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57c6d0080ccc3fac90d906664d16a8b7 | 103 596-2 | 7.1 Authentication/authorization | Since CoAP do not introduce some session handling there are no e.g. user names, passwords or identification codes etc. to be managed. Nevertheless, CoAP messages may have some relationships to other activities using CoAP messages these mechanisms include some input of control data that could be subject security conside... |
57c6d0080ccc3fac90d906664d16a8b7 | 103 596-2 | 7.2 Encryptions | Encryption is outside the definition of the CoAP protocol definition and not considered here. Further details may be found in section 9 of IETF RFC 8323 [3]. |
57c6d0080ccc3fac90d906664d16a8b7 | 103 596-2 | 7.3 Specific protocol security considerations | CoAP specific security considerations have been already provided and discussed in section 11 of the protocol definition IETF RFC 7252 [1]. |
57c6d0080ccc3fac90d906664d16a8b7 | 103 596-2 | 8 Vulnerability Test Samples | This clause contains Test Purposes inspirited from known vulnerabilities data bases as inspiration for test cases, such as using associated weaknesses from CVE. ETSI ETSI TS 103 596-2 V1.1.1 (2021-05) 13 Sample TPs from CVEs [i.5] and [i.6] that were found in existing CoAP implementations are the following: TP Id TP_CO... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 1 Scope | The present document provides a test specification, i.e. an overall test suite structure and catalogue of test purposes for the Constrained Application Protocol (CoAP). It will be a reference base for both client-side test campaigns and server- side test campaigns addressing the conformance issues. |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 2 References | |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 3 Definition of terms, symbols and abbreviations | |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 3.1 Terms | For the purposes of the present document, the following terms apply: conformance: extent to which an implementation of a standard satisfies the requirements expressed in that standard ETSI ETSI TS 103 596-1 V1.1.1 (2021-05) 7 conformance testing: process to verify to what extent the IUT conforms to the standard content... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 3.2 Symbols | Void. |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: CoAP Constrained Application Protocol ETAG Entity Tag HTTP Hypertext Transfer Protocol IUT Implementation Under Test RST Reset SD Service Discover SUT System Under Test TDL Test Description Language TDL-TO Test Description Language - Test Obje... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4 Test Suite Structure | |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4.0 Introduction | The following two clauses describe the TSS. In the first one a CoAP server as SUT is considered and in the latter, a CoAP client as SUT is considered. As the base CoAP IETF RFC 7252 [1] contain no explicit requirements for testing, neither provide concrete conformance statements, the TPs were generated because of analy... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4.1 Server as SUT | 1) Message format: a) Support all defined method codes and understand regular and illegal or corrupted data along with them 2) Protocol features: a) Separate/Piggybacked b) Options c) Content format d) Error handling 3) Optional: a) Proxying |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4.2 Client as SUT | 1) Message format: a) Support all defined method codes and understand regular and illegal or corrupted data along with them 2) Protocol features: a) Separate/Piggybacked b) Options c) Content format d) Error handling |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4.3 TP naming convention | TPs are numbered, starting at 001, within each main scope. The main scopes are organized according to the TSS. Some TPs may not have a second level scope. ETSI ETSI TS 103 596-1 V1.1.1 (2021-05) 9 Table 1: TP identifier naming convention scheme Identifier: TP_<protocol>_<iut>_<scope>_<2nd_lvl_scope>*_<field>_<value>_<n... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 4.4 TP structure | Each TP has been written in TDL-TO and thus in a structured manner which is consistent with all other TPs. The intention of this is to make the TPs more formal. In addition, a more readable format is provided by generating tables out of the TDL-TO format. The defined structure, that has been used, is illustrated in tab... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 5 Test Purposes for CoAP Server | TP Id TP_CoAP_MessageFormat_Header_Version_001 Test Objective The IUT is responding on a correctly set version number. Reference IETF RFC 7252 [1] PICS Selection PIC_Server Initial Conditions Expected Behaviour ensure that { when { the IUT receives a request message containing version indicating value 1, msg_type indic... |
