JP2006042041A - Information recorder, method for editing stream, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a postrecording processing at a high speed without deteriorating image quality regardless of kinds of the format of sound data in an already recorded data stream. <P>SOLUTION: The information recorder is provided with: a first audio SRC 33 for converting sound data in a DV stream recorded in a recording medium such as an HDD device 19 into sound data of a prescribed format in which data volume is compressed; a second audio SRC 36 for converting sound data prepared differently from the DV stream into sound data of a similar format; and a DV stream processor 31 for storing the sound data converted by respective audio SRCs 33, 36 in a sound data recording area of the original data stream and editing the sound data as a data stream integrated with the original image data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information recording apparatus for recording a data stream including video data and audio data on a recording medium, and a stream editing method and program therefor, and in particular, an information recording apparatus capable of post-recording processing of audio data of a DV stream. The present invention relates to a stream editing method and a program.

  Conventionally, MPEG (Moving Picture Experts Group) 2 standard and DV (Digital Video) standard are widely used as compression formats of video data. The former is used for compressing video signals of DVD (Digital Versatile Disk) and digital broadcasting, and the latter is widely used as a compression format for consumer digital video cameras.

  Recently, video recorders capable of recording MPEG2 standard video data on recordable DVDs, HDDs (Hard Disk Drives), and the like are rapidly spreading. Many of such video recorders have not only the ability to record and reproduce programs received through broadcast radio waves, for example, but also include an editing function for deleting or moving a part of the recorded video.

  On the other hand, DV standard video data recorded with a digital video camera can be edited recently by using an optical disk or the like as a recording medium for the camera, or by transmitting the captured video data to a personal computer or the like. It has become. In addition, in a Blu-ray disc, which is a new optical disc capable of recording HD (Hi-Definition) video, in addition to MPEG2 video recording, DV standard video stream (DV stream) can also be recorded as an option. Supported. For this reason, some video recorders using a Blu-ray disc may have a DV stream editing function.

  Furthermore, in the DV standard, in addition to video editing, as a simple editing function, audio after-recording, such as adding background music to the video material after shooting or adding audio explanation of the video, so-called after-recording is possible It is said that. Currently, four audio data compression formats as shown in Table 1 below are used as audio data recording modes of the consumer DV standard.

  As shown in Table 1, the first mode is a “48k mode”, which is linearly quantized with a sampling frequency (Fs) of 48 kHz and a quantization bit number of 16 bits. The second is the “44.1k mode”, in which Fs is 44.1 kHz, the number of quantization bits is 16 bits, and linear quantization is performed. The third is “32k mode”, in which Fs is 32 kHz, and the number of quantization bits is 16 bits, and linear quantization is performed. In both cases, two-channel audio data can be recorded and reproduced simultaneously.

  On the other hand, the fourth is the “32k-4ch mode” and the Fs is the same 32 kHz, but the quantization bit number is 12 bits, and the non-linear quantization is performed. . That is, at the time of shooting with a digital video camera, after audio data of 2 channels is recorded with Fs32k and quantization bit number 12 bits, an audio signal is further input to generate audio data of the same format, and the remaining 2 channels It is possible to easily perform post-recording on a digital video camera.

As a related art, in an audio / video data recording / reproducing apparatus that multiplexes video and audio in accordance with the MPEG system standard, after-recording audio data without holding a huge amount of information in the management information area There is one that can be used (for example, see Patent Document 1).
Japanese Patent Publication No. 2000-23102 (paragraph numbers [0034] to [0083], FIG. 1)

  By the way, it is possible to perform audio data dubbing in the above-mentioned “32k-4ch mode” even with a DV camera or a DV deck that is currently on the market. However, in such an apparatus, in order to perform audio data after-recording on video data recorded on a recording medium, a DV stream in the “32k-4ch mode” which is a data format in which a data area for after-recording is secured in advance. Had to be recorded.

  In other words, in the conventional DV standard or the like, even with the same video data format, after-recording processing may not be possible depending on the audio data format. Therefore, even if the user of the recording / playback device for video / audio data is a DV stream recorded in the same video data format, is the data format of the recorded audio data compatible with post-recording processing? It is necessary to confirm in advance.

  The present invention has been made in view of these points, and an object of the present invention is to provide an information recording apparatus that enables post-recording processing without deterioration in image quality regardless of the type of data format of audio data.

