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64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4 Frequency domain concealment (Phase ECU) | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4.1 Phase ECU overview | One of the advanced ECU modes is the Phase ECU and it is used for both speech signals and general audio signals. It operates by performing a time evolution of decoded signal in the frequency domain. This technique assumes that the lost frame can be represented by a limited number of sinusoidal components that are ident... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4.2 Spectral Shape | For the transient analysis the Phase ECU uses a MDCT based spectral shape and a frame energy to estimate how the signal evolves over time. The spectral shape is calculated based on the decoded MDCT coefficients. The transient analysis spectral shape consists of sub-band energy estimates where the number of sub-bands de... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4.3 Transient analysis | The transient analysis employs the spectral shapes and the frame energies to analyse how the sub-band energies are evolving over the last 26 ms in each band and to build a long-term spectral average for each band , an average that is used to adjust the scaling of the FFT synthesis bins during extended burst errors... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4.4 Fine Spectral analysis | For the first lost frame the prototype frame signal, , is used for a fine high-resolution spectral analysis: &%( ) = FFT ∙ , 0 ≤ < , 0 ≤ ≤%%& 211 Where &%( ) is complex valued, () is a hamming-rectangular window, and is the length of the FFT input which depends on the samplin... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.3.4.5 Frame reconstruction | For the reconstruction the fractional peak locations from the spectral analysis is used to create a time evolved reconstruction frame. This is done by phase adjusting the identified peaks to fit the time location of the reconstructed frame. While the exact time evolution of the sinusoids of the windowed prototype signa... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.6.4 PLC operation related to LTPF | If mem_ltpf_active=1 in the concealed frame, then ltpf_active is set to 1 if the concealment method is as defined in clause 5.6.3.2 or clause 5.6.3.3. Therefore, the Long Term Postfilter is applied on the synthesized time domain signal as described in clause 5.4.9, but with 7 being the decoded signal after MDCT syn... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.7 External rate adaptation | The LC3plus encoder may change the length of a compressed audio frame (nbytes) in a seamless manner. To enable this, the encoder receives an external command to change the compressed frame size, which is applied to the current frame and subsequent frames. The decoder determines the bit rate from the received packet siz... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.8 High-resolution audio support | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.8.1 Overview | High-resolution audio typically stands for high sampling rates , i.e. 48 kHz or 96 kHz, and high resolution and dynamic range for the audio sample, i.e. at least 24 bits per sample. The supported codec rates are therefore significantly higher compared to regular transmissions. LC3plus features a high-resolution audio ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.8.2 Changes to the algorithm in high-resolution mode | The changes to the algorithm in order to operate in high-resolution mode are: • Clause 5.2.2: the sampling rate index 5 is added for 96 kHz. • Clause 5.3.4.3: the MDCT window is replaced by a high-resolution window. The coefficients of these windows are given in clause 5.9.2 with suffix _HR. Furthermore, the parameter ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.8.3 High-Resolution mode and channel coding | When the high-resolution mode is combined with the channel coder as specified in clause A.1, the bitrate limits for the encoder are specified in terms of gross_bytes per channel. In particular, the lower bitrate limits given in Table 5.2 shall apply to gross_bytes. Furthermore, an additional upper bound of 400 gross_by... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9 Tables and constants | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.1 Band tables index | The values representing the variable () can be found under ./src/floating_point/constants.c contained in archive ts_103634v010401p0.zip which accompanies the present document. () for 2,5 ms frame duration: ACC_COEFF_PER_BAND_8_2_5ms[21] ACC_COEFF_PER_BAND_16_2_5ms[36] ACC_COEFF_PER_BAND_24_2_5ms[41] ACC_COEFF_PER... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.2 Low delay MDCT windows | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.2.1 Frame size 2,5 ms | Note that the non HR windows are a symmetric Kaiser-Bessel-Derived windows as defined in [i.14] with = 10. The values representing the variable _ can be found under ./src/floating_point/constants.c contained in archive ts_103634v010401p0.zip which accompanies the present document. Table 5.38: MDCT windows for 2... