1316823 九、發明說明： 【發明所屬之技術領域】 法，特別s:有關於一種數位影音資料之錄製系統與方 :二於—種能夠同步錄製數位視訊及音訊資料 之糸統與方法。 只^ 【先前技術】 多媒體影音資料的整合是現今科技的—個趨勢，而所 I的夕媒體衫日資料—般泛指涵蓋包含了各種視聽感官的 貝；斗訊號例如旎夠用以播放出影像的視訊資料以及用以 播放出音效的音訊資料。將這些資料訊號整合在同一個平 台上共同進行處理、儲存及播放，可使最終的影音資訊内 容更加生動。 一般來說，由於數位資料具有處理方便以及儲存容易 :特性’因此在目前許多種數位影音資料處理线中，都 曰將原本以類比形式存在的影音訊號先轉換為數位形式的 景/ s資料之後再加以處理或儲存。例如一般常見的數位監 視系統或數位錄影機，都會將自系統外界接收而來的類比 視。τι訊號及音訊訊號先轉換為數位視訊資料及音訊資料之 後’再對這些視訊資料及音訊資料進行後續的處理以及儲 存。 因此，在這些數位影音資料處理系統之中都會具有一 儲存裝置’用以儲存這些經處理過後的視訊及音訊資料， 其中’儲存裝置會將這些視訊及音訊資料視為檔案資料來 加以儲存，所以在系統中還會具有一擋案系統單元，用來 1316823 配置^己錄各個權案資料在儲存裝置當中所侣用的空間。 然數：影音資料處理系統會同時接收視 =號m统中卻是分別—視訊處理模組及—音訊: 二來=進行視訊訊號及音訊訊號的轉換及壓縮等處 :業’並且視訊處理模組及音訊處理模組在作掌時所來 的=ΪΓ同的。在正常情況之下，此二時脈訊號 輸出是固定必例，此時視訊資料及音訊資料的 了時Ε減狀態’但右其中有任何—個時脈訊號產生 ::脈飄移的現象時’此固定比例便不再存在， 及曰訊資料的輸出亦呈現非同步狀態。 、枓 因為在非同步狀態時，會產生視訊資料及音訊資料應 可互相對應的問題，故為因應非同步狀態的產生，在傳 =，都會另外在力…些額外的對應紀錄，以= 資料系統在讀取及播放這些視訊資料及音訊 士枓α夠正確地讀取相對應的視訊資料及音訊資料。盆 2龍紀錄可為每筆視訊資料記錄所應對應之音： 或者為每筆視訊資料及音訊資料都紀錄-絕對= =:來=位影音資料處理系統便可依據這些絕對時 間餘來正確地播放這些視訊資料及音訊資料。 對應紀錄的使用總是會多佔用額外的儲 子工a、別疋在使用絕對時間座標的紀錄方式時，還 酉己合另—組時脈訊號作為基準，增加了電路設計上的複雜 :搜：者’非同步狀態產生時’同時輸入至數位影音資料 處t統的視訊訊號及音訊訊號，也就是在播放時應該於 同時間出現的影像及音效，在分別經過視訊處理模組及 1316823 曰訊處理模組之處理成為 同時被輸出至儲存二後，並不會 被對應播放的視訊資料及立在衫曰播放時應同時 儲存η 在儲存裝置中所佔用的 傾存工間並不會互相鄰接，增加 丄 訊資料及音訊資粗拄+ 衣置在存取這些視 幹：：=體結構上所造成的負，也會使 田案糸、.先早7L §中的紀錄較為複雜。 【發明内容】 的就是在提供一種能夠同步錄製 因此本發明的主要目 影音資料的系統與方法。 能夠減少額外紀錄 本發明的更一目的就是在提供-種 空間的影音資料錄製系統與方法。 及 法 音 本發明的另-目的料在提供_種能夠簡化視訊資料 訊資料之儲存及讀取作業的影音資料錄製系統與方 為達到本發明之上述目的，本發明所提出的數位影音 錄^系統具有_視訊解碼器、—視訊預處理單元、一視訊 疋縮單几、—影音同步器、—類比-數位轉換器、-音訊預 處理單元、—音訊壓縮單元以及―檔案系統單元。其中， 視訊解碼11用以將自外界接收之類比視訊訊號轉換為數位 視訊訊號。視訊預處理單元用以對數位視訊訊號進行壓縮 前的-些預備處理’並會擷取出數位視訊訊號中的垂直同 步Α號。視訊壓縮單元用以利用垂直同步訊號來將數位視 訊訊號壓縮為數位視訊資料。影音同步器會以垂直同步訊 旒之速率為基準，產生處理音訊時所需要的取樣時脈訊 1316823 號。類比數位轉換器即依據取樣時脈訊號之速率來將自外 接輸入的類比音訊訊號取樣轉換為數位音訊訊號。音訊預 處理單元亦依據取樣時脈訊號之速率對數位音訊訊號進行 壓縮前的一些預備處理。一音訊壓縮單元用以將數位音訊 訊號壓縮為數位音訊資料。檔案系統單元用以將數位視訊 資料及數位音訊資料存入一儲存裝置之中。 為達到本發明之上述目的，本發明所提出的數位影音 錄製方法包含了幾個步驟：冑自外界接收之一類比視訊訊 號轉換為一數位視訊訊號。對數位視訊訊號進行壓縮前的 預備處理，並自數位視訊訊號當中操取出—垂直同步訊 號。依據垂直同步訊號將數位視訊訊號壓縮成為數位視訊 資料。以垂直同步訊號之速率為基準產生—取樣時脈訊 號。依據取樣時脈訊號之速率將自外界接收之—類比音訊 訊號轉換為-數位音訊訊號。依據取樣時脈訊號對數位音 訊訊號之速率進行壓縮前的預備處理。將數位音訊訊號壓 縮成為數位音訊資料。將數位視訊資料及數位音訊資料存 入一儲存裝置之中。 【實施方式】 由於在t的數位衫音資料處理系統中的視訊處理模 組及音訊處理模組是分別參考不同是時脈訊號來處理視訊 訊號及音訊訊號’因此在輸出數位視訊資料及數位音訊資 料時難免會有不同步的情況發生， 、 w 王也就是說，應該同時被 播放的數位視訊資料及數位立句 狀数位曰讯貧料可能不會同時為視訊 處理模組及音訊處理模组所铨 误、且所輸出，也因此該數位視訊資料 1316823 及數位音訊資料在儲存時就可能不會被儲存在相鄰的位 置’進而造成種種的問題。因此，本發明的基本概念便是 使視訊處理模組及音訊處理模組皆能以相同的時脈訊號為 基準’讓互相對應之視訊訊號及音訊訊號在視訊處理模組 及音訊處理模組之中能完全同步地被處理。 第1圖繪示了符合本發明之一實施例之數位影音錄製 系統之系統架構100,此種系統架構1〇〇係用以自外界同時 接收並處理相互對應之一類比視訊訊號丨20a以及—類比音 訊訊號122a，亦即，類比視訊訊號12〇a以及類比音訊訊號 在播放時是會同時被播放出來的。 系統架構100包含了 一視訊解碼器1〇2、一視訊預處理 單兀1〇4、一視訊壓縮單元1〇6、一影音同步器1〇8、一類 比-數位轉換器110、一音訊預處理單元112'一音訊壓縮單 元114以及一檔案系統單元116。其中，視訊解碼器 用以將類比視訊訊號120a轉換為一數位視訊訊號12〇b。視 汛預處理單元104用以對數位視訊訊號丨2〇b進行壓縮前的 些預備處理，例如視訊規格的轉換、解交錯或雜訊去除 等作業，並會自數位視訊訊號12〇b中擷取出視訊規格中的 垂直同步訊號124,其中，垂直同步訊號124 一般是用以通 知影像畫面的變換。視訊壓縮單元1〇6用以利用垂直同步 訊號124來將數位視訊訊號12〇b壓縮為數位視訊資料 120c，以便於儲存。影音同步器1〇8會以垂直同步訊號 的速率為基準，產生處理音訊訊號時所需要的取樣時脈訊 號 126。 以目前一般所使用的影音訊號規格為例，一秒的有聲 9 1316823 影像之中，大約會包含3〇張晝面以及8000個聲音取樣點。 因此在本實施例中，當垂直同步訊號124每產生3〇個訊號 週期，影音同步器108所輸出生的取樣時脈訊號126便會 跟著產生8000個訊號週期，也就是說，輸入影音同步器1〇8 的垂直同步訊號124及影音同步器108所輸出的取樣時脈 訊號126之訊號週期數量在單位時間内隨時會維持著3〇比 8000的比例。 接著，類比-數位轉換器110即能依據取樣時脈訊號126 之速率來將類比音訊訊號122a取樣轉換為數位音訊訊號 122b。音讯預處理單元112亦依據取樣時脈訊號i26之速 率對數位音訊訊號122b進行壓縮前的一些預備處理，例如 音sfl規格的轉換或雜訊去除等作業。音訊壓縮單元丨14用 以將數位曰Λ δίΐ號122b壓縮為數位音訊資料122c。標宰系 統單元116用以將數位視訊資料120c及數位音訊資料U2c 存入一儲存裝置118之中，如硬碟或光碟機。 如前所述，由於影音同步器的108的作用，輸入影音 同步器108的垂直同步訊號124及影音同步器1〇8所輸出 的取樣時脈訊號126之訊號週期數量隨時會維持著—定比 例，也就是說，處理視訊訊號及音訊訊號所參考的時脈訊 號皆源自於垂直同步訊號124。因此，互相對應的類比視訊 訊號120a及類比音訊訊號122a在處理及轉換成數位視訊 資料12〇c及數位音訊資料122c的過程當_可完全地維持 同步，亦即，數位視訊資料12〇c及數位音訊資料122c也 是互相對應的，是位於同一段影音晝面中的資料。