WO2012000341A1 - 下行语音帧的接收处理方法及装置、基带 - Google Patents

下行语音帧的接收处理方法及装置、基带 Download PDF

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Publication number
WO2012000341A1
WO2012000341A1 PCT/CN2011/073032 CN2011073032W WO2012000341A1 WO 2012000341 A1 WO2012000341 A1 WO 2012000341A1 CN 2011073032 W CN2011073032 W CN 2011073032W WO 2012000341 A1 WO2012000341 A1 WO 2012000341A1
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Prior art keywords
frame
downlink
baseband
received
speech
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PCT/CN2011/073032
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English (en)
French (fr)
Inventor
孙后山
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中兴通讯股份有限公司
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Publication of WO2012000341A1 publication Critical patent/WO2012000341A1/zh

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for receiving and processing a downlink voice frame, and a baseband.
  • WCDMA Wideband Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • AMR Adaptive Multi Rate
  • speech coding technology is used for speech coding.
  • the AMR voice codec is located in a core network (Core Network, abbreviated as CN) and a user equipment (User Equipment, UE for short).
  • FIG. 1 is a schematic diagram of a voice data processing flow inside a protocol stack.
  • the radio frequency module (Radio Frequency, abbreviated as RF) is used to receive and transmit voice frames, and the audio front end (Audio) is used to input and output voice.
  • the AMR speech codec (AMR Codec) is used to implement the codec function of speech.
  • the AMR Codec interacts with the baseband through a shared Buffer for data and commands.
  • the AMR Codec and the baseband mainly perform uplink and downlink voice through the uplink data area (UL_DATA) and the downlink data area (DL_DATA) in the shared buffer (Buffer). Frame interaction.
  • the uplink: AMR Codec encoder will write a frame of data to UL_DATA every 20ms, and the baseband reads a frame of data from UL DATA every 20ms and processes it and transmits it through the air interface; : After the baseband receives the downlink speech frame from the air interface, it writes the data into the DL DATA.
  • the AMR Codec decoder reads the speech frame to be decoded from the DL DATA every 20ms, and decodes and plays the audio. Since the error rate of the wireless channel is relatively high, the frame loss phenomenon is likely to occur in the transmission of the voice, and the UE does not receive the downlink voice frame within a certain or consecutive intervals of 20 ms.
  • the downlink is asynchronous, and the baseband passively receives the physical layer (PHY) data report, and it is impossible to determine whether the frame loss phenomenon currently occurs, so that the baseband cannot fix the line speech frame to the DL DATA downlink data area every 20 ms interval.
  • the reading of the downlink speech frame in the DL_DATA by the AMR Codec decoder is fixed every 20 ms, and the loss of the speech frame in the air interface is not considered.
  • the AMR Codec decoder reads the data from the DL_DATA, the AMR Codec decoder does not The data area is cleared.
  • a primary object of the present invention is to provide a method, a device, and a baseband for receiving a downlink voice frame, so as to at least solve the above problem of user discomfort caused by frame dropping.
  • a method for receiving a downlink voice frame including: baseband periodically determining whether a downlink voice frame is received; if the baseband determines that a downlink voice frame is not received in the current period, A speech frame that does not contain valid voice information is written in the downstream data area of the buffer shared with the adaptive multi-rate speech codec.
  • the baseband periodically determines whether the downlink voice frame is received, and includes: setting a first counter and a second counter, where the first counter is used to record the number of downlink voice frames received by the baseband at the beginning of the current period, and second The counter is used to record the number of downlink speech frames that have been received by the baseband at the end of the current period; the baseband determines whether the value of the first counter is equal to the value of the second counter at the end of the current period, and if so, determines that the current period is not received. Downstream speech frame, otherwise, it is determined that the downlink speech frame is received in the current period. The baseband periodically determines whether the downlink voice frame is received. The identifier is set to indicate whether the downlink voice frame is received in the current period.
  • the identifier is set to indicate that the current period receives the downlink voice.
  • the baseband periodically determines whether the downlink voice frame is received. The baseband determines whether the downlink voice frame is received after each time the uplink voice frame is read and sent.
  • the method further includes: the AMR voice codec reading the voice frame that does not contain the valid voice information, determining The downlink speech frame is not currently received; the AMR speech codec uses an error concealment mechanism to smooth and weaken speech frames that do not contain valid speech information.
  • a receiving processing apparatus for a downlink voice frame including: a baseband, configured to periodically determine whether a downlink voice frame is received, and when determining that a downlink voice frame is not received in a current period, Writing a voice frame that does not contain valid voice information in a downlink data area of a buffer shared with the AMR voice codec; an AMR voice codec, configured to read the above-mentioned voice frame that does not contain valid voice information, ⁇ The error concealment mechanism is used to smooth and weaken speech frames that do not contain valid speech information.
  • a baseband including: a determining module, configured to periodically determine that a baseband does not receive a downlink voice frame, and if it is determined that a downlink voice frame is not received in the current period, triggering a write module
  • the write module is configured to write a speech frame that does not contain valid voice information in a downlink data area of a buffer shared by the baseband and the AMR speech codec.
  • the determining module is configured to determine whether the values of the first counter and the second counter are equal at the end of the current period, and if yes, determining that the downlink speech frame is not received in the current period, where the first counter is set to record the beginning of the current period.
  • the baseband has received the number of downlink speech frames, and the second counter is set to record the number of downlink speech frames that the baseband has received at the end of the current period.