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.2.2 Frame size 5 ms | Table 5.39: MDCT windows for 5 ms _ Constant name in ./src/floating_point/constants.c _ MDCT_WINDOW_80_5ms[80] _ MDCT_WINDOW_160_5ms[160] _ MDCT_WINDOW_240_5ms[240] _ MDCT_WINDOW_320_5ms[320] _ MDCT_WINDOW_480_5ms[480] __ MDCT_HRA_WINDOW_480_5ms[480] __ MDCT_HRA_WINDOW_960_5ms[960... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.2.3 Frame size 10 ms | Table 5.40: MDCT windows for 10 ms _ Constant name in ./src/floating_point/constants.c _ MDCT_WINDOW_80[160] _ MDCT_WINDOW_160[320] _ MDCT_WINDOW_240[480] _ MDCT_WINDOW_320[640] _ MDCT_WINDOW_480[960] __ MDCT_HRA_WINDOW_480_10ms[960] _ _ MDCT_HRA_WINDOW_960_10ms[1920] ETSI ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.3 SNS quantization | Table 5.41: Tables for SNS quantization Variable in the present document Constant name in ./src/floating_point/constants.c. LFCB sns_C1[8][32] HFCB sns_C2[8][32] sns_vq_reg_adj_gains sns_vq_reg_adj_gains_fl[2] sns_vq_reg_lf_adj_gains sns_vq_reg_lf_adj_gains_fl[4] sns_vq_near_adj_gains sns_vq_near_adj_gains_fl[4] sns_vq... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.4 Temporal noise shaping | The following variables can be found under ./src/fixed_point/constants.c contained in archive ts_103634v010401p0.zip which accompanies the present document. ac_tns_order_bits[2][8] ac_tns_order_cumfreq[2][8] ac_tns_coef_bits[8][17] ac_tns_order_freq[2][8] ac_tns_coef_freq[8][17] ac_tns_coef_cumfreq[8][17] |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.5 Long term postfiltering | The values representing the variables of the long term postfilter can be found under ./src/fixed_point/constants.c contained in archive ts_103634v010401p0.zip which accompanies the present document. ETSI ETSI TS 103 634 V1.4.1 (2023-03) 101 Table 5.42: Tables for LTPF Variable in the present document Constant name in .... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 5.9.6 Spectral data | The values representing the variables of the spectral quantization can be found under ./src/fixed_point/constants.c contained in archive ts_103634v010401p0.zip which accompanies the present document. Table 5.43: Tables for spectra quantization Variable in the present document Constant name in ./src/floating_point/const... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6 Source code description | 6.1 Overview This clause gives an overview of the reference C code included in archive ts_103634v010401p0.zip which accompanies the present document. The ANSI-C codec has been verified on the following systems: • PC compatible computers with Visual C++ compiler, 32-bit builds. • PC compatible computers with: - GCC comp... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.2 Contents of the C source code | The C code is organized as follows. Table 6.1: Source code directory structure Directory Description README.txt Compile instructions, feature list, command lines src/fixed_point Project files for fixed point code src/floating_point Project files for floating point code testvec Test vector package: MD5 hashes for fix-po... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.3 File formats | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.3.1 Sound file (encoder input and decoder output) | Speech files use the Wave file format [i.3] with either 16 or 24 bits per sample. The encoder input Wave file defines the sampling frequency that will be used by the encoder. The byte order depends on the host architecture, e.g. least significant byte first on PCs. |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.3.2 Switching profile (encoder input) | The encoder program can read in a switching profile which specifies the encoding parameter that will be used for each audio frame. The profile consists of a binary file of little-endian 64-bit values, where each value represents a frame's parameter. If the switching file is shorter than the input, it will be looped fro... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.3.3 Parameter bitstream file (encoder output and decoder input) | The LC3plus software support the G.191 bit stream format [i.4] and therefore, the bit stream can be manipulated with the STL error insertion devices. For a correct decoder initialization, the encoder writes an additional configuration file which is provided to the decoder. The configuration contains information on samp... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 6.4 Test vector package | The test vector package verifies the compilation of the reference fixed-point and floating-point source code and that the resulting executables run as expected on a dedicated platform with bit exact results. This is a pre-requisite for the conformance tests (see clause 7) where an implementation under test is compared ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7 Conformance | 7.1 Overview The conformance procedure shall be applied to verify the quality of LC3plus encoder and decoder implementation. It allows testing of implementation with a non-bit-exact behaviour compared to the fix-point reference executable. Given that, also floating-point implementations can be verified. Clause 7.2 desc... