CN114124631B - Processing method suitable for audio synchronous control between embedded equipment of aircraft cabin - Google Patents
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- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 title abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 69
- 238000012545 processing Methods 0.000 claims abstract description 50
- 230000000903 blocking effect Effects 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 38
- 238000009825 accumulation Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 12
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
- H04H20/62—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast for transportation systems, e.g. in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The invention discloses a processing method suitable for audio synchronous control between embedded equipment of an onboard cabin, which comprises the following steps: according to the comparison value set in the receiving processing process of the audio data and the transmitting processing process of the audio data, the processing process of the audio data blocking caused by inconsistent transmitting and receiving frequencies is increased in the transmitting processing process of the audio data. The invention solves the problem of audio frequency asynchronous caused by frequency offset, and can achieve the maximum fidelity of audio data.
Description
Technical Field
The invention relates to the technical field of audio control of an onboard cabin, in particular to a processing method suitable for audio synchronous control among embedded equipment of the onboard cabin.
Background
The passenger cabin broadcasting and internal voice system of the aircraft generally comprises an audio acquisition device, an audio transmission transit device, an audio control playing device, a microphone, a loudspeaker and other components, and provides voice input and output interfaces for a driver and a crew member, so that passenger broadcasting service of the driver and the crew member is realized, and passenger cabin point-to-point and group internal voice service among the driver and the crew member and among a plurality of crew members is realized. The audio collection device is used for sampling and packing voice data, and the audio transmission transfer device is used for distributing the audio data to the audio control playing device for playing voice according to the communication requirements of broadcasting and internal voice functions. The audio data is transmitted through the network in the whole system, in order to reduce buffering delay, 384 bytes of audio sampling data are transmitted at intervals of 4ms as an audio packet, and the transmission frequency and interface protocol accord with the on-board audio transmission communication standard ARINC628P3 protocol.
In order to meet the requirements of real-time performance, synchronism and high stability, an embedded operating system is generally adopted for development of audio acquisition equipment, audio transmission transfer equipment, audio control playing equipment and the like in a passenger cabin broadcasting and intercom system. Due to the difference of functions of a hardware circuit, signal processing software and the like among multiple devices, even if the same type of crystal is used as a frequency source, the clock frequency offset among the devices still exists to cause the increase of accumulated errors in the audio data transmission process, and the situation that the whole broadcasting and the internal call service are influenced occurs due to the sound lag.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a processing method suitable for audio synchronization control among the embedded equipment of the passenger cabin of the aircraft, solves the problem of audio non-synchronization caused by frequency offset, and can achieve the maximum fidelity of audio data.
The invention aims at realizing the following scheme:
a processing method suitable for audio synchronization control between embedded equipment of an on-board passenger cabin comprises the following steps: according to the comparison value set in the receiving processing process of the audio data and the transmitting processing process of the audio data, the processing process of the audio data blocking caused by inconsistent transmitting and receiving frequencies is increased in the transmitting processing process of the audio data.
Further, the set comparison value includes a difference value of the audio reception data statistic and the audio data transmission statistic.
Further, the processing procedure of the audio data blocking comprises the following substeps: and calculating a difference value diffaudiod of the audio receiving data statistic value RevAudio and the audio data sending statistic value SendAudio by taking the set time as a period, if the diffaudiod of the current set time is the same as the diffaudiod of the previous set time, the audio transmission transfer equipment and the audio acquisition equipment have no frequency offset, and if the diffaudiod of the current set time is different from the diffaudiod of the previous set time, the frequency offset exists, and the audio transmission dyssynchrony caused by the frequency offset is eliminated.
