CN112217602B - Method, device and terminal for processing cluster voice packet - Google Patents
Method, device and terminal for processing cluster voice packet Download PDFInfo
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- CN112217602B CN112217602B CN201910628151.4A CN201910628151A CN112217602B CN 112217602 B CN112217602 B CN 112217602B CN 201910628151 A CN201910628151 A CN 201910628151A CN 112217602 B CN112217602 B CN 112217602B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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Abstract
The invention provides a method, a device and a terminal for processing a cluster voice packet. The method comprises the steps of receiving a first transmission block sent by network equipment, wherein the first transmission block comprises a first voice packet with voice FEC (forward error correction) coding information; performing MAC layer CRC on the first transmission block; if the CRC result indicates that the voice FEC encoding information does not pass, performing error correction on the first voice packet in the first transmission block according to the voice FEC encoding information, and determining the first voice packet after error correction as a target voice packet; and playing the target voice packet. The method improves the playing quality of the cluster voice.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a method, an apparatus, and a terminal for processing a trunking voice packet.
Background
In a Long Term Evolution (LTE) network, data is usually transmitted in units of data blocks during data transmission. When a sending end sends a data block to a receiving end, a Media Access Control (MAC) layer of the receiving end determines whether the received data block is correct according to a Cyclic Redundancy Check (CRC) code corresponding to the data block, and if the received data block is incorrect, a Negative Acknowledgement (NACK) message is replied to the sending end to indicate the sending end to resend the data block, where the retransmission mechanism is a Hybrid Automatic Repeat reQuest (HARQ) in LTE.
However, in the trunking voice service, when the base station sends the data block including the trunking voice packet to the user equipment, the HARQ retransmission does not exist, and when the user equipment determines that the received data block is incorrect according to the CRC code corresponding to the data block, the user equipment may directly discard the data block, so that the block error rate of the trunking voice packet is too high, and the quality of voice playing is not high in the voice playing process.
Disclosure of Invention
The invention provides a method, a device and a terminal for processing a cluster voice packet, which are used for improving the playing quality of cluster voice.
The invention provides a processing method of a cluster voice packet, which comprises the following steps:
receiving a first transport block sent by network equipment; the first transmission block comprises a first voice packet with voice forward error correction coding information;
performing MAC layer cyclic redundancy check on the first transport block;
if the MAC layer cyclic redundancy check result indicates that the voice packet does not pass the MAC layer cyclic redundancy check result, performing error correction on the first voice packet in the first transmission block according to the voice forward error correction coding information, and determining the first voice packet after error correction as a target voice packet;
and playing the target voice packet.
Optionally, the method further includes:
if the MAC layer cyclic redundancy check result indicates passing, determining the first voice packet in the first transmission block as a target voice packet;
and playing the target voice packet.
Optionally, the playing the target voice packet includes:
decoding the target voice packet to obtain a decoded target voice signal;
determining a signal-to-noise ratio of a target speech signal;
if the signal-to-noise ratio of the target voice signal is greater than or equal to a first threshold value, playing the target voice signal;
and if the signal-to-noise ratio of the target voice signal is smaller than the first threshold value, stopping playing the target voice signal.
Optionally, the playing the target voice packet includes:
decoding the target voice packet to obtain a decoded target voice signal;
determining the average value of the signal-to-noise ratio of the target voice signal and the signal-to-noise ratio of the voice signal after the second voice packet in the second transmission block is decoded; the second transport block is a previous transport block of the first transport block;
and if the average value is larger than or equal to a second threshold value, playing the target voice signal.
If the average value is smaller than the second threshold value, the target voice signal is stopped to be played.
Optionally, the voice packet is a narrowband voice coding NVOC voice packet.
Optionally, the transport block includes at least one NVOC voice packet.
The invention provides a processing device of a cluster voice packet, comprising:
the receiving module is used for receiving a first transmission block sent by network equipment; the first transmission block comprises a first voice packet with voice forward error correction coding information;
a check module, configured to perform MAC layer cyclic redundancy check on the first transport block;
a determining module, configured to correct an error of the first voice packet in the first transport block according to the voice forward error correction coding information if the MAC layer cyclic redundancy check result indicates that the MAC layer cyclic redundancy check result does not pass, and determine the first voice packet after error correction as a target voice packet;
and the playing module is used for playing the target voice packet.
Optionally, the determining module is further configured to:
if the MAC layer cyclic redundancy check result indicates passing, determining the first voice packet in the first transmission block as a target voice packet;
correspondingly, the playing module is used for playing the target voice packet.
