GB/T 14855-1993 General technical specification for the quality of audio cassette products
Some standard content:
National Standard of the People's Republic of China
GB/T 14855—1993
General specification of quality for pre-recorded audio cassette
Issued on December 30, 1993
Implementation on September 1, 1994
Issued by the State Administration of Technical Supervision
National Standard of the People's Republic of China
General specification of quality for pre-recorded audio cassette
1 Subject content and scope of application
GB/T14855—1993
This standard specifies the technical quality and test methods of audio cassette products, as well as the basic requirements for acceptance, marking, transportation and storage. This standard applies to cassette tape products with a bandwidth of 3.81mm and a tape speed of 4.76cm/s, and can be used as a technical basis for product qualification, delivery acceptance, and quality certification.
2 Reference standards
GB2019
GB2828
GB3791
GB7309
GB11956
Basic parameters and technical requirements for tape recordersBatch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection)Cassette tape dimensions and mechanical characteristics
General technical conditions for cassette tapes
High-speed duplication tapes||t t||ZBM71001
ZBM71002www.bzxz.net
Technical requirements for cassette tape cassette-to-cassette duplication systemTechnical requirements for cassette tape duplication system
GY47 Rules for the Description of Audiovisual Materials
3 Terminology
3.1 Pre-recorded audio cassette product refers to the general term for the tape and its container with recorded mono, stereo music or language programs wound on two coplanar disc cores. 3.2 Program timeprogramme time
The time from the beginning to the end of the program. 3.3 Interval time of program refers to the gap between two adjacent programs. 4 Environmental requirements
Test environment
Temperature: 20±5℃
Relative humidity: 45%~75%
Usage environment
Temperature: -10~40℃
Relative humidity: 45%~85%
Promulgated by the State Bureau of Technical Supervision on December 30, 1993 and implemented on September 1, 1994
5 Classification
Cassette tape products shall be classified as specified in Table 1. Category
Literary Program
Language Program
Recording Method
Stereo
Stereo
6 Appearance Requirements
6.1 Cassette Cover
GB/T14855—1993
Reproduction System
Should meet the technical requirements of ZBM71002
Should meet the technical requirements of ZBM71001
or ZBM71002
Tape Used
Not lower than Grade 1 in GB11956
Not lower than Grade B in GB7309
or the qualified grade in GB11956
The printing color of the cassette cover of cassette tape products should be accurate, and the cover should be free of damage and stains. The printed words on the cover should be clear and the content should be accurate. The cassette should be neatly sealed in the outer box, and there should be no tilt at the ridge of the box. 6.2 Box stickers
Each tape box should have box stickers on both sides of the inner box (the content of the box stickers can also be printed directly on the inner box). For inner boxes with screws, the A side of the box sticker should be consistent with the side with exposed screws. The printed words on the box sticker should be clear and the content should be accurate. The pasting should be flat and not skewed. 6.3 Appearance of the tape box
The surface of the tape box (including the inner and outer boxes) should not have burrs, obvious scratches, cracks, damage, dents, bubbles and mildew. The assembly screws, pressure pads, isolation sheets and slides on the box should be complete and there should be no other abnormalities. 6.4 Appearance of the tape
The tape and leader loaded into the tape box should be free of deformation, creases, mildew and magnetic powder shedding. 7 Basic dimensions and mechanical properties
7.1 Cassette dimensions
The inner box dimensions shall comply with the relevant provisions of GB3791, and the outer box dimensions are: Length: 109.5±0.5mm Width: 70.0±0.3mm
Height: 17.0±0.2mm
7.2 Tape dimensions
Bandwidth: 3.81-8.05mm
Tape thickness: not more than 20μm
7.3 Leader tape dimensions
The two ends of each tape shall be bonded with leader tapes, and their dimensions shall comply with the relevant provisions of GB7309. 7.4 Mechanical properties
The mechanical properties of the cassette and tape of the cassette tape product shall comply with the relevant provisions of GB3791, except that the winding torque shall be less than 1mN·m.
