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8f04872cad04a6a13d67604de4d851c3 | 103 461 | 5.8 Analogue radio requirements | Products, except adapters, shall be able to receive FM analogue radio broadcasts, as described in ETSI ETS 300 384 [5], in the frequency range 87,5 MHz to 107,9 MHz. |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 5.9 Retuning | Products which store a list of services/service components shall provide a "band scan" user function which scans the whole of the tuning range and updates the stored list when required. This feature shall be initiated by the press of a single button on the device, or, if it is a feature in a menu structure, it shall be... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 5.10 Text display | Products shall have a means of displaying text to the user. The text display shall display the name of the audio components available for selection. Products shall display the complete label whenever possible. The label shall only be reduced in length by applying the character selection provided in the flag field of th... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.1 Introduction | The minimum requirements for in-vehicle digital radio receivers are set out in this clause 6. Domestic digital radio receivers are the subject of clause 5. In-vehicle products are those products designed specifically for use within a vehicle. In-vehicle products comprise many types of receiver, including those integrat... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.2 Frequency range | Products shall be capable of receiving DAB and DAB+ digital radio broadcasts in the frequency range 174 MHz to 240 MHz. The required centre frequencies of the transmitted signals are specified in annex E. |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.3 Antenna connection | An antenna connection with input impedance of 50 Ohms is required. |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.4 Gaussian sensitivity | Products shall provide adequate audio reception with an input power level of -97,7 dBm when fed by a DAB signal with Gaussian transmission channel characteristics. Products sold with a packaged antenna shall provide adequate audio reception of a DAB signal with Gaussian transmission channel characteristics with field s... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.5 Rayleigh sensitivity | Receivers shall provide adequate audio reception with an input power level of -92,2 dBm when fed by a DAB signal with Rayleigh transmission channel characteristics. Products sold with a packaged antenna shall provide adequate audio reception of a DAB signal with Rayleigh transmission channel characteristics with field ... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.6 Receiver selectivity (adjacent channel interference) | Products shall provide adequate audio reception in the presence of interfering DAB signals at specified levels on other frequencies. The wanted signal shall be a DAB signal at a level of -70 dBm. The interfering signal shall be a DAB signal with a frequency offset and amplitude as described in table 2. Products shall a... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.7 DAB and DAB+ channel decoding | Products shall be able to decode one audio sub-channel. NOTE: Products may decode additional audio sub-channels. Products shall be able to decode a DAB audio component contained in a sub-channel of a size up to and including 208 Capacity Units. Products shall be able to decode a DAB+ audio component contained in a sub-... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.8 Analogue radio requirements | Products, except adapters, shall be able to receive FM analogue radio broadcasts, as described in ETSI ETS 300 384 [5], in the frequency range 87,5 MHz to 107,9 MHz. |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.9 Retuning | Products which store a list of services/service components shall provide a "band scan" user function which scans the whole of the tuning range and updates the stored list when required. This feature shall be initiated by the press of a single button on the device, or, if it is a feature in a menu structure, it shall be... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.10 Text display | Products shall have a means of displaying text to the user. The text display shall display the name of the audio components available for selection. Products shall display the complete label whenever possible. The label shall only be reduced in length by applying the character selection provided in the flag field of th... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.11 Announcement signalling and switching | Products shall support announcement switching as defined in ETSI EN 300 401 [1], clause 8.1.6.2 (i.e. same ensemble only). This feature instructs the receiver to select an alternative audio source only for the duration of an audio announcement, before returning to the original source. NOTE: Manufacturers may provide th... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 6.12 Service following | Products shall support service following to ensure that the user is always provided with the best audio experience. Ensembles on different frequencies (MFNs), services on multiple ensembles, hard linking to DAB and FM-RDS alternatives, including implicit linking and the "dead link" mechanism, and soft linking shall be ... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7 Test specification for core technology | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.1 Introduction | Clause 7 provides descriptions for the testing that provides evidence that the core technology meets the Minimum Requirements set out in clauses 5 and 6. Product Core Technology All other components • Tuner / Decoder • Functional & Non-Radio parts • User Interface Responses • Radio Performance Figure 2: Place of core t... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.2 Basic checks | In order to perform the technology core testing, the basic interfaces of the DUT shall be checked first. The testing in this clause ensures that the controls, display device and audio device are working, and that the selection mechanism delivers the right audio stream to the audio output. Figure 3: Test set up with one... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.3 Audio testing | The testing in this clause ensures that the DUT is able to decode DAB audio and DAB+ audio with various channel coding and audio coding parameters. Not all possible permutations are tested, but the DUT needs to be able to handle all situations that may occur. The tests are performed in transmission mode I using a condu... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.4 Character sets | The testing in this clause ensures that the DUT is able to handle all character set decoding correctly. The minimum character support is for all characters in the Complete EBU Latin-based repertoire, see ETSI TS 101 756 [2], annex C, encoded using all three settings of the Charset field in FIG type 1 labels. The tests ... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5 R.F. performance | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.1 DAB test signal configuration | The testing in this clause ensures that the DUT has the required R.F. performance. The majority of the test methods require the generation of DAB signals in accordance with table 10. The measurements can be made with either an audio signal (OOI method) or a bit-stream (BER method). Table 10: DAB test signal configurati... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.2 Gaussian sensitivity | The Gaussian sensitivity measurement set up is given in figure 5. Figure 5: Conducted test set up for Gaussian sensitivity For each of the 38 centre frequencies given in annex E, the following test method shall be followed: 1) The baseband encoder is set up with the DAB signal required for either the OOI or BER measure... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.3 Gaussian sensitivity - audio test | The Gaussian sensitivity measurement set up given in figure 5 shall be used. Table 11: DAB audio test signal configuration, measurement device and required result DAB signal Measurement device Required result "OOI Music" audio service: Royalty free music, Audio coding: stereo, DAB audio Monitor audio output of device u... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.4 Rayleigh sensitivity | The Rayleigh sensitivity measurement set up is given in figure 6. Figure 6: Conducted test set up for Rayleigh sensitivity For each of the channel models given in table 12, the following test method shall be followed: 1) The baseband encoder is set up with the DAB signal required for either the OOI or BER measurement a... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.5 Adjacent channel selectivity | The adjacent channel selectivity measurement set up is given in figure 7. Figure 7: Conducted test set up for adjacent channel selectivity The test shall be performed with the interferer frequency set to each of the three upper and lower adjacent channels, as given in table 13. NOTE: The frequency of the interferer cha... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.6 Extended adjacent channel selectivity | The adjacent channel selectivity measurement set up given in figure 7 shall be used. The test shall be performed with the interferer frequency set to the centre frequency of each DAB channel (see annex E) except the three lower and three upper adjacent channels and the wanted frequency. The power offset shall be +45 dB... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.5.7 Power variation adjacent channel selectivity | The adjacent channel selectivity measurement set up given in figure 7 shall be used. The test shall be performed with the wanted frequency set to channel 12 B and the interferer frequency set first to channel 12A and then to channel 12C. The wanted power level shall be -90 dBm for the low power test and -50 dBm for the... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.6 Reconfigurations | The testing in this clause ensures that the DUT is able to handle reconfigurations correctly. The tests are performed in transmission mode I using a conducted method. The test setup is shown in figure 3. Any band III channel may be used. The signal level shall be set to -70 dBm. The tests specified in tables 15 to 21 s... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.7 Service list handling | The testing in this clause ensures that the DUT is able to acquire ensembles and services in different circumstances and manage the service list correctly. ETSI ETSI TS 103 461 V1.1.1 (2017-08) 33 Figure 8: Test set up with two signal generators The tests are performed in transmission mode I using a conducted method. T... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.8 Domestic core technology | The testing in this clause ensures that the DUT is able to handle dynamic label decoding and presentation correctly and store the best available frequency in an MFN. Core technology designed exclusively for in-vehicle products is not required to pass the tests in clause 7.8. However, any core technology supporting dyna... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 7.9 In-vehicle core technology | The testing in this clause ensures that the DUT is able to correctly deal with service following and announcements. Core technology designed exclusively for domestic products is not required to pass the tests specified in clause 7.9. The tests are performed in transmission mode I using a conducted method. The test setu... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8 Test Specification for Products | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.1 Introduction | Clause 8 provides high level descriptions for the testing that provides evidence that the product meets the Minimum Requirements set out in clauses 5 and 6. Product Core Technology All other components • Tuner / Decoder • Functional & Non-Radio parts • User Interface Responses • Radio Performance Figure 9: Place of all... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.2 Applicability of the tests | All types of receivers are required to pass the user interface responses tests described in clause 8.3. The testing consists of four tests, the aims of which are: • To ensure that the receiver can tune to an ensemble and play an audio service. • To ensure that the receiver can correctly add services from another ensemb... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3 Product test for the user interface responses | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.1 Introduction | This method description forms part of the Product test for the user interface responses. Product Core Technology All other components • Tuner / Decoder • Functional & Non-Radio parts • User Interface Responses • Radio Performance Figure 10: Place of user interface responses testing in overall scheme |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.2 User Interface tests | The testing consists of four tests, the aims of which are: • To ensure that the DUT can tune to, and identify an ensemble in Band-III, and play an audio service. • To ensure that the DUT can correctly add another ensemble in Band-III to the service list. • To ensure that the user interface for scanning meets the Minimu... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.3 Test 1 - Scan add new services | • Objective: - To prove that the DUT can discover and show all DAB and DAB+ audio services in an ensemble and that the method for initiating the band scan meets the Minimum Requirements. • Method: - Setup the baseband encoder and play stream PRODUCT-STREAM-01_V1.0.eti. - Set the signal generator to an unused DAB channe... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.4 Test 2 - Play audio and view label for audio service | • Objective: - To ensure that the DUT can select a service, play out the audio and that the label for the audio playing is correct. • Method: - Select "OOI Music" from the service list. - Listen for audio. ETSI ETSI TS 103 461 V1.1.1 (2017-08) 48 - Leave the DUT switched on. • Required result: - Audio is played out as ... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.5 Test 3 - Dynamic label is displayed and displayed correctly | In-vehicle receivers are not required to pass this test. • Objective: - To ensure that the DUT can display a dynamic label and in doing so prove that the control codes are correctly handled by the receiver. • Method: - Display the dynamic label; - Compare the dynamic label displayed to the examples shown below: EXAMPLE... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.6 Test 4 - Scan and add another ensemble | • Objective: - To ensure that the DUT can discover another ensemble and show these new services in the service list. • Method: - Turn off the DUT; - Turn off the signal generator; - Setup the baseband encoder and play stream PRODUCT-STREAM-02_V1.0.eti; - Set the signal generator to a different unused DAB channel and th... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.3.7 Test 5 - Select and play FM services | Adapter products are not required to pass this test. • Objective: - To prove that the DUT can select and play FM services. ETSI ETSI TS 103 461 V1.1.1 (2017-08) 53 • Method: - Select 3 FM services in the location where testing is taking place and tune to each and listen. • Required results: - The audio plays for 15 sec... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4 Product test for radio performance | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.1 Introduction | This method description forms part of the Product test for radio performance. Product Core Technology All other components • Tuner / Decoder • Functional & Non-Radio parts • User Interface Responses • Radio Performance Figure 11: Place of radio performance testing in overall scheme This method description forms part of... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.2 Standard test conditions | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.2.1 Environmental | • Ambient Temperature 15 °C to 35 °C • Relative Humidity 25 % to 75 % • Atmospheric pressure 86 kPa to 106 kPa • Mains Voltage (EU) 230 V RMS ± 10 % 50 Hz ± 6 % • Mains Voltage (Non-EU) According to laboratory norms ETSI ETSI TS 103 461 V1.1.1 (2017-08) 54 |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.2.2 The OOI test | Products will typically not provide a means to determine the BER and therefore a test method is specified which allows the audio output of the product to be used to determine the radio performance. The success / failure criterion is the quality of an audio tone delivered by the product, when supplied with a specificall... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.3 RF test frequencies, pass / fail limits | The pass / fail limits are derived from: 1) The Minimum Requirements set out in clauses 5 and 6; 2) A correction factor of -1,1 dBm to take account of the difference between the BER of 10-4 and the point at which the test signal ceases to provide clean tone; 3) Measurement uncertainties. The test facility will identify... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.4 Method for conducted sensitivity test | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.4.1 Initial conditions- measurement uncertainty calculation | In order to maximize measurement accuracy and repeatability certain test conditions are stipulated and shall be adhered to. ETSI ETSI TS 103 461 V1.1.1 (2017-08) 55 The Uncertainty Value, U.V. (for the whole process, including power level and OOI test) will be established by the test facility and if < 0,4 dB, used to c... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.4.2 Empirical method - 1 kHz tone, DAB+ audio, EEP-3A | Figure 12: Conducted test set up for domestic and in-vehicle receivers 1) The measurement set-up is given in figure 12 for the purpose of explanation of method. 2) The signal generator shall be connected to the RF input of the receiver under test. 3) The acoustic output shall be monitored through speakers or headphones... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.4.3 Empirical method - music stream, DAB audio, UEP-3 | 1) The measurement set-up is given in figure 12 for the purpose of explanation of method. 