal (10); Transmitting (S07) an output signal (A3) based on the control audio signal (A2) to the external computing device (30); Calculating (S08) the transmission time window based on the transmission time window signal (D1); Determining (S09) a reception timing at which the output signal (A3) has been received; Checking (S10) whether the detected reception time of the output signal (A3) falls within more than a determined transmission time window; wherein, if this is not present, a data signal (D2) is transmitted to the mobile terminal (10) by the external computing device (30), the data signal (D2) to be transmitted being based on the identification code (C2) from the transmission time window signal (D2). D1) is selected from a predetermined selection list.

Description

The present invention relates to a communication method, a computing device, and a communication system.

STATE OF THE ART

Methods for transmitting information by means of sound waves have been known for a long time. A simple example is radio stations which transmit radio signals as radio signals to radio receivers, which in turn output the radio signals acoustically and audibly.

The reception of the radio signals by a radio receiver and the reception of the sound waves output by the radio receiver are conventionally not verifiable. Radios transmitters are therefore dependent, for example, on voluntary information from users for verifying the reception of the broadcast radio signals. Also, information about the number of receptions at certain times of day or at specific locations is not automatically available. Receiving radio signals via a walkie-talkie, for example, is usually verified by a verbal acknowledgment from a user.

Digital communication methods, such as via the Ethernet protocol, have a return channel, via which a reception of data can be confirmed. This requires special Ethernet-capable devices both transmitter and receiver side. The range of such information transmission method is significantly lower and requires a higher technical effort than about a transmission by means of a radio signal.

In the EP 1 906 696 A1 a system for providing information is described. The system includes a transmitter for converting various coded information into a sound pressure vibration and for emitting the sound pressure vibration. A terminal of the system is adapted to recover the various coded information by receiving and decoding the sound pressure vibration. The information is transmitted as sound waves through air as the transmission medium from the transmitter to the terminal.

DISCLOSURE OF THE INVENTION

The present invention discloses a communication method having the features of claim 1, a computing device having the features of claim 13, and a communication system having the features of claim 14.

Accordingly, a communication method is provided with the following steps:
Operating a control device of a transmitting device for transmitting a radio signal within a transmission time window by means of an antenna of the transmitting device, wherein a control audio signal is embedded in the radio signal; Operating the control device of the transmitting device to transmit a transmission time window signal corresponding to the transmission time window to an external computing device; wherein the transmission time window signal comprises an identification code; Receiving the radio signal by means of an audio playback device; Outputting the control audio signal as sound waves by the audio reproducing apparatus; Receiving the control audio signal as sound waves through a microphone of a user's mobile terminal; and transmitting an output signal based on the control audio signal of the mobile terminal to the external computing device; wherein the output signal comprises the first identification code; Determining the transmission time window, in particular automatically, based on the received transmission time window signal by means of the external computing device; Determining a reception time, in particular automatically, at which the output signal was received at the external computing device; and checking, in particular automatically, whether the determined reception time of the output signal falls outside of the determined transmission time window nor into at least one further transmission time window with a further identification code of a further control device; wherein, if the determined reception time of the output signal falls only in exactly the determined transmission time window, the following step is performed: transmitting, in particular automatically, a data signal by the external computing device to the mobile terminal, wherein the data signal to be transmitted by the external Computing device, in particular automatically, preferably based on the identification code from the transmission time window signal, is selected from a predetermined selection list.

The radio signal may be, for example, a broadcast signal, such as a radio or television signal. The radio signal may also be a telecommunication signal, such as a telephone signal. The modulation, that is, the imposition of information on a carrier wave, in particular the embedding of the control audio signal in the radio signal, can be done for example by means of amplitude, pulse, frequency and / or phase modulation. Advantageously, the radio signal is formed as a plurality of electromagnetic waves.

The control audio signal may be superimposed on an informational audio signal. The information audio signal may be configured for the acoustic transmission of information. For example, can it is an audio signal from a radio station or a radio station. The audio signal may also be part of a television signal. The informational audio signal may include, in particular, music, human speech, and / or various everyday sounds, such as engine noise, bells, dog barking, and the like. The information audio signal includes audible frequencies. By "audible" is meant those frequencies which are within the human auditory surface. Ultra or infrasound can be examples of inaudible frequency ranges.

The control device can be realized, for example, as software executed by a processor and running on a computer, by means of which the radio signals to be transmitted by means of the antenna can be predetermined and / or adapted. The transmission of the transmission time window signal can take place in particular via an Ethernet protocol, via a TCP / IP protocol, via the Internet, via a wired and / or a wireless (W) LAN network.

The identification code is preferably an identification code indicating the control device. The control device can be associated with a specific radio and / or television station, so that the identification code allows a clear inference on those radio and / or television station, as part of and / or on the radio and / or radio frequency (s) the radio signal is sent out. The identification code may alternatively or additionally also indicate a specific numbering and / or action, for example if a specific radio and / or television transmitter emits a plurality of radio signals according to the invention, which should lead to the transmission of mutually different data signals to the mobile terminal. In this case, the data signal to be transmitted may be additionally selected by the external computing device based on the specific numbering and / or the specific action from the default selection list.

A predetermined frequency range of the control audio signal may be partially formed with audible frequencies and partly with non-audible frequencies. The predetermined frequency range may also consist entirely of audible or completely non-audible frequencies. Thus, the control audio signal can be composed entirely of non-audible frequencies, that is to say extend approximately completely in the ultra, hyper or infrasound range.

The control audio signal may comprise an interpretable logical pattern. Preferably, methods are used which are not perceived by the human ear and thus do not disturb a possible information audio signal. Possible methods are, for example, frequency spreading or the addition of pseudo noises. These methods are also advantageous because analog audio signals are digitized prior to transmission by a broadcasting station and are converted back into analog signals only in the audio playback device. Digitization is usually limited to the audible spectrum with frequencies below 16 KHz. Higher frequencies are advantageous in analog environments, e.g. In-Store Radio, used.

The audio reproducing apparatus may be any apparatus capable of receiving the radio signal FS and outputting the information audio signal and the control audio signal as sound waves. This may be, for example, a smartphone, a laptop, a desktop PC, car radios, TV sets, etc.

The mobile terminal may be a device specially designed for the method according to the invention. It can also be a smartphone, a laptop, a tablet, a camera, a PDA or similar. In particular, the mobile terminal can each be an internet-enabled communication device. Advantageously, the mobile terminal has a display device, for example a touchscreen. The display device can provide the user with additional visual information, such as pictures, product details, concert dates, order information, etc.

