WO2008015244A1

WO2008015244A1 - Method, transmitter, receiver, and time measurement generator for the chronological synchronizing of a first and a second data stream at a synchronization point of time

Info

Publication number: WO2008015244A1
Application number: PCT/EP2007/057980
Authority: WO
Inventors: Jörg Heuer; Martin Winter
Original assignee: Nokia Siemens Networks Gmbh & Co. Kg
Priority date: 2006-08-03
Filing date: 2007-08-01
Publication date: 2008-02-07

Abstract

The invention relates to a method for the chronological synchronization of a first and a second data stream at a synchronization point of time, comprising a transmitter having a counter status on the transmitter side, a receiver having a counter status on the receiver side, and a time measurement generator having a counter status on the generator side, wherein the respective counter statuses upon the lapse of a time interval are each increased by one counter unit, in which a synchronization frequency point in the second data stream is detected each by means of the transmitter, the receiver, and the time measurement generator on the basis of a property characteristic of the second data stream, the counter status allocated to the synchronization reference point at the generator side is transmitted to the transmitter and the receiver, and the transmitted counter status on the generator side is assigned to the counter status on the transmitter side, and the counter status of the receiver side at the time of detecting the synchronization reference point, a reference counter status of the counter status on the transmitter side is set, at which second data stream will reach the synchronization time, the reference counter status is transmitted by the transmitter to the sender, and the reference counter status received by the transmitter is analyzed such that the first data stream is synchronized with the second data stream at that time, at which the counter status ZE on the transmitter side reaches at least the counter status RZ on the receiver side. Further, the invention comprises the transmitter, the receiver, and the time measurement generator for performing the method.

Description

description

Method, transmitter, receiver and timing generator for timing synchronization of a first and a second data stream at a synchronization time

The invention relates to a method, a transmitter, a receiver and a time measurement generator for temporally synchronizing a first and a second data stream at a synchronization time.

An end user should be offered an additional service in addition to a television program transmitted via a broadcast service. The additional services are, for example, a fade-in of an advertising banner for a ringtone call via SMS (SMS Short Message Service). The broadcast service can be transmitted via DVB-T (DVB - Digital Video Broadcast, T - Terrestrial). In this case, a time, for example a start or an end, of the additional service must be synchronized in time with a specific location and / or scene within the television program. The broadcast and supplementary services are often provided by different service providers.

Currently, the following three approaches to time synchronization are known:

(a) Use of a release time of a movie of the broadcasting service to determine the beginning of the additional service. Such an approach is known by a name NPT in the MHP standard (NPT - Normal Playing Time, MHP - Multimedia Home Format). For NPT, reference is made to ISO / IEC 13818-6 and for MHP to ETSI TS 102812. This approach can not be used if the supplementary service and the broadcast service are provided by different service providers because the service provider of the Additional service does not have access to the broadcast service.

(b) A second approach uses an external time reference, such as a time of the normalized time signal DCF -77, the radio time signal of the Physikalisch Technische Bundesanstalt of the FRD, a specific location and / or scene within the movie of the broadcast service with a exak - Defined time. This second approach is not accurate in digital broadcast services, such as DVB-T, because both transmission time and caching of information from the respective services may vary.

(c) A third approach is from a project called Sharemark, see http: / / vdrsync. vdr portal. de / sharemarks / known. Thereby, a time of presentation, i. PTS (Presentation Time Stamp), used to identify a time within the feature film of the broadcast service. The time of presentation is used directly and not assigned to any other timeline. In addition, this project does not support real time or near real time synchronization.

The invention has for its object to provide a method and a system that allows a temporal synchronization of a content of a broadcast service and a content of an additional service of different service providers and avoids the disadvantages mentioned.

This object is solved by the independent claims. Other developments of the invention are given in the dependent claims. The invention relates to a method for temporally synchronizing a first and a second data stream at a synchronization time, which comprises a transmitter with a transmitter-side counter reading, a receiver with a receiver-side counter reading and a time measurement generator with a generator-side counter reading the respective counter readings are increased at the expiration of a time interval in each case by a counting unit in which a synchronization reference point in the second data stream is detected by the transmitter, the receiver and the time measurement generator on the basis of a characteristic characterizing the second data flow, which belongs to the synchronization reference point the generator-side counter reading to the transmitter and the receiver, the transmitted generator-side counter reading the transmitting-side counter reading and the receiving-side counter reading at the time of detecting the synchronization reference point jewei ls assigned, a reference count of the transmitting-side counter reading at which the second data stream will reach the synchronization time set, the reference count transmitted from the transmitter to the receiver and the received reference count is evaluated by the receiver such that the first data stream with the second Data stream is synchronized at the time at which the receiving-side counter reading reaches at least the reference count ZE> = RZ.