其中’ 數位視訊資料120c及數位音訊資料122c也會同時為視气 1316823 /…〇6及音訊塵縮單元分別輸出，故檔案系統 早70 116能夠立即地將數位視訊資料mc及數位音訊資料 ::同:寺存入儲存裝置118之中相鄰的位置，如此在播放 ❼田片段時’檔案系統單元U6也能夠輕易地讀取出對庶 且鄰接的數位視訊資料⑽及數位音訊諸i22e，不再 要其他額外的紀錄資料，大大地降低了權案系統單元U6 的作業複雜度。 立在本實施例中所擷取出垂直同步訊號124亦可作為影 曰片&播放時的依據，以減低系統整體的電路複雜度。第2 圖1示了數位衫音錄製及播放系統之系統架構細，其中 係利用第I圖所示之視訊解碼器i02'視訊預處理單元 刚、視訊壓縮w影音同步器⑽、類比·數位轉換 益110乂音訊預處理單元112、音訊塵縮單i U4以及標案 =、先單7L 116來錄製影音資料之外’更包含用以播放影音 資料之視訊解壓縮單元202、一視訊後處理單元綱、— 視訊編碼H 2G6、-音訊解壓縮單元、—視訊後處理單 元210以及一數位-類比轉換器212。 檔案系統單元116會自儲存裝置118當中取出欲播放 之數位視訊資料214a以及數位音訊f料加，其中，數位 視訊資料214a以及數位音訊資料216a互相對應，即會於 同私像片奴之中播放的影像及音效。視訊解壓縮單元π〗 用以將數位視訊資料214a解壓縮成數位視訊訊號鳩，其 中即可«視訊預處理單元1〇4所搁取出的垂直同步訊號 124之速率來執行解_作業。視訊後處理單元2Q4用以對 數位視訊訊號214b進行—些編碼前的預備處理，其中亦可 1316823 訊訊號。在步驟312中，會依據取樣時脈訊號之速率對數 位音訊訊號進行壓縮前的預備處理。在步驟314中，會將 • 數位音訊訊號壓縮成為數位音訊資料。在步驟316中，會 將數位視訊資料及數位音訊資料存入一儲存装置之中，& - 中數位視訊資料及數位音訊資料互相對應，並於儲存裝置 之中存放於相鄰的位置。 、 雖然本發明已以一較佳實施例揭露如上，然其並非 • α限定本發明’任何熟習此技藝者，在不脫離本發明之: 神和範圍内，當可作各種之更動與潤飾，因此本發明之: 護範圍當視後附之申請專利範圍所界定者為準。 ’、 【圖式簡單說明】 &為讓本發明之上述和其他目的、特徵、優點與實 忐更明顯易懂，所附圖式之詳細說明如下：1316823 Nine, invention description: [Technical field of invention] Law, special s: There is a recording system and method for digital audio and video data: two kinds of systems and methods capable of synchronously recording digital video and audio data. Only ^ [Previous technology] The integration of multimedia audio and video data is a trend of today's technology, and the I-day media shirt day data generally refers to the cover of a variety of audio-visual senses; the fighting signal, for example, is enough to play out Video data of the image and audio data for playing the sound effect. Combining these data signals on the same platform for processing, storage and playback will make the final audio and video information more vivid. In general, digital data is easy to process and easy to store: characteristics'. Therefore, in many current digital audio and video data processing lines, the audio and video signals originally in analogy are converted into digital form/s data. Process or store it again. For example, a common digital surveillance system or a digital video recorder will compare the analogy received from the outside of the system. After the τι signal and the audio signal are first converted into digital video data and audio data, the video data and audio data are subsequently processed and stored. Therefore, in these digital audio and video data processing systems, there will be a storage device for storing the processed video and audio data. The storage device will store the video and audio data as archive data for storage. There will also be a file system unit in the system for 1316823 to configure the space used by each of the rights data in the storage device. However, the video and audio data processing system will receive the video in the same way. However, it is the video processing module and the audio: Secondly, the conversion and compression of video signals and audio signals: industry and video processing modules. The group and the audio processing module are the same when they are in the palm of the hand. Under normal circumstances, the output of the two-clock signal is a fixed example. At this time, the video data and the audio data are decremented by the state of 'there are any clock signals generated by the right: when the pulse drifts' This fixed ratio no longer exists, and the output of the data is also in an asynchronous state.