The control audio signal can be completely or partially converted into an electrical control signal by the mobile terminal by means of a computer program installed on the mobile terminal, wherein the output signal of the mobile terminal is generated and transmitted based on the electrical control signal. The control audio signal may alternatively trigger that a generic predetermined output signal is transmitted by the computer program.

The electrical control signal may, in particular, be a control signal for the mobile terminal, that is to say a control signal for operating the mobile terminal and / or the computer program. The electrical control signal can operate, for example, the mobile terminal and / or the computer program such that code segments are stored in the memory device of the mobile terminal or in a region of the external computing device directly assigned to the mobile terminal. The storage at an external location can be advantageous because the code segments from there even if the loss of the mobile device or his Storage ability can be retrieved again and again. The code segments may be included in the control audio signal.

The computer program which is installed on the mobile terminal can be for example an app. The computer program can be permanently or permanently installed on the mobile terminal, wherein the mobile terminal is specially designed for the inventive communication method; but the computer program can also be freely installed and uninstalled. The computer program can therefore allow the method according to the invention to be carried out with a large number of different devices.

The computer program can automatically perform its functions according to the invention whenever the mobile terminal on which it is installed is supplied with electrical power. However, the computer program may preferably also be designed such that it must be activated by a user before executing his functions according to the invention. For example, it may be provided that the user must start an app on a mobile terminal, in particular a mobile phone. It can also be provided that the user must make further inputs within an already started app, for example, the app must be moved from a "non-receiving state" to a "receiving state". Alternatively, a wake-up signal can also be transmitted from the external computing device to the app, for example via the Internet, whereupon the app is activated without the user's intervention. The wake-up signal may be used to activate the mobile terminal or app and place it in front of a user interface of the mobile terminal for the user.

Control instructions may be stored in a memory of the mobile terminal, which determine how a particular control audio signal is to be converted into a specific electrical control signal based on parameters of the particular control audio signal detectable by the computer program. Further control instructions can be stored on external computing devices, for example, the external computing device, and be reloaded from there via the stored in the memory of the mobile terminal control instructions.

The control instructions may also serve to determine which part of the sound waves received by the mobile terminal is to be associated with the control audio signal, which part is to be assigned to any informational audio signal and / or which part is not to be assigned to either.

For example, it can be provided that sounds or sounds with frequencies in the predetermined frequency range are automatically assigned to the control audio signal. In this case, a plausibility check and / or an error correction can be carried out. Thus, it can be prevented that sounds or sounds which are not attributable to the control audio signal - for example sounds or sounds from the environment or from any informational audio signal - are erroneously assigned to the control audio signal. Advantageously, parameters of the control audio signal are stored in the computer program (logically) or in a memory device of the mobile terminal (physically) and / or in an external computing device, such as the external computing device, and the received sound waves are compared with these parameters.

Such parameters may include, for example, an overall length of the control audio signal, a number of tones and / or sounds of the control audio signal, a length or a length sequence of tones and / or sounds of the control audio signal, etc. The received sound waves can be picked up by the mobile terminal and analyzed by the computer program with a time delay in order to extract the control audio signal from the received sound waves. Alternatively, the analysis of the received sound waves can also be done in real time. A first tone or sound may be provided at a first frequency, which signals that the control audio signal is starting. A second tone or tone having a second frequency may be provided, which signals that the control audio signal is ending.

In particular, the external computing device may be a central computing device to which a plurality of mobile terminals, on each of which an instance of the computer program is installed, transmit their respective output signals. The external computing device may be configured as a server, for example.

The transmission of the data signal can take place, for example, via an Ethernet protocol, a TCP / IP protocol, the Internet, a wired and / or a wireless (W) LAN network. The transmission of the data signal can be secured by time-limited keys. The use of a second transmission path adjacent to the audio transmission path avoids interference, allows a larger amount of data and provides more security, since the transmission of sensitive information over the per se public audio channel is avoided. The transmission of the data signal may be dependent on a validity, such as the presence in a selection list with valid identifiers accessible to the computing device, one with the output signal transmitted identifier (serial number, IP address, etc.) of the mobile terminal are made dependent.

Likewise, a multiplicity of control devices, which may each be associated with different television and / or radio stations, each transmit different transmission time window signals to the external computing device, wherein the different transmission time window signals differ at least in the respective included identification code. This transmission can also take place in each case via an Ethernet protocol, a TCP / IP protocol, the Internet, a wired and / or a wireless (W) LAN network. For each received transmission time window signal, the external computing device, preferably automatically, each determine a corresponding transmission time window based on the respective received transmission time window signal. Thus it can be checked, for example, if and when several of the determined transmission time windows overlap each other.

The transmit time window signal may include information as to how long the corresponding transmission time window should last from the time of transmission of the transmission time window, i. a transmission time window duration. The transmit time window signal may also include a relative or absolute start time and a relative or absolute end time of the corresponding transmit time window. The transmission time window signal may also include, in addition to the identification code, only information that is a transmission time window signal.

It can be stipulated that, as a time duration for such transmission time windows whose corresponding transmission time window signals do not permit a direct determination of the transmission time window duration, by default a predetermined period of time from the transmission of the corresponding transmission time window signal is defined as the corresponding transmission time window. The predetermined period of time may, for example, be in the range of minutes or seconds, for example thirty seconds or twenty seconds. By default, a delay may also be set, such as one or two seconds, by which offset a start time of the transmit time window is set after the time of transmission of the transmit time window signal. Within this delay, for example, an adaptation control signal can be transmitted from the external computing device to the control device, based on which, for example, the control audio signal to be transmitted and / or the information audio signal to be transmitted is adaptable and / or adapted.

The output signal of the mobile terminal is advantageously a digital output signal.

The predetermined selection list can be stored in the computing device or accessible to it, for example via the Internet. It can be provided that the predetermined selection list can be adapted by means of the control device and / or by means of the computer program.