It is achieved by the method that the transmitter and the receiver, which operate independently of one another, are synchronized in such a way that the first and the second data stream are synchronized, for example displayed on a screen, at the synchronization time. This synchronization can also be carried out with the aid of the method if the first and the second data stream are not transmitted in a time-synchronized manner, for example the first data stream via a first transmission channel and the second data stream via a second transmission channel. In addition, it proves to be advantageous that the receiver, that of different Service providers, the data streams can be delivered, yet the synchronization with the transmitter can accomplish. The transmitter is not to be understood in this context as a source of data streams, but rather the transmitter is a unit which provides synchronization of different data streams to the receiver with the aid of the time dimension generator. The timing generator and the transmitter may be integrated in a common unit. In this invention, synchronization is understood as an assignment of respective times of the first and of the second data stream, wherein, for example, the allocation determines a simultaneous playback of a content of the first data stream and of the second data stream defined by the respective times or an identification of temporal dependencies of the two data - Is detected currents.

Preferably, the synchronization reference point is described by the generator-side counter reading and an identification marker, and the generator-side counter reading and the identification marker are transmitted to the transmitter and / or the receiver, wherein the identification of the correct synchronization reference point from a plurality of possible synchronization reference points can be determined. With this extension, an exact determination of the synchronization reference point under several synchronization reference points is made possible.

In an extension of the method, as property, a PTS information, a physical property of a content of the second data stream, a coding of the second data stream, and / or a semantic description of a content of the second data stream are used. This makes it possible to use a number of properties for determining the synchronization reference point, it being possible to use a more complex property, such as the semantic property, depending on the available computing power. Preferably, a time difference is determined by subtracting the transmitted generator-side count from the transmitting-side count relevant at the time of detecting the synchronization reference point, and assigning the transmitted generator-side count to the transmitting-side counter by adding a time difference to the transmitting-side counter reading, with a time difference being subtracted from the transmitted counter reading generator-side count of the relevant at the time of detecting the synchronization reference point transmit-side counter reading is determined.

This preferably extension is analogously applicable to the receiving-side meter reading. Using this extension of the method makes it possible for the method to be used despite differences in transit times between generation of the generator-side counter reading and setting of the respective counter readings, e.g. because of latency in the transmission of the generator-side counter reading to the transmitter or receiver, can be used.

The invention also relates to a time-measurement generator for synchronizing a first and a second data stream at a synchronization time at a transmitter and a receiver, wherein the time-measurement generator has the following means:

a detection means for detecting a synchronization reference point in a second data stream on the basis of a characteristic characterizing the second data stream; a generator-side counter for managing a generator-side counter reading;

- Time generating means for generating the current at the time of detecting the synchronization reference point generator side count and for transmitting this counter reading to the transmitter and / or receiver. With the help of the time-dimension generator, the generation of the generator-side counter reading used for synchronizing, ie setting, the transmitter-side and / or the receiver-side counter reading, can be performed.

Preferably, the time generating means of the Zeitmaß- generator is designed such that the detected synchronization reference point generator-side count and an associated identification marker can be determined and transmitted to the transmitter and / or receiver, based on the identification marker of the correct synchronization reference point from several possible synchronization reference points can be determined. Hereby, a secure synchronization of the first and second data stream can be achieved, since an erroneous allocation of a synchronization reference point at a plurality of, e.g. timely occurring synchronization reference points, can be avoided.