Another object of the present invention is to provide a stream editing method that enables post-recording processing without deterioration in image quality regardless of the type of data format of audio data.
Furthermore, another object of the present invention is to provide a stream editing program for enabling post-recording processing without deterioration in image quality regardless of the type of data format of audio data.

  In the present invention, in order to solve the above problem, in an information recording apparatus for recording a data stream including image data and audio data on a recording medium, the audio data of the processing target data stream recorded on the recording medium is First data converting means for converting the data amount into audio data of a predetermined format and audio data prepared separately from the data stream to be processed are converted into audio data of the predetermined format. 2 data conversion means, audio data converted by the first data conversion means and audio data converted by the second data conversion means are stored in an audio data recording area of the data stream to be processed. Stream recording processing means for recording on the recording medium as a data stream integral with the original image data; The information recording apparatus is provided, characterized in that it comprises.

  In such an information recording apparatus, since the audio data in the data stream to be processed is compressed and converted into the format for after recording by the first data conversion means, the audio data recording area of the original data stream is not available. An area occurs. Also, audio data different from this is compressed and converted into the same format by the second data conversion means. In the stream recording processing means, the audio data compressed and converted by the first data converting means is recorded in the audio data recording area in the original data stream, and further compressed and converted into an empty area by the second data converting means. The recorded audio data is stored.

  According to the present invention, in the stream editing method for editing the data stream including the video data and the audio data and recording the data stream on the recording medium, the first data conversion unit includes the processing target recorded on the recording medium. The first step of converting the audio data of the data stream into the audio data of a predetermined format in which the data amount is compressed, and the audio data prepared by the second data conversion means separately from the data stream to be processed Is converted into audio data of the predetermined format, and the stream recording processing means converts the audio data converted in the first step and the audio data converted in the second step, Stored in the audio data recording area of the data stream to be processed, the data stream integrated with the original image data Stream editing method characterized by comprising a third step of recording the recording medium is provided.

  In such a stream editing method, the audio data in the data stream to be processed is compressed and converted into a format for after recording in the first step, so that there is a free area in the audio data recording area of the original data stream. Will occur. In the second step, audio data different from this is compressed and converted into the same format. In the third step, the audio data compressed and converted in the first step is recorded in the audio data recording area in the original data stream, and further the audio data compressed and converted in the second step to the empty area. Is stored.

  According to the present invention, the data format of the audio data is independent of the image data by the two data conversion means without checking the data format of the audio data multiplexed together with the image data of the recording medium one by one. Therefore, after-recording of audio data can be performed without degrading image data.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a main configuration of the information recording apparatus according to the embodiment. The operation of each block shown in FIG. 1 is comprehensively controlled by a system controller (not shown).

  The information recording apparatus includes a video input terminal 10 to which an analog video signal is input and an audio input terminal 11 to which an analog audio signal is input, to which a video device such as a TV tuner is connected. A video signal input from the video input terminal 10 is supplied to an NTSC (National Television System Committee) decoder 12, a pre-video signal processing circuit 13, an MPEG encoder 14, a multiplexer / demultiplexer circuit 17 including a multiplexer 15 and a demultiplexer 16, and a buffer controller 18. Thus, it is recorded as an MPEG transport stream (hereinafter referred to as MPEG-TS) on a recording medium in the HDD device 19 or the optical disk device 20.

  Also, the audio signal input from the audio input terminal 11 is supplied to the MPEG encoder 14 via the audio A / D converter 21, and the recording medium in the HDD device 19 via the multiplexing / demultiplexing circuit 17 and the buffer controller 18 described above. Are recorded as MPEG-TS.

  The NTSC decoder 12 subjects the video signal from the video input terminal 10 to A / D conversion processing and chroma encoding processing, converts the video signal to a digital component video signal, and sends the video data to the pre-video signal processing circuit 13. Output.

  The pre-video signal processing circuit 13 performs various video data processing such as pre-filtering on the video data from the NTSC decoder 12 and outputs the video data to the MPEG encoder 14 and the post video signal processing circuit 22.

  In the MPEG encoder 14, the video data from the pre-video signal processing circuit 13 is subjected to MPEG coding processing such as block DCT (Discrete Cosine Transform) processing and motion compensation processing, and an elementary stream (Elementary) composed of video data is processed. Stream: hereinafter referred to as video ES) is generated and output to the multiplexing / demultiplexing circuit 17.

  On the other hand, an audio A / D converter 21 to which an audio signal is input from the audio input terminal 11 performs A / D conversion processing on the input audio signal and outputs audio data to the MPEG encoder 14.