Furthermore, according to the invention, a computing device is provided, to which by means of a control device of a transmission device, a transmission time window signal can be transmitted in accordance with a transmission time window, which comprises an identification code; by means of which the transmission time window can be calculated based on the received transmission time window signal by means of the external computing device; by means of which an output signal of a mobile terminal can be received; by means of which a reception time at which the output signal of a mobile terminal was received at the external computing device can be determined; by means of which it is possible to check whether the determined time of reception of the output signal falls into at least one further transmission time window with a further identification code of a further control device, except in the determined transmission time window; and by means of which, if the determined reception time of the output signal falls only in exactly the determined transmission time window, a data signal is transmitted by the computing device to the mobile terminal, wherein the data signal to be transmitted by the computing device, preferably based on the identification code from a default selection list is automatically selectable.

Furthermore, a communication system is provided, comprising: a computing device according to the invention; a transmitting device with an antenna, by means of which a radio signal can be emitted, and with a control device, by means of which a transmission time window signal can be transmitted to the computing device; wherein the transmission time window signal comprises the identification code; and wherein a control audio signal is embedded in the radio signal; an audio reproduction apparatus, by means of which the radio signal can be received and by means of which furthermore the control audio signal can be output as sound waves; and at least one mobile terminal, by means of which the control audio signal can be received as sound waves; and by means of which the output signal based on the control audio signal can be transmitted to the computing device.

Depending on the application, the output signal may include a variety of information. That is, the electrical control signal may operate the mobile terminal and / or the computer program such that the output signal of the mobile terminal to the external computing device in accordance with the control signal determined Information includes. Thus, the mobile terminal may make a payment based on the control audio signal.

For example, a user may have entered for him specific data such as a name, an account number, a customer number, etc. in the computer program. The control signal may cause the output signal to include all or some of the data specific to the user.

In accordance with the control signal, the output signal may also comprise code segments of the control audio signal. The output signal may include information about when the control audio signal was received as a sound wave by the mobile terminal, such as using an internal clock of the mobile terminal. The output signal may include information about the volume or sound pressure level at which the sound waves were received. In particular, it may include information as to whether a part of an informational audio signal having a predetermined volume has been received. Thus, for example, it can be verifiable at what distance from the audio playback device the mobile terminal was located when receiving the sound waves, if it is known with what sound pressure level the audio playback device emits the sound waves.

Furthermore, it may be verifiable whether a part of the informational audio signal has been received with such a sound pressure level that the combination of the frequencies of the part of the informational audio signal and the sound pressure level of the respective frequencies lies within the human listening area. Instead of the human auditory surface, it is also possible to refer to the specific auditory surface of a specific user, which may for example be stored in the computer program. Thus, it can additionally be verified whether at the location of the mobile terminal a human user, or the mentioned specific user, could also perceive the informational audio signal. Verifying the reception of the informational audio signal can thereby become even more precise. Advantageously, the mobile receiving device may be wearable or implantable at an ear, near an ear or in an ear of the user.

For example, the informational audio signal may include instructions to the user of the mobile terminal that the user is to follow. If the user does not follow these instructions, it may be verifiable whether the user must have heard the instructions. Such a method for verifying the reception of the information audio signal can be used, for example, in prison. For example, a person in custody or house arrest can permanently wear a mobile terminal according to the invention. Thereby, it can be verifiable whether the person has perceived an information audio signal outputted by an audio reproducing apparatus such as a prison announcement system.

A plurality of control audio signals may be embedded in the information audio signal, for example a radio program, for example at predetermined time intervals from one another, for example every 10 minutes. Each of the control audio signals can operate the mobile terminal such that a code segment different for each control audio signal is stored in a memory device of the mobile terminal. Each stored code segment can be transmitted in a single output signal to the external computing device. Alternatively, even when a certain number of different code segments are reached, the number of code segments can be transmitted as part of the output signal to the external computing device. Thus, for example, it may be verifiable that a specific user of the mobile terminal has listened to the radio station for a certain time. The specific user can start an app on his mobile phone as a mobile device, in which he has previously entered his user data. The user data is transmitted in whole or in part as part of the output signal.

The external computing device may be a central server to which a plurality of mobile terminals according to the invention transmits the output signal. The server determines a number of the received code segments for each specific user and generates further control signals based thereon. The method according to the invention can thus be used within the scope of a loyalty program for a radio transmitter.

If the control audio signal is deliberately superimposed, for example, on an advertisement output as part of the informational audio signal, it can be verifiable whether a specific user has heard this advertisement. In particular, the external computing device further verifiable how many users have heard this advertising.

The electronic control signal may also operate the mobile terminal such that the mobile terminal displays on a display device of the mobile terminal a hyperlink to an Internet page specified in the electronic control signal and makes it available to a user of the mobile terminal. For example, it may be a hyperlink to a download or to a product description or product offering act. The output of the mobile terminal may include information as to whether and when the hyperlink was used.

Advantages of the invention

The idea underlying the present invention is to use a radio signal transmitted control audio signal to determine a mobile terminal and a data signal to be transmitted to the mobile terminal.

In this case, a particularly high reliability is achieved by the fact that it is determined in a technically simple way as possible, whether a mobile terminal has received the control audio signal. For this purpose, the external computing device by means of the transmission time window signal temporal parameters of the transmission time window, ie start time, end time and / or duration, explicitly or implicitly announced.

Audio signals are typically superimposed by other environmental sounds. The transmission of information over the audio channel, such as a control audio signal, is therefore susceptible to interference. In order to minimize their effects, the data volume transferred in this way is kept as small as possible within the scope of the inventive communication method. This is possible by holding all the information to be transmitted in the predetermined selection list on the computing device and at least linked to the identification code.

If only a single transmission time window is open at the time the control audio signal is received, that is to say currently only one control audio signal is transmitted, then the reception of the output signal of the mobile terminal based on the control audio signal can be effected solely by the external Calculating device already be concluded that exactly the control audio signal has been received, which corresponds to this single transmission time window. The external computing device can then transmit to the mobile terminal exactly that data signal which, according to the predetermined selection list, which is available to the external computing device, is linked to the identification code contained in the transmission time window signal.

It can be dispensed with a technically complex evaluation of further contents of the output signal - it is sufficient as the verification that it is an output signal and information from which mobile device or from which instance of the app, the output signal was transmitted. For example, a serial number or an IP address of the mobile terminal or a serial number of the app, ie the computer program installed on the mobile terminal, can be transmitted automatically and / or on request as part of the output signal to the external computing device.

Thus, control output signals with a particularly low data volume, for example of only one bit, can be sent out, wherein different numerical values of the bit are linked to different control devices, serial numbers of a software and / or radio and / or television transmitters.

