SMPTE EG 24-1995 Video and Audio Alignment Tapes and Procedures for 1-in Type C Helical-Scan Television Analog Recorders.pdf
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1、 SMPTE EG*24 95 = 357401 0002107 692 EG 24-1995 SM PTE ENG IN EERI NG G U I DELI N E Revision of EG 24-1991 Video and Audio Alignment Tapes and Procedures for 1 -in Type C Helical- Scan Television Analog Recorders 1 Scope This guideline describes the use of a manufacturers alignment tape(s) intended
2、 for aligning type C televi- sion analog recorders to SMPTE specifications. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this guideline. At the time of publication, the editions indicated were valid. All standards a
3、re subject to revision, and parties to agreements based on this guideline are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI S4.6-1982 (R1992), Method of Measuring Recorded Flux of Magnetic Sound Records at Medium Wavelengths ANSV
4、IEEE 152-1 992, Audio Program Level Measure- ment ANSVSMPTE 12M-1995, Television, Audio and Film - Time and Control Code ANSVSMPTE 19M-1991, Television Analog Record- ing - l-in Type C - Records ANSVSMPTE 20M-1991, Television Analog Record- ing - I-in Type C Recorders and Reproducers - Longitudinal
5、Audio Characteristics ANSVSMPTE 26M-1995, Video Recording - 1 -in Helical-Scan Recorders - Raw Stock for Reference Tapes EIA -1 89-A, Encoded Color Bar Signal Page 1 of 6 pages IEEE Std 205-1958 (R1972), Method of Measure- ment of Television Luminance Signal Levels NAB Standard for Magnetic Tape Rec
6、ording and Reproducing (Reel-to-Reel) SMPTE RP 85-1991 (R1995), Tracking-Control Record for 1 -in Type C Helical-Scan Television Tape Recording SMPTE RP 86-1991 (R1995), Video Record Para- meters for I-in Type C Helical-Scan Television Tape Recordi ng IEC Publication 94, Magnetic Tape Sound Recordin
7、g and Reproduction Systems: Dimensions and Char- acteristics ITU-R Report 624-4 (MOD F), Characteristics of Television Systems 3 General specifications 3.1 Recorder The recorder used to record this tape shall comply with ANSVSMPTE 19M. 3.2 Record dimensions The dimensions of pertinent records making
8、 up this tape shall conform to ANSVSMPTE 19M. 3.3 Tape stock The tape stock shall be as specified in ANSVSMPTE 26M. Copyright O 1995 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved October 17, 1995 (914) 761-1 100 SMPTE EG*E4 95 835740
9、3 0002308 529 = EO 24-1995 3.4 Tracking control signal 4.3 Audio signal specifications The tracking control signal shall conform to SMPTE RP 85, except that the tolerance specified in clause 3.1 shall be tightened to f 0.4 ms. 3.5 Time and control code The following specifies the various generic sig
10、nals which might be used on a tape. If signals other than these are used on a tape, the nature of the actual signals shall be carefully and fully defined. Time and control code, if provided, shall conform to 4.3.1 Recorded audio flux level ANSI/SMPTE 12M, and shall be recorded on audio 3 The recorde
11、d reference level shall conform to ANSI/SMPTE 20M, except that the short circuit flux recorded on the tape at each frequency shall be within record. The reference flux level for time and control code shall be as defined in ANSVSMPTE 20M. 4 Audio 4.1 General notes f 0.5 dB of the level specified. The
12、 tolerance, f 0.5 dB, may be extended to 12.0 di3 provided the manu- facturer supplies a calibration chart with the tape (see annex A). 4.1.1 Test equipment 4.3.2 Audio test calibration Properly calibrated test equipment including, but not limited to, an rms voltmeter as specified in ANSI/IEEE 152,
13、Or equivalent, is essential for the following tests. 4.1.2 Procedures All adjustments must be made with due attention to the machine manufacturers instructions. The calibration values in decibels furnished with the tape shall represent the levels to be added algebra- cally to the reproducer output l
14、evel when the particular tape is reproduced. With the addition of these values, the output level of the reproducer in decibels will be that which would have resulted if the short circuit flux on the tape at a given frequency had been exactly as specified in ANSVSMPTE 20M. 4.1.3 Audio calibration 4.3
15、.3 Audio flutter McKnight, J.G. Flux and flux-frequency response measurements and standardization in magnetic re- cording. Journal of the SMPTE. 78(6): 457-472; June 1969. Lovick, R. C.; Bartow, R. E.; and Scheg, R. F. Record- 4.3.4 Signals All recorded signals shall conform to ANSVSMPTE 20M unless
16、otherwise specified. ing and calibration of super-8 magnetic reproducer test films. Journal of the SMPTE. 78(6): 473-481 ; June 4.3.5 Reference level tone 1969. 4.2 Confidence heads The reference level tone shall be 1000 Hz f 2% recorded at the reference flux level. All audio adjustments should be m
17、ade to the confi- dence/monitor heads as well as the main recordplay heads to ensure maximum quality in all modes of operation. level. 4.3.6 Pink noise Pink noise, if recorded, shall be 10 dB below reference Page 2 of 6 pages SMPTE EG*(24 95 E 8357401 0002109 465 W 4.3.7 Frequency response The follo
18、wing signals, recorded 10 dB below refer- ence level, shall be contained in this section: 1 kHZ (reference), 63 Hz, 125 Hz, 250 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 10 kHz, 12.5 kHz, 16 kHz, 1 kHz. The frequency of each recorded signal shall be f 3% of its specified value. The tones shall be recorded in
19、the order given. Each tone shall have a duration of at least 20 seconds except the initial and final 1 kHz reference tones whose duration shall be at least 30 seconds. 4.3.8 Azimuthlstereo phase Azimuth/ctereo phase shall be as specified in ANSVSMPTE 20M, but be tightened to ensure that the relative
20、 phase relationship between the audio 1 and audio 2 signals does not exceed 10“ within the speci- fied range of 1 O0 Hz to 12 kHz. The required frequen- cies shall be as specified in IEC 94. 4.3.9 Crosstalk Tones of 63 Hz, 1 kHz, and 16 kHz shall be recorded on channel 1 only and then channel 2 only
21、. These tones shall be recorded + 8 dB above reference level. 4.4 Definitions 4.4.1 flux level: The absolute short-circuit recorded magnetic flux level in nanowebers per meter (nWb/m). ANSI/SMPTE 20M defines the standard audio reference flux density (see annex A). 4.4.2 frequency response: The ampli
22、tude vs fre- quency characteristic of a circuit or flux given as the frequency-by-frequency deviation, in deci- bels, from either zero deviation or from a speci- fied response. 4.4.3 azimuth: The angle, in a plane parallel to the tape, between the head gaps and a line drawn perpendicular to the refe
23、rence edge of the tape. 4.4.4 height: The distance of a head or record, along the plane of the tape, perpendicular to the reference edge of the tape. 4.4.5 rotation: Rotation of a head around a line which is parallel to the plane of the tape (drawn EG 24-1995 through the centerline of the head as de
24、fined by the manufacturer) and perpendicular to the ref- erence edge of the tape. 4.4.6 zenith: The angle, in a plane perpendicu- lar to the tape, between the head gaps and a line drawn perpendicular to the reference edge of the tape. 4.4.7 peak value: The true peak value of the sig- nal, measured b
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