  The MPEG encoder 14 compresses audio data in accordance with the MPEG system, thereby generating an elementary stream (hereinafter referred to as audio ES) composed of audio data, and outputs it to the multiplexing / demultiplexing circuit 17.

  The multiplexing / demultiplexing circuit 17 generates MPEG-TS by performing multiplexing processing using various control signals on the video ES and audio ES from the MPEG encoder 14 during data recording, and outputs the MPEG-TS to the buffer controller 18. .

  The buffer controller 18 performs control for intermittently sending MPEG-TS input continuously from the multiplexing / demultiplexing circuit 17 to the HDD device 19 at the subsequent stage. The buffer controller 18 temporarily stores the MPEG-TS in the built-in buffer because the MPEG-TS cannot be written when the HDD device 19 is performing a seek operation, for example. When it becomes possible to write again, the HDD is configured to record continuously input MPEG-TS without interruption by writing at a rate higher than the input rate from the multiplexing / demultiplexing circuit 17. The device 19 and the optical disk device 20 are controlled.

  The HDD device 19 includes a recording medium such as a magnetic disk, and records MPEG-TS and a DV stream (to be described later) at a predetermined address in accordance with a control signal from a system controller (not shown). The same applies to the case where the optical disk device 20 is used as a recording medium, and recording can be performed using a recording medium such as a magneto-optical disk or a solid-state memory.

  In this information recording apparatus, the MPEG-TS read from the HDD device 19 or the optical disk device 20 is decoded by the MPEG decoder 23 via the buffer controller 18 and the multiplexing / demultiplexing circuit 17, so that video data and audio data are respectively obtained. Data is created, and the video data is output to the outside via the post video signal processing circuit 22, the NTSC encoder 24, and the video signal output terminal 25 and reproduced. The audio data created by the MPEG decoder 23 is configured to be output to the outside via the first selector 26, the audio D / A converter 27, and the audio signal output terminal 28 for reproduction.

  The HDD device 19 seeks to a predetermined address in accordance with a control signal for reproducing data from a system controller (not shown), reads the MPEG-TS, and outputs it to the buffer controller 18.

The buffer controller 18 performs buffer control so that the intermittently input MPEG-TS is continuously output, and outputs the MPEG-TS to the multiplexing / demultiplexing circuit 17.
The multiplexing / demultiplexing circuit 17 extracts the video ES and audio ES from the MPEG-TS, and outputs them to the MPEG decoder 23.

  The MPEG decoder 23 performs decoding processing on the input video ES and audio ES, outputs video data to the post video signal processing circuit 22, and outputs audio data to the first selector 26.

  Video data is input to the post video signal processing circuit 22 from the MPEG decoder 23, the pre video signal processing circuit 13, and a DV decoder 32 described later. In this post video signal processing circuit 22, output switching of video data from the pre video signal processing circuit 13, video data from the MPEG decoder 23, or video data from the DV decoder 32 is performed in accordance with a control signal from the system controller. At the same time, synthesis processing and filter processing are performed, and the processed video data is output to the NTSC encoder 24.

  In the NTSC encoder 24, the video data from the post video signal processing circuit 22 is converted into a luminance signal and a color difference signal and D / A conversion processing is performed, and an analog composite video signal is output from the video signal output terminal 28. The

  On the other hand, to the first selector 26 to which audio data is input from the MPEG decoder 23, audio signals from the audio A / D converter 21 and a DV decoder 32 described later are also input. In the first selector 26, any audio data is output to the audio D / A converter 27 in accordance with a control signal from the system controller.

  The audio D / A converter 27 performs D / A conversion processing on the audio data from the first selector 26 and outputs an analog audio signal from the audio signal output terminal 28.

  Further, in this information recording apparatus, a DV stream is input from the digital input terminal 29 and is recorded on a recording medium in the HDD device 19 or the optical disc device 20 via the second selector 30, DV stream processor 31, and buffer controller 18. Is configured to do.

  The digital input terminal 29 is connected to a device such as an external digital video camera, and a DV stream including video data and audio data from the external device via a digital interface such as IEEE (The Institute of Electrical and Electronics Engineers) 1394. Is entered.

  The second selector 30 receives a DV stream from an external device and a DV stream recorded on a recording medium of the HDD device 19 or the optical disc device 20 via the buffer controller 18 and selects one of them.