Further, the method comprises a receiving process of the audio control data; the receiving processing process of the audio control data comprises the following substeps: s11, receiving a network audio control message through a predefined network port; s12, identifying the source of the audio control message according to the receiving port and the IP address of the sending source, wherein the source comprises a cockpit microphone, a cabin microphone and background music, prerecorded audio and video which are stored in advance in an entertainment system; s13, carrying out data analysis on the received audio control message; s14, identifying audio control information, judging whether the control information is to start audio playing or stop audio playing, and if the control information is to start audio playing, performing step S15; if the audio playing is stopped, performing step S16; s15, judging whether the priority of the equipment for starting the audio playing source is higher than the priority of the current audio playing source according to the broadcasting of the passenger cabin and the broadcasting and the priority of the internal telephone system, if so, setting the audio playing state as playing, otherwise, setting the audio playing state as stopping playing; s16, finishing data processing, and continuing to wait for the next frame of network audio control message.
Further, the receiving processing process of the audio data comprises the following sub-steps: s21, receiving a network audio data message through a predefined network port; s22, identifying the source of the audio data message according to the receiving port and the IP address of the sending source; s23, if the receiving source of the data message is consistent with the source equipment in the playing state in the step S15, performing the step S24, otherwise, performing the step S26; s24, storing the audio data into a receiving buffer area; s25, audio data receiving statistic RevAudio accumulation is 1; s26, finishing data processing, and continuing to wait for the next frame of network audio data message.
Further, the transmission processing process of the audio data comprises the following sub-steps: s31, when a clock interrupt of 4ms is received, the step S32 is carried out, otherwise, the waiting is continued; s32, whether the audio data in the receiving buffer area is more than or equal to 1, if yes, performing step S33, otherwise, performing step S31; s33, assembling the audio data in the receiving buffer area and the identification number of the target equipment identified in the step S13 into an audio data packet and sending the audio data packet through a network; s34, audio data sending statistic SendAudio accumulation 1 and beat statistic period accumulation 1; s35, the data transmission is ended, and the process proceeds to step S31.
Further, the processing procedure of the audio data blocking comprises the following substeps: s41, calculating a diffAudo difference value offsetValue between the diffAudo of the current 1S and the diffAudo of the previous 1S; s42, if offsetValue >0, go to step S43; if offsetValue <0, go to step S49; s43, the audio data packets are sent according to the period of 4ms under the normal condition, and the number of the audio data packets transmitted in 1S is 1000/4=250; the current offsetValue is more than 0, and the number of audio data packets to be transmitted in the next 1s is 250+offsetvalue, so that the audio data packets can be ensured not to be blocked in a receiving buffer area; calculating a mixValue value according to the formula mixvalue=250/offsetValue; s44, calculating the transmission time mixPiriod [ i ] of the needed mixing process according to the following processing procedure,
For(i＝1；i<＝offsetValue；i++)
{
mixPeriod[i]＝i*mixValue；
}；
s45, when the beat value period value in the step S33 is equal to the mixface [ i ], mixing the Audio data of the two adjacent current packets by adopting an average adjustment weight method, wherein the specific formula of the average adjustment weight method is mixAudio [ offset ] = (Audio 1[ offset ] +Audio2[ offset ])/2; s46, taking the mixAudio as new audio data, and assembling and transmitting the new audio data through the step S33; s47, audio data transmission statistic SendAudio accumulation 2 in the step S34; s48, continuing the processing of the step S45 until all the mixface [ i ] values are traversed; s49, the process is ended, and when 1S clock period expires, the process proceeds to step S41.
Further, in step S44, when offsetValue is 3, there are 3 transmission times when the mixing process is required, which are respectively mixPeriod [0] =83, mixPeriod [1] =166, and mixPeriod [2] =249.
