hash stringlengths 32 32 | doc_id stringlengths 7 13 | section stringlengths 3 121 | content stringlengths 0 2.2M |
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615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.3 Void | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4 Additional metadata | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.1 reserved_data_size_bits | The reserved_data_size_bits codeword indicates the value of reserved_data_size. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 46 The reserved_data_size indicates the length of the reserved_data element plus the padding element in bytes and can be calculated by the following equation: reserved_data_size = reserved_data_size_bit... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.2 oa_element_id_idx | The oa_element_id_idx index indicates the type of the following oa_element element. Table 26 lists the type of the oa_element element, indicated by the corresponding table index. Table 26: The type of the oa_element indicated by oa_element_id_idx oa_element_id_idx Type of the oa_element element 0 reserved 1 object_elem... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.3 oa_element_size_bits | The oa_element_size_bits codeword indicates the value of oa_element_size. The oa_element_size indicates the total length in bytes of the following subsequent elements: • alternate_object_data_id_idx • b_discard_unknown_element • oa_element • padding The value of oa_element_size is determined by the following equation: ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.4 alternate_object_data_id_idx | The alternate_object_data_id_idx index indicates the type of the alternative data for the corresponding oa_element. The type of the alternative data for the corresponding oa_element element depends on the type of the oa_element element (indicated by the oa_element_id_idx element). For oa_element_id_idx = 1, table 27 li... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.5 b_discard_unknown_element | The b_discard_unknown_element flag indicates whether the intention is to discard the corresponding oa_element during a transcoding process, if the value of the oa_element_id_idx element is unknown. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.6 b_object_not_active | The b_object_not_active flag indicates whether the object's audio essence is silent. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.7 object_basic_info_status_idx | The object_basic_info_status_idx index indicates how the values of the elements contained in the object_basic_info block are determined. Table 28 lists how the values of the elements contained in the object_basic_info block shall be determined. Table 28: Values of the elements contained in the object_basic_info block o... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.8 b_object_in_bed_or_ISF | The b_object_in_bed_or_ISF helper flag shall be set if the corresponding object is contained in a bed or is an ISF object. Whether an object is contained in a bed or is and ISF object can be determined from the order of objects and from the OAMD content description, specified in clause 5.6.0. The objects are ordered in... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.9 object_render_info_status_idx | The object_render_info_status_idx index indicates how the values of the object_render_info elements are determined. Table 29 lists how the values of the elements contained in the object_render_info block shall be determined. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 48 Table 29: Values of object_render_info elements object... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.10 b_additional_table_data_exists | The b_additional_table_data_exists flag indicates whether the additional_table_data_size_bits element and the additional_table_data block follow in the bitstream. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.11 additional_table_data_size_bits | The additional_table_data_size_bits codeword indicates the value of additional_table_data_size. The value of additional_table_data_size is determined by the following equation: additional_table_data_size = additional_table_data_size_bits + 1 In this equation, the bits of the additional_table_data_size_bits element are ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.12 obj_basic_info[] | The obj_basic_info[] array indicates whether the object_gain_idx and b_default_object_priority elements are present in the bitstream. Each element of the obj_basic_info[] array is a flag that indicates that a corresponding element is present in the bitstream. Table 30 lists the correspondence between bitstream element ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.13 obj_render_info[] | The obj_render_info[] array indicates the bitstream elements contained in the object_render_info block. Each element of the obj_render_info[] array is a flag that indicates whether corresponding elements are present in the bitstream. Table 31 lists the correspondence between bitstream elements and elements of the obj_b... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.4.14 padding | The padding element is a sequence of zero bits. The number of padding bits corresponds to the size value of the block. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5 Trim | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.1 warp_mode | The warp_mode element is a codeword that indicates an object position adjustment before rendering as specified in table 32. Table 32: Object position adjustment indicated by warp_mode warp_mode Object position adjustment 0b00 No object position adjustment. 0b01 The object_position_Y value shall be multiplied by a facto... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.2 global_trim_mode | The global_trim_mode element is a codeword that indicates the trim mode as specified in table 33. The global trim mode is applicable to all trim configurations. Table 33: Global trim mode indicated by global_trim_mode global_trim_mode Global trim mode Balance control 0 default_trim Disabled 1 disable_trim Disabled 2 cu... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.3 b_default_trim | The b_default_trim flag indicates whether the trim_mode is set to default_trim for all objects in the corresponding trim configuration. NOTE: If b_disable_trim_per_obj is true, the transmitted information to disable trim for individual objects may override the setting for individual objects in the trim configuration. E... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.4 b_disable_trim | The b_disable_trim flag indicates whether the trim_mode is set to disable_trim for all objects in the corresponding trim configuration, or, if transmitted per object (by b_disable_trim_per_obj) for the corresponding object. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.5 trim_balance_presence[] | If true, the Boolean elements of this array indicates that corresponding bitstream elements for trim and/or balance processing are transmitted. Table 34 lists the correspondence between elements of trim_balance_presence[] and bitstream elements of the trim_element. Table 34: trim_balance_presence[] elements trim_balanc... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.6 trim_centre | The trim_centre codeword indicates the trim_centre value as specified in table 35. Table 35: trim_centre trim_centre trim_centre in dB 0 +6 1 +3 2 +1,5 3 +0,75 4 -0,75 5 -1,5 6 -3 7 -4,5 8 -6 9 -7,5 10 -9 11 -10,5 12 -12 13 -13,5 14 -16 15 -36 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.7 trim_surround | The trim_surround codeword indicates the trim_surround value as specified in table 36. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 51 Table 36: trim_surround trim_surround trim_surround in dB 0 - 3 reserved 4 -0,75 5 -1,5 6 -3 7 -4,5 8 -6 9 -7,5 10 -9 11 -10,5 12 -12 13 -13,5 14 -16 15 -36 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.8 trim_height | The trim_height codeword indicates the trim_height value as specified in table 37. Table 37: trim_height trim_height trim_height in dB 0 - 3 reserved 4 -0,75 5 -1,5 6 -3 7 -4,5 8 -6 9 -7,5 10 -9 11 -10,5 12 -12 13 -13,5 14 -16 15 -36 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.9 bal3D_Y_sign_tb_code | The bal3D_Y_sign_tb_code codeword indicates the direction of balance along the Y-axis to be applied in both the top and bottom planes as specified in table 38. Table 38: bal3D_Y_sign_tb indicated by bal3D_Y_sign_tb_code bal3D_Y_sign_tb_code bal3D_Y_sign_tb Meaning 0 -1 The balance is towards the front of the room. 1 1 ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.10 bal3D_Y_amount_tb | The bal3D_Y_amount_tb codeword indicates the amount of balance along the Y-axis to be applied in both the top and bottom planes, determined as: bal3D_Y_tb = bal3D_Y_sign_tb × bal3D_Y_amount_tb . NOTE: bal3D_Y_sign_tb is specified in clause 5.6.5.9. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 52 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.11 bal3D_Y_sign_lis_code | The bal3D_Y_sign_lis_code codeword indicates the direction of balance along the Y-axis to be applied in the listener plane (z = 0) as specified in table 39. Table 39: bal3D_Y_sign_lis indicated by bal3D_Y_sign_lis_code bal3D_Y_sign_lis_code bal3D_Y_sign_lis Meaning 0 -1 The balance is towards the front of the room. 1 1... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.5.12 bal3D_Y_amount_lis | The bal3D_Y_amount_lis codeword indicates the amount of balance along the Y-axis to be applied in the listener plane (z = 0), determined as: bal3D_Y_lis = bal3D_Y_sign_lis × bal3D_Y_amount_lis . NOTE: bal3D_Y_sign_lis is specified in clause 5.6.5.11. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6 extended_object_element | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.1 b_obj_div_block | The b_obj_div_block flag indicates whether an obj_div_block element is present in the bitstream per metadata update block. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.2 b_ext_prec_pos_block | The b_ext_prec_pos_block flag indicates whether an ext_prec_pos_block element is present in the bitstream per metadata update block. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.3 obj_div_block | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.3.1 b_object_divergence | The b_object_divergence flag indicates whether object divergence metadata is present in the bitstream. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.3.2 object_div_mode | The object_div_mode element indicates how the value of object_divergence is transmitted, as shown in table 40. Table 40: object_div_mode object_div_mode Description 0 indicated by object_div_table. 1 reuse object_divergence as transmitted in the previous obj_info_block. 2 indicated by object_div_code. 3 Reserved. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.3.3 object_div_table | The object_div_table element indicates the value of object_divergence as shown in table 41. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 53 Table 41: object_div_table object_div_table object_divergence 0 0,500755 1 0,608529 2 0,704833 3 1,0 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.3.4 object_div_code | The object_div_code indicates the value of object_divergence as shown in table 42. Table 42: object_div_code object_div_code object_divergence object_div_code object_divergence 0 reserved 32 0,704833 1 0 33 0,733123 2 0,004026 34 0,75932 3 0,00716 35 0,783416 4 0,012731 36 0,805451 5 0,020173 37 0,825506 6 0,028485 38 ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4 ext_prec_pos_block | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4.1 b_ext_prec_pos | The b_ext_prec_pos flag indicates whether extended precision position metadata is present in the bitstream. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4.2 ext_prec_pos_presence[] | If true, the Boolean elements of this array indicates that corresponding extended precision metadata elements are transmitted. If any extended precision metadata element is not transmitted its value shall be 0. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 54 Table 43 lists the correspondence between elements of ext_prec_pos_p... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4.3 ext_prec_pos3D_X | The ext_prec_pos3D_X indicates the extended precision position value to be used for calculation of pos3D_X as specified in clause 5.6.1.1.8 and clause 5.6.1.1.12. The extended precision value is shown in table 44. Table 44: ext_prec_pos3D_X ext_prec_pos3D_X Semantics 0 1 1 2 2 -1 3 -2 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4.4 ext_prec_pos3D_Y | The ext_prec_pos3D_Y indicates the extended precision value to be used for calculation of pos3D_Y as specified in clause 5.6.1.1.9 and clause 5.6.1.1.13. The extended precision value is shown in table 45. Table 45: ext_prec_pos3D_Y ext_prec_pos3D_Y Semantics 0 1 1 2 2 -1 3 -2 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 5.6.6.4.5 ext_prec_pos3D_Z | The ext_prec_pos3D_Z indicates the extended precision value to be used for calculation of pos3D_Z as specified in clause 5.6.1.1.11 and clause 5.6.1.1.14. The extended precision value is shown in table 46. Table 46: ext_prec_pos3D_Z ext_prec_pos3D_Z Semantics 0 1 1 2 2 -1 3 -2 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6 Joint object coding | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.1 Introduction | The JOC tool is a post-processor to the E-AC-3 decoder. It enables decoding of up to 16 OBA essences from a channel- based E-AC-3 bitstream. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 55 The JOC decoder performs a quadrature mirror filter bank domain matrix operation to reconstruct the output objects. The coefficients of th... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2 Bitstream syntax | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2.1 joc | Syntax No of bits joc() { joc_header(); joc_info(); joc_data(); if (joc_ext_config > 0) { joc_ext_data(); } padding_bits; ................................................................. 0...7 } |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2.2 joc_header | Syntax No of bits joc_header() { joc_dmx_config_idx; ............................................................... 3 joc_num_objects_bits; ............................................................. 6 joc_ext_config_idx; ............................................................... 3 } |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2.3 joc_info | Syntax No of bits joc_info() { joc_clipgain_x_bits; .............................................................. 3 joc_clipgain_y_bits; .............................................................. 5 joc_seq_count_bits; .............................................................. 10 for (obj = 0; obj < joc_num_obj... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2.4 joc_data_point_info | Syntax No of bits joc_data_point_info(obj) { joc_slope_idx[obj]; ............................................................... 