  • the baseband further includes: a setting module, configured to: when the downlink voice frame is received, set a value of the preset identifier to indicate a value corresponding to the downlink voice frame received by the current period, and after the determining module ends, the identifier is The value is set to indicate that the current period does not receive the value corresponding to the downlink voice frame; the determining module is configured to determine, according to the value of the identifier, whether the downlink voice frame is received in the current period.
  • the judging module is further configured to determine that the baseband does not receive the downlink speech frame after the baseband reads and transmits the uplink speech frame each time.
  • the baseband determines that the downlink speech frame is not received in the current period
  • the speech frame that does not contain the valid speech information is written in the downlink data area of the buffer shared by the AMR speech codec, so that the baseband appears
  • the AMR voice codec does not continuously read the voice frame of the same voice information, thereby avoiding the decoding and playback anomaly and improving the user experience.
  • FIG. 1 is a schematic diagram of a flow processing process of a protocol stack according to a related art
  • FIG. 2 is a schematic diagram of a structure of a downlink voice frame receiving and processing apparatus according to a first embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a baseband according to Embodiment 2 of the present invention
  • FIG. 5 is a schematic structural diagram of a preferred baseband according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic structural diagram of another preferred baseband according to Embodiment 2 of the present invention
  • FIG. 7 is a flowchart of a method for receiving a downlink voice frame according to Embodiment 3 of the present invention
  • FIG. 8 is a normal diagram according to Embodiment 4 of the present invention
  • FIG. 9 is a flowchart of processing for dropping a downlink speech frame according to Embodiment 5 of the present invention.
  • FIG. 2 is a schematic structural diagram of a receiving processing apparatus for a downlink voice frame according to Embodiment 1 of the present invention, the apparatus comprising: a baseband 2 and an AMR voice codec 4.
  • the baseband 2 is configured to periodically determine whether a downlink voice frame is received, and when determining that the downlink voice frame is not received in the current period, in a downlink data area of the buffer shared with the AMR voice codec 4 ( That is, DL_DATA) writes a speech frame that does not contain valid voice information; AMR voice codec 4 is set to read the A speech frame that does not contain valid speech information is smoothed and weakened by an error concealment mechanism. In practical applications, the AMR speech codec 4 reads a speech frame from the DL DATA data area. If the read speech frame is a speech frame that does not contain valid speech information, the AMR speech codec 4 can utilize the AMR error.
  • the hidden mechanism smoothes and weakens the written non-contained voice information, so that the listener does not feel the discomfort caused by frame dropping or the like.
  • the voice frame of the baseband 2 write buffer that does not contain valid voice information may adopt the structure shown in FIG. 3, wherein the voice frame only includes the frame type, and there is no valid voice information, wherein P represents Fill bit.
  • the physical layer PHY
  • the baseband 2 monitors the interface with the physical layer. , whether the downlink speech frame is received or not, so as to determine whether the downlink speech frame is received in the current period.
  • the AMR speech codec 4 reads the speech frame to be decoded every 20 ms ⁇ DL DATA, and therefore, the period of the baseband 2 judgment is 20 ms.
  • the AMR voice codec 4 since the AMR voice codec 4 reads data from the DL DATA, the data area is not cleared. When a frame loss occurs, the voice frame currently buffered in the DL_DATA data area is cached last time. When the speech of the data area is such that the AMR speech codec 4 continuously reads the speech frame of the same speech information at the time of frame loss, the decoding playback abnormality is caused.
  • FIG. 4 is a schematic structural view of a base tape according to Embodiment 2 of the present invention, which can be used as the base tape 2 in the first embodiment.
  • the baseband 2 mainly includes: a judging module 10 and a writing module 20.
  • the determining module 10 is configured to periodically determine that the baseband does not receive the downlink voice frame, and if it is determined that the downlink voice frame is not received in the current period, trigger the writing module 20; the writing module 20 is set to be in the baseband and A speech frame that does not contain valid speech information is written in a downlink data area of a buffer shared by the AMR speech codec (for example, a speech frame of the structure shown in FIG. 3).
  • the function of the determining module 10 can be implemented by the Medium Access Control Layer (MAC), the Radio Link Control Layer (RLC), or the Voice Codec Interface Module (SCI) shown in FIG.
  • the function of module 20 can be accomplished by calling the write function of the Speech Codec Interface Module (SCI) in Figure 1.
  • FIG. 5 is a schematic structural diagram of a preferred baseband according to Embodiment 2 of the present invention.
  • two counters are set by setting: a first counter (PreCnt) and a second counter (CurCnt), respectively, which are set to record the beginning of the current cycle.
  • the first counter (PreCnt) and the second counter (CurCnt) can be set in the voice codec interface module (SCI) shown in Figure 1, and each voice codec interface module (SCI) receives one.
  • FIG. 6 is a schematic structural diagram of another preferred baseband according to Embodiment 2 of the present invention. In the preferred embodiment, whether a current period is received or not is determined by setting an identifier for indicating whether a downlink voice frame is received in a current period.
  • the baseband may further include a setting module 30, configured to: when the baseband receives the downlink voice frame, set the value of the identifier to indicate that the current period receives the value corresponding to the downlink voice frame, at the end of the current period. After the judging module 10 judges the end, the setting module 30 sets the value of the identifier to a value indicating that the downlink speech frame is not received in the current period. For example, the identifier may occupy 1 bit. When the baseband receives the downlink speech frame, the setting module 30 sets the value of the identifier to 1, and at the end of a period, after the judging module 10 makes a judgment, the setting module 30 The value of this flag is set to 0.