If a plurality of transmission time windows are open at the same time, ie if several control audio signals are active at the same time, further advantageous technically simple method steps can be carried out in order to reliably determine which data signal is to be transmitted to which mobile terminal, as described in more detail below.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a preferred embodiment, the communication method according to the invention comprises, if the determined reception time except in the determined transmission time window in at least one further transmission time window with another identification code of another control device, the following steps: Check by the external computing device, whether a reference code can be determined from the received output signal; wherein, if the reference code can be determined from the received output signal, the following steps are further performed: evaluating the output signal received at the external computing device to determine the reference code by means of the external computing device; and transmitting the data signal by the external computing device to the mobile terminal, wherein the data signal to be transmitted is selected by the external computing device based on the determined reference code from the predetermined selection list.

The reference code can advantageously be identical in content to the identification code. The reference code, as well as the identification code, for example, a control device, an instance of software, a radio and / or television station, etc. index. The predetermined selection list can use the reference code instead of the identification code to determine which data signal is to be transmitted to the mobile terminal. For example, to prove abuse, the reference code and the identification code can also be used compared with each other, wherein only in a partial or complete match the data signal is transmitted to the mobile terminal.

Alternatively, the reference code and the identification code, even if they index about the same control device, the same instance of software, the same radio and / or television, may be designed differently. In this case, one and the same data signal to be transmitted can be linked both to the correspondingly formed reference code and to the correspondingly formed identification code in the predetermined selection list.

According to a further preferred development, the reference code is always comprised by the control audio signal. This increases the reliability of the process.

According to a further preferred development, the communication method further comprises the step: checking, by means of the external transmitting device, whether the determined transmission time window intersects with the at least one further transmission time window; if so, the external sending device transmits an adjustment control signal comprising the reference code to the control device of the sending device; wherein the controller adjusts the radio signal to be transmitted in response to the transmitted adjustment control signal such that the control audio signal comprises the reference code. Thus, the data volume of the control audio signal can be reduced by having the control audio signal include the reference code only when needed. The reference code may be predetermined or consist of a dynamically generated reference or include a dynamically generated reference.

According to a further preferred embodiment, the communication method, if the determined reception time except in the determined transmission time window still falls in at least one further transmission time window with a further identification code of another control device and if also the reference code from the received output signal can not be determined or is not included in the received output signal, comprising the steps of: determining position information of the mobile terminal including a position of the mobile terminal at a time of receiving the control audio signal by the microphone of the mobile terminal; and transmitting the data signal by the external computing device to the mobile terminal, wherein the data signal to be transmitted is selected by the external computing device based on the determined position information from the predetermined selection list.

The location of the mobile terminal can be determined, for example, by a position-determining device, for example by means of GPS, of the mobile terminal and transmitted to the computer program product. The location can also be transmitted as part of the output signal to the external computing device. Based on the location, the external computing device can also select additional content and transmit it to the mobile device. The position information may indirectly serve to index, for example, a radio and / or television transmitter, as part of which the radio signal has been transmitted, for example if it is known that two radio and / or television transmitters which emit radio signals in overlapping time windows non-overlapping local regions are receivable. In particular, the position information may include or consist of the position of the mobile terminal at a time of receiving the control audio signal by the microphone of the mobile terminal.

The determination of the position information of the mobile terminal can take place by means of the mobile terminal and furthermore the step can be carried out: transmission of the ascertained position information of the mobile terminal by the mobile terminal to the external computing device.

The determined position information can always be transmitted as part of the output signal.

Alternatively or additionally, if the determined reception time except in the determined transmission time window still falls in at least one further transmission time window with a further identification code of another control device and if also the reference code from the received output signal can not be determined, the external computing device transmitting a position information request signal to the mobile terminal in response to which the mobile terminal performs determining the position information of the mobile terminal and transmitting the determined position information of the mobile terminal to the external computing device. By transmitting the position information only as needed as part of the output signal, a data volume of the output signal can be kept small.

The determination of the position information of the mobile terminal can be based on the Global Positioning System, GPS, and / or by geolocalization based on a current IP address of the mobile terminal and / or by detecting an electromagnetic position signal in the environment of the mobile terminal and / or by manually scanning a location-based code using the mobile terminal. For example, a user of the mobile terminal be instructed by the mobile terminal, such as the activated app, and / or the information audio signal and / or based on the control audio signal, a specific location-related code, such as a QR code, in its immediate vicinity by means of the mobile terminal to scan. In shopping centers, alternatively, geo-localization or electromagnetic identifiers (beacons) can be used. Ideally, the detection of the position information of the mobile terminal requires little or no intervention by the user. A description of the location by the scan of a code or the explicit input are further ways to determine the position information.

According to a further preferred development of the communication method, the transmission time window signal comprises information about a duration of the transmission time window and / or information about a start time of the transmission time window and / or information about an end time of the transmission time window.

According to a further preferred development, the data signal to be transmitted is selected by the external computing device based on the identification code from the transmit time window signal and / or based on the output signal from the predetermined selection list.

According to a further preferred refinement, a feedback signal is automatically generated on the basis of the output signal transmitted to the external computing device by means of the external computing device and transmitted to the control device; wherein the controller is automatically operated based on the transmitted feedback signal. The feedback signal can in particular be transmitted via the Ethernet protocol, the Internet, a wired and / or a wireless (W) LAN network.

For this purpose, for example, the external computing device may be connected to the transmitting device via a control line. If, for example, a predetermined first number of code segments is received by a predetermined second number of different mobile terminals by means of the external computing device, the computing device can transmit a control signal to a control device of the transmitting device. Based on this control signal, the control device can be operated, in particular automatically, in such a way that a different control audio signal and / or another information audio signal is transmitted than before the transmission of the control signal. For example, a radio station can automatically and specifically respond to listener quotas represented by the second number of different mobile terminals by changing a radio program. If, for example, evaluations about the acoustic intelligibility of the information audio signal are collected by the computing device, a transmission quality of the transmission device can be automatically improved based on this.

The transmitted output signal may also include user data about the user of the respective mobile terminal, such as an age of the user. The automatic modification of the radio program can also be based on this user data, which can be collected and evaluated by the external computing device for a large number of mobile terminals. For example, an age structure of the users can be determined and, based on the determined age structure, the radio program can be changed automatically. A control device of the transmitter of the radio signal may have predetermined decision rules, for example in a memory connected to the control device. The decision rules may determine which segments of the information audio signal are to be sent based on, for example, the particular age structure or also based on information about whereabouts of the mobile terminals.