枓Because in the non-synchronized state, there will be problems in which video data and audio data should correspond to each other. Therefore, in response to the occurrence of non-synchronous state, in the transmission =, there will be additional force... some additional corresponding records to = data The system is reading and playing the video data and the audio and video data to correctly read the corresponding video data and audio data. The basin 2 dragon record can be the corresponding sound for each video data record: or for each video data and audio data record - absolute = =: come = bit video data processing system can correctly correct these absolute time Play these video and audio materials. The use of the corresponding record will always take up more storage workers. A. When using the absolute time coordinate recording method, it also adds another group clock signal as a reference, which increases the complexity of the circuit design: : When the 'asynchronous state is generated', the video signal and audio signal input to the digital audio and video data unit at the same time, that is, the video and sound effects that should appear at the same time during playback, are respectively passed through the video processing module and 1316823 曰After the processing of the processing module is simultaneously output to the storage 2, the video data that is not played correspondingly and the storage device that is stored in the storage device should be stored at the same time. Adjacent, increased information and audio data Rough + clothing in access to these visual: : = the negative caused by the body structure, will also make the case of the case, the first 7L § record is more complicated. SUMMARY OF THE INVENTION It is a system and method for providing simultaneous recording of primary video material of the present invention. It is possible to reduce the extra record. A further object of the present invention is to provide a video recording system and method for a space. And the other object of the present invention is to provide a video and audio recording system capable of simplifying the storage and reading operation of video data, and to achieve the above object of the present invention, the digital video recording device proposed by the present invention The system has a video decoder, a video pre-processing unit, a video camera, a video synchronizer, an analog-to-digital converter, an audio pre-processing unit, an audio compression unit, and a file system unit. The video decoding 11 is configured to convert the analog video signal received from the outside into a digital video signal. The video pre-processing unit is configured to perform some pre-compression processing on the digital video signal and extract the vertical synchronization nickname in the digital video signal. The video compression unit is configured to compress the digital video signal into digital video data by using a vertical synchronization signal. The AV Synchronizer generates the sampling time pulse 1316823 required to process the audio based on the rate of the vertical sync signal. The analog digital converter converts the analog audio signal from the external input into a digital audio signal according to the rate of the sampling clock signal. The audio pre-processing unit also performs some preparatory processing before compressing the digital audio signal according to the rate of sampling the clock signal. An audio compression unit is used to compress the digital audio signal into digital audio data. The file system unit is used to store digital video data and digital audio data in a