  • the foregoing identifier may be set in the SCI shown in FIG. 1, and the setting module 30 may be implemented in the SCI, or may be implemented in the RLC or the MAC.
  • the baseband shown in FIG. 6 it is possible to determine whether the downlink speech frame is received in the current period by setting an identifier, thereby reducing the occupied space.
  • the period in which the determining module 10 performs the determination is the same as the period in which the baseband reads the uplink voice frame, that is, the determining module 10 reads and sends the uplink every time the baseband reads. After the speech frame, the judgment base has not received the downlink speech frame.
  • the uplink data transmission is controlled by the frame interruption of the medium access control layer (MAC).
  • MAC medium access control layer
  • the MAC is interrupted according to the frame every predetermined time interval (for example, 20 ms).
  • the MAC can ensure that the uplink read can be performed strictly every predetermined time interval (20ms).
  • FIG. 7 is a flowchart of a method for receiving a downlink voice frame according to Embodiment 3 of the present invention. The method mainly includes the following steps: Step S702: The current period ends, and the baseband determines whether the current period is received.
  • Downstream speech frame if yes, go to step S706, otherwise, go to step S704; for example, two counters can be set: first counter and second counter, wherein the first counter is set to record that the baseband has been received at the beginning of the current period The number of downlink speech frames, the second counter is set to record the number of downlink speech frames received by the baseband at the end of the current period, and at the end of the current period, by determining whether the value of the first counter is equal to the value of the second counter, It is judged whether the downlink speech frame is received in the current cycle.
  • an identifier may be set, and the identifier indicates whether the downlink voice frame is received in the current period.
  • the value of the identifier indicates that the downlink voice frame is not received in the current period, and when the baseband receives the downlink voice frame, The value of the flag is set to indicate that the current period receives the downlink
  • the value corresponding to the audio frame is determined according to the value of the identifier at the end of the current period. After the determination is completed, the value of the identifier is re-set to an initial value (ie, indicating that the current period does not receive the value corresponding to the downlink voice frame). After the start of the next period, when the downlink speech frame is received, the value of the identifier is set to indicate that the value corresponding to the downlink speech frame is received in the current period, and the periodic execution is performed.
  • Step S704 the baseband writes a voice frame that does not contain valid voice information in the DL_DATA of the buffer shared by the AMR voice codec; for example, the voice frame (ie, the NO_DATA voice frame) that does not contain the valid voice information may be Use the frame structure shown in Figure 3.
  • Step S706 the AMR voice codec reads the voice frame buffered in the DL DATA.
  • the AMR speech codec can use the error concealment mechanism to smooth and weaken the speech frame, so that the listener can feel Not enough discomfort caused by frame loss.
  • AMR is described in the 3GPP TS 26 series protocol.
  • AMR also has Error Concealment Unit (abbreviated as
  • ECU ECU
  • the purpose of ECU technology is to avoid the negative effects of frame loss and bad frame on the decoding quality of the receiving end, that is, when the speech frame is lost and damaged, in order not to make the listener feel the frame loss and bad frame.
  • the AMR speech codec is notified to perform error concealment during decoding, and speech synthesis is performed using the predicted parameters. If continuous frame dropping and bad frames occur, the technique of weakening the sound is used to let the listener know that the transmission is interrupted.
  • FIG. 8 is a flowchart according to Embodiment 4 of the present invention.
  • two counters respectively record the number of downlink speech frames (PreCnt) that have been received in the previous detection and are currently received.
  • the process of receiving the normal downlink voice frame mainly includes the following steps: Step S801, the physical layer (PHY) receives the downlink voice data, and the process starts, and the process proceeds to step S802; S802, the PHY performs CRC check on the received downlink voice data, and proceeds to step S803.
  • Step S803 the PHY delivers the downlink voice data and the CRC check result to the baseband radio link control layer (RLC) through the baseband MAC.
  • Step S804 the RLC adjusts the write function provided by the SCI of the baseband, prepares to write the received downlink voice data into the DL_DATA data area of the shared Buffer, and proceeds to step S805; Step 4 gathers S805, and the SCI completes the voice frame substream and the RBid.
  • RLC radio link control layer
  • Step S806 the SCI writes the constructed speech frame In the DL_DATA data area, for AMR Codec to perform decoding and playback, the process goes to step S807; in step S807, the downlink voice frame reception processing flow ends, waiting for the reception of the next downlink speech frame.
  • the fifth embodiment is described in the fifth embodiment of the present invention, and the processing procedure of the embodiment of the present invention is used to describe the processing flow of the downlink voice frame drop frame.
  • Step S901 a frame interruption of a 20 ms transmission voice arrives, and proceeds to step S902;
  • This step 4 can be performed after step 4 of S807 shown in FIG.
  • Step S902 the MAC tone interrupt processing function (ISR) performs the uplink transmission process of the voice frame, and proceeds to step S903;
  • Step S903 the MAC acquires the voice data block size to be transmitted on the logical channel corresponding to the voice service, and proceeds to step S904;
  • Step S904 RLC tone
  • the read function of the SCI reads the uplink voice frame in the UL DATA data area, and proceeds to step S905; in step S905, the SCI completes mapping between the voice frame substream and the radio bearer identifier (Radio Bearer Identify, RBid for short) in the read function, and each The substream bit data and the length are returned to the RLC, and the MAC is notified, and the process proceeds to step S906.
  • the radio bearer identifier Radio Bearer Identify, RBid for short
  • step S906 the MAC performs a transport format combination (Transport Format Combination (TFC) selection according to the obtained voice channel block size of each logical channel. If the selection is successful, the process proceeds to step S908; otherwise, S907 is directly executed.
