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| Book Subscribers > Format Verification News |
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Verification News (No 13) Mar. 2001 TO: All NDA Contractors of DVD Specifications
March 2001 We are pleased to provide you with DVD Format Verification News No.13. Two new Class-A Laboratories have been established, for expanding the DVD format verification activities. One is PDSC Lab in California, USA; the other is Mitsubishi Lab in Kyoto, Japan. They introduce themselves in the followings. Please make much effort to have your products compliant with DVD Specifications. We, all of 13 Class-A Laboratories will continue to provide necessary tools and services for verification. Sincerely, Class-A Verification Laboratories:
Tokyo (Hitachi) Laboratory
Asia (ITRI) Laboratory
Tokyo (JVC) Laboratory
Korea (LGE) Laboratory
Osaka (Matsushita) Laboratory
Kyoto (Mitsubishi) Laboratory
California (PDSC) Laboratory
Europe (Philips) Laboratory
Tokyo (Pioneer) Laboratory
Korea (SAMSUNG) Laboratory
Tokyo (Sony) Laboratory
North America (WAMO) Laboratory
Tokyo (Toshiba) Laboratory
Table of Contents: 1. Introduction of PDSC Verification Lab Panasonic Disc Services Corporation (PDSC) located in Torrance, California has been approved by the DVD Forum as a Class-A Verification Laboratory as of Feb 21st 2001. PDSC started production with its first facility located in Torrance in fall of 1997. By fall of 2000, we have expanded our operations with a total of 4 global facilities capable of producing DVD's at an output of about 10 million discs per month. Due to the seasonality of studio business, it was also necessary to maintain reliable and quality outsource replicators. Since 4 years ago, PDSC engineering has been continuously evaluating, qualifying, and monitoring other replicators, and when necessary providing technical support through electrical and mechanical evaluations in order to meet PDSC standard. Having such manufacturing expertise as well as technical knowledge allowed PDSC to provide technical information for process and quality improvements. This was the open communication given to our outsource replicators which we will offer as a "Value Added" service at PDSC. In 1997, the number of DVD titles released domestically was only about 500, but last year there were a total of about 3,700 new titles released bringing the current total to over 8,000 titles. For domestic set top players, in 1997 about 300,000 units were sold and last year that number jumped to over 7 Million units, bringing the running total to over 12 Million for the past 4 years. This shows the acceptance of the format and the importance in ensuring discs and players are made to the DVD specification. DVD is quickly becoming a standard household product. It was clear for us that additional Class-A Verification Labs were needed in the North American region, particularly in the West Coast. The growth of this format, particularly in this region, needs to be supported through local labs. We made use of our experience to expand and develop additional service of Class-A Verification Lab. Through this lab, we strive to promote and support the DVD format by providing 2-way open communication. This in turn will support licensees adhering to the DVD specification, which achieves format acceptance. Verification services provided at PDSC are:
Equipment
List
Contact Information:
Names: Terry Kishi Ivo Rijadi 2. Introduction of Mitsubishi Verification Lab (Kyoto, JAPAN) DVD Verification laboratory of Mitsubishi Electric Corporation was approved as a Class-A Laboratory by the Steering Committee held on February 21st, 2001 at L.A. in the U.S.A. and started its operation of the verification service in "DVD Video Player" from the end of February 2001. As the DVD industries are grown up, better conformance of DVD products to the DVD specifications is required in order to avoid compatibility problems. We believe that Mitsubishi Electric's development in the optical disk field during more than 20 years is able to show some solutions in the DVD verification area. Mitsubishi Electric has been working on the DVD format making since 1995. Our contribution to the format making commenced on the DVD-ROM and -Video area and our recent activities have resulted in establishing the Specifications for DVD-RAM, -R, RW, Video Recording, and -Audio. As well, we have served the DVD forum as a member of the Steering Committee, and actively participated in the Technical Coordination Group and all the Technical Working Groups. Through the verification activity that is newly added to our experience and knowledge, Mitsubishi Electric is going to contribute much more to the sound growth of the DVD market. Future service expansion is being considered at present.