storage device. In order to achieve the above object of the present invention, the digital video recording method proposed by the present invention comprises several steps: converting an analog video signal from the outside into a digital video signal. The digital video signal is pre-compressed and processed from the digital video signal - the vertical sync signal. The digital video signal is compressed into digital video data according to the vertical sync signal. Generates a sampling clock signal based on the rate of the vertical sync signal. The analog audio signal received from the outside is converted to a digital audio signal according to the rate of the sampling clock signal. The pre-compression preparation is performed on the rate of the digital audio signal according to the sampling clock signal. The digital audio signal is compressed into digital audio data. The digital video data and the digital audio data are stored in a storage device. [Embodiment] The video processing module and the audio processing module in the digital audio processing system of t are respectively processing the video signal and the audio signal by referring to different clock signals. Therefore, the digital video data and the digital audio are outputted. In the case of data, it is inevitable that there will be unsynchronization. W King means that the video data and the number of digits that should be played at the same time may not be video processing modules and audio processing modules at the same time. The error and the output are also caused by the digital video data 1316823 and the digital audio data may not be stored in the adjacent location when stored, which causes various problems. Therefore, the basic concept of the present invention is to enable the video processing module and the audio processing module to use the same clock signal as a reference to enable the corresponding video signals and audio signals to be in the video processing module and the audio processing module. The middle can be processed completely synchronously. FIG. 1 is a diagram showing a system architecture 100 for a digital video recording system according to an embodiment of the present invention. The system architecture 1 is configured to simultaneously receive and process one of the analog video signals 20a and the corresponding ones from the outside. The analog audio signal 122a, that is, the analog video signal 12A and the analog audio signal are simultaneously played during playback. The system architecture 100 includes a video decoder 1 〇 2, a video pre-processing unit 〇 4, a video compression unit 1 〇 6, an audio-visual synchronizer 〇 8, an analog-to-digital converter 110, an audio pre- The processing unit 112' is an audio compression unit 114 and a file system unit 116. The video decoder is configured to convert the analog video signal 120a into a digital video signal 12〇b. The video pre-processing unit 104 is configured to perform some pre-compression processing on the digital video signal 丨2〇b, such as video format conversion, deinterlacing or noise removal, and from the digital video signal 12〇b The vertical sync signal 124 in the video format is taken out, wherein the vertical sync signal 124 is generally used to notify the conversion of the image frame. The video compression unit 1〇6 is configured to compress the digital video signal 12〇b into the digital video data 120c by using the vertical synchronization signal 124 for storage. The AV synchronizer 1〇8 generates a sampling clock