  • TFC Transport Format Combination
  • Step S907 the RLC releases the uplink voice frame data through the SCI; and proceeds to step S 909; Step S908, the RLC writes the uplink voice frame to the shared Buffer between the protocol stack and the PHY according to the TFC selection result of the MAC, for the PHY For further processing and sending out through the air interface; go to step S909; Step S909, in the MAC interrupt processing function ISR, after processing the uplink process, adjust the SCI check function to determine whether a downlink speech frame is received within the current 20 ms interval, ie Obtaining by comparing the counters PreCnt and CurCnt; if there is data received, proceeding to step S910; otherwise, proceeding to step S911; step S910, updating the CurCnt value, proceeding to step 4 to gather S912; step S911, the MAC-switching SCI write function to the DL_DATA The NO_DATA voice frame is written in the data area, and the process proceeds to step S912; the step 4 is gathered to
  • whether the downlink speech frame is received in the current time interval is determined by the uplink frame interruption with the strict time concept in the self-developed protocol stack.
  • a frame loss occurs, fill in the NO_D ATA voice frame in the DL_D ATA data area, clear the previous frame residual in the data area, and use the AMR mechanism to decode and play the sound, thereby reducing the decoding quality caused by the frame loss in the transmission.
  • the phenomenon Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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  • Mobile Radio Communication Systems (AREA)

Description

下^ f亍语音帧的接收处理方法及装置、 基带 技术领域 本发明涉及通信领域， 具体而言， 涉及一种下行语音帧的接收处理方法 及装置、 基带。 背景技术 在第三代宽带码分多址接入 ( Wideband Code Division Multiple Access, 简称为 WCDMA ) /时分同步码分多址接入 ( Time Division- Synchronous Code Division Multiple Access, 简称为 TD-SCDMA ) 移动通信系统中使用了自适 应多速率（ Adaptive Multi Rate, 简称为 AMR )语音编码技术进行语音编码。 在 WCDMA/TD-SCDMA移动通信系统中， AMR语音编解码器位于核心网 ( Core Network, 简称为 CN ) 和用户设备 ( User Equipment, 简称为 UE ) 中。 图 1是协议栈内部语音数据处理流程的示意图。 其中， 射频模块（Radio Frequency, 简称为 RF )用于接收和发射语音帧， 语音前端 （ Audio )用于输 入和输出语音。 在图 1 中， AMR语音编解码器 （AMR Codec ) 用于实现语 音的编解码功能。 其中 AMR Codec与基带间通过一个共享 Buffer进行数据 和命令的交互。 在通用移动通信系统 ( Universal Mobile Telecommunications System, 简 称为 UMTS )模式下， AMR Codec与基带间主要通过共享緩冲区 （ Buffer ) 中上行数据区 （UL_DATA ) 和下行数据区 （DL_DATA ) 进行上下行语音帧 的交互。 