The beneficial effects of the invention include:
the audio control synchronization method can solve the problem of audio non-synchronization caused by frequency offset by using the most simplified and effective algorithm and processing logic on the basis of not moving the original audio data processing frame, and controls the influence of the frequency offset to the current equipment without causing the influence of frequency offset superposition to the back-end equipment. Meanwhile, the audio mixing algorithm adopts a 2-channel average weight adjustment method, so that the audio data can be maximally fidelity under the condition that new noise is not introduced any more.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a block diagram of a cabin broadcast and intercom system;
FIG. 2 is a flow chart of receiving an audio control text according to an embodiment of the present invention;
FIG. 3 is a flow chart of audio data reception according to an embodiment of the present invention;
fig. 4 is a flowchart of audio data transmission according to an embodiment of the present invention.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
Example 1: aiming at the problems in the background art, on the basis that the existing audio communication interface meets ARINC628P3 protocol, the embodiment provides a processing method suitable for audio synchronization control among embedded equipment of an on-board passenger cabin, which is used for solving the problem that a plurality of equipment in a passenger cabin broadcasting and internal voice system are asynchronous in audio due to frequency offset, and specifically comprises the following steps: according to the comparison value set in the receiving processing process of the audio data and the transmitting processing process of the audio data, the processing process of the audio data blocking caused by inconsistent transmitting and receiving frequencies is increased in the transmitting processing process of the audio data.
As shown in fig. 1, the cabin broadcasting and intercom system is used for providing services such as passenger broadcasting, group meeting, emergency/normal calling, audio/video playing, etc. for drivers and cabin crews, and is generally composed of components such as an audio acquisition device, an audio transmission transfer device, an audio control playing device, a microphone, an earphone, a loudspeaker, etc., and the structural block diagram of the system is shown in fig. 1. The audio acquisition equipment is used for completing the acquisition of sounds such as a driver microphone, a cabin attendant microphone, background music, prerecorded audio, video and the like, and audio data is sampled according to 16 bits, wherein the sampling rate is 48KHZ. The audio transmission transfer equipment completes the transmission control functions of cabin broadcasting and audio of an intercom system, and is a core control hub of the whole system, and the functions realized comprise logic processing such as broadcasting/intercom priority control, audio data distribution transfer control, volume and indicator light control, system maintenance and the like. The audio control playing device completes the driving playing of the audio data and is an end control unit of the whole system for directly driving the sound playing of the loudspeaker and the earphone.
Example 2: on the basis of embodiment 1, in this embodiment, the method of the present invention is described by the most complex and core audio transmission transfer device, that is, the method includes an adaptive control implementation mechanism for implementing audio synchronization, and the audio control playing device can directly refer to the method. The audio transfer apparatus generally includes processes of reception processing of audio control data, reception processing of audio data, transmission processing of audio data, and the like. The steps of receiving and processing the audio control data are shown in fig. 2, and the specific implementation steps are as follows:
step 11, receiving a network audio control message through a predefined network port;
step 12, identifying the source of the audio control message according to the receiving port and the IP address of the sending source, wherein the source comprises a cockpit microphone, a cabin microphone, background music, prerecorded audio, video and the like which are stored in advance in an entertainment system;
step 13, data analysis is carried out on the received audio control message;
step 14, identifying audio control information, judging whether the control information is to start audio playing or stop audio playing, and if the control information is to start audio playing, performing step 15; if the audio playing is stopped, performing step 16;
step 15, judging whether the priority of the equipment for starting the audio playing source is higher than the priority of the current audio playing source according to the priority of the broadcasting and the internal telephone of the passenger cabin broadcasting and the internal telephone system, if so, setting the audio playing state as playing, otherwise, setting the audio playing state as stopping playing;
and step 16, finishing data processing, and continuing to wait for the next frame of network audio control message.
The audio data receiving processing steps are shown in fig. 3, and the specific implementation steps are as follows:
step 21, receiving a network audio data message through a predefined network port;
step 22, identifying the source of the audio data message according to the receiving port and the IP address of the sending source;
step 23, if the receiving source of the data message is consistent with the source device in the playing state in step 15, step 24 is performed, otherwise step 26 is performed;
step 24, storing the audio data in a receiving buffer;
step 25, audio data receiving statistic RevAudio accumulation 1;
and step 26, finishing data processing, and continuing to wait for the next frame of network audio data message.
The audio data transmission processing steps are shown in fig. 4, and the specific implementation steps are as follows:
step 31, if a clock interrupt of 4ms is received, step 32 is performed, otherwise, waiting is continued;
step 32, whether the audio data in the receiving buffer area is greater than or equal to 1, if yes, step 33 is performed, otherwise step 31 is performed;
step 33, the audio data in the receiving buffer area and the identification number of the target equipment identified in step 13 are assembled into an audio data packet to be sent through a network;
step 34, audio data transmission statistic SendAudio accumulation 1 and beat statistic period accumulation 1;
step 35, the data transmission is ended, and the process proceeds to step 31.