Optionally, the playing module is specifically configured to:
decoding the target voice packet to obtain a decoded target voice signal;
determining the signal-to-noise ratio of a target speech signal;
if the signal-to-noise ratio of the target voice signal is greater than or equal to a first threshold value, playing the target voice packet;
and if the signal-to-noise ratio of the target voice signal is smaller than the first threshold value, stopping playing the target voice packet.
Optionally, the playing module is specifically configured to:
decoding the target voice packet to obtain a decoded target voice signal;
determining the average value of the signal-to-noise ratio of the target voice signal and the signal-to-noise ratio of the voice signal after the second voice packet in the second transmission block is decoded; the second transport block is a previous transport block of the first transport block;
and if the average value is larger than or equal to a second threshold value, playing the target voice packet.
And if the average value is smaller than the second threshold value, stopping playing the target voice packet.
The invention provides a terminal, which comprises a memory and a processor; the memory is connected with the processor;
the memory for storing a computer program;
the processor is configured to implement the method for processing the clustered voice packets as in any one of the above when the computer program is executed.
The invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of processing a trunked voice packet as in any one of the above.
The invention provides a method, a device and a terminal for processing a cluster voice packet, wherein a first transmission block sent by network equipment is received, and the first transmission block comprises a first voice packet with voice FEC (forward error correction) coding information; performing MAC layer CRC on the first transmission block; if the CRC result indicates that the first voice packet does not pass the CRC check, correcting the error of the first voice packet in the first transmission block according to the voice FEC encoding information, and determining the corrected first voice packet as a target voice packet; and playing the target voice packet. According to the method, the FEC encoding is carried out on the first transmission block, when the terminal receives the first transmission block containing error data, the error correction can be carried out on the first voice packet in the first transmission block according to the FEC encoding information, the bit error rate of the first voice packet after error correction is low, and therefore the playing quality of the cluster voice is improved.
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 embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first flowchart illustrating a method for processing a cluster voice packet according to the present invention;
fig. 2 is a schematic flow chart of a method for processing a cluster voice packet according to the present invention;
fig. 3 is a third schematic flow chart of a method for processing a cluster voice packet according to the present invention;
fig. 4 is a schematic structural diagram of a device for processing a clustered voice packet according to the present invention;
fig. 5 is a schematic structural diagram of a terminal according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
The terms "first," "second," and "third," etc. in the various portions of the embodiments and figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein.
In the trunking voice service, when a base station sends a transmission block including trunking voice packets to user equipment, and the user equipment determines that the received transmission block is incorrect according to a CRC code corresponding to the transmission block, the user equipment may directly discard the transmission block, so that the block error rate of the trunking voice packets is too high, and when the block error rate exceeds a certain value, the playing quality of the trunking voice packets may be significantly reduced, and the service requirements cannot be met. The invention provides a processing method of a cluster voice packet, which is used for improving the playing quality of cluster voice.
Fig. 1 is a first flowchart illustrating a method for processing a cluster voice packet according to the present invention. The main execution body of the method is a processing device of the cluster voice, the device can be realized in a software and/or hardware mode, for example, the processing device of the cluster voice can be a terminal device. As shown in fig. 1, the method of this embodiment may include:
s101, receiving a first transmission block sent by network equipment.
Wherein the first transport block comprises a first voice packet with Forward Error Correction (FEC) coding information.
In this embodiment, the network device sends the trunking voice packet to the terminal in the form of a transmission block, where the network device may be a base station, and the terminal may be a device such as a mobile phone and a tablet computer. The first transmission block sent by the network device to the terminal includes a first voice packet, where the first voice packet is a trunking voice packet with voice FEC coding information, that is, the network device uses an Error Correction Code (ECC) to redundantly Code the first voice packet. The redundant part of the FEC coding allows the terminal to detect possible errors when receiving the first speech packet and to correct these errors without the need for retransmission.
S102, MAC layer CRC check is carried out on the first transmission block.
The first transport block includes, in addition to the above-mentioned speech FEC coding information, a CRC check code, for example, a 24-bit CRC check code at the end of the first transport block, which is calculated by the network device according to the first transport block. When the terminal MAC layer carries out CRC on the first transmission block, a CRC code is obtained through calculation according to the first transmission block, and whether the CRC code obtained through calculation of the terminal is the same as the CRC code carried by the tail end of the first transmission block or not is judged. If the two transmission blocks are the same, the CRC passes, which indicates that the data in the first transmission block received by the terminal is not changed in the transmission process, namely the first transmission block received by the terminal is correct. If the transmission data in the first transmission block received by the terminal is different from the transmission data in the second transmission block received by the terminal, the CRC does not pass, and the CRC indicates that the data in the first transmission block received by the terminal is changed in the transmission process, namely, the data in the first transmission block received by the terminal is partially or completely incorrect.