对于语音通话的正常流程， 如图 1所示， 上行： AMR Codec编码器会每 隔 20ms向 UL_DATA中写一帧数据，基带每 20ms从 UL DATA读一帧数据 经过处理并通过空口传送出去； 下行： 基带从空口接收到下行语音帧后， 将 数据写入 DL DATA中， AMR Codec解码器会每隔 20ms从 DL DATA中读 取待解码语音帧， 进行解码放音。 由于无线信道的误码率比较高， 语音在传输中很容易出现丢帧现象， 造 成 UE在某个或连续几个 20ms间隔内接收不到下行语音帧。 同时由于基带 侧协议栈实现中， 下行是异步的， 基带被动接收物理层（PHY )的数据上报， 无法判定当前是否出现丢帧现象， 造成基带不能固定每 20ms 间隔向 DL DATA下行数据区写下行语音帧。 而 AMR Codec解码器对 DL_DATA中 下行语音帧的读取是固定每 20ms读取一次， 不会考虑空口中语音帧的丢失， 同时 AMR Codec解码器从 DL_DATA中读取完数据后， 不会对该数据区进 行清除。这样当出现丢帧时， AMR Codec解码器会连续读取到同样的语音帧， 造成解码放音异常， 会使用户产生不适。 发明内容 本发明的主要目的在于提供一种下行语音帧的接收处理方法、 装置及基 带， 以至少解决上述由于丢帧而导致用户产生不适的问题。 根据本发明的一个方面，提供了一种下行语音帧的接收处理方法， 包括： 基带周期性地判断有没有接收到下行语音帧； 基带如果确定在当前周期没有 接收到下行语音帧， 则在其与自适应多速率语音编解码器共享的緩冲区的下 行数据区中写入不包含有效语音信息的语音帧。 其中， 基带周期性地判断有没有接收到下行语音帧包括： 设置第一计数 器和第二计数器， 其中， 第一计数器用于记录当前周期开始时基带已接收到 的下行语音帧的数量， 第二计数器用于记录当前周期结束时基带已接收到的 下行语音帧的数量； 基带在当前周期结束时判断第一计数器的值与第二计数 器的值是否相等， 如果是， 则确定当前周期没有接收到下行语音帧， 否则， 确定当前周期有接收到下行语音帧。 其中， 基带周期性地判断有没有接收到下行语音帧包括： 设置指示当前 周期是否接收到下行语音帧的标识， 在接收到下行语音帧时， 将标识的值设 置为指示当前周期接收到下行语音帧对应的值； 基带在当前周期结束时根据 标识的值判断当前周期是否接收到下行语音帧， 在判断结束后， 将标识的值 设置为指示当前周期没有接收到下行语音帧对应的值。 其中， 基带周期性地判断有没有接收到下行语音帧包括： 基带在每次读 取并发送上行语音帧之后， 判断有没有接收到下行语音帧。 其中， 在基带在下行数据区中写入不包含有效语音信息的语音帧之后， 方法还包括： AMR语音编解码器读取不包含有效语音信息的语音帧， 确定 当前没有接收到下行语音帧； AMR语音编解码器釆用错误隐藏机制对不包 含有效语音信息的语音帧进行平滑和弱化处理。 根据本发明的另一方面，提供了一种下行语音帧的接收处理装置， 包括： 基带， 设置为周期性地判断有没接收到下行语音帧， 在确定当前周期没有接 收到下行语音帧时， 在其与 AMR语音编解码器共享的緩冲区的下行数据区 中写入不包含有效语音信息的语音帧； AMR语音编解码器， 设置为读取上 述不包含有效语音信息的语音帧， 釆用错误隐藏机制对不包含有效语音信息 的语音帧进行平滑和弱化处理。 根据本发明的再一个方面， 提供了一种基带， 包括： 判断模块， 设置为 周期性地判断基带有没有接收到下行语音帧， 如果确定当前周期没有接收到 下行语音帧， 则触发写入模块； 写入模块， 设置为在基带与 AMR语音编解 码器共享的緩冲区的下行数据区中写入不包含有效语音信息的语音帧。 其中， 判断模块设置为在当前周期结束时判断第一计数器与第二计数器 的值是否相等， 如果是， 则确定当前周期没有接收到下行语音帧， 其中， 第 一计数器设置为记录当前周期开始时基带已接收到下行语音帧的数量， 第二 计数器设置为记录当前周期结束时基带已接收到下行语音帧的数量。 其中， 基带还包括： 设置模块， 设置为在接收到下行语音帧时， 将预先 设置的标识的值设置为指示当前周期接收到下行语音帧对应的值， 在判断模 块判断结束后， 将标识的值设置为指示当前周期没有接收到下行语音帧对应 的值； 判断模块设置为根据标识的值判断当前周期是否接收到下行语音帧。 其中， 判断模块还设置为在基带每次读取并发送上行语音帧之后判断基 带有没有接收到下行语音帧。 通过本发明， 基带在判断当前周期没有接收到下行语音帧时， 在其与 AMR语音编解码器共享的緩冲区的下行数据区中写入不包含有效语音信息 的语音帧， 从而使得在出现丢帧时， AMR语音编解码器不会连续读取到同 样语音信息的语音帧， 进而避免了解码放音异常， 提高了用户体验。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1是根据相关技术的协议栈内部语音处理流程的示意图； 图 2 是根据本发明实施例一的下行语音帧的接收处理装置的结构示意 图； 图 3是本发明实施例一中基带写入緩冲区的不包含有效语音信息的语音 帧的结构示意图； 图 4是根据本发明实施例二的基带的结构示意图； 图 5是 居本发明实施例二的优选基带的结构示意图； 图 6是 居本发明实施例二的另一优选基带的结构示意图； 图 7是根据本发明实施例三的下行语音帧的接收处理方法流程图； 图 8是根据本发明实施例四的正常下行语音帧接收处理流程图； 图 9是根据本发明实施例五的针对下行语音帧丢帧的处理流程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 图 2 为才艮据本发明实施例一的下行语音帧的接收处理装置的结构示意 图， 该装置包括： 基带 2和 AMR语音编解码器 4。 