The invention further comprises a transmitter for temporally synchronizing a first and a second data stream at a synchronization time at a transmitter and a receiver, wherein the transmitter has the following means:

a detection means for detecting a synchronization reference point in the second data stream on the basis of a characteristic characterizing the second data stream;

a transmitting-side counter for managing a transmitting-side counter reading; a time synchronization means for receiving a to

Time of detection of the synchronization reference point current generator-side counter reading and for assigning the received generator-side counter reading to the transmitting-side counter reading at the time of detection of the synchronization reference point;

a time stamping means for determining a reference count of the transmitting-side counter reading at which the second Data stream will reach the synchronization time, and to transmit the reference count to the receiver.

With the aid of the transmitter, the reference counter can be generated, which is evaluated by the receiver in such a way that the synchronization of the first and second data stream is started at the time at which the receiving-side counter reading reaches at least the reference counter reading ZE ≥ RZ.

Preferably, the transmitter is extended such that the detection means is formed such that in each case a transmitter-side identification marker and an associated first transmitter-side counter reading can be determined, which characterize the detected synchronization reference point, and the time synchronization means is formed such that the Detected synchronization time determined generator-side count and an associated identification marker can be generated, the identification marker and the sender-side identification mark comparable and the sendesei- tige counter reading by the generator-side count under consideration of the corresponding first sendeseitigen counter is replaceable, if the identification marker and the transmitting side Identification markers have an identical content. Hereby, a secure synchronization of the first and second data stream can be achieved, since an erroneous assignment of a synchronization reference point can be avoided.

Finally, part of the invention is a receiver for temporally synchronizing a first data stream and a second data stream at a synchronization time, the receiver comprising the following means: a detection means for detecting a synchronization reference point in the second data stream on the basis a characteristic characterizing the second data stream;

a receiving-side counter for managing a receiving-side counter reading; a time synchronization means for receiving a to

Time of detection of the synchronization reference point current generator-side counter reading and for assigning the received generator-side counter reading to the transmit-side counter reading at the time of detection of the synchronization reference point;

- A comparison means for receiving a reference count from the transmitter, wherein the reference count indicates the transmitter-side count at which the second data stream will reach the synchronization time, and for evaluating the reference count, wherein the first data stream is synchronized with the second data stream at the time the receiving-side counter reading reaches at least the reference counter reading ZE> = RZ.

After receiving the generator-side counter and the reference counter together with the determined synchronization reference point, it is possible for the receiver to determine the synchronization time and to synchronize the first and the second data stream at this time.

In an extension, the receiver preferably comprises the following means:

the detection means for generating in each case a reception-side identification marker and an associated first reception-side counter reading, which characterize the detected synchronization reference point;

the time synchronization means for receiving the generator-side counter reading and the identified identification marker (IK) determined for the detected synchronization reference point, for comparing the identification marker and the receiving-side identification mark and for assigning the generator-side counter reading to the received signal page count taking into account the first receiving-side count, if the identification marker and the receiving-side identification markers have an identical content.

This extension makes it possible for the receiver to guarantee a secure assignment of the received generator-side counter reading to the receive-side counter reading, even if several synchronization reference points occur.

The invention and its developments are explained in more detail with reference to drawings.

Show it:

Figure 1 timing of a first and second

Data stream;

Figure 2 shows a system comprising a transmitter, a receiver and a time measurement generator.

Elements with the same function and mode of operation are provided in FIGS. 1 and 2 with the same reference numerals.

Reference to the figures 1 and 2, the invention is explained in detail by means of an embodiment. FIG. 1 shows a first and a second data stream D1, D2. The second data stream corresponds to a movie of a length of, for example, 120 minutes. The feature film will be broadcast on DVB-T. The motion picture film has several scene changes SZW, which are represented in FIG. 1 by vertical bold lines.

Furthermore, FIG. 1 shows the first data flow D1, which in this exemplary embodiment corresponds to a spoken advertising block of 15 seconds in length. This spoken advertising block is to be output at a synchronization time SZP together with the first data stream at a recipient. give, for example, on a TV. FIG. 1 also shows a time axis t, which represents a time sequence of the first and second data streams D1, D2.

In nine steps, which are marked in Figure 2 with circular symbols (1) to (9), the inventive method is exemplified, in which the first and second data stream is output at the synchronization time at a receiver synchronized in time.

A transmitter SM, the receiver EM and a time measurement generator ZM, the second data stream D2, that is the movie, in each case in a first step (1) passed. In this embodiment, the transmitter is a DVB-T transmitter, the receiver is a DVB-T set-top box, and the time-domain generator is a network component connected to a LAN (Local Area Network). Also, the transmitter and the receiver are connected to the LAN for exchanging information with the timing generator.

