CN113259083B - Phase synchronization method of frequency modulation synchronous network - Google Patents
Phase synchronization method of frequency modulation synchronous network Download PDFInfo
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- CN113259083B CN113259083B CN202110787269.9A CN202110787269A CN113259083B CN 113259083 B CN113259083 B CN 113259083B CN 202110787269 A CN202110787269 A CN 202110787269A CN 113259083 B CN113259083 B CN 113259083B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
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- H—ELECTRICITY
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- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
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Abstract
The invention relates to the field of wireless communication, in particular to a phase synchronization method of a frequency modulation synchronous network, which comprises the following steps: processing the audio signals of the first left and right sound channels through an audio coding module to obtain first correction phase data; the second audio decoder analyzes the first correction phase data to obtain second correction phase data; and judging the second calibration phase data at the fixed node through a second frequency modulation synchronous exciter, and selecting a corresponding phase value according to a judgment result. The first phase is sent by the encoder at regular time to correct the phase output by the second modulation synchronous frequency exciter, so that the phases of different second modulation synchronous frequency exciters can be kept consistent, and the signal-to-noise ratio is obviously improved in the cross coverage area of the frequency modulation synchronous network.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a phase synchronization method of a frequency modulation synchronous network.
Background
In a traditional frequency modulation FM network, the problem of network coverage is solved by increasing the power of a transmitter, and with the technical progress, the network coverage is solved by transmitting data in a mode of transmitting the same frequency, the same modulation degree and the same phase through a plurality of transmitters by means of a GPS clock through the technology of a frequency modulation synchronous network at present. The same frequency can be completely solved by using a GPS clock, the same modulation degree is realized in a digital mode in an FPGA, different modulators need to ensure the same phase, the phase change is obtained through amplitude accumulation in digital frequency modulation, the values of accumulators of two exciters are different at different starting moments, and even if the starting moments are completely the same and the received amplitude is wrong, the phases are also different. In the existing system, the phase consistency of the 19K pilot, 38K carrier and 57K sub-carrier is only ensured. The synthesized signal cannot be guaranteed to be consistent in phase.
Disclosure of Invention
The invention provides a phase synchronization method of a frequency modulation synchronous network, aiming at solving the problem of inconsistent phases of different modulators.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for frequency modulated synchronous network phase synchronization, the method comprising:
s1: the audio coding module processes audio signals of a first left channel and a first right channel to obtain first correction phase data;
s2: the second audio decoder analyzes the first correction phase data to obtain second correction phase data;
s3: and the second frequency modulation synchronous exciter judges the second calibration phase data at the fixed node, and selects a corresponding phase value according to the judgment result.
Further, the audio encoding module in S1 includes a first audio encoder, a first audio decoder, a phase calculation module in the first fm synchronous exciter, and an encoded audio and timing phase multiplexing unit.
Further, the S1 specifically includes:
s11: a first audio encoder encodes the audio signals of the first left and right channels to obtain encoded audio signals;
s12: the first audio decoder decodes the coded audio signals to obtain audio signals of a second left channel and a second right channel;
s13: a phase calculation module in the first frequency modulation synchronous exciter obtains a first correction phase;
s14: the first corrected phase and the encoded audio signal are multiplexed in an encoded audio and timing phase multiplexing unit to obtain first corrected phase data.
Furthermore, the models of the first audio decoder and the second audio decoder are the same, and the phase calculation module in the first fm synchronous exciter and the phase calculation module in the second fm synchronous exciter perform the same calculation.
Further, in S13:
the first frequency modulation synchronous exciter sends the first correction phase in the following mode: the first corrected phase data is transmitted to the encoded audio and timing phase multiplexing unit in a timed manner, or the first corrected phase is transmitted in fixed bytes in a control packet in a fm synchronous network in a manner of transmitting a synchronization signal flag.
Further, the S2 specifically includes:
and the second audio decoder decodes the first correction phase data to obtain audio signals of a third left channel and a third right channel, and analyzes control information of the frequency modulation synchronous network, wherein the audio signals of the third left channel and the third right channel and the first correction phase form second correction phase data.
Further, the S3 specifically includes:
the second frequency modulation synchronous exciter obtains a second correction phase by calculating the audio signals of a third left channel and a third right channel, and the first correction phase and the second correction phase at the moment are compared at the fixed node;
if the second frequency modulation phase is not consistent with the first frequency modulation phase, replacing the local phase with the first frequency modulation phase;
and if the second frequency modulation phase is consistent with the first frequency modulation phase, the local phase is reserved.
Further, the fixed node is a specified time or a synchronization signal flag.