其中， 基带 2 , 设置为周 期性地判断有没接收到下行语音帧， 在确定当前周期没有接收到下行语音帧 时，在其与 AMR语音编解码器 4共享的緩冲区的下行数据区（即 DL_DATA ) 中写入不包含有效语音信息的语音帧； AMR语音编解码器 4 , 设置为读取该 不包含有效语音信息的语音帧， 釆用错误隐藏机制对该语音帧进行平滑和弱 化处理。 在实际应用中， AMR语音编解码器 4从 DL DATA数据区中读取语音帧， 如果读取的语音帧为不包含有效语音信息的语音帧， 则 AMR语音编解码器 4可以利用 AMR的错误隐藏机制 （ECU )对写入的不包含有效语音信息的 进行平滑和弱化等处理， 可以使听者感觉不到丢帧等原因造成的不适。 优选地， 基带 2写入緩冲区的不包含有效语音信息的语音帧可以釆用如 图 3所示的结构， 其中， 该语音帧仅包含帧类型， 没有任何有效语音信息， 其中， P表示填充位。 在实际应用中， 如图 1所示， 物理层 （PHY ) 在接收到射频模块接收到 的下行语音帧时， 主动将接收到下行语音帧上报到基带 2 , 基带 2通过监听 与物理层的接口， 可以获取是否接收到下行语音帧上， 从而判断当前周期是 否有接收到下行语音帧。 在 WCDMA/TD-SCDMA移动通信系统中， AMR语音编解码器 4每隔 20ms λ DL DATA中读取待解码语音帧， 因此， 基带 2判断的周期为 20ms。 相关技术中由于 AMR语音编解码器 4从 DL DATA中读取完数据后， 不会对该数据区进行清除， 当出现丢帧时， 当前緩存在 DL_DATA数据区的 语音帧为上一次緩存在该数据区的语音时， 从而使得在丢帧时 AMR语音编 解码器 4会连续读取到相同语音信息的语音帧， 从而导致解码放音异常。 而 本发明实施例提供的上述装置中， 基带 2在判断出当前周期没有接收到下行 语音帧时， 向緩冲区内写入不包含有效语音信息的语音帧，从而避免了 AMR 语音编解码器 4连续读取到相同语音信息的语音帧， 进而避免了解码放音异 常， 提高了用户体验。 实施例二 图 4为根据本发明实施例二的基带的结构示意图， 该基带可以作为上述 实施例一中的基带 2。 该基带 2主要包括： 判断模块 10和写入模块 20。 其 中， 判断模块 10， 设置为周期性地判断该基带有没有接收到下行语音帧， 如 果确定当前周期没有接收到下行语音帧， 则触发写入模块 20; 写入模块 20 , 设置为在基带与 AMR语音编解码器共享的緩冲区的下行数据区中写入不包 含有效语音信息的语音帧 （例如， 图 3所示结构的语音帧；)。 在实际应用中， 判断模块 10的功能可以由图 1所示的媒体接入控制层 ( MAC )、 无线链路控制层（ RLC )或语音编解码器接口模块（ SCI )中实现， 而写入模块 20的功能可以通过调用图 1中的语音编解码器接口模块 （SCI ) 的写函数完成。 通过本发明实施例二的基带， 在检测到当前周期没有接收到下行语音帧 时， 在与 AMR语音编解码器共享的 Buffer中的 DL_DATA中写入不包含有 效语音信息的语音帧， 从而避免了在丢帧时 AMR语音编解码器连续读取相 同语音信息的语音帧而导致解码放音异常的问题。 图 5为根据本发明实施例二的优选基带的结构示意图， 在本优选实施例 中， 通过设置两个计数器： 第一计数器 （PreCnt ) 和第二计数器 （ CurCnt ), 分别设置为记录当前周期开始前基带已接收到的下行语音帧的数量和当前周 期结束时基带已接收到下行语音帧的数量， 判断模块 10 在当前周期结束时 通过比较 PreCnt和 CurCnt的值是否相同， 从而判断当前周期是否接收到下 行语音帧。 具体地， 如果 PreCnt与 CurCnt的值相同， 则说明当前周期内没 有接收到下行语音帧； 否则， 说明当前周期内接收到有下行语音帧， 并令 PreCnt = CurCnt, CurCnt继续计算基带接收到的下行语音帧的数量。 在实际应用中， 第一计数器 （ PreCnt ) 和第二计数器 （ CurCnt ) 可以设 置在图 1 所示的语音编解码器接口模块 （SCI ) 中， 语音编解码器接口模块 ( SCI )每接收到一个下行语音帧， CurCnt加 1 ,并在一个周期结束后， PreCnt = CurCnt。 通过该优选实施例， 可以通过两个计数器判断当前周期是否接收到下行 语音帧， 其实现简单易行。 图 6为 居本发明实施例二的另一优选基带的结构示意图， 在本优选实 施例中， 通过设置一个用于指示当前周期是否接收到下行语音帧的标识来判 断当前周期是否接收到有下行语音帧。 如图 6所示， 该基带还可以包括设置 模块 30 , 设置为在基带接收到下行语音帧时， 将该标识的值设置为指示当前 周期接收到下行语音帧对应的值， 在当前周期结束时， 判断模块 10 判断结 束后， 设置模块 30 将该标识的值设置为指示当前周期没接收到下行语音帧 对应的值。 例如， 该标识可以占用 1个比特位， 当基带接收到下行语音帧时， 设置模块 30将该标识的值设置为 1 , 而在一个周期结束时， 判断模块 10作 出判断后， 设置模块 30将该标识的值设置为 0。 在实际应用中， 上述标识可以设置在图 1所示的 SCI中， 而设置模块 30 可以在 SCI中实现， 也可以在 RLC或 MAC中实现。 通过图 6所示的基带， 可以通过设置一个标识判断当前周期是否有接收 到下行语音帧， 从而可以减少占用的空间。 优选地， 在上述图 4至图 6所示的基带中， 上述判断模块 10进行判断 釆用的周期与基带读取上行语音帧的周期相同， 即判断模块 10 在基带每次 读取并发送上行语音帧之后判断基带有没有接收到下行语音帧。 这样可以避 免另外设置定时器来触发判断模块 10。 在实际应用中， 自研协议栈实现中， 上行数据的发送是由媒体接入控制 层 （MAC ) 的帧中断控制的， 当传输语音时， MAC会根据帧中断每预定时 间间隔 （例如， 20ms )读取并发送语音帧一次。 