Service Category : DVD Video Player
3. Recommendation for DVD-RAM Disc Manufacturers Write power control parameters to be pre-recorded in the disc manufacturing information of the control data zone (1) Background The "Technical Information (TI)" defines several parameters for determination of recording power and adaptive write control table. TCG has approved to put those parameters into the physical format information of the control data zone so that drives can use them for write power calibration. But the DVD-RAM drives, which were shipped before Supplemental Information for the DVD-RAM (4.7GB) Book Part 1 is published, can not use those parameters. Therefore, disc manufactures should be recommended to write the following information into the disc manufacturing information of the control data zone. (2) Write power control parameters in the disc manufacturing information (BP0) PP2L/Pp2thL: Ratio of Peak power for land tracks to threshold peak power for land tracks. This byte is the same as BP615 in the physical format information of the control data zone. (BP1) AS6T: Target asymmetry This byte is the same as BP616 in the physical format information of the control data zone. (BP2) PP1: Temporary peak power This byte is the same as BP617 in the physical format information of the control data zone. (BP3) PB11: Temporary bias power1 This byte is the same as BP618 in the physical format information of the control data zone. (BP4) PB21: Temporary bias power2 This byte is the same as BP619 in the physical format information of the control data zone. (BP5) PB31: Temporary bias power3 This byte is the same as BP620 in the physical format information of the control data zone. (BP6) PP2G/PPthG: Ratio of Peak power for groove tracks to threshold peak power for groove tracks. This byte is the same as BP621 in the physical format information of the control data zone. (BP7) PP1/PPth6TL: Ratio of Temporary peak power to threshold 6T peak power for land tracks. This byte shall specify the ratio of the Temporary peak power to the threshold 6T peak power for land tracks. The threshold 6T peak power is defined as the peak power when the jitter value of 6T pattern becomes 13% with the Bias power1, 2, 3 and the write pulse set to the values given in BP504 to 506, BP502 and BP511 to BP548 of the physical format information.
b7 to b0 : 1000 0010b : 1.30 (example)
PP2L/PPth6TL = (PP1/PPth6TL)×PP2L/PP1
= BP7×BP503/BP2 (BP8) PP2G/PPth6TG: Ratio of Peak power for groove tracks to threshold 6T peak power for groove tracks. This byte is the same as BP623 in the physical format information of the control data zone. (BP9 to 2047) Text or code data written in this field by the disc manufacturer shall be ignored for the write power control. Reference : Supplemental Information for the DVD-RAM(4.7GB) Book Part 1 Following is the supplemental information for write power control parameters to be recorded in the control data. 5.7.1.5.1 Physical format information
(BP 613 to
(BP 624 to 2047) reserved All bytes shall be set to 00h. Annex AA (Normative) : Write power control parameters The use of write power control parameters is optional. If a disc manufacturer does not use this field, then this field shall be filled with 00h. If a disc manufacturer uses this field, then the contents of this field shall be as shown below. The values specified for the write power control parameters given in BP615 to BP623 are only for example, their actual values shall be decided by the disc manufacturer. These write power control parameters can be used for write power calibration by a drive, refer to Annex BB. (BP613 to 614) Identifier This field shall be set to 0101h. (BP615) Ratio of Peak power for land tracks to threshold peak power for land tracks This byte shall specify the ratio of the Peak power for land tracks to the threshold peak power for land tracks. The threshold peak power is defined as the peak power when the jitter value of random data becomes 13% with the Bias power1, 2, 3 and the write pulse set to the values given in BP504 to 506, BP502 and BP511 to BP548 of the physical format information.
b7 to b0 : 1000 0010b : 1.30 (example) (BP616) Target asymmetry This byte shall specify the value of the asymmetry of 6T signal recorded on land tracks with the Peak power, Bias power1, 2, 3 and the write pulse set to the values given in BP617 to BP620, BP502 and BP511 to BP548 of the physical format information.
b7 : sign
b6 to b0 : 000 0000b : 0 % (example) (BP617) Temporary peak power This byte shall specify the temporary peak power on the read-out surface of the disc for determining the adaptive write control tables.
b7 to b0 : 0111 0011b : 11.5mW (example) (BP618) Temporary bias power1 This byte shall specify the temporary bias power1 on the read-out surface of the disc for determining the adaptive write control tables.
b7 to b0 : 0010 1101b : 4.5mW (example) (BP619) Temporary bias power2
This byte shall specify the temporary bias power2 on the read-out
surface of the disc for determining the adaptive write control
tables. (BP620) Temporary bias power3 This byte shall specify the temporary bias power3 on the read-out surface of the disc for determining the adaptive write control tables.