And S103, if the CRC result indicates that the first voice packet does not pass the CRC check, correcting the error of the first voice packet in the first transmission block according to the voice FEC coding information, and determining the corrected first voice packet as a target voice packet.
If the CRC check result does not pass in S102, it indicates that part or all of the data in the first transport block received by the terminal is incorrect, and at this time, the first voice packet needs to be corrected according to the voice FEC encoding information in the first transport block. Specifically, after the MAC layer CRC check is performed on the first transport block, if the check fails, the transport block is transmitted to the upper layer through a Media Access Control (MAC) layer Protocol Data Unit (PDU), and the subsequent Packet Data Convergence Protocol (PDCP) layer extracts the first voice Packet after removing the overhead of the first transport block. And then, the first voice packet can be subjected to error correction through the voice FEC encoding information, part or all of the error bits in the first voice packet can be recovered into correct data through the error correction, and the error-corrected first voice packet is a target voice packet to be played.
And S104, playing the target voice packet.
When the terminal plays the target voice packet, the target voice packet needs to be correspondingly decoded, and the target voice packet can be played according to a decoding result after decoding.
The method for processing a trunking voice packet provided in this embodiment includes receiving a first transport block sent by a network device, where the first transport block includes a first voice packet with voice FEC coding information; performing MAC layer CRC on the first transmission block; if the CRC result indicates that the first voice packet does not pass the CRC check, correcting the error of the first voice packet in the first transmission block according to the voice FEC encoding information, and determining the corrected first voice packet as a target voice packet; and playing the target voice packet. According to the method, the FEC encoding is carried out on the first transmission block, when the terminal receives the first transmission block containing error data, the error correction can be carried out on the first voice packet in the first transmission block according to the voice FEC encoding information, the bit error rate of the first voice packet after error correction is low, and therefore the playing quality of the cluster voice is improved.
If the CRC check result indicates that the CRC check result passes after the CRC check is performed on the first transmission block in step S102, determining the first voice packet in the first transmission block as a target voice packet; and playing the target voice packet. Specifically, after the MAC layer CRC of the first transport block is passed, the first transport block is directly transmitted to the higher layer via the MAC PDU for subsequent processing.
Optionally, the trunked Voice packet in the above embodiment may be a narrowband Band Voice Code (NVOC) Voice packet. When the cluster NVOC voice service is borne by the LTE, at least one NVOC voice packet is borne and sent on a data sharing channel of the LTE according to a certain period. That is, in the above embodiment, the first transport block includes at least one NVOC voice packet therein.
Specifically, the NVOC voice vocoder outputs 48 bits of cell codes every 20 ms, and when FEC coding is not used, i.e., no FEC protection is provided, one NVOC voice packet is 48 bits, and when FEC coding is used, i.e., FEC protection is provided, the NVOC voice packet can be formed by protecting through additional 24 bits of voice FEC coding information. Further, the certain period may be 20 ms, 40 ms, 60 ms, etc., and may respectively transmit 1, 2, or 3 NVOC voice packets.
When the NVOC voice packet is not FEC protected, the transport block size carried by the LTE one downlink data shared channel may be one of 88 bits, 104 bits, 144 bits, 152 bits, 176 bits, 208 bits, and 256 bits. When the NVOC voice packet is FEC-protected, the transport block size carried by the LTE one downlink data sharing channel may be one of 120 bits, 176 bits, 208 bits, 224 bits, 256 bits, and 328 bits.
When a terminal and a network device, such as a base station, negotiate to use NVOC cluster voice coding for a group call, the physical layer processing process of a downlink shared channel of the base station remains the same as the existing LTE mechanism, but no LTE HARQ retransmission exists. And the terminal checks the received CRC check code of each transmission block. If the CRC passes, transmitting the transmission block to a high layer through the MAC PDU; if the CRC check fails, the transport block is also transmitted to higher layers through the MAC PDU. And after the overhead is removed by the subsequent high layer, the NVOC voice packet is extracted. When NVOC FEC protection exists, NVOC voice can be corrected through the FEC and then sent to the NVOC vocoder for decoding, and then the decoded voice signal is played.
The process of playing the target voice packet by the terminal in S104 is further described with reference to two embodiments. Fig. 2 is a schematic flow chart of a method for processing a clustered voice packet according to the present invention. As shown in fig. 2, the method includes:
s201, decoding the target voice packet to obtain a decoded target voice signal.