The transmitter SM has a transmitter-side counter TCS with a transmitter-side counter ZS, the receiver EM a receiving side counter TCE with a receiving counter counter ZE and the time dimension generator ZM a generator-side counter TCZ with a generator-side counter ZZ on, in which the respective counter reading ZS, ZE, ZZ is increased by one time unit each time an identical time unit expires, for example every millisecond.

A respective evaluation means DM of the transmitter, the receiver and the time-measurement generator analyzes in a second step (2) the movie with respect to one or more possible synchronization reference points SRP. This analysis is carried out by means of a predefinable property E. This predefinable property depends on the particular type of the second data stream. In this example, as specifiable property detects a respective scene change SZW. A person skilled in the field of video coding methods for detecting a scene change are known, so that will not be discussed further. At the output of the evaluation means DM, the synchronization reference point SRP is output, at which a synchronization of the counters can take place.

In a third step (3), the generator-side meter reading ZZ is determined by the timing generator TCM to the synchronization reference point SRP and transmitted to respective time synchronization means TSM of the transmitter and the receiver. The counter reading ZZ is ZZ = 00127600. The transmission takes place, for example, via LAN. After receiving the generator-side counter reading ZZ, the transmitter and the receiver set their respective counter readings ZS, ZE to the received generator-side counter reading ZZ, i. ZS = ZZ, ZE = ZZ. Thus, the counters TCS, TCM and TCZ run synchronously.

Furthermore, in a fourth step (4), the first data stream, ie the spoken advertising block, is supplied to an event means EVM, which determines the synchronization time SZP of the desired playback of the first data stream at the receiver. In a fifth step (5), the event agent EVM instructs a time stamping means TEM to determine a reference count RZ for the desired synchronization time SZP at which the synchronization of the first and second data stream is to take place. For this purpose, in a sixth step (6), the time-stamping means reads, for example, the transmission-side counter reading ZS and assigns it to the reference counter RZ, for example ZS = RZ = 00127665. In a variant, the time-stamping means determines the time in the future, to the synchronization to be made, eg in TRZ = 60 time units. For this purpose, first the counter ZS on the send side is determined, eg ZS = 00127600, and the reference count is calculated by RZ = ZS + TRZ = 00127660. In a seventh step (7), the transmitter transmits the reference count RZ to the receiver. The receiver compares by means of a comparison means VM the received reference count RZ with the current receive-side counter reading ZE. If there is a match and / or if the count on the receiving side is greater than the reference count, ie ZE> = RZ, then the synchronization time is reached.

In an eighth step (8), in the present example, the spoken advertising block at the synchronization time SZP is output together with the movie, so that the spoken commercial block is "superimposed" on the consumer during the movie.

In the following, alternatives for the property E are presented:

(a) PTS (Presentation Time Stamp) information of MPEG-2 (MPEG - Motion Picture Expert Group) standard can be used as the characterizing property E. The PTS information is used, for example, to synchronize a representation of MPEG-2 video and audio information. The PTS information is a 33-bit counter with a resolution of 90 kHz, which is attached to a transport stream comprising the video and audio information at least every 700 milliseconds. However, the PTS information need not be time linear, i. there may be time leaps. In addition, no content-related marking can take place with the PTS information.

The PTS information can be used in order to synchronize the transmit and receive counters with the generator-specific counter reading at certain times, for example every 2 minutes. The PTS information represents property E. (b) Further, as a characterizing property E, a physical property of a content of the second data stream D2 may be used, depending on the specific type of the second data stream. Thus, a scene change and / or a brightness distribution in image sequences or a sequence of loud and soft sounds in a piece of music can describe the characterizing property E. In general, in the context of this invention physical property is understood to be any physical quantity with which at least a portion of the content of the second data stream and / or the data stream itself can be characterized, such as, for example, color and / or brightness values for images, contrast. fang, change of light and dark areas and / or coding parameters that have been used to encode the second data stream. In the case of speech and / or music contents, a frequency range and / or a loudness can be taken into consideration as property E. The property E is dependent on the type of the second data stream, wherein the second data stream may include, in addition to picture and sound content, also text descriptions, scene descriptions or any other type of multimedia information individually or mixed.

