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GB/T 2018-2011Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape (English PDF)

磁带录音机测量方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 30, 2011

Implementation date

May 1, 2012

Scope

GB/T 2018-2011 is the English-translated version of 磁带录音机测量方法.

GB/T 2018-2011 fixes the methods for measuring the characteristics of magnetic tape sound recording and reproducing equipment.

Clause 1 states that it applies to reel tape recorders using 6.30 mm tape and to cassette tape recorders and players using 3.81 mm tape, and expressly excludes special recorders such as modulation-type recorders and high-speed duplicators.

Its contents list names Test conditions, Measurements and a normative Appendix A on the technical requirements for test tapes, that annex covering the reference tape requirements, the mechanical requirements for the cassette and the basic parameters of the test tape.

The measurement clause runs to twenty-five items, among them tape speed error, jitter rate, start-up time, rewind time, stop time after rewind or playback, mechanical noise, playback-channel and overall-channel frequency response, playback-channel and overall-channel signal-to-noise ratio, playback-channel harmonic distortion, playback distortion, overall-channel harmonic distortion, crosstalk, channel isolation, stereo channel amplitude and phase balance, maximum and minimum input level, maximum output level, input and output impedance, continuous operating time and maximum power consumption.

Clause 3 takes its terms from GB/T 2900.75 and GB/T 2900.76 and adds its own, defining rewind time, the magnetic track with a note on two-track and four-track recording, flux level and flux density as the flux per unit track width, the reference flux density chosen as the 0 dB point when the electro-acoustic performance of a recorder is tested, and channel isolation as the decibel ratio between the unwanted voltage appearing at the output of one channel and the useful signal voltage at the output of the channel actually driven.

The foreword records that compared with the previous edition a foreword was added, the definitions were reduced, the requirements for test equipment were simplified, and the definition and the measurement of playback distortion were added.

It cites GB/T 2900.75-2008 and GB/T 2900.76-2008 on electrotechnical terminology, GB/T 3240 on frequencies commonly used in acoustic measurement, GB/T 3785.1-2010 on sound level meters and GB/T 9029 on measuring jitter, was proposed by the Ministry of Industry and Information Technology and is administered by SAC/TC242, under ICS 33.160.30 and Chinese standard class M71.

It replaces GB/T 2018-1987, was issued on 2011-12-30 and has applied since 2012-05-01.

Found what you need?

Document preview — GB/T 2018-2011

National Standard of the People's Republic of China

ICS: 33.160.30
Classification: M 71
Replacing: GB/T 2018-1987

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Measurement
5.13 tape speed error
5.2 jitter rate
5.3 start-up time
5.4 rewind time
5.5 rewind (or playback) Stop time
5.6 mechanical noise
5.7 channel playback frequency response
5.8 full channel frequency response
5.9 channel playback SNR
5.105 full channel SNR
5.116 playback channels harmonic distortion
5.13 Full harmonic distortion channel
5.14 Crosstalk
5.157 channel isolation
5.168 stereo channel amplitude balance
5.178 stereo channel phase balance
5.18 muffling effect
5.19 Maximum input level
5.20 Minimum input level
5.21 maximum output level
5.24 continuous working time
5.25 Maximum power consumption
Appendix A (normative) Test with the technical requirements
A.1 with the requirements of the reference
A.2 the mechanical properties of the tape cartridge of claim 11,
A.3 The basic parameters of the test strip

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules.

This standard replaces GB/T 2018-1987 "method of measuring tape recorder." This standard and GB/T 2018-1987 compared to the main changes are as follows.

--- Increasing the foreword;

--- Reducing the definition, see Chapter 3;

--- Streamlined test equipment requirements, see Chapter 4;

--- Increase the playback distortion definition, 3.12;

--- Increased measurement of playback distortion, 5.12.

The standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China.

1 Scope

This standard specifies the bandwidth of 6.30mm disc magnetic tape and cassette tape recorder and player of the measurement methods of 3.81mm.

This standard applies to bandwidth 6.30mm disc and cassette tape magnetic recorder of 3.81mm. This standard does not apply to special Special tape recorder, such as modulation recorders and high-speed copying machines.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 2900.75-2008 Electrotechnical terminology of digital audio and video recordings

GB/T 2900.76-2008 Electrotechnical terminology audio and video recording and playback

GB/T 3240 acoustic measurement commonly used frequency

GB/T 3785.1-2010 Electric Acoustic Sound Level Meters - Part 1: Specification

GB/T 9029 sound recording and reproducing apparatus jitter measurement method

3 Terms and Definitions

GB/T 2900.75 and GB/T 2900.76 define the following terms and definitions apply to this document.

3.1 Rewind time

After a predetermined length of the tape down through time.

3.2 Magnetic track

Strip portion of the recording signal on a magnetic tape.

Note: The length of the tape recorded in the direction parallel to the two tracks called double tracks, recorded four tracks called four tracks, the rest on.

3.3 Flux level

Magnetic flux density flux density

The track width of the unit with flux.

3.4 Reference flux density

Selected as the reference point when the magnetic tape recorder were flat electro-acoustic performance testing, test as 0dB.

3.5 Channel isolation

U'B than useless voltage of channel A useful signal at its output voltage UA Channel A and Channel B at the output of produce to Decibel (dB) representation.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

GB/T 15860-2011General specification for compact disc players

Similar standards

GB/T 12841-2000|GB/T 12840-1996|GB/T 10240-2026|GB/T 4959-2026|GB/T 14474-2024|GB/T 14475-2024

Editions of GB/T 2018

Edition	Title	Revision	Status
GB/T 2018-2011	Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape	current edition	Current
GB/T 2018-1987	Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape	previous edition	Superseded

This page sells the current edition, GB/T 2018-2011. Earlier editions are listed for reference only.

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