signal 126 required to process the audio signal based on the rate of the vertical sync signal. Taking the audio and video signal specifications currently used as an example, one second of the 9 1316823 images will contain about 3 frames and 8000 sound sampling points. Therefore, in this embodiment, when the vertical sync signal 124 generates 3 signal cycles, the sample clock signal 126 outputted by the video synchronizer 108 is followed by 8000 signal cycles, that is, the input video synchronizer. The number of signal cycles of the vertical sync signal 124 of the 1〇8 and the sampling clock signal 126 output by the video synchronizer 108 maintains a ratio of 3〇 to 8000 at any time during the unit time. Then, the analog-to-digital converter 110 can sample the analog audio signal 122a into the digital audio signal 122b according to the rate of the sampling clock signal 126. The audio pre-processing unit 112 also performs some preparatory processing before the digital audio signal 122b is compressed according to the rate of the sampling clock signal i26, for example, the conversion of the sound sfl specification or the removal of noise. The audio compression unit 丨 14 is operative to compress the digital δ δ ΐ 122 122b into the digital audio material 122c. The standard system 116 is used to store the digital video data 120c and the digital audio data U2c in a storage device 118, such as a hard disk or an optical disk drive. As described above, due to the role of the video synchronizer 108, the number of signal cycles of the vertical sync signal 124 of the input video synchronizer 108 and the sample clock signal 126 output by the video synchronizer 1 随时 8 is maintained at any time - proportional That is to say, the clock signals referenced by the processing of the video signal and the audio signal are derived from the vertical sync signal 124. Therefore, the corresponding analog video signal 120a and the analog audio signal 122a can be completely synchronized during processing and conversion into the digital video data 12c and the digital audio data 122c, that is, the digital video data 12〇c and The digital audio data 122c also corresponds to each other, and is the data located in the same section of the audio and video. The 'digital video data 120c and the digital audio data 122c will also be output separately for the sight gas 1316823 /...〇6 and the audio dust reduction unit, so the file system can immediately display the digital video data mc and digital audio data:: Same as: the temple is stored in an adjacent position in the storage device 118, so that when the Putian segment is played, the file system unit U6 can also easily read the adjacent digital video data (10) and the digital audio information i22e, Additional additional documentation is required to greatly reduce the operational complexity of the rights system unit U6. The vertical sync signal 124 taken out in the present embodiment can also be used as a basis for the playback of the video & to reduce the overall circuit complexity of the system. Figure 2 shows the system architecture of the digital audio recording and playback system, which uses the video decoder i02' video pre-processing unit shown in Figure I, video compression w video synchronizer (10), analog-to-digital conversion益110乂 audio pre-processing unit 112, audio dust reduction single i U4 and standard=, first order 7L 116 to record audio and video data' further includes video decompression unit 202 for playing video and audio data, a video