因为上行优先级高于下行， 因此在 MAC可以保证上行的读取可以严格每预定时间间隔 （ 20ms ) 执行一 次， 因此， 在帧中断处理函数中， 当 MAC (即判断模块 10 ) 处理完上行语 音帧数据后， 可以增加对下行语音计数 PreCnt和 CurCnt的比较， 或读取指 示当前周期是否接收到下行语音帧的标识， 判定当前时间间隔内是否接收到 有下行语音数据。 实施例三 图 7为才艮据本发明实施例三的下行语音帧的接收处理方法的流程图， 该 方法主要包括以下步 4聚： 步骤 S702,当前周期结束，基带判断当前周期是否接收到有下行语音帧， 如果是， 执行步骤 S706, 否则， 执行步骤 S704; 例如， 可以设置两个计数器： 第一计数器和第二计数器， 其中， 第一计 数器设置为记录当前周期开始时基带已接收到的下行语音帧的数量， 第二计 数器设置为记录当前周期结束时基带已接收到的下行语音帧的数量， 在当前 周期结束时， 通过判断第一计数器的值与第二计数器的值是否相等， 可以判 断当前周期是否接收到下行语音帧。 或者， 也可以设置一个标识， 通过该标识来指示当前周期是否接收到下 行语音帧， 初始时， 该标识的取值指示当前周期没有接收到下行语音帧， 当 基带接收到下行语音帧时， 将该标识的值设置为指示当前周期接收到下行语 音帧对应的值， 在当前周期结束时， 根据该标识的值进行判断， 判断结束后， 将该标识的值再置为初始值 （即指示当前周期没有接收到下行语音帧对应的 值），在下一个周期开始后， 当接收到下行语音帧时再将该标识的值设置为指 示当前周期接收到下行语音帧对应的值， 如此周期性的执行。 例如， 如果在 当前周期结束时， 该标识的值为 1 , 则指示当前周期接收到有下行语音帧， 如果该标识的值为 0, 则指示当前周期没有接收到下行语音帧； 在下一个周 期开始时， 将该标识的值重新置为 0, 在接收到下行语音帧时， 再将该标识 的值设置为 1 , 如此反复。 步骤 S704, 基带在其与 AMR语音编解码器共享的緩冲区的 DL_DATA 中写入不包含有效语音信息的语音帧； 例如， 该不包含有效语音信息的语音帧 （即 NO_DATA语音帧） 可以釆 用如图 3所示的帧结构。 步骤 S706, AMR语音编解码器读取 DL DATA中緩存的语音帧。 如果 AMR 语音编解码器读取的语音帧为不包含有效语音信息的语音 帧， 则 AMR语音编解码器可以釆用错误隐藏机制对的语音帧进行平滑和弱 化等处理， 从而可以使听者感觉不到丢帧待原因造成的不适。 在实际应用中， AMR除了具有自适应多速率编码功能外，才艮据 3GPP TS 26系列协议描述， AMR还具有错误隐藏 （Error Concealment Unit, 简称为
ECU )技术。 ECU技术的目的就是为了避免丢帧和坏帧对接收端解码质量带 来的负面效应， 即当出现语音帧丢失和损坏的情况时， 为了不使听的人感觉 到丢帧和坏帧， 应该通知 AMR语音编解码器在解码时进行差错隐藏， 并用 预测的参数进行语音合成， 如果出现连续丢帧和坏帧， 则釆用声音弱化的技 术让听者知道传输被中断。 通过本发明实施例三提供的上述技术方案， 当下行出现丢帧时， 向 DL DATA数据区中填写 NO_DATA语音帧， 从而清除该数据区中先前的帧 残留， 并利用 AMR的机制进行解码并放音， 从而降低因传输中出现丢帧影 响解码质量的现象。 实施例四 图 8为根据本发明实施例四的流程图， 在本实施例中， 釆用两个计数器 分别记录前次检测时已接收到的下行语音帧的数量 （PreCnt ) 和当前已接收 到的下行语音帧的数量 （ CurCnt )。 如图 8所示， 在本发明实施例中， 正常下行语音帧的接收处理流程主要 包括以下步 4聚： 步骤 S801 , 物理层（PHY )接收到下行语音数据， 流程开始， 进入步骤 S802; 步骤 S802, PHY对接收到的下行语音数据进行 CRC 校验， 进入步骤 S803; 步骤 S803 , PHY将下行语音数据和 CRC校验结果通过基带的 MAC投 递给基带的无线链路控制层 （RLC ), 进入步骤 S804; 步骤 S804, RLC调基带的 SCI提供的写函数， 准备将接收的下行语音 数据写入共享 Buffer的 DL_DATA数据区中， 进入步骤 S805; 步 4聚 S805 , SCI完成语音帧子流和 RBid之间的映射， 并才艮据各子流大 小及 CRC校-险结果构造带帧头的完整语音帧， 同时， 将 CurCnt加 1 , 进入 步骤 S806; 步骤 S806 , SCI将构造的语音帧写入 DL_DATA数据区中，供 AMR Codec 进行解码放音， 则进入步骤 S807; 步骤 S807, 下行语音帧接收处理流程结束， 等待下一个下行语音帧的接 收。 实施例五 在本发明实施例五中， 以判断的周期为 20ms为例， 对釆用本发明实施 例提供的技术方案针对下行语音帧丢帧的处理流程进行描述。 图 9为 居本 发明实施例五的针对下行语音帧丢帧的处理流程图， 主要包括以下步骤： 步骤 S901 , 传输语音的 20ms的帧中断到来， 进入步骤 S902; 该步 4聚可以在图 8所示的步 4聚 S807之后执行。 步骤 S902 , MAC调中断处理函数 （ ISR ) 进行语音帧的上行传输处理， 进入步骤 S903; 步骤 S903 , MAC获取语音业务对应逻辑信道上待传输语音数据块大小， 进入步骤 S904; 步骤 S904, RLC调 SCI的读函数读取 UL DATA数据区中上行语音帧， 进入步骤 S905; 步骤 S905 , SCI 在读函数中完成语音帧子流和无线承载标识 （Radio Bearer Identify，简称为 RBid )间映射，并将各子流 bit数据及长度返回给 RLC , 进而通知 MAC, 进入步骤 S906; 步骤 S906, MAC根据获取到的各逻辑信道语音数据块大小， 进行传输 格式组合（Transport Format Combination, 简称为 TFC )选择， 若选择成功， 进入步骤 S908; 否则直接执行 S907。 