8 Requirements for tape winding and bonding to leader tape
8.1 Requirements for tape winding
8.1.1 The magnetic surface of each audio tape should face away from the disc core. 2
8.1.2 The tape should be wound flat.
GB/T14855—1993
8.1.3 Side A of each audio tape is the first playback side. 8.1.4 There should be no joints from the beginning to the end of the tape. 8.2 Requirements for bonding between tape and leader tape
The bonding between the tape and the leader tape should be flat, well connected, and without breakage or debonding. The bonding strength should comply with the relevant provisions of GB3791. 9 Technical quality requirements for programs
9.1 Requirements for program arrangement
9.1.1 Program time arrangement
The program playback time of cassette tape products should be consistent with the program time marked on the box cover. Generally, the duration of the program on side A should be longer than that of the program on side B. When the duration of the program on side B is longer than that of the program on side A, the beginning of the program on side A and the end of the program on side B are required to be consistent on the tape.
9.1.2 Interval between programs
The interval between two adjacent programs on each tape is 5±1min. 9.1.3 Integrity of programs
The beginning and end of each tape program should be complete, and the program should not have abnormal interruptions or abnormal phenomena such as no program on one channel. 9.2 Requirements for program sound quality
9.2.1 Replay level of program signal
When replaying each tape program, the maximum volume should be able to reach 0VU on the volume meter, but it should not exceed it frequently. It is allowed to exceed it for a short time, but it should not exceed +6dB on the peak meter at any time. The volume of the two channels should be basically balanced.
Note: This standard stipulates that 0vU corresponds to 200nwb/m. 9.2.2 Noise
a. Between two programs, there is no signal, and the noise level should be less than -45dB (not weighted). b. From the beginning to the end of each tape program, no sparking sound, AC noise or other noise is allowed. 9.2.3 Distortion
The sound of each tape should not have obvious distortion and abnormality such as pitch change. 10 Testing methods
10.1 Appearance inspection of tape box and tape
Use visual inspection to check the provisions of 6.1, 6.2, 6.3 and 6.4 respectively. 10.2 Measurement of size and mechanical properties
Measure the provisions of 7.1 to 7.4 in accordance with the relevant provisions of GB3791. The size of the outer box is measured with a caliper. 10.3 Measurement of bonding strength between leader tape and tape
Measure in accordance with the relevant provisions of GB3791.
10.4 Technical Quality Inspection of Programs
10.4.1 General Quality Measurement and Inspection
On a cassette recorder that complies with the provisions of GB2019, use a stopwatch to measure the time parameters specified in 9.1.1 and 9.1.2 for each tape to be measured, and at the same time, audit and inspect the other requirements in 9.1.1 and 9.1.3. 10.4.2 Inspection of Program Sound Quality
Use a high-quality recorder (its technical requirements are shown in Appendix A) to replay the tape to be inspected, test and audit its sound quality, and the results should comply with the relevant provisions of Article 9.2.
Use an electronic millivoltmeter to measure the level U of the rated playback state of the high-quality recorder and the noise level U2 of the blank section of the tape to be tested, and take the difference between U2 and 3
GB/T14855-1993
U1, expressed in dB, and its value should comply with the requirements of Article 9.2.2a. 11 Acceptance Rules
11.1 Batch Inspection
Batch inspection shall be carried out in accordance with the relevant provisions of GB2828, using a normal sampling plan. 11.1.1Batch inspection method
Batch inspection is carried out by the quality inspection department of the manufacturer. The batch size is determined by the manufacturer, and generally the products in each production batch should be inspected as a batch. If the user needs inspection, it should be accepted according to the batch divided by the manufacturer. Batch inspection sampling is divided into three groups, as shown in Table 2. Table 2
Inspection items
eGroups A, B, and C all use the special inspection level S-2, and the qualified quality level (AQL) of each group is as follows: Group A: AQL-6.5
Group B: AQL=4
Group C: AQL=10
11.1.2 Batch inspection result processing
When each item of the batch inspection passes, it can be judged as qualified, otherwise it is unqualified. 11.1.3 Strict Inspection and Relaxed Inspection
a Normal inspection is used for batch inspection. When the conditions for normal inspection are not met, strict inspection should be used. When the conditions for relaxed inspection are met, relaxed inspection can be used.