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2 Test framework | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.1 Test material | A selection of nine items from the European Broadcasting Union Sound Quality Assessment Material EBU SQAM CD [7] shall be used. The material ensures testing of a wide range of LC3plus features. These items are trimmed according to Table 7.1. ETSI ETSI TS 103 634 V1.4.1 (2023-03) 104 Table 7.1: LC3plus Conformance Test ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.2 Test permutations and codec parameters | The input items in combination with the codec parameters, e.g. bit rates, sampling rates, frame sizes, are permutated in order to create a set of test conditions. These permuted test conditions are used for each test unless stated otherwise. For the channel coder tests, the parameters are in addition permutated with th... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.3 Modules under test | The conformance is applied for the following modules. Each module test creates two audio files which are further analysed by quality metrics in order to compare module under test and reference: • Encoder under Test (EuT): Items are encoded with the EuT and the Reference Encoder (ER) at all permutations and decoded with... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.4 Quality metric calculation | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.4.1 Root Mean Square | The RMS metric compares two time-domain signals and calculates its similarity in accuracy. The RMS level is calculated as follows: = 1 ( − ) 218 where Out(n) denotes output signal under test, and Ref(n) denotes the reference signals for the comparison. ETSI ETSI TS 103 634 V1.4.1 (2023-03) 105 To... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.4.2 Delta ODG value | To calculate the Objective Difference Grade (ODG) between two audio files, Recommendation ITU-R BS.1387-1 [i.11] (Advanced) implementation shall be used. The "Method for objective measurements of perceived audio quality" (BS.1387-1 Advanced) algorithm executable calculates the ODG between a coded audio file and the ref... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.4.3 Maximum Loudness Difference (MLD) | The MLD value is calculated for two decoded files for each test permutation according to [i.7]. The following steps according to Recommendation ITU-R BS.1387-1 [i.11] need to be processed first: • Filterbank (Annex 2, clause 2.2.5 of [i.11]): - subsample factor F changed to 16 for higher time resolution. • Outer and Mi... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.4.4 Thresholds | See clause 7.5. |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5 Software and tools | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.1 Gen_rate_profile | This tool can be used to create switching files: gen_rate_profile -layers A, B, C, … SWF_FILE period where A, B, C are the values which should be switched (e.g. bitrates or error protection modes), SWF_FILE is the generated switching profile and period the number of frames between switching points. NOTE: For error prot... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.2 Eid-xor | This tool can be used to introduce bit errors to a G.192 bitstream: eid-xor -bs g192 in_bs error_pattern out_bs where in_bs and out_bs are the input and output bitstreams both in the G.192 format [i.8] and error_pattern the error pattern in byte format. |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.3 flipG192 | This tool can flip a number of bits in a number of frames in a G.192 bitstream. It is provided as C source code and is used for the error protection test with a correctable number of flipped bits. It can be used as follows: flipG192 in_bs out_bs FLIPS FRAMES SEED VERBOSE where in_bs and out_bs are the input and output ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.4 G.192 bitstream format | The test implementation shall be able to read and write a bitstream in the G.192 format [i.8]. All tests within this script use this format. Each bit of the bitstream data is represented by a 16-bit word and is preceded by a synchronization word and the length word. A bit '0' is coded as the softbit '0x007F' and a bit ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.5 Note to platform-dependent conformance | To prepare the audio samples for the conformance test, it is recommended to use SoX (Sound eXchange) [i.9] for any operations on the audio samples in order to prepare them for the conformance test. SoX behaves differently on different platforms, meaning that the same resampling operation on the same file will not be bi... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.2.5.6 Reference conformance test script | The conformance test script is a Python® script that implements all test procedures mentioned within the present document. It can be used on an operating system with Python3 installed: lc3_conformance.py config.cfg [-v -w -keep] where config.cfg is the configuration file containing all operation points to be tested. Fo... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3 Conformance tests | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.1 Test groups | The LC3plus conformance tests are combined into the three groups: • Core coder tests, see clause 7.3.2 • Concealment tests, see clause 7.3.3 • Channel coder tests, see clause 7.3.4 For the LC3plus high-resolution conformance, the tests above are modified and extended according to clause 7.3.5. For testing the dedicated... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2 Core coder tests | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2.1 SQAM test | The SQAM Test aims to verify the intrinsic audio quality of an implementation under test. It uses the nine prepared test items (Table 7.1) to provide audio quality metrics in comparison to the reference implementation. Items are generated depending on the tested module according to clause 7.2.3. Quality metrics accordi... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2.2 Band limitation test | The band limitation test verifies the correct implementation of the bandwidth detector/limiter inside the LC3plus encoder and decoder. Therefore, the item Female_Speech_German from the EBU SQAM CD is resampled and low pass filtered to create the following test configurations. Table 7.2: Test Configurations for Band Lim... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2.3 Low pass test | The Low Pass Test shall verify the correct implementation of the cut-off frequency of 20 kHz used in the EuT. Therefore, the test is only relevant for sampling rates higher than 32 kHz. For this test, a signal consisting of white noise above 20 kHz is used. The energy of the output PCM file is calculated according to... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2.4 Bitrate switching test | The conformance tool shall be used for verifying the rate switching capability of the codec at runtime. It is required for the test implementation to accept a switching file instead of the bitrate parameter. The test implementation shall detect such a switching file and initialize the codec to the first bitrate from th... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.2.5 Bandwidth switching test | The conformance tool shall be used for verifying the bandwidth switching capability of the codec at runtime. It is required for the test implementation to accept a bandwidth switching file. The test implementation shall detect such a switching file. Switching files are generated using the STL gen_rate_profile tool acco... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.3 Concealment tests | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.3.1 Packet loss concealment | The PLC tests shall verify the correct implementation of the packet loss concealment. Two PLC tests shall be carried out: a test with a 10 % random error pattern and a test with a 10 % burst error pattern. These tests follow the same procedure as the SQAM decoder test and add an additional error insertion step between ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.3.2 Partial concealment | This test shall verify the correct implementation of the partial concealment. This test follows the same procedure as the packet loss concealment test (clause 7.3.3.1) and all bitstreams are in addition encoded with the channel encoder in the highest error protection mode (4). The eid-xor tool (clause 7.2.5.2) is used ... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4 Channel coder | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.1 Channel coder test for correctable frames | This test verifies the correct implementation of the channel coder together with the LC3plus core codec excluding packet loss concealment. The tests execute the SQAM test, but protected bitstreams are created, bit errors are inserted using flipG192 (clause 7.2.5.3), distorted bit streams are decoded and the wave output... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.2 Channel decoder test for non-correctable frames | This test follows the procedure from the channel coder test for correctable frames (clause 7.3.4.1) but inserts a non-correctable amount of bit errors. Formula (220) is used to calculate the number of flipped bits and 50 percent of all frames are flipped: = ∙ ∙ 24 000 220 where bitrate is the no... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.3 Error protection mode switching test | This test shall verify the correct update of all codec settings in case of error protection mode switching at runtime. It is following the same test procedure as outlined in the SQAM tests (clause 7.3.2.1) and uses an error protection mode switching file as additional parameter. The error protection mode switching file... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.4 Combined channel coding test for correctable frames | This test shall verify the correct behaviour of the combined channel coding for a stereo audio input. It follows the same test procedure as outlined in the channel encoder and decoder tests for correctable frames stated in clause 7.3.4.1. The evaluation of the audio quality within these tests is done separately for eac... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.5 Combined channel coding test for non-correctable frames | This test shall verify the correct behaviour of the combined channel coding for a stereo audio input. It follows the same test procedure as outlined in the channel encoder and decoder tests for non-correctable frames stated in clause 7.3.4.2. The evaluation of the audio quality is performed as outlined in clause 7.3.4.... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.4.6 Void | ETSI ETSI TS 103 634 V1.4.1 (2023-03) 112 |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5 High-resolution mode test | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.1 Core coder tests | For testing the high-resolution mode the following changes apply to the test procedures: • SQAM test (clause 7.3.2.1) - ODG is measured with the floating-point reference executable as DR and ER - ODG threshold shall be 0,02, except for the fallback bitrates mentioned in Table 5.2 where the ODG threshold shall be 0,06 -... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.2 Concealment tests | Changes compared to clause 7.3.3: • RMS or MLD is measured with the floating-point reference executable as DR and ER • RMS threshold shall be k = 22 |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.3 Channel coder | Changes compared to clause 7.3.4: • ODG, RMS or MLD is measured with the floating-point reference executable as DR and ER • ODG threshold shall be 0,02, except for the fallback bitrates mentioned in Table 5.2, where the ODG threshold shall be 0,06 • RMS threshold shall be k = 22 |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.4 Precision tests | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.4.1 General | The precision of an implementation under test, especially a fix-point implementation, shall be measured as outlined in the following: The measurement is carried out on pure sinusoidal signals with an amplitude of -3 dB, a precision of at least 24 bits per audio sample and a duration of one second. The sinusoidal sequen... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.4.2 Total Harmonic Distortion plus Noise | The Total Harmonic Distortion plus Noise (THD+N) value is calculated by comparing the energy of the coded output to the energy of the sinusoidal sequence after applying a notch-filter to remove the sinusoidal component. Let , = 0. . −1, denote the sequence of samples from coded_output.wav containing test signal fre... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.5.4.3 Signal to Noise Ratio | The Signal to Noise Ratio (SNR) is calculated by: SNR = 10 log ∑ ( ) ∑ ( ) −( ) , 220.4 with = and being the sequence of samples from coded_output.wav containing test signal frequency . |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.3.6 Low Frequency Effects (LFE) test | The test of the Low Frequency Effects (LFE) mode verifies the correct configuration of bandwidth detector, LTPF, TNS and noise filling on LC3plus encoder side. Therefore, a sine sweep signal with frequencies from 10 to 250 Hz is generated and the EuT is compared to the reference implementation using MLD as quality metr... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.4 Mapping conformance test, module and quality metric | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.4.1 Encoder | Table 7.4 describes the available tests for an LC3plus encoder and the applicable quality metric. ETSI ETSI TS 103 634 V1.4.1 (2023-03) 114 Table 7.4: EuT tests and metrics Test Name Metric SQAM RMS or ODG Band limitation RMS or ODG Low pass Energy Bitrate switching RMS or ODG Bandwidth switching RMS or ODG Channel cod... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.4.2 Decoder | Table 7.5 describes the available tests for an LC3plus decoder and the applicable quality metric. Table 7.5: DuT tests and metrics Test Name Metric SQAM RMS Band limitation RMS Bitrate switching RMS Packet loss concealment MLD or RMS Partial concealment MLD or RMS Channel coder correctable frame RMS Channel Coder, Non-... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.4.3 Encoder-Decoder (EncDec) | Table 7.6 describes the available tests for an LC3plus EncDec and the applicable quality metric. Table 7.6: EuT-DuT tests and metrics Test Name Metric SQAM RMS or ODG Band limitation RMS or ODG Low pass Energy Bitrate switching RMS or ODG Bandwidth switching RMS or ODG |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.5 Quality metric thresholds | The thresholds for each quality metric are outlined in Table 7.7. For each test, the conformance criteria stated in clause 7.6 apply. ETSI ETSI TS 103 634 V1.4.1 (2023-03) 115 Table 7.7: Thresholds for quality metrics Metric Threshold RMS k = 14 (see note 1) ODG 0,06 | 0,08 | 0,12 | 0,15 (see note 2) Energy 70 MLD 4 TH... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.6 Conformance criteria | A LC3plus implementation shall pass all required conformance tests to be considered as a conformant implementation. The required codec configurations and conformance test may depend on the application as described in clause 7.7.2. If not stated otherwise, all conformance tests listed in clause 7.7.1 shall be fulfilled.... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.7 Codec tests | |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.7.1 General LC3plus test | LC3plus codec parameter configurations for testing are: • All configurations listed in Table 5.1 and Table 5.2 • Channel coder enabled/disabled • Concealment enabled For a full compliant implementation, the conformance criteria in clause 7.5 for all conformance tests listed in clause 7.4 shall be fulfilled using the gi... |
