GB/T 15860-1995 General technical requirements for laser disc players
Some standard content:
ICS33.160.30
National Standard of the People's Republic of China
GB/T15860—1995
General specification for compact disc players
General specification for compact disc players1995-12-22 Issued
State Administration of Technical Supervision
Implementation on 1996-08-01
National Standard of the People's Republic of China
General specification for compact disc players
General specification for compact disc playersGB/T15860—1995
This standard adopts the international standards IEC908 "CD Digital Record System" (1987 edition) and EC1096 "Methods for measuring characteristics of CD players" (1992 edition).
1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of compact disc players. This standard applies to various home CD players and the CD part of various home audio systems. 2 Reference standards
IEC958Digital audio interface
ISOR2661)
Optimal frequency for acoustic measurement
GB2018
GB2828
GB2829
GB4013
Packaging storage and transportation pictorial signs
Tape recorder measurement method
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability) Audio and video recording terms
GB8898
GB9375
GB9383
GB9384
GB12058
GB13837
Equipment reliability test Validity test of constant failure rate assumption Equipment reliability test Verification test scheme for failure rate and mean time between failures under the assumption of constant failure rateGraphic symbols for electrical equipment
Safety requirements for household and similar general purpose electronic and related equipment powered by mains powerListening test for radios and recorders
Methods for measuring conducted immunity characteristics of broadcast receivers and related equipmentEnvironmental test requirements and test methods for broadcast radios, broadcast and television receivers, tape recorders, audio power amplifiers (amplifiers)
Loudspeaker listening test
Allowable values and measurement methods for interference of sound and television broadcast receivers and related equipmentGB/T14197
GB/T14277
Instructions for adoption:
Preferred matching values for interconnection of sound system equipment
General technical conditions for audio combination equipment
1) The translation of this standard is provided by the National Technical Committee for Standardization of Electroacoustics. Approved by the State Administration of Technical Supervision on December 22, 1995, and implemented on August 1, 1996
3 Terminology
GB/T15860—1995
Except for the following terms, other terms used in this standard shall be in accordance with the provisions of GB4013. 3.1 Reference valuereferencevalue
A specified value of any parameter selected as the reference for other compared values. 3.2 Reference recording levelreferencerecodinglevelA specified recording level selected as the reference for all other compared recording level values (the full-scale digital recording level in this standard is 0dB). 3.3Track
A multi-turn spiral trace on a CD formed by a sequence of discrete pits corresponding to a certain piece of music. In order to facilitate the selection of different tracks, each track must be numbered in sequence, which is called track number (TNo.). 3.4Reference signalreferencesignal
It is specified as a reference frequency (1kHz), reference recording level (full scale), and a level calibration signal without pre-emphasis. 3.5 Reference frequency referencefrequency The frequency selected as the reference point during measurement (the reference frequency in this standard is 1kHz). 3.6 Reference output voltage referenceoutputvoltage The voltage across the load impedance when reproducing the reference recording level of the reference frequency. 3.7 Maximum power consumption maximum power consumption The maximum power that the CD player can obtain from the power supply during operation. 3.8 Channel unbalance at 1kHz The output level difference between channels under the conditions of reference recording level and reference frequency 3.9 Cross-talk cross-talk
Under test conditions, the difference between the useful signal level in the left (or right) channel and the useless signal level generated by the signal in the right (or left) channel, expressed in decibels.
3.10 Frequency response frequencyresponse The variation of the output level (relative to the level of the reference frequency) reproduced by a specified signal through any channel with frequency. 3.11 De-emphasis frequencyresponse The variation of the output level (relative to the level of the reference frequency) reproduced by a specified signal through any channel with de-emphasis with frequency.
3.12 Signal-to-noise ratio signal-to-noise ratio The ratio of the playback output level of the reference signal to the noise level of the playback output of the digital silent signal part. 3.13 Dynamic range dynamicrange
The value of noise plus distortion relative to the reference recording level. 3.14 Distortion and noise distortion and noise voltage ratio of the harmonics and noise voltage other than the fundamental component to the reference output voltage. 3.15 Intermodulation distortion intermodulation distortion The ratio of the effective value of all frequency components generated by intermodulation to the effective value of the modulation frequency component. 3.16 Frequency error frequencyerror
The ratio of the difference between the playback signal frequency and the original recorded signal frequency to the original recorded signal frequency, expressed as a percentage. 3.17 Phase difference between channels The phase difference between the left and right channel outputs at the specified frequency. 3.18 Level non-linearity levelnon-linearity The actual deviation of the output signal level from the specified level on the record. 3.19 Access time
GB/T15860—1995
The time from the issuance of the play start command until the selected track actually releases the signal. 3.20 Short access time shortaccesstime In the play or preparation state (the remaining playing time is more than 3 minutes), the time from the issuance of the "play" start command of the adjacent track to the start of playback of the track.