The audio synchronization control process needs to increase the processing process of audio data blocking caused by inconsistent receiving and transmitting frequencies in the processing process of audio data transmission, and the specific implementation scheme is that the audio receiving data statistic value RevAudio in the step 25 and the audio data transmitting statistic value SendAudio difference value DiffAudo in the step 34 are calculated by taking 1s as a period, if the DiffAudo value of the current 1s is the same as the DiffAudo value of the previous 1s, the audio transmission transfer equipment and the audio acquisition equipment have no frequency offset, if different, the frequency offset exists, and the audio transmission asynchronism caused by the frequency offset needs to be eliminated, and the specific implementation steps are as follows:
step 41, calculating the diffAudo difference value offsetValue between the diffAudo of the current 1s and the diffAudo of the previous 1 s;
step 42, if offsetValue >0, the clock frequency of the audio transmission transfer device is smaller than that of the audio collection device, and step 43 is performed; if offsetValue <0, it indicates that the running clock frequency of the audio transmission transfer device is greater than that of the audio acquisition device, in theory, the clock frequency is greater, and the data in the data receiving buffer area will not have transmission delay, so that the audio data is blocked, so step 49 is directly performed;
in step 43, the audio data packets are normally sent in a period of 4ms, and the number of audio data packets that can be transmitted in 1s is 1000/4=250. The current offsetValue >0, and the number of audio data packets to be transmitted in the next 1s is 250+offsetvalue, so that the audio data packets cannot be blocked in the receiving buffer. The mixValue value is calculated according to the formula mixvalue=250/offsetValue.
Step 44, calculating the transmission time mixPeriod [ i ] of the mixing process according to the following processing procedure, for example, when the offsetValue is 3, the transmission time of the mixing process is 3, which are respectively mixPeriod [0] =83, mixPeriod [1] =166, and mixPeriod [2] =249;
For(i＝1；i<＝offsetValue；i++)
{
mixPeriod[i]＝i*mixValue；
}
step 45, when the period value in step 33 is equal to the mixPeriod [ i ], mixing the Audio data of the two adjacent packets by adopting an average adjustment weight method, wherein the specific formula of the average adjustment weight method is mixAudio [ offset ] = (audio1 [ offset ] +audio2[ offset ])/2;
step 46, using the mixaudios as new audio data to be assembled and transmitted through step 33;
step 47, the audio data transmission statistic SendAudio accumulation 2 in step 34;
step 48, the process of step 45 continues until all the mixface [ i ] values have been traversed.
Step 49, the process is ended, and when 1s clock period expires, the process proceeds to step 41.
The audio control synchronization method realized by the scheme can solve the problem of audio non-synchronization caused by frequency offset by using the simplest and most effective method and processing logic on the basis of not moving the original audio data processing frame, controls the influence of the frequency offset on the current equipment, and cannot cause the influence of frequency offset superposition on the back-end equipment. Meanwhile, the audio mixing algorithm adopts a 2-channel average weight adjustment method, so that the audio data can be maximally fidelity under the condition that new noise is not introduced any more.
The invention is not related in part to the same as or can be practiced with the prior art.
