Gesproken tekst vertalen, offlinefuncties, synoniemen, vervoegingen, educatieve spelletjes
Publiciteit
Registreer gratis: toegang tot meer resultaten en functies
encoder bit rate
Vertaling van "encoder bit rate" in Chinees
FIG. 3 is a functional block diagram illustrating channel throughput estimation and encoder bit rate adjustment in accordance with an embodiment of the present invention. In the disclosed embodiment, the encoder rate adaptation layer 200 operates to adaptively effect alterations in the encoding parameters of the encoder 204 in response to estimates of wireless channel throughput based on at least one throughput indicia 302. The combination of predictive estimates of channel conditions and adaptive video encoding result in improved error concealment, error resilience, ability to meet wireless latency requirements, and bandwidth usage during, for example, real-time video encoding for packet network transmission.
图3为根据本发明一个实施例的信道吞吐量估计和编码器比特率调整的功能框图。在公开实施例中，所述编码器数据率自适应层200用于响应基于至少一个吞吐量指标302的无线信道吞吐量估值而自适应地对编码器204的编码参数进行改变。信道状态预测估值和自适应视频编码的结合提高了错误隐藏、错误恢复、满足无线等待时间要求的能力，以及（例如）用于分组网络传输的实时视频编码期间的带宽利用。
FIG. 3 is a functional block diagram illustrating channel throughput estimation and encoder bit rate adjustment in accordance with an embodiment of the present invention.
图3为根据本发明一个实施例的信道吞吐量估计和编码器比特率调整的功能框图。
In one embodiment according to the present invention, the estimated throughput table 306 or equivalent is computed dynamically as shown generally by step 512. In step 512, which may occur at other points in the illustrated method, estimated target encoder rates are refreshed following a change in one or more throughput indicia 302 as described above in conjunction with FIG. 3. In the disclosed embodiment, step 504 is repeated following an update to Tr value(s) in step 512. In this embodiment, adjustments to an encoder bit rate can thus occur following a new or pending PHY data rate selection, or a change in indicia of available throughput.
在根据本发明的一个实施例中，所述估计吞吐量表306或等同物以动态方式计算，总体如步骤512所示。步骤512可在所示方法的其他点进行，在步骤512中，估计目标编码器比特率在图3所示的一个或多个吞吐量指标302的变化之后更新。在公开实施例中，在步骤512中更新Tr值之后，重复步骤504。因此，在该实施例中，对编码器比特率的调整可在新的或未决PHY数据率选择之后，或在可用吞吐量的指标变化之后进行。
In the illustrated encoder rate adaptation layer 200, various throughput indicia 302 are congregated and analyzed by a channel throughput estimation 300 function. The channel throughput estimation 300 utilizes the received throughput indicia 302 to generate channel throughput estimations may include, for example, expected supportable throughputs for a plurality of supported PHY data rates (PHY rate), or a revised throughput estimation for a given PHY rate based on changes in the throughput indicia 302. Output from the channel throughput estimation 300 process is provided to encoder bit rate adjustment 304 functionality for use in adaptively altering one or more encoding parameters (e.g., bit rate) of the encoder 204.
在所示编码器数据率自适应层200中，各个吞吐量指标302由信道吞吐量估计300功能进行聚集和分析。信道吞吐量估计300利用接收的吞吐量指标302生成信道吞吐量估值。这些估值可包括，例如，多个被支持PHY数据率（PHY率）的预期可支持吞吐量，或基于吞吐量指标302的变化而修改的指定PHY率的吞吐量估值。对编码器比特率调整304功能提供信道吞吐量估计300程序的输出，用于自适应地改变编码器204的一个或多个编码参数（例如，比特率）。
In addition to or in lieu of encoder bit rate parameters, estimated channel throughput information may be used to adjust other video encoding parameters, such frame rate or use of different frame types. For example, the use of intra-frame prediction in the video coding process might be restricted for estimated channel throughputs or expected PHY data rates below a certain threshold. For such estimated channel throughputs or PHY data rates, the video encoder could be instructed to make greater use of inter-frame prediction in order to improve channel utilization. Additional such embodiments are described below in conjunction with FIG. 10.
除编码器比特率参数之外，或代替编码器比特率参数，可使用估计信道吞吐量信息调整器他视频编码参数，例如，帧速率或不同帧类型的使用。例如，对于低于特定阈值的估计信道吞吐量或预期PHY数据率，视频编码过程中帧内预测的使用可能会受到限制。对于这种估计信道吞吐量或PHY数据率，可指示所述视频编码器更充分利用帧内预测，以提高信道利用率。其他这种实施例如下文根据图10所述。
The method of claim 4, wherein generating an estimate of the upcoming throughput of the wireless channel comprises generating a target encoder bit rate for at least one MCS/PHY data rate.
根据权利要求4所述的方法，其特征在于，生成无线信道将来吞吐量的估值包括：为至少一个MCS/PHY数据率生成目标编码器比特率。
The method of claim 7, further comprising lowering the current encoder bit rate if the current encoder bit rate is greater than the target encoder bit rate or increasing the current encoder bit rate if the current encoder bit rate is less than the target encoder bit rate.
根据权利要求7所述的方法，进一步包括：如果当前编码器比特率大于目标编码器比特率，降低当前编码器比特率，或者，如果当前编码器比特率小于目标编码器比特率，提高当前编码器比特率。
encoder bit rate adaptation circuitry operable to adaptively adjust an encoding bit rate of the encoder, wherein the encoding bit rate is adjusted based on an estimate of wireless channel throughput derived from at least one transmitter side indication of wireless channel throughput.
