Differences between the two signals:
ITU-R BT 601: 16-bit data transmission; 21-core; y, U, V signal simultaneous transmission.
ITU-R BT 656: 9-core, no need for synchronous signal; 8-bit data transmission; Serial video transmission; transmission rate is 2 times of 601; first pass y, then pass UV. 656 of the output data is serial data, and the synchronous signal of the line field is embedded in the data str
I have summarized the commonly used ITU speech codec for your reference:
1. g.711: pulse code modulation (PCM) of voice Frequencies
Encoding type: Expanded PCMEncoding rate: 64 Kbps
Theoretical latency: the time for processing a sample (1/8000 seconds = 0.125 milliseconds );
Sound Quality: Long Distance quality;Advantages: Low algorithm complexity, low compression ratio (CD sound quality> 400 Kbps), minimum codec latency (relative to other technologi
Introduction to ITU-R bt.601
In 1982, CCIR (International Radio Consultative Committee International Radio Advisory Committee) developed the color video digitization standard, known as the CCIR 601 standard, and is now changed to the ITU-R bt.601 standard (601-4: 1994.7. /601-5: 1995.10 ). This Standard specifies the sampling frequency used to convert a color video to a digital image, and the conve
http://zh.wikipedia.org/zh-cn/G.711
ITU-T G.711 page
ITU-T g.191 software tools for speech and audio coding, including g.711 C code
Code Project C # Implementation of g.711 with source code
G.711 is an audio coding method developed by the International Telecommunication Union (ITU-T), also known as the I
the y,u,v three dimensions.1.1.3YCbCrYCbCr is a color space defined by the ITU in standard ITU-R bt.601 (SD), ITU-R bt.709 (HD), ITU-R bt.2020 (Ultra HD), for use in Digital TV systems . YCbCr is not an absolute color space, is a coding for the RGB, is the YUV compression and offset version, where Y is consistent with
last one-byte XY indicates the location of the row in the entire data frame and how to distinguish Sav and EAV. The meanings of each XY byte bit are shown in figure 5.
In Figure 5, the highest bit7 value is fixed data 1; F = 0 indicates an even number of fields, F = 1 indicates an odd number of fields, and V = 0 indicates valid video data for this behavior, V = 1 indicates that the row does not have a valid video count.Data; h = 0 indicates sav signal, H = 1 indicates EAV signal
ITU-R601/656, formerly known as ccir601/656, is a video standard proposed by the International Telecommunications Association.
Glossary: bt.656: This ITU Recommendation defines a parallel interface (8-bit or 10-bit, 27 MHz) and a serial interface (270 Mbps) for the transmission of bt.601 YCbCr digital video between pro-video equipment.
Proposal No. 656-3 of the Radio Communication Department of the Internat
XY byte is shown in Figure 5.In Figure 5, the highest bit bit7 is a fixed data 1;f=0 representing an even number of fields, f=1 represents an odd field, v=0 indicates that the behavior is valid video data, v=1 indicates that the row does not have valid video data;H=0 is expressed as the SAV signal, H=1 is expressed as EAV signal, P3~P0 is a protection signal, generated by F, V, H signal calculation, P3=v XOR H;p2=f xor H;p1=f xor V;p0=f xor V xor or H.Analysis: The last 1 bytes of the XY value
. After the completion of these work, if there are any details of the problem, if you want to spend time, look at the specifications of the register can be solved, if you do not want to see, find the Module factory FAE, they are professional, will help you fix it soon.(7), the hardware interface of the cameraSecond, the hardware interface on the camera master chip on the s5pv3101, camif Camera InterfaceFirst look at the camera Interface Block diagram: (this looks a bit like, we put here, first u
The following information about the Joint Video Team (JVT) and its work may be helpful to some of you. [version:]
The primary work of the JVT currently consists:1) Scalable Video Coding (SVC) extension development, and(2) maintenance of the existing advanced video coding (AVC) Standard ITU-T rec. h. 264 ISO/IEC 14496-10, e.g ., including errata reporting and maintenance of reference sotware and conformance specifications.
The JVT currently has 3 act
compressed to a digital rate of 32 to 256kbit/s, and the voice can be as low as 8kbit/s.The purpose of compressing digital audio information is to minimize the amount of data in digital audio information without affecting people's use. This is usually measured in the following 6 properties:-Bit rate;-The bandwidth of the signal;-Subjective/objective voice quality;Delay-Computational complexity and memory requirements;-Sensitivity to channel error;In order to make the encoded audio information w
compression.Up to now, the audio signal has been compressed to a digital rate of 32 to 256kbit/s, and the voice can be as low as 8kbit/s.The purpose of compressing digital audio information is to minimize the amount of data in digital audio information without affecting people's use. This is usually measured in the following 6 properties:-Bit rate;-The bandwidth of the signal;-Subjective/objective voice quality;Delay-Computational complexity and memory requirements;-Sensitivity to channel error
Video conferencing Protocol
H.221-ITU-T protocol for communication frame structures in conferencing television systems. It mainly defines how audio, video, Data, control signaling, and so on are combined into frame transmission formats.
H.230-ITU-T protocol for Frame Synchronization Control and indication signals in conferencing television systems.
H.231-ITU-T
. hardware interface on camera master chip on s5pv310
1. camif camera interface
First, let's take a look at the camera interface diagram: (this looks a bit like a figure. Let's take a look at it here. In fact, this is generally not involved in the driver, but we analyzed it here and brought it out)
(1) main attributes of the camera interface:
A. Multiple Input interfaces are supported: (the four modes we see above)
DMA (Axi 64-bitinterface) mode;
Mipi (CSI) mode;
transmission, which is limited by the forwarding performance of each device during transmission. In addition, there are software restrictions, for example. days. chao.. min. sense. time consumed by the word filter program ...... ADSL is not symmetric, but asymmetry still has its provisions, the common standards are as follows: ITU-T G.992.1 (G. dmt) G. dmt: full speed, 8 Mbps downstream, up 1.5 Mbps ITU-T
1. Fixed architecture and mobile evolution to nomadic Network
At present, telecom operators, equipment manufacturers, and standards-making organizations at home and abroad are stepping up research on NGN technology. International standardization organizations have put the standardization of NGN technology on the agenda, there are four main camps: ITU-T, ETSI, 3GPP and IETF. ITU-T has made a clear definition
using mathematical functions. In addition, the non-uniformity and correlation of voice signals increase the probability of non-uniformity in the appearance of Small-range signals, correlation is manifested in the correlation between two adjacent sample points and the two sample points between different pitch periods. In linear prediction, relevance is used to calculate the signals that appear from the original voice signal. In addition, a person spends 50% of his/her time in a normal conversati
, and more filters are needed.
The lower the QP, the smaller the quantization degree, the less block effect will be generated, and the weaker the filter will be used to prevent the boundary from becoming blurred.
Two filters are available based on the filter strength (BS ).
1 ≤ BS ≤ 3, basic filtering operation
BS = 4, strong filtering operation
Boundary filter computing
Truncation parameter C
BS = 4
More Obvious Block Effect
More severe filtering
labels in SDH frame structure
ITU-T-related recommendations define a C2 byte in SDH's high-order channel overhead to indicate the signal type for virtual container VC-3/VC-4/VC-4-XC loading. According to ITU-T recommendations, C2 bytes of 8 bits of different encoding correspond to different signal types, such as TUG structure, PDH34M or 45 M, PDH140M, ATM, MANDQDB) and FDDI. Initially, the
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