S202, determining the signal-to-noise ratio of the target voice signal.
S203, judging whether the signal-to-noise ratio of the target voice signal is greater than or equal to a first threshold value, if so, executing S204; if not, go to S205.
And S204, playing the target voice signal.
S205, stopping playing the target voice signal.
The terminal obtains a decoded target voice signal from the target voice packet, for example, if the target voice packet is an NVOC voice packet, the NVOC vocoder decodes the NVOC voice packet to obtain a corresponding target voice signal. The signal-to-noise ratio of the target speech signal is the ratio of signal to noise in the target speech signal, and the higher the signal-to-noise ratio, the higher the quality of the target speech signal. Therefore, before the target voice signal is played, the signal-to-noise ratio of the target voice signal is determined, if the signal-to-noise ratio of the target voice signal is greater than or equal to a first threshold, wherein the first threshold can be set according to actual conditions, the target voice signal is played with good quality, and conversely, if the signal-to-noise ratio of the target voice signal is less than the first threshold, the target voice signal is played with poor quality, and the target voice signal is stopped.
In the processing method for the cluster voice packet provided in this embodiment, by further determining the signal-to-noise ratio of the decoded target voice signal, when the signal-to-noise ratio is greater than or equal to the first threshold, the target voice signal is played, so that the quality of the output cluster voice is further ensured.
Fig. 3 is a third flowchart illustrating a method for processing a cluster voice packet according to the present invention. As shown in fig. 3, the method includes:
s301, decoding the target voice packet to obtain a decoded target voice signal.
S302, determining the average value of the signal-to-noise ratio of the target voice signal and the signal-to-noise ratio of the voice signal after the second voice packet in the second transmission block is decoded.
Wherein the second transport block is a previous transport block of the first transport block.
S303, judging whether the average value is larger than or equal to a second threshold value, if so, executing S304; if not, S305 is executed.
S304, playing the target voice signal.
S305, stopping playing the target voice signal.
S301 is the same as S201 in the embodiment shown in fig. 2, and is not described again here. In S302, in addition to determining the signal-to-noise ratio of the target speech signal, the signal-to-noise ratio of the speech signal decoded from the second speech packet in the second transmission block, that is, the previous transmission block of the first transmission block, is also determined, an average value of the two signal-to-noise ratios is calculated, and the quality of the speech signal received by the terminal in a time period is determined according to the average value. If the average value is greater than or equal to the second threshold value, the second threshold value can be set according to actual conditions, the target voice signal is played if the target voice signal has good quality, and conversely, if the signal-to-noise ratio of the target voice signal is smaller than the second threshold value, the target voice signal is played if the target voice signal has poor quality, and the target voice signal is stopped playing.
Optionally, when calculating the average value of the snr, the method may further include a previous transmission block or a previous transmission block of the second transmission block, so as to obtain the snr of the voice signal received by the terminal in a relatively longer time period, and avoid a problem that the user experience is not good because only the snr of a particular voice packet is low and the voice signal is stopped to be played.
In the processing method for the cluster voice packet provided in this embodiment, by further determining the average value of the signal-to-noise ratio of the currently decoded target voice signal and the signal-to-noise ratio of the voice signal received by the terminal before, when the average value is greater than or equal to the second threshold, the target voice signal is played, and the quality of the output cluster voice is further ensured.
Fig. 4 is a schematic structural diagram of a device for processing a clustered voice packet according to the present invention. As shown in fig. 4, the apparatus 40 for processing the trunking voice packets may include:
a receiving module 401, configured to receive a first transport block sent by a network device; the first transport block contains first voice packets with voice FEC coding information.
A checking module 402, configured to perform MAC layer CRC check on the first transport block.
A determining module 403, configured to, if the CRC check result indicates that the first voice packet does not pass, correct the first voice packet in the first transport block according to the voice FEC coding information, and determine the corrected first voice packet as the target voice packet.
And a playing module 404, configured to play the target voice packet.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
The determining module 403 is further configured to: and if the CRC result indicates that the first voice packet passes the CRC check, determining the first voice packet in the first transmission block as a target voice packet.
Accordingly, the playing module 404 is configured to play the target voice packet.