b7 to b0 : 0010 1101b : 4.5mW (example) (BP621) Ratio of Peak power for groove tracks to threshold peak power for groove tracks This byte shall specify the ratio of the Peak power for groove tracks to the threshold peak power for groove tracks. The threshold peak power is defined as the peak power when the jitter value of random data becomes 13% with the Bias power1, 2, 3 and the write pulse set to the values given in BP508 to 510, BP502 and BP511 to BP548 of the physical format information.
b7 to b0 : 1000 0010b : 1.30 (example) (BP622) Ratio of Peak power for land tracks to threshold 6T peak power for land tracks This byte shall specify the ratio of the Peak power for land tracks to the threshold 6T peak power for land tracks. The threshold 6T peak power is defined as the peak power when the jitter value of 6T pattern becomes 13% with the Bias power1, 2, 3 and the write pulse set to the values given in BP504 to 506, BP502 and BP511 to BP548 of the physical format information.
b7 to b0 : 1000 0010b : 1.30 (example) (BP623) Ratio of Peak power for groove tracks to threshold 6T peak power for groove tracks This byte shall specify the ratio of the Peak power for groove tracks to the threshold 6T peak power for groove tracks. The threshold 6T peak power is defined as the peak power when the jitter value of 6T pattern becomes 13% with the Bias power1, 2, 3 and the write pulse set to the values given in BP508 to 510, BP502 and BP511 to BP548 of the physical format information.
b7 to b0 : 1000 0010b : 1.30 (example)
Annex BB (Informative) : Guideline for the Power calibration procedure This annex provides procedures for the power calibration by a drive. BB.1 Procedure A BB.1.1 Determination of Bias Power 1, 2 and 3 for the adaptive write control tables calibration (1) Set Peak power to the value given in BP617 of the physical format information. Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) After overwriting reciprocal pattern of 3T mark and 3T space successively for ten times on a land track, overwrite reciprocal pattern of 11T mark and 11T space for a time on the land track. This 11T overwriting on 3T ten times overwriting should be carried out at each Bias power1, 2 and 3. Measure jitter value of reciprocal pattern of 11T mark and 11T space by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 should be from smaller value to larger value. The ratio between Bias power1, 2 and 3 should be equal to the ratio between PB10, PB20, and PB30, given in BP504, BP505 and BP506 of the physical format information respectively. (3) After overwriting reciprocal pattern of 11T mark and 11T space successively for ten times on a land track, overwrite reciprocal pattern of 3T mark and 3T space for a time on the land track. This 3T overwriting on 11T ten times overwriting should be carried out at each Bias power1, 2 and 3. Measure jitter value of reciprocal pattern of 3T mark and 3T space by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 should be from smaller value to larger value. The ratio between Bias power1, 2 and 3 should be equal to the ratio between PB10, PB20, and PB30, given in BP504, BP505 and BP506 of the physical format information respectively. (4) Plot two jitter curves of procedure (2) and (3), as shown in [Figure BB.1.1-1]. (5) Measure the lower Bias power1 PB11btm, which is the lower Bias power1 when the jitter becomes 13 % within the overlap of the two jitter curves. Measure the higher Bias power1 PB11top, which is the higher Bias power1 when the jitter becomes 13 % within the overlap of the two jitter curves. (6) Bias power1 (PB11), Bias power2 (PB21) and Bias power3 (PB31) for the adaptive write control tables calibration should be determined as follows.
PB11 = (PB11btm /
PB11top) / 2 Figure BB.1.1-1 : Determination of Bias power 1 (PB11)
BB.1.2 Determination of Peak Power for the adaptive write control tables calibration (1) Set Bias power1, 2 and 3 to PB11, PB21 and PB31 respectively. Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) Overwrite reciprocal pattern of 6T mark and 6T space successively for ten times on a land track. This 6T ten times overwrite should be carried out at each Peak power. Measure peak level (a), bottom level (b) and slice level (g) of a duty feed back slicer at each Peak power, as shown in [Figure Z.1-2]. The change in Peak power should be from smaller value to larger value. (3) Calculate 6T asymmetry value (AS6T) as follows.
