JPWO2019207036A5 - - Google Patents
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- JPWO2019207036A5 JPWO2019207036A5 JP2020559398A JP2020559398A JPWO2019207036A5 JP WO2019207036 A5 JPWO2019207036 A5 JP WO2019207036A5 JP 2020559398 A JP2020559398 A JP 2020559398A JP 2020559398 A JP2020559398 A JP 2020559398A JP WO2019207036 A5 JPWO2019207036 A5 JP WO2019207036A5
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- frequency reconstruction
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符号化されたオーディオビットストリームを受信し、該符号化されたオーディオビットストリームは、前記オーディオ信号の低帯域部分を表すオーディオデータと、高周波再構成メタデータとを含み、
前記オーディオデータを復号して、復号された低帯域オーディオ信号を生成し、
前記符号化されたオーディオビットストリームから前記高周波再構成メタデータを抽出し、前記高周波再構成メタデータは、高周波再構成プロセスのための動作パラメータを含み、該動作パラメータは、前記符号化されたオーディオビットストリームの後方互換拡張コンテナ内に置かれたパッチングモードパラメータを含み、該パッチングモードパラメータの第１の値は、スペクトル変換を指し示し、該パッチングモードパラメータの第２の値は、位相ボコーダ周波数拡散による高調波トランスポジションを指し示し、
前記復号された低帯域オーディオ信号をフィルタリングして、フィルタリングされた低帯域オーディオ信号を生成し、
前記フィルタリングされた低帯域オーディオ信号及び前記高周波再構成メタデータを用いて、前記オーディオ信号の高帯域部分を再生成し、当該再生成することは、前記パッチングモードパラメータが前記第１の値である場合にスペクトル変換を含み、当該再生成することは、前記パッチングモードパラメータが前記第２の値である場合に位相ボコーダ周波数拡散による高調波トランスポジションを含み、
前記フィルタリングされた低帯域オーディオ信号を前記再生成された高帯域部分と組み合わせて、広帯域オーディオ信号を形成する、
ことを有し、
前記フィルタリングすること、前記再生成すること、及び前記組み合わせることは、オーディオチャンネル当たり３０１０サンプルの遅延で後処理動作として実行され、その結果、合成時間が合成ユニット内の３０１１番目のオーディオサンプルに適用される、
方法。 A method of performing high frequency reconstruction of an audio signal, the method comprising:
receiving an encoded audio bitstream, the encoded audio bitstream including audio data representing a lowband portion of the audio signal and high frequency reconstruction metadata;
decoding the audio data to produce a decoded low-band audio signal;
extracting the high-frequency reconstruction metadata from the encoded audio bitstream, the high-frequency reconstruction metadata including operating parameters for a high-frequency reconstruction process, the operating parameters corresponding to the encoded audio; a patching mode parameter placed in a backwards compatible extension container of the bitstream, a first value of the patching mode parameter indicating spectral transform, and a second value of the patching mode parameter by phase vocoder frequency spreading; pointing to the harmonic transposition,
filtering the decoded low-band audio signal to produce a filtered low-band audio signal;
regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata, the regenerating wherein the patching mode parameter is the first value; wherein said regenerating comprises harmonic transposition by phase vocoder frequency spreading when said patching mode parameter is said second value;
combining the filtered lowband audio signal with the regenerated highband portion to form a wideband audio signal;
have the
Said filtering, said regenerating and said combining are performed as post-processing operations with a delay of 3010 samples per audio channel , so that synthesis time is applied to the 3011th audio sample in the synthesis unit. Ru
Method.
符号化されたオーディオビットストリームを受信する入力インタフェースであり、前記符号化されたオーディオビットストリームは、前記オーディオ信号の低帯域部分を表すオーディオデータと、高周波再構成メタデータとを含む、入力インタフェースと、
前記オーディオデータを復号して、復号された低帯域オーディオ信号を生成するコアオーディオデコーダと、
前記符号化されたオーディオビットストリームから前記高周波再構成メタデータを抽出するデフォーマッタであり、前記高周波再構成メタデータは、高周波再構成プロセスのための動作パラメータを含み、該動作パラメータは、前記符号化されたオーディオビットストリームの後方互換拡張コンテナ内に置かれたパッチングモードパラメータを含み、該パッチングモードパラメータの第１の値は、スペクトル変換を指し示し、該パッチングモードパラメータの第２の値は、位相ボコーダ周波数拡散による高調波トランスポジションを指し示す、デフォーマッタと、
前記復号された低帯域オーディオ信号をフィルタリングして、フィルタリングされた低帯域オーディオ信号を生成する分析フィルタバンクと、
前記フィルタリングされた低帯域オーディオ信号及び前記高周波再構成メタデータを用いて、前記オーディオ信号の高帯域部分を再構成する高周波リジェネレータであり、前記再構成することは、前記パッチングモードパラメータが前記第１の値である場合にスペクトル変換を含み、前記再構成することは、前記パッチングモードパラメータが前記第２の値である場合に位相ボコーダ周波数拡散による高調波トランスポジションを含む、高周波リジェネレータと、
前記フィルタリングされた低帯域オーディオ信号を前記再構成された高帯域部分と組み合わせて、広帯域オーディオ信号を形成する合成フィルタバンクと、
を有し、
前記分析フィルタバンク、前記高周波リジェネレータ、及び前記合成フィルタバンクは、オーディオチャンネル当たり３０１０サンプルの遅延でポストプロセッサにて実行され、その結果、合成時間が合成ユニット内の３０１１番目のオーディオサンプルに適用される、
オーディオ処理ユニット。 An audio processing unit for performing high frequency reconstruction of an audio signal, the audio processing unit comprising:
an input interface for receiving an encoded audio bitstream, the encoded audio bitstream including audio data representing a lowband portion of the audio signal and high frequency reconstruction metadata; and ,
a core audio decoder that decodes the audio data to produce a decoded lowband audio signal;