可用于自适应地调整编码器的编码比特率的编码器比特率自适应电路，其中，所述编码比特率根据来自无线信道吞吐量的至少一个发送侧指标的无线信道吞吐量估值进行调整。
FIG. 5 is a flow diagram illustrating a method for adaptively adjusting an encoder bit rate in accordance with an embodiment of the present invention.
图5为根据本发明一个实施例的编码器比特率自适应调整方法的流程图。
FIG. 7 is a flow diagram illustrating a method for adaptively reducing an encoder bit rate in accordance with an embodiment of the present invention. As shown in step 700, an average transmit queue latency value is first determined. Next, in step 702, this value is compared to a predetermined maximum tolerated delay threshold.
图7为根据本发明一个实施例的编码器比特率自适应减小方法的流程图。如步骤700所示，第一次确定平均传输队列等待时间值。接下来，在步骤702中，将该值与预定最大容许延迟阈值相比较。
FIG. 6 illustrates an embodiment of a method for adaptively adjusting an encoder bit rate based on average transmit queue latency in accordance with an embodiment of the present invention. The disclosed method is utilized during the transmission of a video stream having a relatively constant encoded bit rate (step 600). During transmission of such video streams, the MAC transmit queue depth/latency of the transmitting device will often increase in response to deteriorating channel capacity. Although the illustrated method operates on a single video stream, the method is similarly applicable to the transmission of multiple video streams to one or more receiving devices. In such embodiments, transmit queue depth may be tracked on a per stream basis and/or per device basis. Further, the method of FIG. 6 may be utilized separately and/or in combination with other adaptive encoding methods and systems, including the novel methods disclosed above.
图6显示了根据本发明一个实施例的基于平均传输队列等待时间的编码器比特率自适应调整方法的一个实施例。具有相对恒定编码比特率的视频流传输期间使用公开方法（步骤600）。这种视频流传输期间，传输装置的MAC传输队列长度/等待时间通常随着信道容量的降低而增加。所示方法对单个视频流进行操作，但本方法同样也适用于将多个视频流传输给一个或多个接收装置。在这些实施例中，传输队列长度可按视频流和/或按装置进行跟踪。进一步，图6所示的方法可单独使用，并/或与其他自适应编码方法和系统，包括上文所述的新型方法结合使用。
Encoder bit rate adjustment 304 in accordance with the illustrated embodiment may utilize one or more estimated throughput table(s) 306 generated by the channel throughput estimation 300 process. An exemplary estimated throughput table 306 (Table 1) is shown below. In this embodiment, estimated target throughput rates (Tr) are calculated for a variety of modulation and coding schemes (MCSs) supported by the wireless access device 106. Supported MCSs may comprise all or a subset of MCSs specified by a given communication standard (e.g., IEEE 802.1 In). The value of an estimated Tr corresponding to a particular MCS generally reflects an estimated upper limit for the throughput rate of the wireless channel 226, with a possible reduction(s) for desensitization purposes, and is generally less than the relevant associated maximum PHY values may be influenced by a number of throughput indicia 302, including but not limited to channel bandwidth, ACK policy, aggregation parameters, channel load (possibly including channel load measured by an associated BSS), etc.
根据所示实施例的编码器比特率调整器304可利用信道吞吐量估计300程序生成的一个或多个估计吞吐量表306。示例估计吞吐量表306（表1）如下所示。在该实施例中，为无线接入装置106支持的多种调制编码方案（MCS）计算估计目标吞吐率（Tr）。支持的MCS可包括指定通信标准（例如，IEEE 802.1 In）规定的所有或一部分MCS。与特定MCS对应的估计Tr的值一般反映了无线信道226的吞吐率的估计上限，为了减敏的目的，可能会降低，一般小于相关最大PHY率。Tr值可受到多个吞吐量指标302的影响，包括但不限于，信道带宽、ACK策略、聚合参数、信道负荷（可能包括相关BSS测量的信道负荷）等。
Adaptive video encoding based on predicted wireless channel conditions. Based on at least one of a number of transmitter side indications of the available throughput of a wireless channel for video delivery, an encoder rate adaptation mechanism generates an estimate of the supportable throughput of the wireless channel under different operating conditions. An encoding parameter, such as encoder bit rate, is subsequently altered based on the estimated throughput value. In one instance, transmitter side throughput indicia is used to generate target encoder bit rates for multiple potential PHY data rates/channel MCS selections that may be used in video delivery. In anticipation of or immediately following a transition to one such PHY data rate/MCS selection, the encoder bit rate is altered in accordance with an associated target bit another mode, average transmit queue latency information is used to further regulate the encoder bit rate.
基于无线信道预测状态的自适应视频编码。根据视频传输无线信道的可用吞吐量的多个发送侧指标的至少其中之一，编码器速率自适应机构生成不同工作条件下无线信道的可支持吞吐量的估值。随后根据估计吞吐量值改变编码参数，例如编码器比特率。在一个示例中，发送侧吞吐量指标用于生成可用于视频传输的多个潜在PHY数据率/信道MCS选择的目标编码器比特率。预计这种PHY数据率/MCS选择会发生转变，在转变之后，根据相关目标比特率改变编码器比特率。在另一个实施方式中，平均传输队列等待时间信息用于进一步调整编码器比特率。
Ga naar Premium voor toegang tot miljoenen vertaalvoorbeelden, onbeperkt woorden opslaan en leren, zonder advertenties.
Synoniemen voor encoder bit rate in het Engels
Woord & uitdrukking van de dag
Afbeelding van de dag
Suggesties
Resultaten: 19. Exact: 19. Verstreken tijd: 14 ms.