The computing device according to the invention and the communication system according to the invention are used in particular for carrying out the communication method according to the invention and can be correspondingly adapted to all variants and further developments of the communication method according to the invention.

According to a preferred embodiment, the output signal includes information about the mobile terminal. Alternatively or additionally, the output signal may also include information about a serial number of the computer program product installed on the mobile terminal. The serial number and / or the information about the mobile terminal can be stored on the external computing device, advantageously in each case in connection with user data of a user, for example a name or a customer number. Thus, an even more accurate assignment is possible, which instance of the computer program product or which mobile terminal has received the audio signals.

According to a further preferred development, the control audio signal is completely or partially converted into an electrical control signal by means of a computer program installed on the mobile terminal, and the mobile terminal is operated based on the electrical control signal. By means of the electrical control signal, the mobile terminal can be operated such that at least one code segment contained in the control signal is stored in a memory device of the mobile terminal. The code segment - or a predetermined number of code segments of any or predetermined type - may also be communicable to a receiver. The code segment may be, for example, an authorization code segment or a token.

According to a further preferred development, the output signal comprises at least one code segment contained in the control signal. The code segment can thus be used, for example, as reception detection of a specific part of any informational audio signal, that is to say for verification of the reception. In response to transmitting the output signal to the external computing device, the computing device may send to the mobile terminal an authorization code segment called a token.

The entitlement code segment may entitle the user of the mobile terminal to purchase a good or service, such as entry into an event or purchase of value units commonly used on the Internet, such as the Internet. so-called bitcoins. The proof of authorization can be carried out by means of a test device which is designed to read the token from the mobile terminal, to verify its authenticity, for example by means of a request to the external computing device. The checking device may be another mobile terminal on which another computer program product is executed. The testing device may also be part of the communication system according to the invention.

If the product or service is obtained by means of the token, the testing device can send out an authorization destruction signal to the mobile terminal and / or to the external computing device. Upon receipt of the entitlement destruction signal, the entitlement code segment or token may be destroyed or invalidated by the computing device, or due to a control signal of the computing device to the mobile terminal by the mobile terminal.

According to a further preferred development, the control audio signal comprises a tone sequence which is converted into a character string by the computer program product in accordance with a multi-frequency selection process. The code segment included in the control signal comprises the string. The frequencies used for DTMF dialing may all be audible, all non-audible, some audible and some non-audible. The tone sequence can last for example between 1 and 60 seconds, advantageously between 1 and 20 seconds, in particular between 2 and 10 seconds.

If it suffices for the purpose that the control audio signal A2 comprises only digit strings as strings, it may be used, for example, as the known multi-frequency dialing method for telephones for coding the digits of 1-9, 0 and *, # and A-D. Thus, overlays of two frequencies each can be used to encode a digit or a letter. If strings with more different characters are to be encoded, a multi-frequency selection method with a superposition of more than two frequencies, for example three frequencies, can also be used. Thus, for example, 3x3x3 frequencies could be defined by which all letters of the alphabet could be encoded.

According to a further preferred development, the output signal is furthermore based on a user input of a user into the mobile terminal. For example, the output signal may comprise user data of the user which the user has entered as user input into the mobile terminal, such as a name, a customer number, payment information, position information, etc. The user input may also include control instructions which may specify based on which electrical control signals the mobile terminal to be operated in what way. For example, the user may enter that he wants additional information, whereupon the output signal may include an information request signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures of the drawings. Show it:

1 a schematic flowchart for explaining a communication method according to a first embodiment of the present invention;

2A and 2 B schematic diagrams of transmission time window signals for explaining the communication method according to the first embodiment of the present invention;

3 a schematic representation of a communication system according to the invention for carrying out a communication method according to the invention according to the first embodiment of the present invention;

4 a schematic representation of a communication system according to the invention for carrying out a communication method according to the invention according to a second embodiment of the present invention; and

5 a schematic representation of a communication system according to the invention for carrying out a communication method according to the invention according to a third embodiment of the present invention.

In all figures, the same or functionally identical elements and devices - unless otherwise stated - provided with the same reference numerals. Unless explicitly stated, numbering of method steps is not intended to imply temporal sequences; in particular, several method steps may also run simultaneously.

DESCRIPTION OF THE EMBODIMENTS

1 FIG. 12 is a schematic flowchart for explaining a communication method according to a first embodiment of the present invention. FIG. In the description of the 1 is partly on reference numerals of the following 2A . 2 B and 3 Referenced.

In a step S01, a control device ST of a transmitting device S for transmitting a radio signal FS within a transmission time window ZF1 is operated as electromagnetic waves EMW by means of an antenna A of the transmitting device S. An information audio signal A1 with frequencies in an audible first frequency range is embedded in the radio signal FS. The radio signal FS is emitted in particular as a modulated electromagnetic wave with a wavelength typical for radio signals.

According to the first embodiment, the informational audio signal A1 is a common audio signal of a radio channel and includes, in particular, music and / or human speech. In the radio signal FS, a control audio signal A2 is further embedded with frequencies in a second frequency range. The control audio signal is transmitted only within the limited transmission time window ZF1, e.g. of 20 seconds duration. The control audio signal A2 can only be received and used by those whose mobile terminal and / or an app (computer program) installed on the mobile terminal is activated within the transmission time window ZF1, as will be explained in more detail below. According to the first embodiment, the control audio signal A1 always comprises a reference code C1, which indexes the control device ST of the transmitting device S. That is, based on the reference code C1, the transmitting device S and thus a radio station (or radio channel, radio station, TV station, company, legal or natural person etc.) associated with the transmitting device S can be identified. The control audio signal is transmitted only during the transmission time window. Advantageously, the control audio signal is sent out over the entire transmission time window ZF1.

According to the first embodiment, the reference code C1 comprises one bit, i. a numerical value between 1 and 255. Each numerical value stands for a different control device ST, wherein the control devices are associated with radio stations. For example, the numerical value "1" of the reference code could indicate a first radio station, the numerical value "2" of the reference code C1 a second radio station, etc. The control devices may in particular be instances of software which is available to the radio stations and which are each set up in each case to use the reference code corresponding to the radio station. As a reference code, alternatively, a previously known serial number of the computing device of the software can be used.

