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1、DRAFT FOR DEVELOPMENT DD IEC/TS 62312-1-1:2008 Guideline for synchronization of audio and video Part 1-1: Measurement methods for synchronization of audio and video equipment and systems General ICS 33.160.01 ? Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Unc
2、ontrolled Copy, (c) BSI DD IEC/TS 62312-1-1:2008 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 September 2008 BSI 2008 ISBN 978 0 580 62713 2 National foreword This Draft for Development is the UK implementation of IEC/TS 62312-1-1:
3、2008. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be obtained.
4、Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publication will be initiated not later than three years after its publicati
5、on by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replies received by the end of the review period, the responsible BSI Comm
6、ittee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4
7、AL. The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessa
8、ry provisions of a contract. Users are responsible for its correct application. Amendments/corrigenda issued since publication DateComments Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI IEC/TS 62312-1-1 Edition 1.0 2008-03 TECHNICAL
9、SPECIFICATION Guideline for synchronization of audio and video Part 1-1: Measurement methods for synchronization of audio and video equipment and systems General DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI
10、CONTENTS INTRODUCTION.3 1 Scope.4 2 Normative references .4 3 Terms and definitions .4 4 Measuring conditions4 4.1 General conditions 4 4.1.1 Power supplies4 4.1.2 Environmental conditions.5 4.2 Specific conditions 5 4.3 General settings5 4.4 Specific settings5 5 Measurement methods .6 5.1 General b
11、lock diagram 6 5.2 Test signal source and test signal .6 5.2.1 General .6 5.2.2 Signal generator6 5.2.3 Test disc6 5.3 EUT.7 5.3.1 Equipment .7 5.3.2 Compound equipment8 5.4 Measuring instruments 9 5.4.1 General .9 5.4.2 Measurement of signal 9 5.4.3 Measurement of reproduced signal9 5.4.4 Specific
12、requirement10 Annex A (informative) Assessment of the result of measurement .11 Bibliography12 Figure 1 General block diagram for measurement6 Figure 2 Audio and video device 7 Figure 3 Source device 8 Figure 4 Display device8 Figure 5 Recorder device.8 Figure 6 Compound equipment 9 Figure 7 Measure
13、ment of reproduced signal 10 2 DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI INTRODUCTION Audio and video equipment processes or reproduces the input signals of audio and video, then outputs these signals in
14、various forms. Audio and video equipment needs time to process or reproduce the input signal. This time depends on the signal format, the architecture of equipment and the design of equipment. Hence audio and video equipment may have different output delays for audio and video signals, and this caus
15、es unsynchronised audio and video outputs. This Technical Specification is the general part of the measurement method for that time difference between audio and video outputs. The other subparts of IEC/TS 62312-1 describe specific measurement methods for specific audio and video equipment. 3 DD IEC/
16、TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI GUIDELINE FOR SYNCHRONIZATION OF AUDIO AND VIDEO Part 1-1: Measurement methods for synchronization of audio and video equipment and systems General 1 Scope This part of
17、62312 gives guidelines for methods of synchronization of audio and video. This Technical Specification describes general measurement methods for the synchronization of audio and video equipment. 2 Normative references The following referenced documents are indispensable for the application of this d
18、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC/TS 62312-2, Guideline for synchronization of audio and video Part 2: Methods for synchronization of audio and video systems 3 T
19、erms and definitions For the purposes of this document, the following terms and definitions apply. Also the terms and definitions given in IEC 62312-2 apply. 3.1 EUT equipment under test 4 Measuring conditions 4.1 General conditions 4.1.1 Power supplies 4.1.1.1 Voltage The supplied AC power voltage
20、shall be the fixed value of the region where the equipment under test is used. The supplied DC power voltage shall be the fixed value specified by the manufacturer. The tolerance shall be within 1 % in both cases. If this tolerance does not affect the results of measurement, the tolerance can be wit
21、hin 5 %. 4.1.1.2 Frequency The frequency of the AC power supply shall be 50 Hz or 60 Hz and the fluctuation shall be within 2 %. 4 DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI 4.1.1.3 Waveform distortion 4.1
22、.1.3.1 AC power supply The waveform of the AC power supply shall be a sine wave in which the harmonic content is 2 % or less. 4.1.1.3.2 DC power supply The ripple voltage shall be 0,1 % or less. 4.1.2 Environmental conditions 4.1.2.1 Environmental air condition The environmental conditions for measu
23、rements shall be: Ambient temperature: Relative humidity: Air pressure: 20 C + 15 C 5 C 60 % 15 % 96 kPa 10 kPa 4.1.2.2 Warm up The equipment under test shall be powered on 5 min before starting the test. It may be zero if the warm up does not affect the results of measurement. 4.1.2.3 Initializatio
24、n The equipment under test shall be initialized before starting the test. 4.2 Specific conditions If specific conditions are required for the measurement of equipment, these conditions shall be specified. NOTE The other subparts of IEC 62312-1 specify the measurement method for the specific equipmen
25、t, the special conditions may be specified in that part. 4.3 General settings General settings for equipment shall be set to the default setting which is specified by the manufacturer, normally centre position. If there will be no special indication and the functions that affect the results of measu
26、rement, all of the controllers shall be switched off. 4.4 Specific settings If specific equipment has its own specific settings, it shall be set to have the results of measurement regarding the specific settings. The other subparts of IEC 62312-1 specify specific settings for specific equipment. 5 D
27、D IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI 5 Measurement methods 5.1 General block diagram Test signal source EUT Measuring instruments Audio Video Inputs Outputs Audio Video IEC 346/08 Figure 1 General blo