(c) Furthermore, a content-based analysis of the second data stream can be performed. In this case, predefinable features are identified which correspond to the characterizing property E. For example, in a section of the movie, a number of people are examined. If the number of persons exceeds a number of, for example, three, the beginning of this section represents the synchronization reference point SRP. A person skilled in the art of pattern and object recognition is familiar with further methods which are used for the content-related analysis of inhalation th, such as audio or video content, can be used to determine one or more characterizing properties E, so that will not be discussed further. In general, content-based analysis describes one or more semantic properties.

In the following, the synchronization, i. Set, the sen- side-sided count by means of the generator-side count in a variant explained in which a correction of propagation delays, for example, by transmitting the generator-side counter ZZ that represents the time of detecting the synchronization reference point SRP until the Assigning the generator-side counter reading to the transmitting-side counter ZS arise. The procedure is analogously applicable to the recipient.

The evaluation means DM of the transmitter supplies the synchronization reference point SRP determined on the basis of the characterizing property E to a memory means ST which temporarily stores the transmission-side counter reading ZS valid at the time of occurrence of the synchronization reference point SRP. For example, the storage means ST contains a first transmission-side counter reading ZS (I) = 00127612.

The synchronization means TSM receives the counter on the generator side, for example ZZ = 00127600. Thus, at the time of occurrence of the synchronization reference point, the send-side, i. the first transmitter side, and the generator side

Counter reading by a time difference TC = ZS (I) -ZZ = 12 time units different. Since the time difference TC = 12 is positive, the transmitter-side counter advances by 12 time units. With a negative value for TC, the transmitter-side counter would track for TC time units. In the following, the transmission-side counter reading ZS is to be corrected in such a way that, at the time of detection, ie occurrence, of the synchronization message. point SRP the transmitting-side counter reading equals the transmitted generator-side counter reading ZZ.

For this purpose, the current transmission-side counter reading ZS is read out, for example, ZS = 00127650. In the following, the current counter reading of the transmit-side counter TCS is corrected by TC time units to a new transmit-end counter reading ZSN = ZS -TC = 00127638, so that after the correction the transmit-side counter reading ZS and the generator-side counter reading ZZ are time-synchronized.

If a transmission of the count ZZ is slow, it may happen that a new synchronization reference point is determined before the previous synchronization reference point was used for correcting the transmission-side counter reading. This can be avoided by the following additional extension of the method. The time measurement generator ZM transmits, in addition to the generator-side counter reading ZZ, an associated identification marker IK for characterizing the synchronization reference point SRP belonging to the generator-side counter reading ZZ. For example, the identification marker IK represents a number of scene changes since the beginning of the second data stream. In the present embodiment according to FIG. 1, the synchronization reference point SRP stands for the second scene change of the second

Data stream, i. IK = 2. The identification marker IK makes it possible to specify the synchronization reference point SRP for which synchronization of the transmission-side and reception-side counters is to be performed. This is particularly advantageous if the property E characterizing the second data stream is repeatedly detected at short intervals.

After receiving the generator-side counter reading ZZ, the transmitter and the receiver set their respective counter readings ZS, ZE to the received generator-side counter reading ZZ, ie ZS = ZZ, ZE = ZZ. Thus, the counters TCS, TCM and TCZ are running synchronous. In this case, the transmitted identification marker IK is taken into account, wherein the setting of the counter readings takes place at the time of detection of that synchronization reference point SRP which coincides with the position marked by the identification marker IK in the second data stream.

For example, the following information is stored in the memory module ST, wherein transmission-side identification markers ICS are written into the memory means SM by the evaluation means together with the associated first transmission-side counter reading ZS (I):

IKS ZS (I) 1 1527

2 1599

3 1601

4 1955

The synchronization means TCM of the transmitter receives the following information from the time measurement generator:

IK = 2; ZZ = 1655

In this case, the identification-tag-identical transmission-side identification marker ICS = IK = 2 is determined in the memory ST and the transmission-side identification marker associated first transmission-side counter reading ZS (I) = 1599 for synchronizing, i. Set, the transmission-side counter reading using the generator-side count used.