In a step S02, the control device ST of the transmitting device S for transmitting a transmission time window signal D1 corresponding to the transmission time window ZF1 to an external computing device 30 operated, wherein the transmission time window signal D1 comprises an identification code C2. According to the first embodiment, the identification code C2 is identical to the reference code C1.

2A On an ordinate Y of a graph is an activity state of transmission time windows, that is active (transmission time window open) or inactive (transmission time window closed) and a time plotted on an abscissa X of the graph. According to the first embodiment, the transmission time window ZF1 is kept active from a first transmission time-window start time t1s to a first transmission time-window end time t1e, and otherwise kept inactive.

In a step S03, the radio signal FS is transmitted by means of an audio reproducing apparatus 20 receive. According to the first embodiment, the audio reproducing apparatus is 20 a radio, such as a kitchen radio.

In a step S04, by means of the audio reproducing apparatus 20 the information audio signal A1 and the control audio signal A2 by the audio reproducing apparatus 20 output as sound waves SW.

The information audio signal A1 and the control audio signal A2 are reproduced superimposed as sound waves according to the first embodiment. According to the first embodiment, the information audio signal A1 is superimposed with a sound sequence as the control audio signal A2. Advantageously, this can be done while the information audio signal A1 has a relatively quiet volume level.

Advantageously, a plurality of different tone sequences of one or more control audio signals A2 may be cycled e.g. are issued shortly before commercials. By limiting the duration and frequency of the control audio signals, along with charging a premium for a desired set of control audio signals, the listener may be incentivized to be present during certain broadcasts.

In a step S05, the information audio signal A1 and the control audio signal A2 are transmitted as sound waves SW through a microphone 12 a mobile terminal 10 of a user N received.

In an optional step S06, the control audio signal A2 is transmitted by the mobile terminal 10 by means of one on the mobile terminal 10 installed computer program converted into an electrical control signal.

According to the first embodiment, a character sequence is coded in the tone sequence of the control audio signal A2 by means of a multi-frequency selection method. In converting S06 of the control audio signal A2, the tone sequence is converted back into the character string as an electrical control signal by the computer program in accordance with the multi-frequency selection process.

In converting S06, the computer program may be stored in a memory device 18 of the mobile terminal 10 access stored tax rules. The conversion S06 of the control audio signal A2 to the electrical control signal may be made in accordance with these control rules. According to the first embodiment, the computer program recognizes that a control audio signal A2 has been received by passing it through the microphone 12 stores received sound waves SW and compares with parameters defined in the control rules. These parameters include the frequencies used in the multi-frequency selection method according to the first embodiment. As a result, for example by means of a processor device 14 of the mobile terminal 10 on which the computer program is executed, the control audio signal A2 is isolated from the information audio signal A1.

According to the first embodiment, it is further provided that in a step S07 in accordance with the stored control rules as part of the computer program, the character string as part of an output signal A3 to a central server as an external computing device 30 is transmitted. Thus, to the external computing device 30 communicates, that is, transmits information that a reception of at least a part of the informational audio signal A1 by the mobile terminal 10 took place. This is at least the part to which the control audio signal A2 is superimposed. The listener is typically alerted to the impending broadcast of a control audio signal A1 by an audible indication in the information audio signal A1, or in the form of a typical signal ("jingle"), and subsequently activates its instance of the computer program (App ). Activation establishes a connection between the computing device 30 and the mobile terminal 10 produced.

In a step S08, the transmission time window ZF1 is determined based on the received transmission time window signal D1 by means of the external computing device 30 determined. According to the first embodiment, the transmission time window signal D1 contains information about the absolute transmission time window start time t1s of the transmission time window ZF1, for example 15:10:00 o'clock and the absolute transmission time window end time t1e of the transmission time window ZF1, for example 15 : 10: 20 clock.

In a step S09, a reception timing t3 at which the output signal A3 at the external computing device (FIG. 30 ) was detected.

In a step S10, it is checked whether the determined reception time t3 of the output signal A3 falls in more than one determined transmission time window. In the graph in 2A At the time of reception t3 of the output signal A3, only the determined time window ZF1 is active. Thus, the determined reception time t3 of the output signal A3 falls only in exactly the determined transmission time window ZF1.

If the determined reception time of the output signal A3 falls only in exactly the determined transmission time window ZF1 (arrow "no" in 1 ), in a step S11, a data signal D2 by the external computing device 30 to the mobile device 10 transmitted, wherein the data signal D2 to be transmitted by the external computing device 30 is selected based on the identification code C2 from a predetermined selection list.

In the graph in 2 B which is in the same coordinate axes as the graph in FIG 2A , another situation is described. There For example, based on a further transmission time window signal of a further control device, a further transmission time window ZF2 was determined, for example by means of the computing device 30 , The second transmission time window ZF2 is kept active from a second transmission time window start time t2s to a second transmission time window end time t2e and otherwise kept inactive. The determined transmission time window ZF1 and the further determined transmission time window ZF2 overlap between the second transmission time window start time t2s and the first transmission time window end time t1e.

If the determined reception time t4 of the output signal A3 falls into more than one determined transmission time window ZF1, ZF2 (arrow "yes" in FIG 1 ), is checked in a step S12, for example automatically by the external computing device, whether a reference code C1 can be determined from the received output signal A3. The reference code C1 could not be determined from the output signal A3, for example, if it was not contained there or if the control audio signal A2 by means of the mobile terminal 10 was received incomplete or with low audio quality and the reference code C1, for example, is undesirably incomplete.

Depending on whether this is the case or not, the process continues in different ways:
If the reference code C1 can be determined from the received output signal A3 (arrow "yes" in FIG 1 ), in a step S13 becomes the external computing device 30 received output signal A3 for determining the reference code C1 by means of the external computing device 30 evaluated; and in a step S14, the data signal D2 is acquired by the external computing device 30 to the mobile device 10 transmitted, wherein the data signal D2 to be transmitted by the external computing device 30 is selected based on the determined reference code C1 from the default selection list.

If the reference code C1 can not be determined from the received output signal A3 (arrow "no" in FIG 1 ), a position information POS of the mobile terminal is obtained in a step S15 10 determined. The position information POS includes a position of the mobile terminal 10 at a time of receiving S05 of the control audio signal A2 through the microphone 12 of the mobile terminal 10 ,

In a step S16, the determined position information POS of the mobile terminal 10 through the mobile terminal 10 transmitted via the Internet to the external computing device.