AS6T
[%] = {(a+b-2g) / 2(a-b)} ´
100 [%] Figure BB.1.2-1 : Playback signal on Read channel1 after equalizer
BB.1.3 Determination of the calibrated adaptive write control tables (AWCTcal) (1) Set Peak power to PP1. Set Bias power1, 2 and 3 to PB11, PB21 and PB31 respectively. Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) Calibrate TSFP values and TELP values except TSFP(M6, LS6) and TELP(M6, TS6). This calibrated adaptive write control table is called AWCTcal. BB.1.4 Determination of calibrated Bias Power 1, 2 and 3 on Land track (PB12L(cal), PB22L(cal) and PB32L(cal)) (1) Set Peak power to PP1. Set the write pulse to the values given in AWCTcal. (2) Overwrite random data pattern successively for ten times on a land track at each Bias power1, 2 and 3. Measure jitter values of random data pattern by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 shall be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.1.4-1]. (4) Measure the lower Bias power1 PB12btmL and the higher Bias power1 PB12topL, that are the lower and the higher Bias power1 when the jitter value becomes 13 %, respectively. (5) Calibrated Bias power1 on Land track PB12L(cal), calibrated Bias power2 on Land track PB22L(cal) and calibrated Bias power3 on Land track PB32L(cal) should be determined as follows.
PB12L(cal) = (PB12btmL
/ PB12topL) / 2 Figure BB.1.4-1 : Determination of calibrated Bias power1 on Land track (PB12L(cal))
BB.1.5 Determination of calibrated Peak Power on Land track (PP2L(cal)) (1) Set Bias power1,2 and 3 to PB12L(cal), PB22L(cal) and PB32L(cal) Set the write pulse to the values given in AWCTcal. (2) Overwrite random data pattern successively for ten times on a track at each Peak power. Measure jitter values of random data pattern by changing Peak power. The change in Peak power shall be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.1.5-1]. (4) Measure the Peak power PP2thL when the jitter value firstly becomes 13 % with the increase of the Peak power. (5) Calibrated Peak power on Land track PP2L(cal) should be determined as follows.
PP2L(cal) = KL x PP2thL Figure BB.1.5-1 : Determination of calibrated Peak Power on Land track (PP2L(cal))
BB.1.6 Determination of calibrated Bias Power 1, 2 and 3 on Groove track (PB12G(cal), PB22G(cal) and PB32G(cal)) (1) Set Peak power to PP1. Set the write pulse to the values given in AWCTcal. (2) Overwrite random data pattern successively for ten times on a groove track at each Bias power1, 2 and 3. Measure jitter values of random data pattern by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 should be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.1.6-1]. (4) Measure the lower Bias power1 PB12btmG and the higher Bias power1 PB12topG, that are the lower and the higher Bias power1 when the jitter value becomes 13 %, respectively. (5) Calibrated Bias power1 on groove track PB12G(cal), calibrated Bias power2 on groove track PB22L(cal) and calibrated Bias power3 on groove track PB32G(cal) should be determined as follows.
PB12G(cal) = (PB12btmG
/ PB12topG) / 2 Figure BB.1.6-1 : Determination of calibrated Bias power 1 on Groove track (PB12G(cal))
BB.1.7 Determination of calibrated Peak Power on Groove track (PP2G(cal)) (1) Set Bias power1,2 and 3 to PB12G(cal), PB22G(cal) and PB32G(cal) Set the write pulse to the values given in AWCTcal. (2) Overwrite random data pattern successively for ten times on a groove track at each Peak power. Measure jitter values of random data pattern by changing Peak power. The change in Peak power should be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.1.7-1]. (4) Measure the Peak power PP2thG when the jitter value firstly becomes 13 % with the increase of the Peak power. (5) Calibrated Peak power on groove track PP2G(cal) should be determined as follows.
PP2G(cal) = KG x PP2thG Figure BB.1.7-1 Determination of operational Peak Power on Groove track (PP2G(cal))
BB.2 Procedure B BB.2.1 Determination of calibrated Bias Power 1, 2 and 3 on Land track (PB12L(cal) , PB22L(cal) and PB32L(cal)) (1) Set Peak power to the value given in BP503 of the physical format information.. Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) Overwrite random data pattern successively for ten times on a land track at each Bias power1, 2 and 3. Measure jitter values of random data pattern by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 shall be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.2.1-1]. (4) Measure the lower Bias power1 PB12btmL and the higher Bias power1 PB12topL, that are the lower and the higher Bias power1 when the jitter value becomes 13 %, respectively. (5) Calibrated Bias power1 on Land track PB12L(cal), calibrated Bias power2 on Land track PB22L(cal) and calibrated Bias power3 on Land track PB32L(cal) should be determined as follows.
