Wireless microphone; Audio PMSE up to 3 GHz; Part 4: Auxiliary hearing equipment, including personal sound amplifiers and sensing systems up to 3 GHz&Nbsp; Harmonized standards covering the basic requirements of Article 3.2 of Directive 2014/53/EU; Standard EN 300 422-4 V2.1.1 Download: PDF&Nbsp&Nbsp; Standard EN 300 422-4 V2.1.1 Purpose: This document specifies the technical characteristics and measurement methods (ALD) of auxiliary hearing devices, including personal hearing aid systems, including induction systems, personal sound amplifiers, and associated accessories for ALD, such as remote controls and audio streaming devices. This document applies to devices operating on radio frequencies up to 3 GHz (as shown in Table 1) for analog, digital, and hybrid (using both analog and digital) modulation. This document covers the conditions determined in Annex A of the basic requirements of Article 3.2 of Directive 2014/53/EU [i.14]. Note 1: The frequency band of this device may vary depending on national regulations. Table 1: Radio communication service frequency band. Radio communication service frequency band transmits up to 3000 MHz and receives up to 3000 MHz. Note 2: Power limitations for different frequency bands can be found in ECC/DEC/(05) 02 [i.11]; EC SRD decisions [i.9] and [i.16]; EC Resolution 2014/641/EU [i.13]; Or CEPT/ERC/REC 70-03 [i.7], Annex 10 (or European or national regulations). Note 3: ETSI EN 301 489-9 [i.4] covers electromagnetic compatibility (EMC) requirements&Nbsp; Author: shanxuan111 https://www.bilibili.com/read/cv11912392/ Source: Bilibili
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