1、 _ SUPTE RP*107 95 m 8357401 0002099 796 m SMPTE RECOMMENDED PRACTICE RP 107-1995 Revision of RP 107-1988 Video and Audio Reference Tape for 1-in Type B Helical-Scan Format 1 Scope This practice specifies a video and audio reference tape to be used with 1-in type B helical-scan video tape recorders
2、as defined in ANSVSMPTE 15M. It is i to be used for: ! indication of video frequency response charac- teristics for both main and sync channels of the reproducing system; adjustment of gain of the video reproducing system; comparison of carrier frequencies of the video recording system; verification
3、 of level and phase of the control track recording system; adjustment of the gain of the program audio repro- ducing system; indication of the audio frequency response of the audio reproducing system; comparison of the audio recording gain and frequency response characteristics of the audio recordin
4、g system; verification of levels and timings of time code infor- mation recorded on audio 3 record. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the editions indicated were
5、 valid. All standards are subject to Page 1 of 4 pages revision, and parties to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI 54.6-1 982 (R1992), Method of Measuring Recorded Flux of Magnetic
6、 Sound Records at Medium Wavelengths ANSVSMPTE 12M-1995, Television, Audio and Film - Time and Control Code ANSVSMPTE 17M-1992, Television Analog Record- ing - 1-in Type B Helical Scan - Frequency Response and Operating Level ANSVSMPTE 26M-1995, Video Recording - 1 -in Helical-Scan Recorders - Raw S
7、tock for Reference Tapes ANSI/SMPTE 29M-1995, Television Analog Record- ing - 1-in Type B Reference Recorders - Basic System and Transport Geometry ANSVSMPTE 30M-1995, Television Analog Record- ing - 1-in Type B Reference Recorders - Records on Reference Tapes EIA 189-A, Encoded Color Bar Signal EIA
8、 Industrial Electronic Tentative Standard No. 1, Color Television Studio Picture Line Amplifier Output Drawing IEEE 205-1 958 (R1972), Method of Measurement of Television Luminance Signal Levels NAB Standard for Magnetic Tape Recording and Reproducing (Reel-to-Reel) Copyright O 1995 by the SOCIETY O
9、F MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (91 4) 761 -1 1 O0 Approved March 5, 1993 RP 107-1995 SMPTE RP 83-1992, Specifications of Tracking Con- trol Record for l-in Type B Helical-Scan Television Analog Recording SMPTE RP 84-1 992, Reference Carrier Fr
10、equencies and Preemphasis Characteristics for 1-in Type B Helical-Scan Television Analog Recording SMPTE RP 93-1 994, Requirements for Recording American National Standard Time and Control Code for 1 -in Type B Helical-Scan Video Tape Recorders 3 General specifications 3.1 Recorder The recorder used
11、 to record this tape shall comply with ANSVSMPTE 29M. 3.7 Recorded audio flux levels The record reference level and the record flux level versus frequency shall conform to ANSVSMPTE 17M, except that the short circuit flux recorded on the tape at each frequency shall be within 10.5 dB of the level sp
12、ecified. The tolerance off 0.5 dB may be extended to f 2 dB provided that the manufacturer supplies a calibration chart with the reference tape. 3.8 Audio test calibration The calibration values in decibels furnished with the reference tape shall represent the levels to be added algebraically to the
13、 reproducer output level when the particular reference tape is reproduced. With the addition of these values, the output level of the repro- ducer will be that which would have resulted if the short circuit flux on the reference tape at a given frequency had been exactly as specified in ANSVSMPTE 17
14、M. 3.2 Dimensions of records 3.9 Audio flutter The dimensions of pertinent records making up this test tape shall conform to ANSVSMPTE 30M. 3.3 Tape stock The unweighted flutter of this recording shall not exceed 0.1% RMS, measured in accordance with NAB Standard on Magnetic Tape Recording and Repro
15、ducing (Reel-to-Reel). The tape stock shall be as specified in ANSVSMPTE 26M. 3.4 Tracking control signal The tracking control signal shall conform to SMPTE RP 83 and ANSVSMPTE 30M. 3.5 Recorded video parameters The recorded video parameters shall conform to those specified in SMPTE RP 84, except th
16、at the tolerances in table 1 are tightened to f 0.025 MHz and the nominal values in other sections shall be held as close as possible. 4 Recorded signals 4.1 Voice announcements Voice announcements at the beginning of this tape shall reference this practice. Voice announcements shall be recorded at
17、a level approximately 5 dB below reference level. These announcements shall be recorded on audio 1 record and audio 2 record. A video identification signal may be included during the voice announcement section. If no video identification signal is used, sync, burst, and setup or test signal shall be
18、 recorded on the video channel during the voice announcement. 4.2 Video signals 3.6 Video signals Video synchronizing waveforms and video amplitudes shall conform to EIA Industrial Electronics Tentative 4.2.1 Color bars Standard No. 1 to ensure proper color framing. Blank- ing width shall be 10.7 ps