3.21 Long access time longaccesstime In the play or preparation state, the time from the first track to the start of playback of the last track after the "play" start command is issued.
4 Technical requirements
4.1 Conditions of use
Specified by the product standard.
4.2 Appearance, mechanical structure and functional requirements
The product appearance should be neat, and the surface should not have defects such as dents, scratches, cracks, deformations, burrs, mildew spots, etc. The surface coating should not bubble, crack or fall off. Metal parts should not have rust or other mechanical damage. The injection material should not overflow. The operation of switches, buttons and knobs should be flexible and reliable, the parts should be tightened without looseness, and the indication should be correct. Various functions should work normally. The text and graphic symbols indicating the functions should be correct, clear, straight and firm, and the graphic symbols should comply with GB5465.2. The instruction manual should be able to guide users to use and maintain correctly. 4.3 Interconnection and matching requirements
4.3.1 Digital audio interface
According to the provisions of IEC958.
4.3.2 The preferred matching value for interconnection of sound system equipment shall be in accordance with the provisions of GB/T14197.
4.3.3 Digital output
According to the provisions of IEC958.
4.4 Electrical performance requirements
CD players are divided into three levels: A, B and C according to their electrical performance requirements. The parameters and requirements of each level are shown in Table 1. Table 1: Electrical performance parameters and requirements of various levels of CD players
Performance requirements
Reference output voltage
1kHz channel imbalance
Crosstalk (L→R, fundamental wave)
Frequency response
De-emphasized frequency response
Signal-to-noise ratio
2V±1.7dB | kHz)
≥75dB
2V±3dB
≥70 dB(1 kHz)
(125Hz~10kHz)
(16Hz~20kHz)
(125Hz~16kHz)
≥90dB
(125Hz~10kHz)
(31.5Hz~16kHz)
(125Hz~16kHz)
≥80dB
Dynamic range
Distortion plus noise
Intermodulation distortion
Frequency error
Phase difference between channels
Reading time
Level nonlinearity
Maximum power consumption
Safety requirements
Performance requirements
GB/T15860—1995
Continued Table 1
≥95dB(1kHz)
≤-100 dB(1 kHz)
≤-90dB
(31.5Hz~20kHz)
≤-80dB
Safety requirements should comply with the provisions of GB8898, see Table 2. Table 2
Laser radiation
Temperature rise under normal working conditions
Temperature rise under high temperature environment
Electric shock hazard under normal conditions
Insulation requirements
Fault conditions
Mechanical strength
Components
Connection terminals
External soft wire
Electrical connection and mechanical fixation
Mechanical stability
Electromagnetic compatibility requirements
≥85dB(1kHz)
<-80 dB(1 kHz)
≤-70 dB
(31.5Hz~20 kHz)
≤-60dB
Specified by product standards
Safety test items, requirements and test methods
≥75dB(1 kHz)
≤-60 dB(1 kHz)
≤-50 dB
Requirements and test methods (according to GB8898) Articles 5.1~5.7
Articles 7.1~7.2
Articles 8.1~8.2
Articles 9.1.1~9.3.14
Articles 10.1~10.3
Articles 11.1~11.2
Articles 12.1~12.4
Articles 14.1~1 Article 4.8 (except 14.4)
Articles 15.1.1~15.4.2
Articles 16.1~16.6
Articles 17.1~17.7
Articles 19.1~19.2
4.6.1 Interference characteristic requirements
GB/T15860—1995
The interference characteristics shall comply with the provisions of GB13837, see Table 3. Table 3 Interference characteristic requirements
Measurement items
Injected power supply RF interference voltage1)
Local oscillator radiated interference field strength
Symmetrical interference
150kHz
500kHz
Frequency range
500~1605kHz
1605kHz~30MHz
Asymmetric interference
150kHz
500kHz
500~1605kHz
1605kHz~30MHz
≤300MHz
>300MHz
Note: 1) In the frequency band of 150~500kHz, the limit value decreases linearly with the increase of the logarithm of the frequency. 4.6.2 Conducted Immunity Requirements
For the immunity limits of interference flowing into the power supply, headphone and other terminals, see Table 4. Table 4 Conducted Immunity Limits
Interference Signal Frequency Range
0.15~1.6MHz
1.6~30MHz
30~100MHz
100~150MHz)
Note: 1) The limit value decreases linearly with the increase of the logarithm of the frequency. 4.7 Environmental Adaptability Requirements
4.7.1 High Temperature Load
The CD player should be able to work continuously for 16 hours at a temperature of 40℃. 4.7.2 High temperature storage
Limit value
≤59dBμv
<46dBuv
46dBμv
<56dBμv
≤52dBμv
≤52dBμv
<60dB(μV/m)
<52dB(μuv/m)
<56dB(μV/m)
126dBμy
120dBμV
120~110dBμV
The CD player shall be placed at a temperature of 55°C for 2h. After recovery, its appearance, mechanical structure and function, as well as its main performance shall comply with the requirements of 4.2 and 4.4 respectively.
