Jun,04

IEC 62121-2001 pdf – Methods of measurement for minidisc recorders/players

IEC 62121-2001 pdf – Methods of measurement for minidisc recorders/players

IEC 62121-2001 pdf – Methods of measurement for minidisc recorders/players.
1 Scope and object This International Standard specifies the measuring methods for recording and reproducing equipment for MiniDiscs that conform to the specifications of IEC 61909. NOTE 1 For convenience, this recording and reproducing equipment will be referred to as “MD recorder” hereinafter. The reproducing part of this equipment or equipment with only a reproducing function will be referred to as “MD player” throughout the text of this standard. If there is no risk of misunderstanding, the term “MD recorder” will be generally used. NOTE 2 This standard does not include specifications for listening tests (see IEC 60268-13). The object of this standard is to list and define the characteristics affecting the performance of MiniDisc recorders or players, to establish conditions and methods of measurement of those characteristics, and to standardize the presentation of the results. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60065:1998, Audio,video and similar electronic apparatus – Safety requirements IEC 60068-2-27:1987, Environmental testing – Part 2: Test – Test Ea and guidance: Shock IEC/TR 60268-13:1998, Sound system equipment – Part 13: Listening tests on loudspeakers IEC 60651:1979, Sound level meters
ISO 1996 (toutes les parties), Acoustique – Caractérisation et mesurage du bruit de l’environ- nement ISO 3740:1980, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit – Guide pour l’utilisation des normes fondamentales et pour la préparation des codes d’essais relatifs au bruit ISO 3741:1999, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique – Méthodes de laboratoire en salles réverbérantes (disponible en anglais seulement) ISO 3743-1:1994, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit – Méthodes d’expertise en champ réverbéré applicables aux petites sources transportables – Partie 1: Méthode par comparaison en salle d’essai à parois dures ISO 3743-2:1994, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique – Méthodes d’expertise en champ réverbéré applicables aux petites sources transportables – Partie 2: Méthodes en salle d’essai réverbérante spéciale ISO 3744:1994, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit à partir de la pression acoustique – Méthode d’expertise dans des conditions approchant celles du champ libre sur plan réfléchissant ISO 3745:1977, Acoustique – Détermination des niveaux de puissance acoustique émis par les sources de bruit – Méthodes de laboratoire pour les salles anéchoïque et semi-anéchoïque
ISO 1996 (all parts), Acoustics – Description and measurement of environmental noise ISO 3740:1980, Acoustics – Determination of sound power levels of noise sources – Guidelines for the use of basic standards and for the preparation of noise test codes ISO 3741:1999, Acoustics – Determination of sound power levels of noise sources – Precision methods for broad band sources in reverberation rooms ISO 3743-1:1994, Acoustics – Determination of sound power levels of noise sources – Engineering methods for small, movable sources in reverberation fields – Part 1: Comparison method for hard walled test rooms ISO 3743-2:1994, Acoustics – Determination of sound power levels of noise sources using sound pressure – Engineering methods for small, movable sources in reverberant fields – Part 2: Methods for special reverberation test rooms ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using sound pressure – Engineering method in an essentially free field over a reflecting plane. ISO 3745:1977, Acoustics – Determination of sound power levels of noise sources – Precision methods for anechoic and semi anechoic rooms 3 Terms and definitions For the purpose of this International Standard, the terms and definitions given in the relevant clauses pertaining to measurement (see clauses 6 and 7) and the following definitions apply. 3.1 meaning of the expression “designated xxxxx” the item or value that is designated by a manufacturer based on the reference item or value EXAMPLE: Designated recording level: This is the recording level designated by a manufacturer based on the reference recording level which is indicated on an attached level meter

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