In a step S17, the data signal D2 is output by the external computing device 30 over the internet to the mobile terminal 10 transmitted, wherein the data signal D2 to be transmitted by the external computing device 30 is selected based on the determined position information POS from the default selection list.

Optionally, further based on the to the external computing device 30 transmitted output signal A3 by means of the external computing device 30 automatically generates a feedback signal F2 and transmitted to the control device ST. The control device ST is operated automatically based on the transmitted feedback signal F2.

3 shows a schematic representation of a communication system according to the invention for carrying out the communication method according to the invention according to the first embodiment.

The functions and interaction of in 3 illustrated elements and features of the communication system according to the invention are above with respect to the inventive communication method according to the embodiment described above in connection with 1 described in detail by way of example. Clearly, the communication system can also be adapted or used by a person skilled in the art for the multiplicity of variants of the communication system according to the invention, as described in this document.

Although in 3 just a single mobile device 10 is illustrated, it should be understood that the inventive communication method and the communication system according to the invention in particular for a variety of mobile terminals 10 can be used, which their respective output signal A3 to one for all mobile devices 10 common, external computing device 30 to transfer.

3 shows the transmitting device S, which has the antenna A and connected to the antenna A control device ST of the antenna A. By means of the transmitting device S, the radio signal FS is emitted as electromagnetic wave EMW. In the radio signal FS are embedded the information audio signal A1 with the frequencies in the audible first frequency range and the control audio signal A2 with the frequencies in the second frequency range.

By means of the audio playback device 20 the radio signal FS can be received and the information audio signal A1 and the control audio signal A2 of the radio signal FS can be output as sound waves. The communication system has a mobile terminal according to the invention 10 on. Furthermore, the Communication system, a computing device according to the invention 30 to which the at least one output signal A3 of the at least one mobile terminal 10 is transferable.

4 shows a schematic representation of a communication system according to the invention for carrying out a communication method according to a second embodiment.

The communication method according to the second embodiment is a variant of the communication method according to the first embodiment, and differs therefrom, in particular, in that the control audio signal A1 does not always include the reference code C1.

Rather, according to the second embodiment, after receiving the transmission time window signal D1 by means of the computing device 30 calculating S08 of the transmission time window is performed based on the received transmission time window signal D1. Furthermore, the determined transmission time window is compared with other, predetermined transmission time windows and checks whether the determined transmission time window overlaps in time with at least one of the other transmission time windows. For example, the other transmit time windows may have been previously determined based on other transmit time window signals or deposited directly in a memory of the computing device or otherwise made accessible to the computing device.

If it is determined that the determined transmission time window completely or partially overlaps with at least one other transmission time window, by means of the computing device 30 automatically transmits a control adjustment signal F1 to the control device ST. The control adjustment signal F1 includes the reference code C1. In response to the transmitted adaptation control signal F1, the control device ST automatically adjusts the radio signal FS to be transmitted such that the control audio signal A2 comprises the reference code C1. This can be done before or during the transmission of the control audio signal A1 as part of the radio signal FS.

According to the second embodiment, no feedback signal F2 is transmitted, but this can optionally also be provided.

5 shows a schematic representation of a communication system according to the invention for carrying out a communication method according to a third embodiment.

The communication method according to the third embodiment is a variant of the communication method according to the first embodiment and differs therefrom in that the output signal A3 does not always include the determined position information POS.

Instead, according to the third embodiment, by means of the external computing device 30 a position information request signal QPOS to the mobile terminal 10 transmitted. In response to the position request signal QPOS, the mobile terminal transmits 10 its current position and / or its position at the time of receipt of the control audio signal A1 to the external computing device 30 ,

The position information request signal QPOS can be transmitted, in particular, if the determined reception time falls within more than a determined transmission time window and if, in addition, the reference code C1 can not be determined from the received output signal A3. The position information request signal QPOS can alternatively or additionally be transmitted, however, if the data signal A2 to be transmitted depends on the position of the mobile terminal. For example, it can be determined from the reference code C1 that the control audio signal of a first radio station has been received. A first data signal may be transmitted to users who have received the control audio signal of the first radio station in a first area, while a second data signal may be transmitted to users who have received the same control audio signal of the first radio station in a second area. The first and second data signal may, for example, be a voucher for, or an information about, a locally offered service.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

If the receiving of the radio signal FS, for example, by a digital radio receiving device as an audio playback device 20 , the radio signal FS emitted by the transmitting device S can be wholly or partially tuned to an individual user or to an individual instance of the computer program. The control audio signal A2 can therefore be converted into the electrical control signal in different ways, for example, based on a serial number of the computer program.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1906696 A1 [0005]

Claims (14)