These embodiments can be transferred analogously to the receiver, the receiver having a further memory means ST, which instead of the transmitting-side first counter reading ZS (I) at least one receiver-side first counter reading ZE (I) and instead of the transmitting-side identification marker IKS comprises at least one receiving-side identification marker IKE.

The transmitter, receiver and / or timing generator may be in software, hardware or a combination of software and software

Hardware implemented and executed, the software is running on a processor with memory. In addition to a connection of the transmitter, the receiver and the time dimension generator via LAN, these can each be connected in pairs via other transmission media and transmission protocols, such as e.g. over fiber, wirelessly via GSM (Global System for Mobile Communications) or via IDSN (Integrated Services Digital Network).

Claims

claims

1. A method for temporally synchronizing a first and a second data stream (Dl, D2) at a synchronization time (SZP), a transmitter (SM) with a transmitting-side count (ZS), a receiver (EM) with an emp - Counter reading (ZE) and a Zeitmaß generator (ZM) with a generator-side counter reading (ZZ) includes, wherein the respective counts (ZS, ZE, ZZ) are increased by a counting unit at the expiration of a time interval, characterized in that following steps are performed:

- Detecting a synchronization reference point (SRP) in the second data stream (D2) respectively by the transmitter (SM), the receiver (EM) and the time dimension generator (ZM) on

Basis of a characteristic of the second data stream (D2) property (E);

- Transmitting the Synchronisationsreferenzpunkt (SRP) associated generator-side counter reading (ZZ) to the transmitter (SM) and the receiver (EM);

- Assigning the transmitted generator-side counter reading (ZZ) respectively to the transmitting-side counter reading (ZS) and the receiving-side counter reading (ZE) at the time of detecting the synchronization reference point (SRP); - Determining a reference count (RZ) of the transmitting-side counter reading (ZS) at which the second data stream (D2) will reach the synchronization time (SZP);

- Transmission of the reference count (RZ) from the transmitter

(SM) to the receiver (EM); - Evaluating the received reference count (RZ) by the receiver (EM) such that the first data stream (Dl) is synchronized with the second data stream (D2) at the time at which the receiving-side counter reading (ZE) at least the reference counter reading (RZ) reached.

2. The method according to claim 1, characterized in that the synchronization reference point (SRP) is described by the generator-side counter reading (ZZ) and an identification marker (IK), and the generator-side counter reading and the identification marker are transmitted to the transmitter (SM) and / or the receiver (EM), with reference to FIG Identification (IK) of the correct synchronization reference point (SRP) can be determined from a plurality of possible synchronization reference points.

3. The method according to any one of the preceding claims, characterized in that as a property (E) uses a PTS information, a physical property of a content of the second data stream, a coding of the second data stream and / or a semantic Describe a content of the second data stream becomes.

4. The method according to any one of the preceding claims, characterized in that the assignment of the transmitted generator-side counter reading (ZZ) to the transmitting-side counter reading (ZS) by addition of a time difference (TC) to the transmitting-side counter reading (ZS) is performed, wherein a time difference (TC ) is determined by subtracting the transmitted generator-side counter reading (ZZ) from the transmitting-side counter reading (ZS) relevant at the time of detection of the synchronization reference point (SRP).

5. The method according to any one of the preceding claims, characterized in that the assignment of the transmitted generator-side counter reading (ZZ) to the receiving-side counter reading (ZE) by adding a time difference (TC) to the receiving-side counter reading (ZE) is performed, wherein a time difference (TC ) by subtracting the transmitted generator-side counter reading (ZZ) from that at the time of detection of the sync. chronisationsreferenzpunkts (SRP) relevant receive-side counter reading (ZE) is determined.

6. Time measurement generator (ZM) for temporally synchronizing a first and a second data stream (Dl, D2) to one

Synchronization time (SZP) at a transmitter (SM) and a receiver (EM), in particular for carrying out the method according to one of claims 1 to 5, characterized in that the time measurement generator (ZM) has the following means:

- Detection means (DM) for detecting a synchronization reference point (SRP) in a second data stream (D2) based on a second data stream (D2) characterizing property (E); a generator-side counter (TCZ) for managing a generator-side counter reading (ZZ);

- Time generating means (TCM) for generating the at the time of detecting the synchronization reference point

(SRP) current generator-side counter reading (ZZ) and for transmitting this counter reading (ZZ) to the transmitter (SM) and / or receiver (EM).