2) The signal generator shall be connected to the RF input of the receiver under test. 3) The acoustic output shall be monitored through speakers or headphones connected to the receiver. 4) Using table C.3, set the generator frequ... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.5 Method for radiated sensitivity test | |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.5.1 Initial conditions - measurement uncertainty calculation | In order to maximize measurement accuracy and repeatability certain test conditions are stipulated and shall be adhered to. The Uncertainty Value - U.V. (for the whole process, including field strength and OOI test) will be established by the test facility and if < 4 dB, used to calculate the dBµV/m in column C of tabl... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.5.2 Empirical method - 1 kHz tone, DAB+ audio, EEP-3A | In order to obtain the required test accuracy and repeatability, this method is to be used in test facilities meeting the standards required for receiver testing and free field, radiated electromagnetic wave conditions. A G-TEM cell with sufficiently large internal dimensions shall be used for the radiated test. The di... |
8f04872cad04a6a13d67604de4d851c3 | 103 461 | 8.4.5.3 Empirical method - music stream, DAB audio, UEP-3 | 1) The measurement set-up is given in figure 13 for G-TEM cell and in figure 14 for FAR/SAR. 2) The signal generator shall be connected to the RF input of the chamber. 3) The audio level from the speaker should be controlled to achieve a 75dBA SPL at 30 cm distance. The acoustic output shall be monitored through the so... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 1 Scope | The present document provides technical requirements for cable CPE with integrated radio and non-radio interfaces in support of Harmonised Standards for the essential requirements of article 3.1b of the Radio Equipment Directive 2014/53/EU [i.1]. Cable equipment comprises integrated non-radio and radio network interfac... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 2 References | |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 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... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 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... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 3 Definitions and abbreviations | |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: Bluetooth™ system: equipment in compliance with Bluetooth™ specification NOTE: BluetoothTM is an example of a suitable product available commercially. This information is given for the convenience of users of the present document and d... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 3.2 Abbreviations | For the purposes of the present document, the following abbreviations apply: BER Bit Error Rate C/I Carrier to Interference C/N Carrier to Noise CENELEC European Committee for Electrotechnical Standardisation CMCI Cable Modem to CPE Interface CPE Customer Premises Equipment DECT Digital European Cordless Telecommunicat... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 4 Overview of Types of Cable Equipment | There are two categories of equipment to consider: • Cable Modem Equipment supporting DOCSIS® for data and telephony services • Cable Receiver Equipment either PAL & SECAM video analogue services or DVB-C video digital services Within the present document these two categories of equipment are covered. There may be seve... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 5 Relevant Receiver and Transmitter Parameters | |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 5.1 Non-radio function | The cable equipment's non-radio functions are its cable RF based on the DOCSIS® and DVB-C signals when delivering data and video services respectively to CPE. The present document only refers to the relevant receiver and transmitter parameters that apply to current cable equipment. Adding new receiver and transmitter p... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 6 Primary and Secondary network interfaces | |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 6.1 General | The cable equipment's primary network interface is its Cable RF function, the non-radio interface. Since a wireless LAN IEEE 802.11 [3] network interface is integrated then the compete radio equipment is termed as being a radio equipment under Directive 2014/53/EU [i.1]. ETSI ETSI TS 103 429 V1.1.1 (2016-07) 13 Its wir... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7 Test and Measurements | |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7.1 Introduction | For the purpose of the cable equipment within the scope of the present document, the test conditions of ETSI EN 301 489-1 [6], clause 4 together with ETSI EN 301 489-17 [7] for the wireless LAN IEEE 802.11 function applies. |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7.2 Test configuration | When carrying out the emissions and immunity tests to the radio function the test should follow the requirements of ETSI EN 301 489-1 [6] and for the wireless function operating at the frequency bands 2,4 GHz and 5 GHz as declared to be supported by the manufacture, it shall follow the tests as defined in ETSI EN 301 4... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7.3.1 General | When a radio wireless LAN IEEE 802.11 [3] is integrated into the cable equipment, measurements of its radio function shall be carried out with the non-radio function (cable RF) active such that it is transmitting and receiving signals within its minimum and maximum transmitter parameter limits as specified in clause 5 ... |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7.3.2 Emission Measurements | During emission measurements the radio transmitter shall be in both idle and transmit modes. The following shall be taken into account: • Harmonics and spurious disturbances associated with the wanted transmit signal, shall be ignored. • Emission in the exclusion bands shall be ignored. |