28、ck diagram for measurement The test signal source provides the reference audio and video signal. There is either no time difference between them or the difference is specified. These audio and video test signals are applied to EUT in appropriate method for each EUT. The EUT reproduces or processes t
29、hese test signals and outputs the audio and video signals. The measuring instruments measure the output from the EUT and measure the time difference between audio and video outputs from the EUT. 5.2 Test signal source and test signal 5.2.1 General The test signal source provides audio and video test
30、 signals as a reference signal for measuring. The content, format and media of the test signal are different depending on the EUT. The basic format of the test signal content consists of synchronized audio and video signals that are used as a reference for synchronization and are processed or reprod
31、uced by EUT. The EUT outputs the resulting signal to the measuring instruments. The output signal should be detectable and be able to be measured by the measuring instruments. To conform to this requirement, the test signal content should be made suitable for the measuring instruments. The form of t
32、he test signal is an electrical signal or a signal recorded on media. The format and media of the test signal should be appropriate for EUT. This would normally be the default format and media appropriate to the functionality of EUT. 5.2.2 Signal generator Where a signal generator is applied to an E
33、UT that has a signal input, the format of output signal of the signal generator should be appropriate for EUT. The signal will be input through an appropriate signal interface on the EUT. 5.2.3 Test disc Where a test disc is applied to EUT that is a disc player, the test disc format should be approp
34、riate for EUT. 6 DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI 5.3 EUT 5.3.1 Equipment 5.3.1.1 General In this Technical Specification, the EUT is an audio and video device that consists of audio and video un
35、its. Each unit includes latency and delay. The model of audio and video device is defined in IEC 62312-2. Figure 2 shows a simplified model of an audio and video device based on the definition of IEC 62312-2. Audio and video device Audio Video t1 + TLv + TDv t1 + TLa + TDa TLv + TDv TLa + TDa Inputs
36、 Outputs t1 Audio Video IEC 347/08 The total latency and the delay of the audio and video device are defined. Key TLv is the total latency of video TDv is the total delay of video TLa is the total latency of audio Tda is the total delay of audio Figure 2 Audio and video device Latency and delay are
37、defined in Clause 3 of IEC 62312-2. The audio and video device reproduces or processes the input signal, and this causes delay and latency. From the input to the output, the total delay and the total latency are caused in each of audio and video signals. The audio and video signals are input to the
38、audio and video device at the time t1, the total latency and delay are added to this to form the audio and video output signals. The outputs from the source device are audio and video signals in analogue or digital form. 5.3.1.2 Category of audio and video device 5.3.1.2.1 Source device Audio and vi
39、deo devices are categorized into specific types of devices. Figure 3 shows the source device and the signal source which is the input to the source device. The signal source can be in various forms. In case of disc player, disc is a signal source. In case of tuner, received and decoded broadcasting
40、signal is a signal source. 7 DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI Source device Audio Video Signal source Outputs Audio Video TLa + TDa TLv + TDv t1 + TLv + TDv t1 + TLa + TDa t1 IEC 348/08 Figure 3
41、Source device 5.3.1.2.2 Display device Figure 4 shows the display device. The outputs from this device are audio and video signals reproduced as sound and visual images realized by a display unit and speakers. Display device Audio Video Speakers Display unit Video driver Audio driver Inputs TLv + TD
42、v TLa + TDa t1 t1 + TLv + TDv t1 + TLa + TDa IEC 349/08 Figure 4 Display device 5.3.1.2.3 Recorder device Figure 5 shows the recorder device, the audio and video signals are recorded on the storage and these signals are played and then output. The total delay and latency are the sums of each of the
43、total delay and latency of the recording part and the playback part, as identified by suffix R for the recording part and P for the playback part. In order to measure the recording part delay, the monitor outputs are used. Recorder device Storage Outputs (TLv + TDv)P (TLa + TDa)P (TLv + TDv)R (TLa +
44、 TDa)R Audio Video Inputs t1 + TLv + TDv t1 + TLa + TDa t1 Recording part Playback part Monitor outputs Audio Video IEC 350/08 Figure 5 Recorder device 5.3.2 Compound equipment Equipment may consist of multiple audio and video devices. Generally the EUT is defined as the device between the first inp
45、ut and the final output. When it is required to measure the EUT from the second or later input to before the final output, those inputs and outputs should be 8 DD IEC/TS 62312-1-1:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 12:06, Uncontrolled Copy, (c) BSI th
46、e subject of measurement. Figure 6 shows compound equipment that consists of multiple (n devices) audio and video devices. For instance, equipment such as a TV with a video recorder consists of TV tuner as a source device, recorder device and display device. First outputs Audio Video First inputs t1
47、 + (TLv + TDv)1 t1 + (TLa + TDa)1 t1 nth input Audio and video device 1 (TLv + TDv)1 (TLa + TDa)1 Audio and video device n (TLv + TDv)n (TLa + TDa)n Final outputs t1 + (TLv + TDv)1 + + (TLv + TDv)n t1 + (TLa + TDa)1 + + (TLa + TDa)n n = 1, 2, 3, . Audio Video Audio Video Audio Video IEC 351/08 Figur
48、e 6 Compound equipment 5.4 Measuring instruments 5.4.1 General The audio and video device outputs audio and video signals with the total values of latency and delay as shown in Figure 2. The measuring instruments should have a capability to measure the timing of the output signal, that is a processe
49、d or reproduced signal of the input signal. The measuring instruments measure the value of the difference between them, or, a calculation gives the difference, the value is: Td = (t1 + (TLv + TDv) (t1 + (TLa + TDa) = (TLv + TDv) (TLa + TDa) where Td is a time value that indicates the total latency and delay of the video against the audio. 5.4.2 Measurement of signal The forms of output signals are analogue or digital