Communication method comprising the steps of: operating (S01) a control device (ST) of a transmitting device (S) for transmitting a radio signal (FS) within a transmission time window (ZF1, ZF2) by means of an antenna (A) of the transmitting device (S), wherein the radio signal (FS) is embedded with a control audio signal (A2); Operating (S02) the control device (ST) of the transmitting device (S) for transmitting a transmission time window signal (D1) corresponding to the transmission time window (ZF1, ZF2) to an external computing device ( 30 ), wherein the transmission time window signal (D1) comprises an identification code (C2); Receiving (S03) the radio signal (FS) by means of an audio reproduction device ( 20 ); Outputting (S04) the control audio signal (A2) as sound waves (SW) by means of the audio reproduction device ( 20 ); Receiving (S05) the control audio signal (A2) as sound waves (SW) through a microphone ( 12 ) of a mobile terminal ( 10 ) of a user (N); Transmitting (S07) an output signal (A3) based on the control audio signal (A2) of the mobile terminal ( 10 ) to the external computing device ( 30 ); Determining (S08) the transmission time window (ZF1, ZF2) based on the received transmission time window signal (D1) by means of the external computing device ( 30 ); Determining (S09) a reception time at which the output signal (A3) at the external computing device ( 30 ) was received; and checking (S10) whether the determined reception time (t3, t4) of the output signal (A3) in addition to the determined transmission time window (ZF1, ZF2) in at least one further transmission time window (ZF2, ZF1) with another Identification code of another control device falls; wherein, if the detected reception timing (t3) of the output signal (A3) falls within only the determined transmission time window (ZF1, ZF2), the following step is performed: transmitting (S11) a data signal (D2) by the external computing device ( 30 ) to the mobile terminal ( 10 ), wherein the data signal (D2) to be transmitted by the external computing device ( 30 ) is selected from a given selection list. The communication method according to claim 1, wherein, if the detected reception time (t4) falls outside of the determined transmission time window (ZF1, ZF2) or at least one further transmission time window (ZF2, ZF1), the following steps are performed: Checking (S12) whether a reference code (C1) can be determined from the received output signal (A3); wherein, if the reference code (C1) can be determined from the received output signal (A3), the following steps continue to be carried out: evaluating (S13) that of the external computing device (S13) 30 ) received output signal (A3) for determining the reference code (C1) by means of the external computing device ( 30 ); and transmitting (S14) the data signal (D2) by the external computing device ( 30 ) to the mobile terminal ( 10 ), wherein the data signal (D2) to be transmitted by the external computing device ( 30 ) is selected based on the determined reference code (C1) from the predetermined selection list.  The communication method according to claim 2, wherein the reference code (C1) is always included in the control audio signal (A2). Communication method according to claim 2, comprising the following steps: checking, by means of the external transmitting device ( 30 ), whether the determined transmission time window (ZF1, ZF2) intersects with the at least one further transmission time window (ZF1, ZF2); if so, the external transmitting device ( 30 ) transmits an adaptation control signal (F1) comprising the reference code (C1) to the control device (ST) of the transmitting device (S); wherein the control means (ST) in response to the transmitted adjustment control signal (F1), the radio signal (FS) to be transmitted in such a way adapted that the control audio signal (A2) comprises the reference code (C1). Communication method according to one of the preceding claims 2 to 4, wherein, if the determined reception time (t3) except in the determined transmission time window (ZF1, ZF2) still in the at least one further transmission time window (ZF2, Zf1) falls and if in addition, the reference code (C1) can not be determined from the received output signal (A3) or is not contained in the received output signal (A3), the following steps are performed: determining (S15) a Position information (POS) of the mobile terminal (POS) 10 ) representing a position of the mobile terminal ( 10 ); and transmitting (S17) the data signal (D2) by the external computing device ( 30 ) to the mobile terminal ( 10 ), wherein the data signal (D2) to be transmitted by the external computing device ( 30 ) is selected based on the determined position information (POS) from the given selection list. A communication method according to claim 5, wherein determining the position information (POS) of the mobile terminal (POS) 10 ) by means of the mobile terminal ( 10 ) and wherein the step is further carried out: transmitting (S16) the determined position information (POS) of the mobile terminal ( 10 ) by the mobile terminal ( 10 ) to the external computing device ( 30 ).  Communication method according to claim 6, wherein the determined position information (POS) is always transmitted as part of the output signal (A3). Communication method according to claim 6, wherein, if the determined reception time (t4) except in the determined transmission time window (ZF1, ZF2) still in the at least one further transmission time window (ZF2, ZF1) falls and if, in addition, the reference code (C1 ) is not determinable from the received output signal (A3), the external computing device sends a position information request signal (QPOS) to the mobile terminal ( 10 ) in response to which the mobile terminal ( 10 ) determining (S15) the position information (POS) of the mobile terminal ( 10 ) as well as the transmission (S16) of the determined position information (POS) of the mobile terminal ( 10 ) to the external computing device ( 30 ). Communication method according to one of the preceding claims 5 to 8, wherein the determining ( 15 ) the position information (POS) of the mobile terminal ( 10 ) based on the Global Positioning System, GPS, and / or by geolocation based on a current IP address of the mobile device ( 10 ) and / or by detecting an electromagnetic position signal in the environment of the mobile terminal ( 10 ) and / or by a manual scanning of a location-related code by means of the mobile terminal ( 10 ) he follows.  Communication method according to one of the preceding claims 1 to 9, wherein the transmission time window signal (D1) information about a duration of the transmission time window (ZF1, ZF2) and / or information about a start time (t1s, t2s) of the transmission time window (ZF1, ZF2) and / or information about an end time (t1e, t2e) of the transmission time window (ZF1, ZF2). Communication method according to one of the preceding claims 1 to 10, wherein based on the to the external computing device ( 30 ) transmitted output signal (A3) by means of the external computing device ( 30 ) automatically generates a feedback signal (F2) and is transmitted to the control device (ST); and wherein the control device (ST) is operated automatically based on the transmitted feedback signal (F2). Communication method according to one of the preceding claims 1 to 11, wherein the data signal (D2) to be transmitted by the external computing device ( 30 ) is selected based on the identification code (C2) from the transmission time window signal (D1) and / or based on the output signal (A3) from the predetermined selection list. Computing device, to which by means of a control device (ST) of a transmitting device (S) a transmission time window signal (D1) corresponding to a transmission time window (ZF1, ZF2) can be transmitted, which comprises an identification code (C2); by means of which the transmission time window (ZF1, ZF2) based on the received transmission time window signal (D1) by means of the external computing device ( 30 ) can be determined; by means of which an output signal (A3) of a mobile terminal ( 10 ) is receivable; by means of which a reception time (t3, t4) at which the output signal (A3) of a mobile terminal ( 10 ) on the external computing device ( 30 ), is determinable; by means of which it is possible to check whether the determined reception time (t3, t4) of the output signal (A3), in addition to the determined transmission time window (ZF1, ZF2), in at least one further transmission time window (ZF2, ZF1) with a further identification code another control device falls; and by means of which, if the detected reception time (t3) of the output signal (A3) not in the determined transmission time window (ZF1, ZF2) nor in at least one further transmission time window (ZF2, ZF1) with a further identification code another Control device falls, a data signal (D2) by the computing device ( 30 ) to the mobile terminal ( 10 ) is transferable, wherein the data signal to be transmitted (D2) by the computing device ( 30 ) is automatically selectable from a given selection list. Communication system comprising: a computing device ( 30 ) according to the preceding claim 12; a transmitting device (S) with an antenna (A), by means of which a radio signal (FS) can be emitted and with a control device (ST), by means of which the transmission time window signal (D1) to the computing device ( 30 ) is transferable; wherein the transmission time window signal (D1) comprises the identification code (C2); and wherein a control audio signal (A2) is embedded in the radio signal (FS); an audio playback device ( 20 ), by means of which the radio signal (FS) can be received and by means of which furthermore the control audio signal (A2) can be output as sound waves; and at least one mobile terminal ( 10 ), by means of which the control audio signal (A2) can be received as sound waves (SW); and by means of which the output signal (A3) is sent to the computing device based on the control audio signal (A2) ( 30 ) is transferable.

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