步骤 S907, RLC释放通过 SCI读取到上行语音帧数据； 进入步骤 S 909; 步骤 S908, RLC根据 MAC的 TFC选取结果， 将上行语音帧写到协议 栈和 PHY间交互的共享 Buffer中， 供 PHY作进一步处理并通过空口发送出 去； 进入步骤 S909; 步骤 S909,在 MAC中断处理函数 ISR中， 当处理完上行流程后，调 SCI 的检验函数判定当前 20ms 间隔内是否有下行语音帧被接收， 即通过比较计 数器 PreCnt和 CurCnt获知； 若有数据被接收到， 进入步骤 S910; 否则， 进 入步骤 S911; 步骤 S910, 更新 CurCnt取值， 进入步 4聚 S912; 步骤 S911 , MAC调 SCI的写函数向 DL_DATA数据区中写 NO_DATA 语音帧， 进入步骤 S912; 步 4聚 S912, 下行丢帧的处理流程结束， 等待下一次帧中断的到来。 从以上的描述中， 在本发明实施例中， 通过自研协议栈中具有严格时间 概念的上行帧中断， 来判定当前时间间隔内是否有接收到下行语音帧， 当下 行出现丢帧时， 向 DL_D ATA数据区中填写 NO_D ATA语音帧， 清除该数据 区中先前的帧残留， 并利用 AMR的机制进行解码并放音， 从而降低因传输 中出现丢帧影响解码质量的现象。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种下行语音帧的接收处理方法， 包括：
基带周期性地判断有没有接收到下行语音帧；
所述基带如果确定在当前周期没有接收到所述下行语音帧， 则在 其与自适应多速率 AMR语音编解码器共享的緩冲区的下行数据区中 写入不包含有效语音信息的语音帧。
2. 根据权利要求 1所述的方法， 其中， 所述基带周期性地判断有没有接 收到下行语音帧包括：
设置第一计数器和第二计数器， 其中， 所述第一计数器用于记录 所述当前周期开始时所述基带已接收到的所述下行语音帧的数量， 所 述第二计数器用于记录所述当前周期结束时所述基带已接收到的所述 下行语音帧的数量；
所述基带在所述当前周期结束时判断所述第一计数器的值与所述 第二计数器的值是否相等， 如果是， 则确定所述当前周期没有接收到 所述下行语音帧， 否则， 确定所述当前周期有接收到所述下行语音帧。
3. 根据权利要求 1所述的方法， 其中， 所述基带周期性地判断有没有接 收到下行语音帧包括：
设置指示所述当前周期是否接收到所述下行语音帧的标识， 在接 收到所述下行语音帧时， 将所述标识的值设置为指示所述当前周期接 收到所述下行语音帧对应的值；
所述基带在所述当前周期结束时才艮据所述标识的值判断所述当前 周期是否接收到所述下行语音帧， 在判断结束后， 将所述标识的值设 置为指示所述当前周期没有接收到所述下行语音帧对应的值。
4. 根据权利要求 1至 3 中任一项所述的方法， 其中， 所述基带周期性地 判断有没有接收到下行语音帧包括：
所述基带在每次读取并发送上行语音帧之后， 判断有没有接收到 所述下行语音帧。
5. 根据权利要求 1至 3 中任一项所述的方法， 其中， 在所述基带在所述 下行数据区中写入不包含有效语音信息的语音帧之后， 所述方法还包 括：
所述 AMR语音编解码器读取所述不包含有效语音信息的语音帧， 确定当前没有接收到所述下行语音帧；
所述 AMR语音编解码器釆用错误隐藏机制对所述不包含有效语 音信息的语音帧进行平滑和弱化处理。
6. —种基带， 包括：
判断模块， 设置为周期性地判断所述基带有没有接收到下行语音 帧， 如果确定当前周期没有接收到所述下行语音帧， 则触发写入模块； 所述写入模块， 设置为在所述基带与 AMR语音编解码器共享的 緩冲区的下行数据区中写入不包含有效语音信息的语音帧。
7. 根据权利要求 6所述的基带， 其中， 所述判断模块用于在所述当前周 期结束时判断第一计数器与所述第二计数器的值是否相等， 如果是， 则确定所述当前周期没有接收到所述下行语音帧， 其中， 所述第一计 数器用于记录所述当前周期开始时所述基带已接收到所述下行语音帧 的数量， 所述第二计数器用于记录所述当前周期结束时所述基带已接 收到所述下行语音帧的数量。
8. 根据权利要求 6所述的基带， 其中， 所述基带还包括：
设置模块， 设置为在接收到所述下行语音帧时， 将预先设置的标 识的值设置为指示所述当前周期接收到所述下行语音帧对应的值， 在 所述判断模块判断结束后， 将所述标识的值设置为指示所述当前周期 没有接收到所述下行语音帧对应的值；
所述判断模块设置为根据所述标识的值判断所述当前周期是否接 收到所述下行语音帧。
9. 根据权利要求 6至 8中任一项所述的基带， 其中， 所述判断模块还设 置为在所述基带每次读取并发送上行语音帧之后判断所述基带有没有 接收到所述下行语音帧。
10. —种下行语音帧的接收处理装置， 包括： 基带， 设置为周期性地判断有没接收到下行语音帧， 在确定当前 周期没有接收到所述下行语音帧时， 在其与 AMR语音编解码器共享 的緩冲区的下行数据区中写入不包含有效语音信息的语音帧；
所述 AMR语音编解码器， 设置为读取所述不包含有效语音信息 的语音帧， 釆用错误隐藏机制对所述不包含有效语音信息的语音帧进 行平滑和弱化处理。
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