64c5405618784b24a18fe0e72433f605 | 103 634 | 7.7.2 Applications | The conformance tests depend on the required application. Application test specifications may require additional tests. The application typically defines the codec configuration parameters (clause 7.2.2), i.e. bit rate, sampling rate, etc., and which conformance test groups are required for which modules (clause 7.2.3)... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 1 Scope | The present document establishes an optional extension to the broadcast standard for Digital Audio Broadcasting (DAB) system. The Filtered Information Service (FIS) is a data application that allows service providers to deliver information to groups of receivers with configurable filters, for example, text language, mo... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 2 References | |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 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... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 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... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 3 Definition of terms, symbols and abbreviations | |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 3.1 Terms | For the purposes of the present document, the terms given in ETSI EN 300 401 [1] and the following apply: display language: user defined language used for display of text elements key: unique identifier used to address receiver devices allocated to a particular company |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 3.2 Symbols | Void. |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: DAB Digital Audio Broadcasting FEC Forward Error Correction FIG Fast Information Group FIS Filtered Information Service GPS Global Positioning System HMI Human Machine Interface ISO International Organization for Standardization JFIF JPEG File... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 4 Introduction | The Filtered Information Service (FIS)is an application used to send messages to suitably equipped DAB devices via the broadcast radio network. It may be used by a radio manufacturer, car manufacturer or third-party to disseminate information to their clients. The FIS allows the information to be identified by company ... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5 Filtered Information Service data | |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.0 Introduction | A FIS consists of a set of messages, encoded as an XML file, and supporting data files, such as images, carried in an MOT carousel (see ETSI EN 301 234 [2]). The MOT carousel is transported using packet mode with additional FEC (see ETSI EN 300 401 [1]). Every file within the MOT carousel is identified with the company... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.1 FIS element | This is the root element of the FIS document and can contain zero or more of the following elements: • message. Its attributes are detailed below: Attribute Description Type Status key Company identifier for entity providing the information. xs: unsignedInt Required version Indicator for changed content; shall be incre... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.2 Message element | The message element can contain the following elements: • text • picture • validity • geolocation • filters As a minimum, one text element and one validity element shall be specified for each message. The validity element specifies the lifetime of the message in the receiver. Its attributes are detailed below: Attribut... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.3 Text element | |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.3.1 General | The text element shall contain one of each of the following elements: • language • title • body Language variants of the same message can be provided by including text elements with different language settings. Variants of the body in the same language but with different levels of detail may be provided by defining mes... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.3.2 Formatting | Some W3C HTML tags can be used to provide formatting for the title and body. Style, font and font size tags shall not be used. No font and default font size are defined for the text display due to screen resolution. The text formatting tags defined in table 1 can be used in both the title and body elements. Table 1: W3... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.3.3 Language element | The language child element defines the language for the other child elements of the parent element, that is the title and body of a text element, or the text of an opening element (see clause 5.6.3). Its attributes are detailed below: Attribute Description Type Status xml:lang Language of the child element(s) xml:lang ... |
75ab8d543d8a899a67bd2e8f4f627f5c | 103 689 | 5.3.4 Title element | This parameter provides the title of the message. It has a maximum length of 32 characters. |
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