SMPTE RP 18-1995 Specifications for Test Film for Subjective Checking of 16-mm Motion-Picture Audio Projectors.pdf

1、 SMPTE RP*3B 95 8357403 00020Y9 360 RP 18-1995 Revision of RP 18-1991 SPecifications for Test Film for Subjective Checking of 16-mm Motion-Picture Audio Projectors 1 Scope This practice describes a test film and a method for subjective checking and demonstrating 16-mm motion-picture projection and a

2、udio performance. 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 valid. All standards are subject to revision, and parties to agreements based on

3、this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSVSMPTE 41 -1 994, Motion-Picture Film (1 6-mm) - Prints - Photographic Audio Records ANSI/SMPTE 109-1 992, Motion-Picture Film (1 6-mm) - Perforated 1 R and 2R ANSVSMP

4、TE 112-1 994, Motion-Picture Film (1 6-mm) - 1 00-Mil Magnetic Audio Record ANSVSMPTE 233-1 992, Motion-Picture Film (1 6-mm) - Projectable Image Area and Projector Usage SMPTE RP 67-1 993, Specifications for Buzz-Track Test Film for 16-mm Motion-Picture Audio Repro- ducers, Photographic Type 3 Test

5、 film specifications 3.1 Where applicable, the film shall contain the following sections: Page 1 of 2 pages 3.1 -1 Audio samples a) Dynamic wide-range orchestration to check repro- duction of music. b) A recording of piano music having sufficiently sustained notes that a subjective assessment of wow

6、 and flutter can be made. c) Seven tones (nominally 50, 125, 500, 800, 2000, 31 50, and 5000 Hz) recorded at normal program level. d) A section of male and female actors in dialog as a check for speech intelligibility and synchronization. 16-mm photographic audio version only: e) A section of buzz-t

7、rack test film as specified in SMPTE RP 67. 9 Three sections of a 5-kHZ tone to check for a compromise focus for the photographic audio record; sections one and three in the normal emulsion posi- tion and section two in a reverse emulsion position. 3.1.2 Picture samples a) General picture steadiness

8、 (vertical and horizontal). b) Uniform projected picture luminance. c) General picture quality such as sharpness and contrast. 3.2 Each film shall be provided with a leader and trailer. The main title shall include the issue number. Titles or subtitles, as appropriate, shall indicate the particular

9、projector audio and/or picture characteristic to be tested by that portion of the film. Copyright Q 1995 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved August 1 O, 1995 (914) 761-1 100 RP 16-1995 3.3 Each film shall be accompanied by

10、an instruction sheet describing the procedure to be used for checking the projection equipment. 4 Prints 4.1 The film stock used shall be cut and perfo- rated in accordance with long-pitch dimensions specified in ANSIEMPTE 109. Annex A (informative) Procedure A.l Meihodofuse With the projector set u

11、p for projection of an audio picture print and the loudspeaker(s) properly located in accordance with the instructions furnished with the equipment, proceed as follows: a) Pre-set tone control(s) to normal, thread test film into projector, and set volume for comfortable loudness. If the audio optics

12、 have adjustable focus, adjust the focus to give the most satisfactory audio quality. b) Frame and focus picture for best overall screen image. A.2 Audio and visual qualities As the test sections are projected, observe the following: a) Listen for full range of orchestra and overall quality of audio

13、. Note picture steadiness at top and sides. Note picture sharpness across the entire frame. White streaks above or below letters indicate travel ghost. 4.2 The audio record dimensions shall comply with ANSVSMPTE 41 or ANSVSMPTE 112. 4.3 Color prints shall be made with the emulsion toward the lens fo

14、r direct-projection viewing. The prints shall be in accord with ANSVSMPTE 233. NOTE -Test films conforming to this practice are available from the Society of Motion Picture and Television Engineers. b) Look for uniform picture brightness. Listen for smooth, even music; quaver indicates flutter. c) S

15、ilence or equal loudness of the two tones of the buzz- track shows correct lateral positioning of the audio producer (photographic record only). d) In the photographic audio version, three successive tones (5000 Hz) are included to permit detection of correct audio focus. Emulsion position is revers

16、ed for the second (middle) tone. (To compensate for prints which may be projected emulsion to the lens or emulsion away from the lens, a compromise position of the photographic audio-fo- cusing optics must be determined so that the audio level results in equal loudness between the two positions. The

17、 difference between the two positions can be considered as the midpoint of the film, 0.0035 in (0.089 mm) below the surface .) e) Seven tones are provided having the frequencies of 50 to 5000 Hz. All should reproduce well. f) Listen for natural quality of the audio and proper lip synchronization of voices. Page 2 of 2 pages