57c99bd1bf83ab8f085cb22c997552f8 | 103 596-1 | 6 Test Purposes for CoAP Client | TP Id TP_CoAP_Client_MessageFormat_Header_TokenLength_001 Test Objective Token Length 9-15 bytes are reserved SHALL NOT be sent, and SHALL be processed as a message format error. Reference IETF RFC 7252 [1] PICS Selection PIC_Client Initial Conditions Expected Behaviour ensure that { when { the IUT sends the message co... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 1 Scope | Higher Order Ambisonics (HOA) signals are able to deliver a significantly enhanced immersive sound compared to conventional stereo or 5.1 channel audio signals. However, there are some use cases where HOA signals cannot be transported because of the large number of HOA input channels. The present document provides an H... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 2 References | |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 3 Definitions and abbreviations | |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: MPEG-H Audio Stream (MHAS): self-contained stream format to transport ISO/IEC 23008-3 data MPEG-H 3DA: MPEG-H 3D Audio standard defined in ISO/IEC 23008-3 [1] to [4]. |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 3.2 Abbreviations | For the purposes of the present document, the following abbreviations apply: ACN Ambisonic Channel Number AGC Adaptive Gain Control AU Access Unit BG Background (audio channel) CRC Cyclic Redundancy Check DAW Digital Audio Workstation FG Foreground (audio channel) HDMI High-Definition Multimedia Interface HD-SDI High-D... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 4 Higher Order Ambisonics (HOA) Transport Format | |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 4.1 Introduction | Higher Order Ambisonics (HOA) signals are able to deliver a significantly enhanced immersive sound compared to conventional stereo or 5.1 channel audio signals. However, there are some use cases where HOA signals cannot be transported because of the large number of HOA input channels. One use case is mobile devices whe... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 4.2 Generic HOA Transport Format | To transport higher than 1st order HOA over the mobile device as shown in Figure 1 (a), an HOA Transport Encoder is used in the production devices, such as a microphone array or a digital audio workstation (DAW). As shown in Figure 2 (a), the HOA transport encoder encodes the input HOA of any order into the HOA transpo... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 4.3.1 Introduction | This clause defines Type 1 of the HOA Transport Format (HoaTransportType = 1) which is based on ISO/IEC 23008-3 (MPEG-H 3D Audio) [1] to [4]. ETSI ETSI TS 103 589 V1.1.1 (2018-06) 12 |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 4.3.2 HOA Transport Format defined in ISO/IEC 23008-3 | In [2], the HOA input signal is analysed and encoded into the spatial coding parameters and the directional and ambient signals. The number of signals is usually lower than the number of HOA input coefficients. The HOA Frame Creater converts the resulting HOA spatial coding parameters to the HOA payloads HOAConfig() an... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 5 HOA Transport Format Audio Stream | |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 5.1 Introduction | This clause defines an HOA Transport Format Audio Stream (HTFAS) which is a self-contained audio stream format to transport HTF data. Similar to MPEG-H 3D audio stream (MHAS), the transport mechanism uses a packetized approach [4]. Both, configuration data as well as coded payload data is embedded into separate packets... |
8e6346acf062098eaa607d39c664d9ea | 103 589 | 5.2 Syntax of HOA Transport Format Audio Stream | In Tables 21, 22 and 23, the syntax elements of HTFAS are defined. In Table 24, the corresponding semantics of HTFAS is defined. Table 21: Syntax of HOATransportFormatAudioStream() Syntax No. of bits Mnemonic HOATransportFormatAudioStream() { while (bitsAvailable() != 0) { HOATransportFormatAudioStreamPacket(); } } Tab... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 1 Scope | The present document specifies test methods and performance requirements for wireless and wired Active Noise Cancellation (ANC) devices such as headsets, earphones, headphones, hearables, and other ear worn devices (herein referred to as devices). The test methods and performance requirements cover the various function... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 2 References | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 3 Definition of terms, symbols and abbreviations | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 3.1 Terms | For the purposes of the present document, the following terms apply: earbuds: insert type headset with left and right earpieces pass-through mode: operational mode of an ANC device where external sound and self-speech are reproduced, in whole or in part, for the user |
716e21e2367d545aa23962580ff27f3a | 103 640 | 3.2 Symbols | For the purposes of the present document, the following symbols apply: dB decibel dBPa dB referenced to 1 Pascal dBV dB referenced to 1 Volt dBm0 dBV + 2,2 dB dBSPL dB referenced to sound pressure level (2e-5 Pascal) dBSPL(A) dB referenced to sound pressure level (2e-5 Pascal), A-weighted NOTE: According to IEC 61672-1... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: ANC Active Noise Cancellation ASL Active Speech Level BGN BackGround Noise DF Diffuse-Field DRP Drum Reference Point DUT Device Under Test EEP Ear canal Entry Point ES External Speech FB FullBand FFT Fast Fourier Transform HATS Head And Torso ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4 Setup requirements | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.1 Test room requirements | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.1.1 Test room size | Tests for ANC devices require an acoustically isolated test room. The test room size should meet the recommendations of ETSI TS 103 224 [6]. In addition to the recommended size range for test rooms in ETSI TS 103 224 [6], smaller sound isolating booths or boxes are also allowed. For laboratories using a sound isolating... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.1.2 Test room acoustic requirements | The test room or sound isolating booth shall have a clarity index (C80) consistent with the requirements of ETSI TS 103 224 [6], i.e. suitable rooms shall have C80 > 20 dB. Furthermore, the test room should have a noise floor less than 15 dBSPL(A) and a Noise Criteria (NC), as defined in ANSI/ASA S12.2 2019 [i.2], of N... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2 Test equipment requirements | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.1 Acoustic test equipment | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.1.1 Overview | The acoustic test equipment setup includes two artificial ear simulators for DUT mounting and signal recording and an artificial mouth simulator for speech reproduction. An artificial mouth simulator is required for tests which incorporate speech reproduction. For such tests, a Recommendation ITU-T P.58 [3] HATS shall ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.1.2 Artificial ear simulators | Eardrum recordings shall be made using a Type 4.3, Type 4.4, or Type 3.3 artificial ear defined in Recommendation ITU-T P.57 [2]. When testing insert-type earbuds, the Type 4.3 or Type 4.4 artificial ear shall be used. Test labs shall report which ear type is used for testing. If not specified otherwise, Diffuse-Field ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.1.3 Artificial mouth simulator | Speech playback shall be accomplished using a mouth simulator which meets the requirements established in Recommendation ITU-T P.58 [3], clause 6.2 and Recommendation ITU-T P.64 [4], clause 6. Furthermore, the mouth simulator shall meet the playback accuracy requirements in Table 4.2.1.3-1 (adapted from ETSI TS 126 132... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.2 Audio interface | Unless specified otherwise, the audio interface shall meet the requirements presented in Table 4.2.2-1 (adapted from ETSI TS 126 132 [7], clause 5.3). Table 4.2.2-1: Audio interface requirements Item Requirement Signal to noise ratio > 110 dB(A) Channel separation > 110 dB Measured maximum frequency 20 kHz (see note 1)... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.3 Idle noise | The end-to-end test system shall provide a minimal noise floor. This requirement is due to the need of accurately measuring low noise levels, which are present after ANC reduction or as part of the ANC device self-noise in quiet. Since the idle noise captured at the artificial ears may depend on different sources (e.g.... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.4 Diffuse background noise generation system | A setup for simulating realistic background noises in a lab-type environment is described in ETSI TS 103 224 [6]. ETSI TS 103 224 [6] contains a description of the recording arrangement for realistic background noises, a description of the setup for a loudspeaker arrangement suitable to simulate a background noise fiel... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.5 Directional sound source generation systems | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.5.1 Directional speech generation system | For the directional speech generation system, a secondary mouth simulator (standalone or included in a HATS) is placed in the vicinity of the primary test equipment. The HATS/mouth simulator shall fulfil the requirements as described in clause 4.2.1.3. For the generation of external speech signals, the secondary HATS/m... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.5.2 Directional loudspeaker system | For the directional loudspeaker system, a loudspeaker is placed with respect to the test equipment with variable horizontal distance, dh, and vertical distance, dv. Values for dh and dv are set such that the distance between the centre of the loudspeaker membrane and the centre of the primary test equipment's EEP-to-EE... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.5.3 High output loudspeaker system | For tests requiring a high output loudspeaker system (e.g. clause 5.6), the loudspeaker shall be capable of meeting the following requirements: • THD ≤ 5 % when measured at 0,1 m on axis with a 135 dBSPL sinusoidal signal at a frequency equal to 300 Hz. |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.2.6 Additional reference microphone | For certain measurements (e.g. clause 5.6), an additional reference microphone is required for test signal level calibration. The reference microphone shall meet the following requirements: • Frequency range: 20 Hz - 20 kHz (±2 dB from 125 Hz - 8 kHz) • Dynamic range upper limit: > 160 dBSPL ETSI ETSI TS 103 640 V1.4.1... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.3 DUT access interfaces | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.3.1 Access interface for analog devices | A general test setup configuration and access interface for an analog wired ANC device is shown in Figure 4.3.1-1. Figure 4.3.1-1: Test configuration for analog device Specifications on input and output characteristics of the headset access interface are defined in Recommendation ITU-T P.381 [5], clause 8.1.1.1. Furthe... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.3.2 Access interface for digital devices | The general setup configuration and access interface for a digital ANC device is described in Figure 4.3.2-1. ETSI ETSI TS 103 640 V1.4.1 (2026-04) 19 Figure 4.3.2-1: Test configuration for wireless digital device For wireless digital devices, the short-range RF interface and wireless coding blocks are kept generic her... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4 Setup of ANC device and test equipment | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4.1 General | The test room shall meet all requirements in clause 4.1. The acoustic test equipment defined in clause 4.2.1 is positioned in the centre of the test room. The equalization procedure of the background noise system described in clause 4.2 shall be conducted at this position. The ANC device is positioned following one of ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4.2 Fitting strategies | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4.2.1 Overview | The performance of ANC devices can vary according to device fitting. Therefore, different fitting strategies to reduce variability are provided in the following clauses. The test laboratory may also define its own fitting strategy, which varies from the ones described in the following clauses. In this case, the strateg... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4.2.2 Repeated measures | Measurements should be repeated five times by removing and replacing the DUT on the artificial ears in a manner corresponding to the most typical envisioned usage for the product. The average and standard deviation across these repetitions shall be reported. This fitting strategy is applicable to any ANC device, but no... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.4.2.3 Best-fit positioning | The goal of this fitting strategy is to iteratively find a single position, which provides the best-possible performance on HATS and is used for all measurements. The ANC device is positioned in a way that level difference measured at left and right ear is minimized (symmetry), and passive insertion loss is maximized. ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.5 Speech test signals | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.5.1 Overview | Several tests described in the present document require the playback of a speech signal from the mouth simulator. The following clauses provide information on these signals. Unless otherwise specified, all test signals shall be calibrated to an active speech level according to Recommendation ITU-T P.56 [9] of: • -4,7 d... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.5.2 Speech sequence with long pauses | For a speech sequence with long pauses, the four FB British English double-sentences provided in Annex C of Recommendation ITU-T P.501 [8] shall be concatenated and used. The sequence is 32 s in duration and includes eight unique sentences (two male speakers and two female speakers, each with two sentences). This signa... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.5.3 Short speech sequence | For a short speech sequence, the two-sentence, FB British English sequence defined in Annex D (clause D.2.2) of Recommendation ITU-T P.501 [8] shall be used. The sequence is 6,5 s in duration and includes two unique sentences (one male speaker and one female speaker). This signal is typically used for the evaluation of... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 4.5.4 Long speech sequence | For a long speech sequence, the uncompressed British English single-talk test sequence described in clause 7.3.2.1 of Recommendation ITU-T P.501 [8] shall be used. The sequence is 35,4 s in duration and includes twelve unique sentences (six male speakers and six female speakers). This signal is typically used for the e... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.1 Insertion loss | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.1.1 Overview | Insertion loss is a measurement (in dB) of the reduction in background noise caused by a DUT measured at the listener's eardrum. Insertion loss may be due to the physical occlusion of a device (passive), algorithmic noise reduction (active), or a combination of the two (total). Measurement methods for each of these thr... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.1.2 Total insertion loss | Purpose: The Total Insertion Loss quantifies the attenuation of an ambient sound field when using an ANC device with noise cancellation enabled. Definition: The Total Insertion Loss () is the difference between the equivalent continuous sound levels of the noise source measured at the listener's eardrum: 1) with... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.1.3 Passive insertion loss | Purpose: The Passive Insertion Loss quantifies the portion of Total Insertion Loss attributed to the physical occlusion of the user's auditory system by an ANC device (e.g. through plugging of the ear canal). Definition: The Passive Insertion Loss () is the difference between the equivalent continuous sound le... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.1.4 Active insertion loss | Purpose: The Active Insertion Loss quantifies the portion of Total Insertion Loss attributed to an ANC device's active noise cancellation. Definition: The Active Insertion Loss () is the difference between the equivalent continuous sound levels of the noise source measured at the listener's eardrum: 1) when wea... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.2 Noise loudness level reduction | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.2.1 Overview | Noise loudness level reduction is a single value perceptual measurement (in phon) of the attenuation of background noise at the listener's eardrum caused by a DUT. Noise loudness level reduction may be due to the physical occlusion of a device (passive), algorithmic noise reduction (active), or a combination of the two... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.2.2 Total noise loudness level reduction | Purpose: The Total Noise Loudness Level Reduction quantifies the reduction in loudness of an ambient noise field when using an ANC device with noise cancellation enabled. Definition: The Total Noise Loudness Level Reduction () is the difference between the ISO 532-1 [14] loudness level of the noise source measu... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.2.3 Passive noise loudness level reduction | Purpose: The Passive Noise Loudness Level Reduction quantifies the portion of Total Noise Loudness Level Reduction attributed to the physical occlusion of the user's auditory system by an ANC device (e.g. through plugging of the ear canal). Definition: The Passive Noise Loudness Level Reduction is the differ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.2.4 Active noise loudness level reduction | Purpose: The Active Noise Loudness Level Reduction quantifies the portion of Total Noise Loudness Level Reduction attributed to an ANC device's active noise cancellation. Definition: The Active Noise Loudness Level Reduction is the difference between the ISO 532-1 [14] loudness level of the noise source meas... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.3 Self-noise | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.3.1 Overview | The self-noise of an ANC-enabled device is caused by amplification of the electrical system noise floor resulting from ANC processing, which becomes audible in quiet environments. DUT self-noise is characteristically low level (nearing the threshold of audibility) and therefore requires minimal idle noise in the test e... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.3.2 Self-noise spectrum | Purpose: The Self-Noise Spectrum quantifies the noise generated by an ANC device with noise cancellation enabled. Such noise may be perceptually relevant when an ANC device is used in a quiet environment. Definition: The Self-Noise Spectrum ( ) is the diffuse-field corrected equivalent continuous A-weighted sound l... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.3.3 Self-noise loudness level | Purpose: The Self-Noise Loudness Level quantifies the loudness of noise generated by an ANC device with noise cancellation enabled. Such noise may be perceptually relevant when an ANC device is used in a quiet environment. Definition: The Self-Noise Loudness Level () is the ISO 532-1 [14] loudness level of the ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.4 Wind noise insertion gain | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.4.1 Overview | Wind noise insertion gain is a measurement (in dB) of the increase in the acoustic noise caused by a turbulent wind flow measured at the listener's eardrum when using an ANC device. Wind noise insertion gain may be caused by the interaction of the wind flow and the physical characteristics or placement of the device (p... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.4.2 Total wind noise insertion gain | Purpose: The Total Wind Noise Insertion Gain quantifies the amplification of wind noise when using an ANC device with noise cancellation enabled. Definition: The Total Wind Noise Insertion Gain ( , ) is the difference between the equivalent continuous sound levels generated by a turbulent wind flow measured at the... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.4.3 Passive wind noise insertion gain | Purpose: The Passive Wind Noise Insertion Gain quantifies the portion of Wind Noise Total Insertion Gain attributed to the physical occlusion of the user's auditory system by an ANC device (e.g. through plugging of the ear canal). Definition: The Passive Wind Noise Insertion Gain ( ,) is the difference betwee... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.4.4 Active wind noise insertion gain | Purpose: The Active Wind Noise Insertion quantifies the portion of Wind Noise Total Insertion Gain attributed an ANC device's active noise cancellation. Definition: The Active Wind Noise Insertion Gain ( ,) is the difference between the equivalent continuous sound levels generated by a turbulent wind flow meas... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.5 ANC Activation | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.5.1 Activation threshold level | Purpose: The Activation Threshold Level quantifies the input level of an ambient noise field that triggers a device's ANC functionality. This test is only relevant for devices with automatic enabling/disabling of noise cancellation. Definition: The Activation Threshold Level ( ) is the equivalent continuous sound... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.5.2 Activation time | Purpose: The Activation Time quantifies the time it takes for an ANC device to reach its nominal level of noise reduction after ANC is triggered. This test is only relevant for devices with automatic enabling/disabling of noise cancellation. Definition: The Activation Time ( ) is the time in ms required for t... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.6 Maximum linear operating point | Purpose: The purpose of the Maximum linear operating point is to quantify the maximum sound pressure level for which the Active Insertion Loss in an ANC device remains linear. Definition: The Maximum Linear Operating Point is the Sound Pressure Level (SPL) beyond which, the DUT Active Insertion Loss at 300 Hz deviates ... |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.7 Self-speech | |
716e21e2367d545aa23962580ff27f3a | 103 640 | 5.7.1 Overview | 5. |
716e21e2367d545aa23962580ff27f3a | 103 640 | 7.1 Overview | The measurements described in clause 5.7 assess the performance of the ANC device in terms of transmission of speech sounds generated by the user of the device. The transmission of self-speech to a user's own ears is characterized by multiple paths. Recommendation ITU-T P.76 [i.4] defines four such paths, three of whic... |
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