4.7.3 Steady damp heat
The CD player is placed at a temperature of 40℃ and a relative humidity of 93% for 48 hours. After recovery, its appearance, mechanical structure, function and main performance shall meet the requirements of Articles 4.2 and 4.4 respectively. 4.7.4 Low temperature load
GB/T15860—1995
The CD player should be able to work continuously for 1 hour at a temperature of -10℃. 4.7.5 Low temperature storage
The CD player is placed at a temperature of -25℃ for 2 hours. After recovery, its appearance, mechanical structure, function and main performance shall meet the requirements of Articles 4.2 and 4.4 respectively.
4.7.6 Sweep frequency vibration
After the CD player is subjected to the sweep frequency vibration test as specified in Table 5, its appearance, mechanical structure and function shall meet the requirements of Article 4.2. Table 5 Requirements for swept frequency vibration test
Frequency range
10~30~10
30~55~30
Displacement amplitude
|Number of swept frequency cycles in each axial direction
At a swept frequency rate of 1oct/min, the time T for a frequency sweep within a certain frequency range is: T =6. 64 ()
Wherein: T——time (min);
f1——sweep frequency lower limit frequency,
f2——sweep frequency upper limit frequency.
4.7.7 Collision
The sample shall vibrate in sequence on three mutually
perpendicular axes according to the working position
(1)
After a CD player has been subjected to a collision test with a pulse peak acceleration of 100m/s2, a duration of 16ms, and 1000 collisions, its appearance, mechanical structure and function shall comply with the provisions of Article 4.2. 4.7.8 Free fall
After a packaged CD player has been subjected to a drop test according to the provisions of Table 6, its appearance, mechanical structure and function and its main performance shall comply with the provisions of Articles 4.2 and 4.4 respectively.
Table 6 Requirements for free drop test
Sample weight
>10～≤25
>25~<50
>50~≤75
>75~≤100
Drop height
Drop surface
Edge and corner drop
Drop height
Drop edge
Drop corner
Three edges
Drop angle
Front side of sample
Any one below
Note: The drop surface falls downward in the order of 3-2-5-4-6 (side 2 is the front, side 3 is the bottom, sides 4, 5, 6 are the sides, and the top surface does not fall). 4.8 Reliability requirements
Number of drops
Once each
The reliability requirements of CD players are expressed in terms of mean time between failures (MTBF). The lower limit of MTBF6 should be greater than or equal to 1500h.
4.9 Sound quality requirements
The sound quality of the CD player should be clear, bright, without obvious defects, and should have a certain degree of strength and fullness, and be able to reproduce the characteristics of the sound source itself. When scoring according to the method specified in Article 5.7.6, the sound quality score should not be less than 4 points. 6
5 Test method
5.1 Appearance, mechanical structure and function inspection
GB/T15860—1995
Inspect the product according to the requirements of Article 4.2 using the sensory inspection method. Defect classification and judgment criteria shall be in accordance with the relevant provisions of Table 9. If there is any objection, the test method of the corresponding item shall be adopted, and the instrument or measuring tool shall be used to measure and judge. 5.2 Electrical performance measurement method
5.2.1 Rated test conditions
When measuring or inspecting, the CD player should be placed as specified, connected to a load resistance of 10kQ ± 5%, and should meet the following test conditions. 5.2.1.1 Environmental conditions
Ambient temperature: 15~35℃;
Relative humidity: 45%~75%,
Atmospheric pressure: 86106kPa
At ambient temperature, the stabilization time of the CD player after it is powered on (ON) shall not be less than 5 minutes. 5.2.1.2 Power supply
AC: 220V±3%, 50Hz±2%;
DC: 3, 6, 9, 12V, deviation: ±2%, ripple factor below 0.1% 5.2.2 Settings of the player under test
5.2.2.1 Volume controller settings
If there are no special provisions, the volume controller should be adjusted so that when the reference signal recorded on the test record is played back, the rated output level (2V) is obtained at the rated load impedance of the specified channel. For players without volume controllers, the measured value conversion can be performed. 5.2.2.2 Settings of other controllers
When there is a noise reduction device related to the measured value, it should be disconnected (OFF) 5.2.3 Test record
The test record should comply with the provisions of Appendix A (Supplement). 5.2.4 Measuring instruments
5.2.4.1 Voltmeter
An AC voltmeter that indicates the effective value of a sine wave should have an indication accuracy of less than ±2% within the range of 4 to 20,000 Hz and a measurement range of -10020 dBV.