The invention provides a phase synchronization method of a frequency modulation synchronous network, which has the following beneficial technical effects:
processing the audio signals of the first left and right sound channels through an audio coding module to obtain first correction phase data; the second audio decoder analyzes the first correction phase data to obtain second correction phase data; and judging the second calibration phase data at the fixed node through a second frequency modulation synchronous exciter, and selecting a corresponding phase value according to a judgment result. The first phase is sent by the encoder at regular time to correct the phase output by the second modulation synchronous frequency exciter, so that the phases of the second modulation synchronous frequency exciters of different transmitting sites can be kept consistent, and the signal-to-noise ratio is obviously improved in the cross coverage area of the frequency modulation synchronous network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart of a method for phase synchronization of a FM synchronous network;
fig. 2 is a schematic structural diagram of an implementation of a phase synchronization method of a frequency modulation synchronization network.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the prior art, in order to solve the problem of network coverage, different fm synchronous exciters need to be kept in the same phase, and to achieve the purpose, the invention creatively provides a phase synchronization method for a fm synchronous network, and the specific technical scheme is as follows:
as shown in fig. 1 and fig. 2, a phase calculation and encoded audio and timing phase multiplexing unit of a first audio encoder, a first audio decoder and a first fm synchronous exciter is arranged in an audio encoding module;
in the process of sending the audio signals, firstly, a first audio encoder is used for encoding the audio signals of a first left channel and a first right channel to obtain encoded audio signals, the encoded audio signals are transmitted to an encoded audio and timing phase multiplexing unit, a first audio decoder is used for decoding the encoded audio data to obtain audio signals of a second left channel and a second right channel and control information of a frequency modulation control network, the audio signals are subjected to phase calculation through a first frequency modulation module to obtain a first frequency modulation phase, and then first correction phase data is obtained, as the sending period of the first frequency modulation phase can be in a second unit and only one phase data (16 bit) is sent at a time, the first frequency modulation phase can be multiplexed and transmitted with the audio signals of the encoded left channel and the encoded right channel in the encoded audio and timing phase multiplexing unit in a time mode, furthermore, the first fm phase may also be placed in a fixed byte in a control packet in the fm synchronous network for transmission according to a manner of transmitting a synchronization signal flag.
And obtaining first correction phase data through an audio coding module, and then decoding the first correction phase data through a second decoder to obtain audio signals of a third left channel and a third right channel and a first frequency modulation phase. The audio signals of the third left and right channels and the timing phase together constitute second correction phase data.
Calculating the audio signals of the third left and right sound channels through a second frequency modulation synchronous exciter to obtain a second frequency modulation phase, comparing the first correction phase with the second correction phase at a fixed node, and replacing the local phase with the first frequency modulation phase if the second frequency modulation phase is not consistent with the first frequency modulation phase; and if the second frequency modulation phase is consistent with the first frequency modulation phase, the local phase is reserved.
The audio data received by different second frequency modulation exciters are consistent, and the local phase value is corrected in a timing mode, so that the problem of phase among different second exciters can be solved.
It should be noted that the fixed node is a predetermined time or synchronization signal flag; the first audio decoder and the second audio decoder have the same function, that is, the models of the first audio decoder and the second audio decoder are both NDS3605, and the first fm synchronous exciter and the second fm synchronous exciter have the same function, that is, the models of the first fm synchronous exciter and the second fm synchronous exciter are both DFM-5.
It should be noted that, in the implementation process, the first audio decoder may also implement the same decoding manner as the second audio decoder through software, without separately adding hardware devices; the first frequency modulation synchronous exciter can also realize the same mode as the second frequency modulation synchronous exciter through software in the realization process without independently increasing hardware equipment.
The audio encoder is used for realizing audio encoding, the audio encoding can reduce the bandwidth of audio transmission, and a synchronous control signal is added to ensure that the output time of the frequency modulation synchronous exciter is consistent; the model of the audio encoder is NDS 3261.
The audio decoder decodes audio signals of left and right channels from encoded audio. And simultaneously, the control information of the frequency modulation synchronous network is analyzed.
The frequency modulation synchronous exciter is used for realizing frequency modulation processing of the audio signal and controlling the output time of the frequency modulation signal according to the control information of the frequency modulation synchronous network.
The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
Claims (4)
1. A method for phase synchronization in a fm synchronous network, the method comprising:
s1: the audio coding module processes audio signals of a first left channel and a first right channel to obtain first correction phase data; the audio coding module comprises a first audio coder, a first audio decoder, a first frequency modulation synchronous exciter and a coding audio and timing phase multiplexing unit;
the method specifically comprises the following steps: a first audio encoder encodes the audio signals of the first left and right channels to obtain encoded audio signals; the first audio decoder decodes the coded audio signals to obtain audio signals of a second left channel and a second right channel; the first frequency modulation synchronous exciter calculates the audio signals of the second left and right sound channels to obtain a first correction phase; multiplexing the first correction phase and the coded audio signal in a coded audio and timing phase multiplexing unit to obtain first correction phase data;
s2: the second audio decoder obtains second correction phase data by analyzing the first correction phase data;
the method specifically comprises the following steps: a second audio decoder decodes the first correction phase data to obtain audio signals of a third left channel and a third right channel, and analyzes control information of a frequency modulation synchronous network, wherein the audio signals of the third left channel and the third right channel and the first correction phase form second correction phase data;
s3: the second frequency modulation synchronous exciter judges the second calibration phase data at a fixed node, and selects a corresponding phase value according to a judgment result;
the method specifically comprises the following steps: the second frequency modulation synchronous exciter obtains a second correction phase by calculating audio signals of a third left channel and a third right channel, and the first correction phase and the second correction phase are compared at the fixed node;
if the second corrected phase is inconsistent with the first corrected phase, replacing the local phase with the first corrected phase;
if the second corrected phase is identical to the first corrected phase, the local phase is preserved.
2. A fm synchronous network phase synchronization method as claimed in claim 1, wherein said first audio decoder is of the same type as said second audio decoder, and said first fm synchronous exciter is of the same type as said second fm synchronous exciter.
3. A fm synchronous network phase synchronization method as claimed in claim 1, wherein said first fm synchronous exciter transmits said first corrected phase by:
the first corrected phase data is transmitted to the encoded audio and timing phase multiplexing unit in a timed manner, or the first corrected phase is transmitted in fixed bytes in a control packet in a fm synchronous network in a manner of transmitting a synchronization signal flag.
4. A frequency modulated synchronous network phase synchronization method as claimed in claim 1, characterized in that said fixed node is a defined time or synchronization signal mark.
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