1 joc_num_dpoints_bits[obj]; ........................................................ 1 if (joc_slope_idx[obj] == 1) { for (dp = 0; dp < joc_num_dpoints[obj]; dp++) { joc_offset_ts_bits[obj,d... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.2.5 joc_data | Syntax No of bits joc_data() { for (obj = 0; obj < joc_num_objects; obj++) { if (b_joc_obj_present[obj]) { for (dp = 0; dp < joc_num_dpoints[obj]; dp++) { if (b_joc_sparse[obj] == 1) { joc_channel_idx[0]; ....................................................... 3 joc_huff_code = get_joc_huff_code(joc_num_channels, IDX);... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3 Bitstream description | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.1 joc | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.1.1 joc overview | The joc block is the top-level element that contains all bitstream elements of the JOC side information. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 57 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2 joc_header | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2.1 joc_header overview | The joc_header block contains bitstream elements that indicate the JOC downmix configuration, the number of processed audio objects and the type of extensional JOC configuration data (if present in the bitstream). |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2.2 joc_dmx_config_idx | The joc_dmx_config_idx index indicates the JOC downmix configuration. Table 47 specifies the JOC downmix configuration indicated by joc_dmx_config_idx. Table 47: JOC downmix channel configuration joc_dmx_config_idx Downmix configuration Downmix channel 0 5.X L, R, C, (LFE), Ls, Rs 1 7.X L, R, C, (LFE), Ls, Rs, Lb, Rb 2... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2.3 joc_num_channels | The joc_num_channels helper variable indicates the number of channels in the JOC downmix. The value of joc_num_channels depends on the joc_dmx_config_idx index as listed in table 48. Table 48: Number of downmix channels joc_dmx_config_idx joc_num_channels 0 5 1 7 2 7 3 5 4 7 5...7 reserved |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2.4 joc_num_objects_bits | The joc_num_objects_bits unsigned integer indicates the value of joc_num_objects. The value of joc_num_objects is determined by the following equation: joc_num_objects = joc_num_objects_bits + 1 The maximum value for joc_num_objects_bits shall be 15. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.2.5 joc_ext_config_idx | The joc_ext_config_idx index indicates the type of extensional configuration data that is present in the bitstream. Table 49 specifies the extensional configuration data indicated by joc_ext_config_idx. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 58 Table 49: JOC extensional configuration data joc_ext_config_idx Extensional ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3 joc_info | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.1 joc_info overview | The joc_info block contains several bitstream elements per object that indicate the presence, quantization, frequency- and time resolution of the coded JOC parameters for the corresponding object. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.2 joc_clipgain_x_bits, joc_clipgain_y_bits | The joc_clipgain_x_bits and joc_clipgain_y_bits unsigned integers indicate the value of joc_clipgain. The value of joc_clipgain is determined by the following equation: joc_clipgain = 1+ joc_clipgain_y_bits 32 × 2joc_clipgain_x_bits The value of joc_clipgain is in [1; 8,75]. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.3 joc_seq_count_bits | The joc_seq_count_bits unsigned integer determines the value joc_seq_count that is the state of a frame sequence counter. The frame sequence counter is used for splice detection in the decoder. It is incremented by one every consecutive frame (up to 1 023). When the maximum value is reached, the counter restarts with t... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.4 b_joc_object_present | The b_joc_obj_present flag indicates whether JOC side information is present in the bitstream for the corresponding audio object. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.5 joc_num_bands_idx | The joc_num_bands_idx index indicates the value of joc_num_bands. Table 50 specifies the value of joc_num_bands indicated by joc_num_bands_idx. Table 50: Number of frequency bands for the JOC side information joc_num_bands_idx joc_num_bands 0 1 1 3 2 5 3 7 4 9 5 12 6 15 7 23 ETSI ETSI TS 103 420 V1.2.1 (2018-10) 59 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.6 b_joc_sparse | The b_joc_sparse flag indicates whether the JOC side information is coded in sparse mode. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.3.7 joc_num_quant_idx | The joc_num_quant_idx index indicates the value of joc_num_quant. The value of joc_num_quant is the number of quantization steps, used for the coding of JOC side information parameters. Table 51 specifies the value of joc_num_quant indicated by joc_num_quant_idx. Table 51: Number of quantization steps for the JOC side ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.4 joc_data_point_info | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.4.1 joc_data_point_info overview | The joc_data_point_info block contains bitstream elements that indicate the temporal extension of the JOC side information. The side information comprises the number of transmitted data points and the temporal interpolation processing. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.4.2 joc_slope_idx | The joc_slope_idx index indicates an interpolation type. The description of the interpolation type indicated by joc_slope_idx is listed in table 52. Table 52: Description of the interpolation type signalled by joc_slope_idx joc_slope_select Interpolation type description 0 smooth (linear interpolation) 1 steep (transit... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.4.3 joc_num_dpoints_bits | The joc_num_dpoints_bits unsigned integer indicates the number of JOC data points joc_num_dpoints. The value of joc_num_dpoints is determined by the following equation: joc_num_dpoints = joc_num_dpoints_bits + 1 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.4.4 joc_offset_ts_bits | The joc_offset_ts_bits unsigned integer indicates the quadrature mirror filter bank timeslot offset value joc_offset_ts. The offset value joc_offset_ts for the corresponding data point is determined by the following equation: joc_offset_ts = joc_offset_ts_bits + 1 ETSI ETSI TS 103 420 V1.2.1 (2018-10) 60 |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.5 joc_data | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.5.1 joc_data overview | The joc_data block contains bitstream elements that indicate the value of joc_idx, joc_vec or joc_mtx. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.5.2 joc_channel_idx | The joc_channel_idx index indicates the input channel for the corresponding parameter band. Table 53 lists the input channel indicated by joc_channel_idx for the two different cases joc_num_channels = 5 and joc_num_channels = 7. Table 53: JOC input channel for joc_num_channels = 5 or joc_num_channels = 7 joc_channel_id... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.3.5.3 joc_hcw | The joc_hcw Huffman codeword indicates the value of joc_channel_idx, joc_vec or joc_mtx, when decoded using the corresponding code. |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.4 Joint object coding decoder interfaces | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.4.1 Input | The joc_num_channels quadrature mirror filter bank matrices are input to the JOC decoder. QinJOC,(1, 2, ..., joc_num_channels) joc_num_channels complex valued quadrature mirror filter bank matrices corresponding to the number of input channels to be processed by the JOC decoder. NOTE: The QinJOC matrices each consist o... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.4.2 Output | The joc_num_objects quadrature mirror filter bank matrices are output of the JOC decoder. QoutJOC,(1, 2, ..., joc_num_objects) joc_num_objects complex valued quadrature mirror filter bank matrices corresponding to the number of output objects to be reconstructed by the JOC decoder. NOTE: The QoutJOC matrices each consi... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.4.3 Control | Control parameters of the JOC decoder are coded in the JOC side information. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 61 The parameters for the JOC reconstruction process are coefficients of a reconstruction matrix. To calculate these coefficients the decoder has an interface for temporal data points of coded matrix coeff... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.5 Parameter band mapping | For the JOC reconstruction process, the parameter bands of the JOC side information are mapped to the quadrature mirror filter bank subbands. The parameters contained in the JOC side information are transmitted per parameter band. The number of parameter bands is indicated by joc_num_bands, as specified in clause 6.3.3... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6 Joint object coding decoder | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.1 Introduction | The JOC decoder consecutively decodes, dequantizes and interpolates the JOC side information, and reconstructs the output objects using the processed side information. The consecutive processing steps are specified as follows: 1) Decoding of the JOC bitstream elements as specified in clause 6.6.2 2) Dequantization of t... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.2 Differential decoding of side information | For each object obj in [0; joc_num_objects-1], the JOC decoder shall decode the quantized coefficients for the reconstruction matrix joc_mix_mtx_q from the JOC bitstream elements. In pseudo code notation, the decoding process for b_joc_sparse[obj] == 1 is specified as: Pseudocode 2 // input: arrays joc_channel_idx[obj]... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.3 Huffman decoding of side information | The Huffman tables define huffman codewords implicitly. To decode quantized side information values, the JOC decoder shall decode the huffman codewords into values specified in clause A.1. The decoding process for huff_decode(joc_huff_code, joc_hcw) is specified as: Pseudocode 4 huff_decode(joc_huff_code, joc_hcw) { no... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.4 Dequantization of side information | The JOC decoder shall calculate the dequantized coefficients of the matrix joc_mix_mtx_dq from the quantized coefficients of the matrix joc_mix_mtx_q. In pseudo code notation the calculation is specified as: Pseudocode 5 for (obj=0; obj < joc_num_objects; obj++) { nquant = (joc_num_quant_idx[obj] == 0) ? 96 : 192; for ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.5 Temporal interpolation of side information | The JOC decoder shall calculate an interpolated matrix joc_mix_mtx_interp. In pseudo code notation, the calculation of joc_mix_mtx_interp is specified as: Pseudocode 6 ETSI ETSI TS 103 420 V1.2.1 (2018-10) 64 for (obj=0; obj < joc_num_objects; obj++) { for (ch=0; ch < joc_num_channels; ch++) { for (sb=0; sb < num_qmf_s... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 6.6.6 Reconstruction of the output objects | The JOC decoder shall calculate the output objects from the input channels utilizing the matrix joc_mix_mtx_interp. ETSI ETSI TS 103 420 V1.2.1 (2018-10) 65 Input and output are specified as follows: Output objects zobj(ts,sb) € QoutJOC,obj for obj = 0,...,joc_num_objects - 1 NOTE 1: In pseudocode zobj(ts,sb) is addres... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 7 Quadrature mirror filter bank domain processing | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 7.1 Introduction | To enable alias suppressed frequency-domain audio processing, a complex quadrature mirror filter bank analysis/synthesis transform pair can be employed. The quadrature mirror filter bank analysis transforms a real-valued time-domain input signal into a number of spectral subband signals, each of which represents a deci... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 7.2 Complex analysis processing | The analysis filter transforms n time domain samples into n complex frequency-domain subband samples. The analysis transform maintains a state buffer qana_filt of n_qmf_length real-valued samples. NOTE: In the following, it is assumed that real and imaginary parts are interleaved. 1) Update the input buffer qana_filt b... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 7.3 Complex synthesis processing | The synthesis filter transforms n complex frequency-domain subband samples Q[] into n real-valued time-domain samples. The synthesis transform maintains a state buffer qsyn_filt of 2*n_qmf_length real-valued samples. 1) Update the state buffer qsyn_filt by shifting out 2×n old samples. Pseudocode 13 /* shift samples by... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 7.4 Filter bank coefficients | The quadrature mirror filter bank is configured by the number n of QMF subband and the filter length n_qmf_length. The quadrature mirror filter bank in the present document uses n = 64 subbands, and a filter length of n_qmf_length = 640 (that is, 10 complex coefficients per subband). Table QWIN in the file ts_103420v01... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8 Enhanced AC-3 decoding | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8.1 Requirements on Enhanced AC-3 decoding | To decode OBA as specified in the present document, an E-AC-3 decoder, as specified in ETSI TS 102 366 [1] shall be used to decode the channel-based downmix from the incoming bitstream. The following additional requirements apply: • The E-AC-3 decoder shall pass the EMDF payload for JOC metadata to the decoder specifie... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8.2 Requirements on EMDF container | To be backward compatible, the payloads for OAMD and JOC side information shall be carried in the EMDF container. If the enhanced AC-3 bitstreams contains one or more dependent substreams, the EMDF container encompassing the payloads for OAMD and JOC side information shall be carried in the last dependent substream of ... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8.3 Extensions contained in the addbsi bitstream field | |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8.3.1 Syntax | For bitstreams conforming to the present document, the addbsi field in the same substream as the EMDF container encompassing the payloads for OAMD and JOC side information contains the following elements in given order: 1) reserved - 7 bits ETSI ETSI TS 103 420 V1.2.1 (2018-10) 69 2) flag_ec3_extension_type_a - 1 bit 3... |
615998d1ca83294bf09c70d936c0b900 | 103 420 | 8.3.2 Semantics |
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