post-processing unit The video coding H 2G6, the audio decompression unit, the video post-processing unit 210, and a digital-to-analog converter 212. The file system unit 116 retrieves the digital video data 214a and the digital audio material to be played from the storage device 118. The digital video data 214a and the digital audio data 216a correspond to each other, and the video data is played in the same private photo slave. Image and sound effects. The video decompression unit π is used to decompress the digital video data 214a into a digital video signal, wherein the solution_operation can be performed at the rate of the vertical synchronization signal 124 taken by the video pre-processing unit 1〇4. The video post-processing unit 2Q4 is configured to perform pre-coding preparation processing on the digital video signal 214b, which may also be 1316823 signal. In step 312, the digital audio signal is pre-compressed according to the rate of the sampling clock signal. In step 314, the digital audio signal is compressed into digital audio data. In step 316, the digital video data and the digital audio data are stored in a storage device, and the digital video data and the digital audio data correspond to each other and are stored in adjacent locations in the storage device. Although the present invention has been disclosed in a preferred embodiment as described above, it is not intended to limit the invention to anyone skilled in the art, and various modifications and refinements may be made without departing from the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. The above and other objects, features, advantages and advantages of the present invention will become more apparent and understood.
夺統之二為！合本發明之一實施例之數位影音資料錄 糸統之糸統架構 第2圖為符合本發明之 及播放系統之系統架構。 第3圖為符合本發明之 方法之方法流程。 實施例之數位影音資料錄製 實施例之數位影音資料錄製 【主要元件符號說明】 1 〇〇 :系統架構 104 :視訊預處理單元 102 :視訊解碼器 106 :視訊壓縮單元 13 1316823 108 :影音同步器 112:音訊預處理單元 116 :檔案系統單元 120a :類比視訊訊號 120c :數位視訊資料 122b :數位音訊訊號 124 :垂直同步訊號 200 :系統架構 204 :視訊後處理單元 208 ··音訊解壓縮單元 212 :數位-類比轉換器 214b :數位視訊訊號 216a :數位音訊資料 216c :類比音訊訊號 302-316 :步驟 110 :類比-數位轉換器 114 :音訊壓縮單元 118 :儲存裝置 120b :數位視訊訊號 122a :類比音訊訊號 122c :數位音訊資料 126 :取樣脈波訊號 202 :視訊解壓縮單元 2 0 6 :視訊編碼 210 :音訊後處理單元 214a :數位視訊資料 214c :類比視訊訊號 216b :數位音訊訊號 300 :方法流程The second is the second! </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Figure 3 is a flow diagram of a method consistent with the method of the present invention. Digital Video and Audio Recording Recording of the Digital Audio and Video Recording Embodiment of the Embodiment [Main Component Symbol Description] 1 〇〇: System Architecture 104: Video Pre-Processing Unit 102: Video Decoder 106: Video Compression Unit 13 1316823 108: Video Synchronizer 112 : audio pre-processing unit 116: file system unit 120a: analog video signal 120c: digital video data 122b: digital audio signal 124: vertical synchronization signal 200: system architecture 204: video post-processing unit 208 · audio decompression unit 212: digital Analog converter 214b: digital video signal 216a: digital audio data 216c: analog audio signal 302-316: step 110: analog-to-digital converter 114: audio compression unit 118: storage device 120b: digital video signal 122a: analog audio signal 122c: digital audio data 126: sampling pulse wave signal 202: video decompression unit 2 0 6 : video coding 210: audio post-processing unit 214a: digital video data 214c: analog video signal 216b: digital audio signal 300: method flow
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