EN IEC 60098 pdf download.ANALOGUE AUDIO DISK RECORDS AND REPRODUCING EQUIPMENT
1 Scope
This document applies to analogue audio disk records and the corresponding professional and domestic reproducing equipment. It excludes amplifiers and loudspeakers, methods of measurement for which can be found in IEC 60268-3, IEC 60268-5, IEC 60268-21 and IEC 60268-22 1 . This document specifies the characteristics that are necessary to ensure compatibility between analogue audio disk records and the corresponding reproducing equipment. It also lists and defines the most important characteristics affecting the performance of reproducing equipment, and establishes agreed methods of measurement for these characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-806 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • ISO Online browsing platform: available at https://www.iso.org/obp • IEC Electropedia: available at http://www.electropedia.org/ 3.1 rated value value of a quantity used for specification purposes, established for a specified set of operating conditions of a component, device, equipment, or system Note 1 to entry: The rated value is normally the value stated by the manufacturer. [SOURCE: IEC 60050-1 51 :2001 , 1 51 -1 6-08, modified – Note 1 to entry has been added.] 3.2 terminated, adj <of a circuit or connection port> connected to a specified impedance required for correct operation or for specified test conditions Note 1 to entry: ‘Specified test conditions’ can include open-circuit and short-circuit.
4 General
4.1 Scales for graphical presentation of data Linear or logarithmic scales are recommended for graphical presentation. Linear decibel scales are equivalent to logarithmic scales. Other kinds of scale, such as double logarithmic, should be avoided. When using decibel scales, the zero reference should, if possible, be the rated value. In those cases, where each of the scales refers directly to physical units, it is recommended to avoid a combination of linear and logarithmic scales. Where quantities represented by the axes are of the same kind, it is recommended that the same unit length be used for both. Linear scales with remote zero point should be avoided as far as possible. For further information, see IEC 60263. 4.2 Scales for frequency characteristics Graphs should be drawn with frequency in Hz on the x-axis with a logarithmic scale, and the level expressed in dB on the y-axis with a linear scale. The scale ratio should be such that the length representing one decade of frequency is the same as the length representing a 25 dB or a 50 dB difference in level. The preferred length per decade is 50 mm. If the size of the graph is changed, the scale ratio should be left unaltered.
6 The groove
6.1 Direction of groove modulation The stereophonic groove shall carry two channels of information. The two channels shall be recorded in such a manner that they can be reproduced by movements of a reproducing stylus tip in two directions at 90° to each other, and at 45° to a radial line through the stylus tip and the centre of the record; these movements shall be tangential to, or lie in a plane through the stylus tip and the record centre, inclined at an angle of +5 0 20 ° anticlockwise to the normal to the record surface through the stylus tip as viewed towards the record centre (vertical tracking angle). The resulting modulation shall be optimum for reproducing styli having a rake angle of between 0° and −5° (for detail, see Figure 3).The monophonic groove shall carry one channel of information. It shall be recorded on both groove walls in such a manner that it can be reproduced by lateral movements of a stylus tip as described above. 6.2 Arrangement of stereophonic channels 6.2.1 Channel orientation The right-hand channel, as viewed by the audience, shall be recorded on the outer groove wall, the left-hand channel on the inner groove wall. 6.2.2 Channel phasing The phasing of the two recorded signals shall be suitable for reproduction on two-channel equipment so connected that movement of the reproducing stylus tip along the radial line through stylus tip and disk centre (as with a monophonic record) produces in-phase sound pressures at the left-hand and right-hand loudspeakers. 6.2.3 Channel levels The levels of the two recorded signals shall be suitable for reproduction on two-channel equipment, of identical channel gain, so connected that movement of the reproducing stylus along the radial line through the stylus tip and disk centre (as with a monophonic record) produces equal sound pressures at the left-hand and right-hand loudspeakers.
EN IEC 60098 pdf download