PB12L(cal) = (PB12btmL
/ PB12topL) / 2 Figure BB.2.1-1 : Determination of calibrated Bias power1 on Land track (PB12L(cal))
BB.2.2 Determination of calibrated Peak Power on Land track (PP2L(cal)) (1) Set Bias power1,2 and 3 to PB12L(cal), PB22L(cal) and PB32L(cal) Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) Overwrite reciprocal pattern of 6T mark and 6T space successively for ten times on a land track at each Peak power. Measure jitter values of this 6T pattern by changing Peak power. The change in Peak power shall be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.2.2-1]. (4) Measure the Peak power PP2th6TL when the jitter value firstly becomes 13 % with the increase of the Peak power. (5) Calibrated Peak power on Land track PP2L(cal) should be determined as follows.
PP2L(cal) = KL 6T x PP2th6TL Figure BB.2.2-1 : Determination of calibrated Peak Power on Land track (PP2L(cal))
BB.2.3 Determination of calibrated Bias Power 1, 2 and 3 on Groove track (PB12G(cal), PB22G(cal) and PB32G(cal)) (1) Set Peak power to the value given in BP507 of the physical format information.. Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information. (2) Overwrite random data pattern successively for ten times on a groove track at each Bias power1, 2 and 3. Measure jitter values of random data pattern by changing Bias power1, 2 and 3. The change in Bias power1, 2 and 3 should be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.2.3-1]. (4) Measure the lower Bias power1 PB12btmG and the higher Bias power1 PB12topG, that are the lower and the higher Bias power1 when the jitter value becomes 13 %, respectively. (5) Calibrated Bias power1 on groove track PB12G(cal), calibrated Bias power2 on groove track PB22L(cal) and calibrated Bias power3 on groove track PB32G(cal) should be determined as follows.
PB12G(cal) = (PB12btmG
/ PB12topG) / 2 Figure BB.2.3-1 : Determination of calibrated Bias power 1 on Groove track (PB12G(cal))
BB.2.4 Determination of calibrated Peak Power on Groove track (PP2G(cal)) (1) Set Bias power1,2 and 3 to PB11G(cal), PB22G(cal) and PB32G(cal) Set the write pulse to the values given in BP502 and BP511 to BP548 of the physical format information.. (2) Overwrite reciprocal pattern of 6T mark and 6T space successively for ten times on a groove track at each Peak power. Measure jitter values of this 6T pattern by changing Peak power. The change in Peak power should be from smaller value to larger value. (3) Plot jitter curve of procedure (2), as shown in [Figure BB.2.4-1]. (4) Measure the Peak power PP2th6TG when the jitter value firstly becomes 13 % with the increase of the Peak power. (5) Calibrated Peak power on groove track PP2G(cal) should be determined as follows.
PP2G(cal) = KG6T x PP2th6TG Figure BB.2.4-1 : Determination of calibrated Peak Power on Groove track (PP2G(cal))
5. Single Layer Signal Disc (Calibration Disc) (1)Introduction: The DVD Forum announced that it will soon begin to deliver march 2001 calibration discs to DVD Format and Logo Licensees, who are DVD-ROM Disc replicators and/or DVD-ROM Disc evaluation system manufacturers, to further assure disc quality control and thus compatibility among DVD products. Calibration discs, an important tool needed in the DVD manufacturing process, can be used as a certified reference for the calibration of DVD measurement equipment, to assure conformity to industry standards. The first calibration disc to be offered, developed by Philips and Warner Advanced Media Operations (WAMO) in close cooperation with the DVD Forum's Verification Policy Committee and the DVD Format/Logo License Corporation, is a "Single Layer Signal Disc" for read-only DVD discs (DVD-Video, DVD-ROM and DVD-Audio). Each numbered calibration disc will be accompanied by an individual measurement report by the Philips DVD Format Verification Laboratory. This data will be calibrated against the reference, which is based on International Standards and/or agreed upon in the DVD Forum. (2)Measurement method: Together with the reference values SG1 has defined the details of the measurement methods related to the parameters provided. These measuement method is briefly described in this document and provided with each of the calibration discs. SG1 and WG2 have decided that the details of the measurement method will be described in the document: "DVD Read-Only Physical Test Specification " which is already mentioned in the DVD-Video disc test specification and the DVD-Audio test specification. (3)Delivery method: The FLLC will send to all DVD Format and Logo Licensees, who are DVD-ROM Disc replicators and/or DVD-ROM Disc evaluation system manufacturers a voucher for a free "Single Layer Signal Disc". The voucher is to be submitted to the measurement equipment supplier of your choice. Upon receipt of the voucher, Philips will deliver to you through the measurement equipment supplier of your choice, free of charge, one piece of this disc. This disc, individually measured and certified by Philips, provides you with a direct link to a certified reference for calibration of your DVD measurement equipment. As of March 13, 2001 the following measurement equipment suppliers have confirmed their participation with this program.