7. time measurement generator (ZM) according to claim 6, characterized in that the time generating means (TCM) for determining and transmitting to the detected synchronization reference point (SRP) determined generator side counter reading (ZZ) and an associated identification marker (IK) to the transmitter (SM) and / or receiver (EM) is configured, wherein based on the identification marker (IK) of the correct synchronization reference point (SRP) can be determined from a plurality of possible synchronization reference points.

8. transmitter (SM) for synchronizing a first and a second data stream (Dl, D2) at a synchronization time (SZP) at a transmitter (SM) and a receiver (EM), in particular for carrying out the method according to one of claims 1 to 5, characterized in that the transmitter (SM) has the following means: - a detection means (DM) for detecting a synchronization reference point (SRP) in the second data stream (D2) based on a characteristic (E) characterizing the second data stream (D2);

a transmitting-side counter (TCS) for managing a transmitting-side counter reading (ZS);

a time synchronization means (TSM) for receiving a generator-side counter reading (ZZ) current at the time of detection of the synchronization reference point (SRP) and for associating the received generator-side counter reading (ZZ) with the transmit-side counter reading ZS at the time of detecting the synchronization reference point SRP ;

a time stamping means (TEM) for determining a reference count (RZ) of the transmitting-side counter reading (ZS) at which the second data stream (D2) will reach the synchronization instant (SZP) and for transmitting the reference counter reading (RZ) to the receiver (EM) ,

9. Transmitter (SM) according to claim 8, characterized in that the transmitter (SM) has the following means:

- the detection means (DM) for generating in each case a transmitter-side identification marker (ICS) and an associated first transmitter-side counter reading (ZS (I)), which characterize the detected synchronization reference point (SRP);

- The time synchronization means (TSM) for receiving the at the detected synchronization time (SZP) determined generator side counter reading (ZZ) and associated Identification markers (IK), for comparing the identification marker (IK) and the transmitting side identification mark (ICS) and assigning the generator-side counter reading (ZZ) to the transmitting-side counter reading (ZS), taking into account the first transmitting-side counter reading (ZS (I)), if the identification marker (IK) and the transmitting-side identification marker (ICS) have identical content.

10. A receiver (EM) for temporally synchronizing a first data stream (Dl) and a second data stream (D2) at a synchronization time (SZP), in particular for carrying out the method according to one of claims 1 to 5, characterized in that the receiver (EM) has the following resources:

- Detection means (DM) for detecting a synchronization reference point (SRP) in the second data stream (D2) based on a second data stream (D2) characterizing property (E);

a receive-side counter (TCE) for managing a receive-side counter reading (ZE);

a time synchronization means (TSM) for receiving a generator-side counter reading (ZZ) current at the time of detection of the synchronization reference point (SRP) and for assigning the received generator-side counter reading (ZZ) to the transmit-side counter reading ZS at the time of detecting the synchronization reference point ( SRP);

- A comparison means (VM) for receiving a reference count (RZ) from the transmitter (SM), wherein the reference count (RZ) indicating that transmitting-side count (ZS) at which the second data stream (D2) reaches the synchronization SZP (SZP) is, and to evaluate the

Reference count (RZ), wherein the first data stream (Dl) is synchronized with the second data stream (D2) at the time at which the receiving-side counter reading (ZE) reaches at least the reference count (RZ).

11. Receiver (EM) according to claim 10, characterized in that the consignee (EM) has:

- The detection means (DM) for creating a respective receive-side identification marker (IKE) and an associated receiving-side first counter reading (ZE (I)) characterizing the detected synchronization reference point (SRP);

- The time synchronization means (TSM) for receiving the to the detected synchronization reference point (SZP) determined generator-side counter reading (ZZ) and I-identification markers identified (IK), for comparing the Identifika- tion marker (IK) and the receiving-side identification mark (IKE) and assigning the Generator-side counter reading (ZZ) to the receiving-side counter reading (ZE), taking into account the first receiving-side counter reading (ZE (I)), if the identification marker (IK) and the receiving side identification marker (ICS) have an identical content.