The foregoing technical solution is only one embodiment of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the application methods and principles disclosed in the present invention, not limited to the methods described in the foregoing specific embodiments of the present invention, so that the foregoing description is only preferred and not in a limiting sense.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A processing method suitable for audio synchronization control between embedded equipment of an on-board passenger cabin is characterized by comprising the following steps: according to the comparison value set in the receiving processing process of the audio data and the transmitting processing process of the audio data, the processing process of audio data blocking caused by inconsistent receiving and transmitting frequencies is added in the transmitting processing process of the audio data; the processing procedure of the audio data blocking comprises the following substeps: calculating a difference value diffaudios of an audio receiving data statistic value RevAudio and an audio data sending statistic value SendAudio by taking a set time as a period, if the diffaudios of the current set time are the same as the diffaudios of the previous set time, the audio transmission transfer equipment and the audio acquisition equipment have no frequency offset, if the diffaudios of the current set time are different, the frequency offset exists, and the audio transmission dyssynchrony caused by the frequency offset is eliminated; the method also comprises a receiving and processing process of the audio control data;
the receiving processing process of the audio control data comprises the following substeps:
s11, receiving a network audio control message through a predefined network port;
s12, identifying the source of the audio control message according to the receiving port and the IP address of the sending source, wherein the source comprises a cockpit microphone, a cabin microphone and background music, prerecorded audio and video which are stored in advance in an entertainment system;
s13, carrying out data analysis on the received audio control message;
s14, identifying audio control information, judging whether the control information is to start audio playing or stop audio playing, and if the control information is to start audio playing, performing step S15; if the audio playing is stopped, performing step S16;
s15, judging whether the priority of the equipment for starting the audio playing source is higher than the priority of the current audio playing source according to the broadcasting of the passenger cabin and the broadcasting and the priority of the internal telephone system, if so, setting the audio playing state as playing, otherwise, setting the audio playing state as stopping playing;
s16, finishing data processing, and continuing to wait for a next frame of network audio control message;
the receiving processing process of the audio data comprises the following substeps:
s21, receiving a network audio data message through a predefined network port;
s22, identifying the source of the audio data message according to the receiving port and the IP address of the sending source;
s23, if the receiving source of the data message is consistent with the source equipment in the playing state in the step S15, performing the step S24, otherwise, performing the step S26;
s24, storing the audio data into a receiving buffer area;
s25, audio data receiving statistic RevAudio accumulation is 1;
s26, finishing data processing, and continuing to wait for the next frame of network audio data message;
the transmission processing process of the audio data comprises the following substeps:
s31, when a clock interrupt of 4ms is received, the step S32 is carried out, otherwise, the waiting is continued;
s32, whether the audio data in the receiving buffer area is more than or equal to 1, if yes, performing step S33, otherwise, performing step S31;
s33, assembling the audio data in the receiving buffer area and the identification number of the target equipment identified in the step S13 into an audio data packet and sending the audio data packet through a network;
s34, audio data sending statistic SendAudio accumulation 1 and beat statistic period accumulation 1;
s35, ending the data transmission, and continuing to step S31;
a process for the treatment of audio data congestion comprising the sub-steps of:
s41, calculating a diffAudo difference value offsetValue between the diffAudo of the current 1S and the diffAudo of the previous 1S;
s42, if offsetValue >0, go to step S43; if offsetValue <0, go to step S49;
s43, the audio data packets are sent according to the period of 4ms under the normal condition, and the number of the audio data packets transmitted in 1S is 1000/4=250; the current offsetValue is more than 0, and the number of audio data packets to be transmitted in the next 1s is 250+offsetvalue, so that the audio data packets can be ensured not to be blocked in a receiving buffer area; calculating a mixValue value according to the formula mixvalue=250/offsetValue;
s44, calculating the transmission time mixPiriod [ i ] of the needed mixing process according to the following processing procedure,
For（i=1;i<=offsetValue; i++）
{
mixPeriod[i] = i*mixValue;
}；
s45, when the beat value period value in the step S33 is equal to the mixface [ i ], mixing the Audio data of the two adjacent current packets by adopting an average adjustment weight method, wherein the specific formula of the average adjustment weight method is mixAudio [ offset ] = (Audio 1[ offset ] +Audio2[ offset ])/2;
s46, taking the mixAudio as new audio data, and assembling and transmitting the new audio data through the step S33;
s47, audio data transmission statistic SendAudio accumulation 2 in the step S34;
s48, continuing the processing of the step S45 until all the mixface [ i ] values are traversed;
s49, the process is ended, and when 1S clock period expires, the process proceeds to step S41.
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