On the basis of the foregoing embodiment, the playing module 404 is further specifically configured to:
if the target voice packet is decoded, obtaining a decoded target voice signal;
determining a signal-to-noise ratio of a target speech signal;
if the signal-to-noise ratio of the target voice signal is larger than or equal to a first threshold value, playing the target voice packet;
and if the signal-to-noise ratio of the target voice signal is smaller than the first threshold value, stopping playing the target voice packet.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
On the basis of the foregoing embodiment, the playing module 404 is specifically configured to:
decoding the target voice packet to obtain a decoded target voice signal;
determining the average value of the signal-to-noise ratio of the target voice signal and the signal-to-noise ratio of the voice signal after the second voice packet in the second transmission block is decoded; the second transport block is a previous transport block of the first transport block;
and if the average value is greater than or equal to a second threshold value, playing the target voice signal.
And if the average value is smaller than the second threshold value, stopping playing the target voice signal.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram of a terminal according to the present invention. As shown in fig. 5, the terminal 50 includes a memory 501 and a processor 502; the memory 501 is connected to the processor 502.
A memory 501 for storing a computer program.
A processor 502 for implementing the method for processing a trunked voice packet as in any of the above embodiments when the computer program is executed.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of processing a clustered voice packet as in any of the above embodiments.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for processing a trunked voice packet, comprising:
receiving a first transport block sent by network equipment; the first transmission block comprises a first voice packet with voice forward error correction coding information;
performing Media Access Control (MAC) layer cyclic redundancy check on the first transmission block;
if the cyclic redundancy check result indicates that the first voice packet does not pass the error correction, correcting the first voice packet in the first transmission block according to the voice forward error correction coding information, and determining the first voice packet after error correction as a target voice packet;
decoding the target voice packet to obtain a decoded target voice signal;
determining the average value of the signal-to-noise ratio of the target voice signal and the signal-to-noise ratio of the voice signal after the second voice packet in the second transmission block is decoded; wherein the second transport block is a previous transport block of the first transport block;
and if the average value is larger than or equal to a second threshold value, playing the target voice signal.
2. The method of claim 1, further comprising:
if the cyclic redundancy check result indicates that the first voice packet passes, determining the first voice packet in the first transmission block as a target voice packet;
and playing the target voice packet.
3. The method according to claim 1 or 2, wherein the playing the target voice packet comprises:
decoding the target voice packet to obtain a decoded target voice signal;
determining a signal-to-noise ratio of the target speech signal;
and if the signal-to-noise ratio of the target voice signal is greater than or equal to a first threshold value, playing the target voice signal.
4. The method of claim 3, further comprising:
and if the signal-to-noise ratio of the target voice signal is smaller than the first threshold value, stopping playing the target voice signal.
5. The method of claim 1, further comprising:
and if the average value is smaller than the second threshold value, stopping playing the target voice signal.
6. The method according to claim 1 or 2, wherein the speech packet is a narrowband speech encoded NVOC speech packet.
7. The method of claim 6, wherein the transport block comprises at least one NVOC voice packet.
8. An apparatus for processing a trunked voice packet, comprising:
the receiving module is used for receiving a first transmission block sent by network equipment; the first transmission block comprises a first voice packet with voice forward error correction coding information;
the checking module is used for carrying out Media Access Control (MAC) layer cyclic redundancy check on the first transmission block;
a determining module, configured to correct the error of the first voice packet in the first transport block according to the voice forward error correction coding information if the cyclic redundancy check result indicates that the cyclic redundancy check result does not pass, and determine the first voice packet after error correction as a target voice packet;
the playing module is used for playing the target voice packet;
the playing module is specifically configured to: decoding the target voice packet to obtain a decoded target voice signal; determining a signal-to-noise ratio of a target speech signal; if the signal-to-noise ratio of the target voice signal is larger than or equal to a first threshold value, playing the target voice packet; and if the signal-to-noise ratio of the target voice signal is smaller than the first threshold value, stopping playing the target voice packet.
9. A terminal comprising a memory and a processor; the memory is connected with the processor;
the memory for storing a computer program;
the processor, configured to implement the method for processing a trunked voice packet according to any of the claims 1 to 7 when the computer program is executed.
10. A storage medium having stored thereon a computer program for implementing a method of processing a trunked voice packet according to any of claims 1-7 when the computer program is executed by a processor.
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| CN102647255A (en) * | 2012-05-14 | 2012-08-22 | 李勇 | Method and system for transmitting data on wireless voice channel in Internet of things energy consumption monitoring |
| CN105247794A (en) * | 2013-05-03 | 2016-01-13 | 艾比奎蒂数字公司 | Iterative forward error correction decoding for fm in-band on-channel radio broadcasting systems |
| CN108616328A (en) * | 2016-12-12 | 2018-10-02 | 北京视联动力国际信息技术有限公司 | A kind of audio/video flow loss recovery method and audio/video flow transmitting terminal and receiving terminal |
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