When measuring a sine wave, the average value of the sine wave effective value scale can also be used to detect the AC voltmeter. 5.2.4.2 Level recorder
It can record the effective value of a sine wave, and its indication accuracy is within ±2% within the range of 20 to 20,000 Hz. 5.2.4.3 Low-pass filter
The passband is specified to be 4～20000Hz, and the fluctuation within the band is ±0.2dB. At 24.1kHz, the attenuation should be above 60dB. If there is no doubt, a low-pass filter with an attenuation of 18dB/oct at a cut-off frequency of 30kHz can also be used. However, at 44.1kHz and above, the attenuation should be greater than 100dB.
5.2.4.4 Harmonic distortion meter
The indication accuracy is within ±3%, and the remaining harmonics and noise except the fundamental wave can be measured. 5.2.4.5 Voltage amplifier
Within the range of 4Hz～100kHz, the frequency characteristic is flat and has a gain of about 60dB. 5.2.4.6 Weighting filter
A The weighting filter characteristics should meet the requirements of GB2018. 5.2.4.7 Intermodulation distortion meter
It can measure the intermodulation distortion of a 7kHz sine wave modulated by a 60Hz sine wave (amplitude is 4 times that of the 7kHz signal), and the indication accuracy is within 7
±3%.
5.2.4.8 Phase difference meter
GB/T15860—1995
It can measure the phase difference of a sine wave of 20Hz to 20kHz. 5.2.4.9 Frequency counter
It can measure the frequency of a sine wave of 20kHz with 7-bit accuracy. 5.2.4.10 Spectrum analyzer
It can perform frequency analysis on the input signal, with a frequency band of at least 200kHz, and the measurement accuracy within the measurement frequency range is within ±20%. 5.2.5 Measurement method
5.2.5.1 Reference output voltage
The block diagram of the test system is as shown in Figure 1.
If there is a volume controller, the output should be adjusted to the maximum. Then replay the 1kHz signal of the reference recording level on the test record and measure the left and right channel output voltages, expressed in V. Full transition
5.2.5.2 1kHz channel imbalance
The test system block diagram is as shown in Figure 1.
Electrical meter
Use a voltmeter to measure the left (L) and right (R) channel output voltages UL and UR when replaying the reference signal, then: 1 kHz channel imbalance = 20 1g
5.2.5.3 Crosstalk
The test system block diagram is as shown in Figure 2
Test frequency: 1kHz (mandatory);
125Hz, 4kHz, 10kHz (recommended). (2) Replay the reference recording level of the channel on the test record and the crosstalk measurement signal of the channel when there is no signal (digital "0") on the other channel, and measure the playback output of one channel and the leakage to the other test piece. 5.2.5.4 Frequency response Test system block diagram according to Figure 3. a. Test frequency sweep range: 5Hz~20kHz; the ratio of the signal of one channel, expressed in dB. CD information voltmeter point frequency (nominal value): 4, 8, 16, 31.5, 63, 125, 250, 500Hz, 1, 2, 48, 10, 12.5, 1618, 20 kHz. b. Point frequency method
Replay the frequency test signal on the test record, and use a voltmeter to measure the deviation between the playback output level of each frequency and the playback output level of the reference signal.
c Sweep frequency method
Replay the swept frequency test signal on the test record, and use a level recorder to record the deviation between the playback output of each frequency and the 1kHz output level. 8
5.2.5.5 De-emphasis frequency response
The block diagram of the test system is as shown in Figure 3.
Prepare test pieces
Test frequencies are 125Hz, 1, 4, 10, 16kHz. GB/T15860—1995
Wang Ping Ji Zui
Replay the test record with pre-emphasis Record the point frequency test signal and use a voltmeter to measure the change of output level with frequency. The output level of each channel is expressed in decibels relative to the reference frequency output level. 5.2.5.6 Signal-to-noise ratio
The test system block diagram is as shown in Figure 4.
