IEC 61938:2018 pdf download
IEC 61938:2018 pdf download.Multimedia systems – Guide to the recommended characteristics of analogue interfaces to achieve interoperability
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 luminance signal electrical signal representing the luminance of the television picture elements [SOURCE: IEC 60050-723:1 997, 723-05-56, modified – Note has been deleted.]3.2 chrominance signal electrical signal that is associated with the luminance signal to convey colour information; in practice this signal is made up of two components [SOURCE: IEC 60050-723:1 997, 723-05-57] 3.3 Y” signal VBS signal combined signal consisting of – a luminance signal; – blanking and synchronizing signals. Note 1 to entry: The Y” signal is the composite video signal (CVBS signal) without the C” signal. 3.4 colour signal C” signal chrominance signal with burst signal included, modulated on a subcarrier 3.5 composite video signal CVS signal combined signal consisting of – a luminance signal; – a colour signal. 3.6 composite video, blanking and synchronization signal CVBS signal combined signal consisting of – a luminance signal; – a colour signal; – blanking and synchronizing signals. 3.7 blanking signal signal used to control the suppression of the signal conveying picture information during certain parts of the scanning period, for example, during fly-back [SOURCE: IEC 60050-723:1 997, 723-05-37, modified – Example has been deleted.] 3.8 synchronizing signal signal used to determine the timing for the scanning processes in transmission and reception [SOURCE: IEC 60050-723:1 997, 723-05-36] 3.9 interface shared boundary between two pieces of equipment, defined by functional characteristics, common physical interconnection characteristics, signal characteristics and other characteristics, as appropriate[SOURCE: ISO/IEC 2382-9:1 995, definition 09.01 .06, modified – Definition has been adapted.] 3.1 0 minimum output voltage voltage measured across the rated load impedance of a piece of equipment, and related to a minimum input signal limited by signal-to-noise ratio 3.1 1 maximum output voltage voltage measured across the rated load impedance of a piece of equipment and related to a maximum input signal limited by non-linearity 3.1 2 rated source impedance internal impedance, stated by the manufacturer, of the source supplying the signal to the piece of equipment Note 1 to entry: Unless otherwise specified, the rated source impedance is assumed to be a constant pure resistance. Note 2 to entry: The manufacturer may also give the range of source impedances which he considers tolerable in practice. Note 3 to entry: Multiple values, or a range of values, may be specified, providing the corresponding rated (distortion-limited) output voltages and/or powers are also stated. 3.1 3 input impedance internal impedance measured between the input terminal and its corresponding return of the piece of equipment 3.1 4 rated source e.m.f. e.m.f. specified by the manufacturer which, when connected to the input terminals in series with the rated source impedance, gives rated distortion-limited output voltage across the rated load impedance at an appropriate setting of the controls 3.1 5 minimum source e.m.f. for rated output voltage e.m.f. that, when connected to the input terminals in series with the rated source impedance, gives rated output voltage across the rated load impedance with the volume control(s), if any, set for maximum gain and the tone control(s), if any, set as specified for rated conditions