ddf71ac362bc6e516a00f93cc05c9e12 | 103 429 | 7.3.3 Immunity Measurements | During immunity measurements the radio transmitter shall be in both idle and transmit modes. The transmitter shall operate as intended within specifications defined for its use. The following shall be taken into account: • For the radio function, the immunity criteria defined in ETSI EN 301 489-17 [7] for the wireless ... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 1 Scope | The present document defines an extension to the AC-4 codec. The present document specifies a consumer object-based audio renderer for use with the AC-4 codec as specified in ETSI TS 103 190-2 [1], and the object-based audio metadata specified therein. The renderer takes the object audio essence and the corresponding m... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 2 References | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 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 reference document (including any amendments) applies. Referenced documents that ar... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 2.2 Informative References | References are either specific (identified by date of publication and/or edition number or version number) or nonspecific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks inc... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 3 Definitions, symbols, abbreviations and conventions | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: bitstream: sequence of bits channel: audio signal intended for playback by one of a set of dedicated loudspeakers with predetermined locations, e.g. Left, Right, and Centre channels codec: system that consists of an encoder and a decod... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 3.2 Symbols | For the purposes of the present document, the following symbols apply: a; b a list of individual values a and b a; b a closed interval between a and b values x; y; z a three-dimensional vector, used for specifying a position inside the room |a| the absolute value of a |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: AC Audio Codec LFE Low-Frequency Effects PCM Pulse Code Modulation ETSI ETSI TS 103 448 V1.1.1 (2016-09) 9 |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 3.4 Conventions | Unless otherwise stated, the following conventions are used in the present document. Typographic convention: Italic font denotes variables and metadata items (n is a variable or a metadata item). Function prototypes can take scalars, vectors, or matrices as arguments and operate element-wise. The return type is either ... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4 System overview | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.1 Architecture | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.1.1 Introduction | The rendering process consists of the following stages: 1) Metadata pre-processing. 2) Source panning. 3) Trimming. 4) Gain mixing. 5) Ramp mixing. Figure 1 |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.1.2 Requirements | The renderer signal processing order shall be as specified in table 1. ETSI ETSI TS 103 448 V1.1.1 (2016-09) 11 Table 1: Renderer signal processing Order Processing block Inputs Outputs 1 Metadata preprocessing (clause 5.1) Metadata input (clause 4.2.2) Playback parameters (clause 4.2.3) Output loudspeaker configuratio... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.2 Input | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.2.1 Audio | The audio interface accepts an object audio essence to be rendered to the output loudspeaker layout. The renderer shall provide an interface for one object audio essence with a length of frame_size samples. |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.2.2 Metadata | Metadata listed in this clause are transmitted to the renderer in the AC-4 bitstream. The metadata interface accepts timing metadata and num_obj_info_blocks timed updates of the object metadata. The renderer shall provide an interface for the metadata as specified in table 2. ETSI ETSI TS 103 448 V1.1.1 (2016-09) 12 Ta... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.2.3 Playback parameters | The playback parameters listed in this clause are set by the playback device to configure the rendering process. The renderer shall provide an interface for the playback parameters as listed in table 3. Table 3: Playback parameters Parameter Range Type Description output_speaker_config 0; 8 integer set output loudspe... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 4.3 Output | The audio interface provides a loudspeaker feed audio signal for each loudspeaker of the output loudspeaker configuration. The renderer shall provide an interface for num_speakers loudspeaker feeds, where each loudspeaker feed is a sequence of PCM audio samples with a length of frame_size samples. NOTE: The num_speaker... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5 Functional overview | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1 Metadata pre-processing | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1.1 Processing order | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1.1.1 Introduction | To create a deterministic rendering result, the incoming metadata is pre-processed in a specific order. The output of a metadata pre-processor block may be directed to the input of the following block. Figure 2 shows inputs and outputs of each metadata pre-processor block. ETSI ETSI TS 103 448 V1.1.1 (2016-09) 14 Figur... |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1.1.2 Requirements | The metadata shall be pre-processed in the following order: 1) Screen-anchored coordinates 2) Zone constraints 3) Snap |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1.2 Screen-anchored coordinates | |
b5b05b02fba36b97227fe9de42765664 | 103 448 | 5.1.2.1 Introduction | In consumer playback environments, the position of the Left and Right loudspeakers can vary greatly with respect to the edges of the playback screen. At one extreme, the distance between the Left and Right loudspeakers can be much wider than the screen; at the other extreme, the screen can be very large, such that Left... |
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