Use a voltmeter to measure the output level A (dB) when replaying the reference signal and the weighted noise output level B (dB) when replaying the digital silent signal, then the signal-to-noise ratio is:
S/N= (A
to the recorder
5.2.5.7 Dynamic range
The test system block diagram is as shown in Figure 5.
Test frequency: 1kHz.
The test of replaying a level 60dB lower than the reference recording level Frequency digital signal, measure the decibel value A of the noise and distortion of the output signal, plus 60dB. That is:
dynamic range = |A|+60
5.2.5.8 Distortion plus noise
Test system block diagram according to Figure 6.
Only the upper war machine
A weighting
Test frequency 31.5, 63, 125, 250, 500Hz, 1, 2, 4, 8, 10, 12.5, 16, 1820kHz. Replay the signal for harmonic distortion measurement, measure the total harmonic distortion plus noise, expressed in decibels or percentage. 9 Test piece
CR machine
Loss point instrument
........( 4)
5.2.5.9 Intermodulation distortion
The block diagram of the test system is shown in Figure 7.
GB/T15860—1995
Test frequency: 60Hz+7kHz (amplitude ratio 4:1). Replay the intermodulation distortion test signal (60Hz+7kHz), and use an intermodulation distortion meter to measure its intermodulation distortion, expressed in decibels or percentages. Note: In order to confirm the intermodulation distortion at high frequency, the intermodulation distortion test signal 11kHz+12kHz (amplitude ratio 1:1) or 19kHz+20kHz (amplitude ratio 1:1) can be replayed.
Test film
5.2.5.10 Frequency error
The block diagram of the test system is shown in Figure 8.
Test frequency: 20kHz, other frequencies are optional. Figure 7
Energy Sales AmbassadorWww.bzxZ.net
Replay the test frequency signal, use the frequency counter to accurately measure the output signal frequency F1, and use F. to represent the recorded signal frequency, then: Frequency Error
Note: F. is the value recorded on the test record. Test 6 discs
5.2.5.11 Phase difference between channels
Test system block diagram is as shown in Figure 9.
FL-Fo×100%
Test frequency: 20kHz, other frequencies are optional (can be preferred according to ISO/R266). Frequency counter
(5)
Replay the left and right in-phase test frequency signals of the reference recording level, and use a phase difference meter or oscilloscope to measure the phase difference between the left and right channel outputs, expressed in degrees.
Thank you for the test master
5.2.5.12 Reading time
Test system block diagram is as shown in Figure 10.
Load the test record into the CD player and wait until the loading system enters the playback position. Short reading time
Phase meter
In the playback preparation state, press the adjacent track playback button and use the stopwatch to measure the time it takes for the signal at the beginning of the selected track to be played back (inner circle).
Long read time
After the first part of the test record starts to be played back, press the last track playback button immediately and use the stopwatch to measure the time until the signal at the beginning of the last track is played back 10
.
GB/T15860—1995
c. Read time to the next record (multi-disc player) During the playback of the record, after pressing the button to play the next record, use the stopwatch to measure the time until the track of the selected next record starts to be played.
Measure more than 10 times and take the average value.
5.2.5.13 Level nonlinearity
The block diagram of the test system is shown in Figure 11.
The test signal frequency is 1kHz. The given recording level is from 0 to -90dB, decreasing by 10dB, or by other steps. For all given test signals from 0 to -90dB, use a level meter or spectrum analyzer to measure the output level with the reference output voltage as 0dB, and calculate the difference between the output level measured by the two channels and the given recording level. CL machine
5.2.5.14 Maximum power consumption
Question Xu Yuwei
When the CD player works under the maximum voltage and load conditions, use an ammeter to measure the effective value of the current obtained from the power supply (1), then: the maximum power consumption is =1×Umax
For ac power supply, the measurement result is expressed in VA, and for dc power supply, the measurement result is expressed in W. 5.3 Safety test method
Perform according to the method specified in GB8898.
5.4 Electromagnetic compatibility test method
5.4.1 Interference characteristic test method
According to the provisions of GB13837.
5.4.2 Conducted immunity test method
According to the provisions of GB9383.
5.5 Environmental test method
5.5.1 The prototype should be inspected after unpacking, and its appearance, structure and function should be free of minor or major defects. 5.5.2 Test sequence
(6)
Environmental tests include climatic tests and mechanical tests. All tests should be carried out on the same prototype. The test items and sequence are as follows: high temperature load test,
high temperature storage test;
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