b. The sampling plan, inspection level and acceptable quality level (AQL) specified in the strict inspection and relaxed inspection are consistent with those of normal inspection. 11.2 Special Inspection
11.2.1 Inspection during the production process
When necessary, special inspections can be carried out during the production process for the provisions of Chapter 6 and Chapter 9. 11.2.2 Sampling Plan
During special inspection, 4 boxes of samples are drawn for inspection. If any item does not meet the requirements, the inspection shall be judged as unqualified. 12 Marking, packaging, transportation, purchase and storage
12.1 Marking
12.1.1 Box label marking
The following information should be provided on the box label:
-Side A (or Side B)
Mono (or stereo)
Program name
-Program number
Noise reduction method (when the program has noise reduction processing)
-Trademark
Publishing unit
-Production unit
-Chinese Standard Audiovisual Product Code
GB/T14855-1993
The above content can also be printed directly on both sides of the inner box. 12.1.2 Box seal marking
The following information should be provided on the box seal:
-Program name
Program time
Program number
-Noise reduction method (when the program has noise reduction processing)
-Trademark
Publishing unit
-Production unit
Production license number
Publishing time
China Standard Audiovisual Product Code
12.2 Packaging
12.2.1 Single box packaging
Single box packaging The outer box should be packaged with transparent paper or plastic film. The packaging should be flat and beautiful, without warping, accumulation or damage. a.
For multiple box sets, in addition to the program serial number, the outer box marking should meet the requirements of 12.1.2. b.
12.2.2 Medium packaging
10 or 50 individual boxes make up a medium packaging, and each medium packaging should have a product inspection certificate. 12.2.3 Transport packaging
100 or 200 individual boxes make up a transport packaging. The following information should be printed on the outside of the transport packaging box: Product name
-Program number
-Quantity
-Weight
-Dimensions
Production unit
Safety signs during transportation
12.3 During transportation
, attention should be paid to preventing moisture, shock, dust, magnetism, exposure to the sun and heavy pressure. 12.4 Storage
Storage conditions: Temperature: 5~30℃
Relative humidity: 35%~75%
Prevent from dust, stay away from magnetic fields and heat sources, and place in a cool, dry and ventilated place. 5
GB/T14855—1993
Appendix A
Technical requirements for high-quality sound players
(Supplement)
The technical requirements for high-quality sound players are as follows: Jitter: ±0.05% (weighted)
Tape speed: 4.76cm/s
Tape speed error: <0.2%
Frequency response: 2016000Hz±3dB
Signal-to-noise ratio: better than 64dB (weighted)
60dB (unweighted)
Total harmonic distortion of playback: <1.0%
Crosstalk: 57dB
Channel isolation: 30dB
Additional notes:
This standard is proposed by the Ministry of Radio, Film and Television. This standard is under the technical supervision of the Standardization Planning Institute of the Ministry of Radio, Film and Television. This standard was drafted by China Record Corporation, Broadcasting Science Research Institute, and the Science and Technology Department of the Science and Technology Department. The main drafters of this standard are Chen Yongzhi, Ling Sanhua, and Hu Cuiying.2%
Frequency response: 2016000Hz±3dB
Signal-to-noise ratio: better than 64dB (weighted)
60dB (unweighted)
Total harmonic distortion of playback: <1.0%
Crosstalk: 57dB
Channel isolation: 30dB
Additional instructions:
This standard is proposed by the Ministry of Radio, Film and Television. This standard is technically managed by the Standardization Planning Institute of the Ministry of Radio, Film and Television. This standard is drafted by China Record Corporation, Broadcasting Science Research Institute, and the Science and Technology Department of the Science and Technology Department. The main drafters of this standard are Chen Yongzhi, Ling Sanhua, and Hu Cuiying.2%
Frequency response: 2016000Hz±3dB
Signal-to-noise ratio: better than 64dB (weighted)
60dB (unweighted)
Total harmonic distortion of playback: <1.0%
Crosstalk: 57dB
Channel isolation: 30dB
Additional instructions:
This standard is proposed by the Ministry of Radio, Film and Television. This standard is technically managed by the Standardization Planning Institute of the Ministry of Radio, Film and Television. This standard is drafted by China Record Corporation, Broadcasting Science Research Institute, and the Science and Technology Department of the Science and Technology Department. The main drafters of this standard are Chen Yongzhi, Ling Sanhua, and Hu Cuiying.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.