A deformatter for extracting the high frequency reconstruction metadata from the encoded audio bitstream, the high frequency reconstruction metadata including operating parameters for a high frequency reconstruction process, the operating parameters being associated with the encoding. a patching mode parameter placed in a backward compatible extension container of the encoded audio bitstream, a first value of the patching mode parameter indicating a spectral transform and a second value of the patching mode parameter indicating a phase a deformatter indicating harmonic transposition by vocoder frequency spreading;
an analysis filterbank for filtering the decoded lowband audio signal to produce a filtered lowband audio signal;
A high-frequency regenerator for reconstructing a high-band portion of the audio signal using the filtered low-band audio signal and the high-frequency reconstruction metadata, wherein the reconstructing comprises: a high frequency regenerator comprising spectral conversion when it is a value of 1 and said reconstructing comprises harmonic transposition by phase vocoder frequency spreading when said patching mode parameter is said second value;
a synthesis filterbank that combines the filtered lowband audio signal with the reconstructed highband portion to form a wideband audio signal;
has
The analysis filterbank, the high frequency regenerator and the synthesis filterbank are executed in a post-processor with a delay of 3010 samples per audio channel so that the synthesis time is applied to the 3011th audio sample in the synthesis unit. Ru
audio processing unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023048111A JP7493076B2 (en) | 2018-04-25 | 2023-03-24 | Integration of high frequency reconstruction techniques with post-processing delay reduction |
| JP2024081437A JP2024099068A (en) | 2018-04-25 | 2024-05-20 | Integration of high frequency reconstruction techniques with reduced post-processing delay |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18169156 | 2018-04-25 | ||
| EP18169156.9 | 2018-04-25 | ||
| PCT/EP2019/060600 WO2019207036A1 (en) | 2018-04-25 | 2019-04-25 | Integration of high frequency audio reconstruction techniques |
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| JP2023048111A Division JP7493076B2 (en) | 2018-04-25 | 2023-03-24 | Integration of high frequency reconstruction techniques with post-processing delay reduction |
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| Publication Number | Publication Date |
|---|---|
| JP2021522543A JP2021522543A (en) | 2021-08-30 |
| JPWO2019207036A5 true JPWO2019207036A5 (en) | 2023-01-25 |
| JP7252976B2 JP7252976B2 (en) | 2023-04-05 |
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| JP2020559398A Active JP7252976B2 (en) | 2018-04-25 | 2019-04-25 | Integration of high-frequency reconstruction techniques with post-processing delay reduction |
| JP2023048111A Active JP7493076B2 (en) | 2018-04-25 | 2023-03-24 | Integration of high frequency reconstruction techniques with post-processing delay reduction |
| JP2024081437A Pending JP2024099068A (en) | 2018-04-25 | 2024-05-20 | Integration of high frequency reconstruction techniques with reduced post-processing delay |
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| JP2024081437A Pending JP2024099068A (en) | 2018-04-25 | 2024-05-20 | Integration of high frequency reconstruction techniques with reduced post-processing delay |
Country Status (15)
| Country | Link |
|---|---|
| US (7) | US11527256B2 (en) |
| EP (1) | EP3785260A1 (en) |
| JP (3) | JP7252976B2 (en) |
| KR (1) | KR20210005164A (en) |
| CN (9) | CN118800273A (en) |
| AU (3) | AU2019258524B2 (en) |
| BR (1) | BR112020021832A2 (en) |
| CA (1) | CA3098064A1 (en) |
| CL (1) | CL2020002745A1 (en) |
| IL (4) | IL278223B2 (en) |
| MA (1) | MA52530A (en) |
| MX (10) | MX2020011206A (en) |
| SG (1) | SG11202010374VA (en) |
| WO (1) | WO2019207036A1 (en) |
| ZA (2) | ZA202006518B (en) |
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| CN113436603B (en) * | 2021-06-28 | 2023-05-02 | 北京达佳互联信息技术有限公司 | Method and device for training vocoder and method and vocoder for synthesizing audio signals |
| CN114519121A (en) * | 2021-12-30 | 2022-05-20 | 赛因芯微(北京)电子科技有限公司 | Audio serial metadata block generation method, device, equipment and storage medium |
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2019
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