As each of the discs is individually measured with care, the capacity of Philips is limited. So please understand that it will take several month before all discs are delivered. Annex. Description of the Single Layer Signal Disc Optical Parameters. Refractive index [2.5.4] The manufacturer of the disc has supplied the Refractive Index (RI). The Refractive index of the Polycarbonate and space layer [2.5.4] for these calibration discs:
This is the RI of the initial batch. If the specific batch has different RI values this will be indicated in the individual measurement report. Substrate thickness [2.5.1] The substrate thickness of this disc is measured via the Interferometer method in accordance with the DVD specifications [Annex A.2] using the refractive index indicated by the disc manufacturer. The provided thickness is calculated (Upper Limit + Lower Limit) / 2. The Upper and Lower limit can be recalculated using the ± value. The values are measured over the area R=24 up to 56 mm. Reflectivity [2.5.7] The Reflectivity is measured in accordance with the DVD specifications [Annex D.2] using a high reflective (approx 75% Aluminum (AlTi)) or a low reflective (approx 22%, Silicon (Si(H)) calibration (mirror) discs (depending on the reflectivity level). These calibration discs are calibrated in accordance with the DVD specifications [Annex D.1] Individual measurements are provided for a selected number of bands. Note: For more accurate reflectivity calibration glass discs (with mirror) are available. Operational signals. High Frequency (HF) signal [2.7.1] The measurement conditions for the operational signals are in accordance with the DVD specifications [Annex H]. Focus gain, Tracking gain and Equalizer gain is set in accordance with the DVD specification conditions. Tangential tilt adjustment is done using a reference disc. So the Tangential tilt, Focus gain, Tracking gain and Equalizer gain are fixed for all discs and radii to be measured. Individual measurements are provided for a selected number of bands allowing multipoint calibration. Jitter [2.7.1.a] The parameters radial tilt, focus -, tracking - and slicing offsets are optimized for each measurement. Modulated amplitude [2.7.1.b] Individual measurements are provided for a selected number of bands allowing multipoint calibration of:
All measurement conditions are identical to the Jitter condition. Signal levels measured are averaged over 10 events Signal Asymmetry [2.7.1 c] Individual measurements are provided for a selected number of bands allowing multipoint calibration All measurement conditions are identical to the Jitter condition. Signal levels measured and averaged over 10 events Track Crossing Signal [2.7.1.d] Individual measurements are provided for a selected number of bands allowing multipoint calibration The Track Cross Signal is measured in accordance with the DVD specifications [figure 2.7.1-2] Servo signal DPD Amplitude [2.7.2.a]
All measurement conditions are identical to the Jitter condition. The DPD tracking error signal may look like the figure shown above. The tracking error signal at 0.1 µm track off-set is calculated by:
in which Notes:
The DPD amplitude is then calculated by:
where The DPD Amplitude value of this signal disc allows to determine a correction factor K to compensate for the above mentioned deviations of n and Vpc, and possibly other circuit parameters and adjustments of the measuring equipment used.
See also [Annex I.2]. Measuring conditions Room Temperature 23°C ± 2°C Relative Humidity 30% to 70% Indications of the measurement values. The below mentioned values are an average value of the measurements carried out on the first batch of this Single Layer Signal Disc. Measurement data from different batches will differ and measurement values of individual discs in one batch are not identical. Therefore the "measured value" mentioned below are an indication only.
If the disc is provided with individual measurement values, the
"accuracy" value indicated is the accuracy of such data. Measurement
procedures and equipment will be maintained in a condition to
meet that requirement.
*)
This is the average value measured for the first batch signal
discs. Disclaimer The information contained herein and contained on the disc are believed to be accurate as of the date of publication, however the publisher of this data will not be liable for any damages, including indirect or consequential from the use of this information. This information can change without notice.
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