19、 horizontal and 20 lines verti cal. Seven types of video signals, as specified in 4.2.1 through 4.2.7, shall be recorded on the tape. A 100% saturated, 75% amplitude color bar signal conforming to EIA 189-A. Page 2 of 4 pages 4.2.2 Multiburst A white pulse followed by a series of six sine wave burst
20、s. The white pulse width and the width of each sine wave burst should be 1h the width of the scan line between the end of H blanking and the start of H blanking. The white bar level shall be at 100 IRE units I 1 IRE unit. The axis of the burst shall be at a level of 55 IRE units f 1 IRE unit. The pe
21、ak-to-peak ampli- tude of the bursts shall be 90 IRE units t 1 IRE unit. The frequencies of the bursts in time sequence shall be 500 kHz, 1.5 MHz, 2.0 MHz, 3.0 MHz, 3.58 MHz, and 4.2 MHz. A 1 4.2.3 Ramp Acontinuous ramp extending from O to 100 IRE units and repeating at line rate. Color subcarrier h
22、aving a peak-to-peak amplitude of 40 IRE units f 2 IRE units shall be added to the ramp signal. 4.2.4 Window and pulses A window signal, a modulated 12.5T (1.56 ps) pulse, and a 2T (0.25 ps) sine-squared pulse. All signals shall extend from 7.5 IRE units f 2.5 IRE units to 1 O0 IRE units f 1 IRE uni
23、t. The window shall have a 1T rise time. 1 ? 4.2.5 Chroma field Aflat, full-field signal corresponding to the cyan bar of EIA 189-A color bars at 75% amplitude. i 4.2.6 Gray field A flat, full-field signal at 50 IRE units. R P 107-1 995 4.3.1 Frequency response This section is to be used to calibrat
24、e the frequency response of the audio reproducing system of a video magnetic tape recorder. The test signals shall be recorded at a flux level corresponding to 1 O dB below the reference level. The test segment frequencies shall be recorded as follows: 1 kHz (reference), 63 Hz, 125 Hz, 250 Hz, 500 H
25、z, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 1 O kHz, 12.5 kHz, 16 kHz, and 1 kHz (secon- dary reference). The frequency of each recording shall be f 3% of its specified value when the tape is reproduced at exactly 245 mns. Each frequency shall be preceded by a voice announcement identify- ing that frequency. 4.3
26、.2 Stereo phase test A 4-kHz tone shall be recorded at reference level on each channel. The recorded stereo phase error between channels 1 and 2 shall be less than 5“. 4.3.3 Crosstalk test Tones of 63 Hz, 1 kHz, and 16 kHZ shall be recorded on channel 1 only and then channel 2 only for a test of aud
27、io channel crosstalk. These signals shall be recorded at 8 dB above the reference level. A recorded crosstalk calibration shall be supplied with the reference tape. 4.3.4 SMPTE time and control code test SMPTE time and control code complying with ANSVSMPTE 12M and SMPTE RP 93 shall be recorded on au
28、dio 3 channel. 4.2.7 Vertical interval test signals Vertical interval test signals will be added to both fields as follows: 4.4 Sequence The video and audio reference signals shall be Line 17 2T and 12.5T pulses and 1 T bar: Line 19 multiburst. recorded in the sequence and for the duration shown in
29、table 1. 4.3 Audio signals 4.4.1 Time tolerance The tolerance of all start and end times shown in table 1 shall be f 5.0 s. A I Audio signals as specified in 4.3.1 through 4.3.3 shall be recorded on the tape. Page 3 of 4 pages _ _ SMPTE RPU107 95 W 8357LE01 O002102 O00 RP 107-1995 5 Calibration 5.1
30、Video calibration 5.1.1 Video level measurements All video measurements of luminance level shall be made in accordance with IEEE 205. 5.2 Audio calibration 5.2.1 Calibration of short-circuit tape flux The short-circuit tape flux on the test tape shall be determined by means of the calibrated short-g
31、ap ferromagnetic core reproducer technique. This tech- nique is described in the following references: American National Standard ANSI S4.6. McKnight, J.G. Flux and flux-frequency response measurements and standardization in magnetic re- cording. Journal of the SMPTE 78:457-472; 1969 June. Lovick, R
32、.C., Bartow, R.E., and Scheg, R.F. Re- cording and calibration of super8 magnetic repro- ducer test films. Journal of the SMPTE 78:473-481; 1969 June. Table 1 - Reference signal sequence Video Audio 1 Audio 2 Audio 3 Start End Multibursts Ramp Window and pulses Color bars Chroma field Mu Iti burst -
33、Mu Iti burst Mu It burst Mu It i burst Ramp Ramp Ramp Window and pulses Color bars 50 IRE gray field 1 kHz 63 Hz 4 kHz 16 kHz Silent I kHz (+8 dB) 63 Hz (+8 dB) 16 kHz (+8 dB) Silent Silent Silent Silent Frequenc response Frequenc response Frequenc response (-10 dB) 1Y (-10 dB) Y (-10 dB) Y 1 kHz 63
34、 Hz 4 kHz 16 kHz Silent Silent Silent Silent 1 kHz (+8 dB) 63 Hz (+8 dB) 16 kHz (+8 dB) Silent Frequenc response Frequency response Frequency response (-10 dB) 1Y (-10 dB)l) (-10 dB)l) 1 kHz 63 Hz 4 kHz 16 kHz Silent Time code Time code Time code Time code Time code Time code Time code Frequency res
35、ponse Frequenc response Frequenc response (-10 dB) 17 (-1 O dB) 1 ) (-10 dB) 1Y 00.00 o1 :o0 02:oo 03:OO 04:OO 05:OO 05:15 05:30 05:45 06:OO 06:15 06:30 07:OO 08:OO 09:oo o1 :o0 02300 03:OO 04:OO 05:OO 05:15 05:30 05:45 06:OO 063 5 06:30 07300 08:OO 09:oo 1o:oo NOTE - Frequency response sequence: 1 kHz (reference), 30 seconds; each tone, 12 seconds; and fin 1 kHz (secondary reference), 18 seconds. )Relative to reference level. Annex A (informative) Bibliography ANSI/SMPTE 15M-1992, Television Analog Recording - 1 -in Type B Helical Scan - Basic System Parameters Page 4 of 4 pages