  When a DV stream from an external device is selected by the second selector 30, the DV stream processor 31 converts the DV stream packet so that it is suitable for recording on a recording medium. The processed DV stream is recorded on the recording medium of the HDD device 19 or the optical disc device 20 via the buffer controller 18 in the same manner as the MPEG-TS input from the multiplexing / demultiplexing circuit 17.

  Further, when playing back a DV stream recorded on the HDD device 19 or the optical disc device 20, the storage device such as the HDD device 19 or the optical disc device 20 reads the DV stream from a predetermined address in accordance with a control signal from the system controller. And output to the DV decoder 32 via the buffer controller 18 and the second selector 30.

  Further, when a DV stream input via the digital input terminal 29 is reproduced, this DV stream is input to the DV decoder 32 via the second selector 30. The DV decoder 32 performs a DV decoding process on the DV stream from the second selector 30 to reproduce a video signal and an audio signal. The video signal and the audio data are the post video signal processing circuit 22 and the first video signal, respectively. To the selector 26.

  The video signal is input to the NTSC encoder 24 through the post video signal processing circuit 22, and the digital video of the DV stream is converted into an analog signal and output from the video signal output terminal 25 to a monitor (not shown). The audio signal is input to the audio D / A converter 27 via the first selector 26, and the analog audio signal is output from the audio signal output terminal 28.

In addition to the above blocks, the information recording apparatus is provided with the following blocks for processing audio signals for post-recording.
The first audio sampling rate converter (SRC) 33 converts the audio signal output from the DV decoder 32 into an audio signal having a sampling rate of 32 kHz suitable for the post-recording standard.

  On the other hand, an after-recording digital audio signal is input from the digital audio input terminal 34 to the second audio SRC 36 via the third selector 35. The third selector 35 receives a digital audio signal input from the digital audio input terminal 34 and an analog audio signal input from the audio input terminal 11 as audio signals that can be used for post-recording. The digital audio signal AD-converted by the above, the uncompressed digital audio signal read from the storage device, and the digital audio signal obtained by decompressing the MPEG compressed audio signal read from the storage device by the MPEG decoder 23 are input. Any one of them is selected and input to the second audio SRC 36.

  In the second audio SRC 36, as in the first audio SRC 33, the digital audio signal is converted into an audio signal having a sampling rate of 32 KHz suitable for the post-recording standard.

  The DV stream processor 31 includes two audio SRCs 33, an audio signal obtained by converting a prerecorded digital audio signal to a sampling rate of 32 KHz, and an audio signal obtained by similarly converting an audio signal acquired for post-recording. 36, and converts them into 12-bit nonlinear quantized data suitable for the after-recording mode of the DV standard. At this time, a DV stream read from the storage device is input to the DV stream processor 31 via the second selector 30, and the audio data recording area is referred to the audio data recording area while referring to the DV stream. A post-recording process is performed to reconstruct the audio data format in the DV stream so as to overwrite the 12-bit non-linear quantized data converted according to the above.

  Thereafter, the post-recorded DV stream is returned to the buffer controller 18 and recorded in any storage device such as the HDD device 19 or the optical disk device 20.

Next, the data format of the DV stream generated by the after-recording process will be described. FIG. 2 is a diagram illustrating a data structure of a 1DV frame.
FIG. 2 shows a data stream structure defined by the DV standard in the NTSC system called 525/60 system. The DV stream is a video compression method using intra-frame prediction, and data is processed in units of 120,000 bytes of data (DV frames) corresponding to picture frame units of NTSC video. Further, a unit called a DIF sequence corresponding to one track on the DV tape is defined, and data of each DIF sequence is segmented in units of 80-byte DIF blocks.

  As shown in FIG. 2, a 1DV frame is composed of 10 DIF sequences, and each DIF sequence further includes 150 DIF blocks. Each DIF block is an 80-byte data string, and includes a 3-byte ID portion and a 77-byte data portion.

  Each DIF sequence includes a header part, a subcode part, a VAUX (video auxiliary) part, and an audio & video part. The header part is one header DIF block, the subcode part is two subcode DIF blocks, and a VAUX part. Is composed of 3 VAUX / DIF blocks, and the audio & video section is composed of 9 audio DIF blocks and 135 video DIF blocks.

FIG. 3 is a diagram schematically showing how data is exchanged during post-recording processing.
In the case of 2-channel recording such as “48k mode”, “44.1k mode”, and “32k mode” shown in Table 1 above, 5 DIF sequences, which are half of 10 DIF sequences in 1 DV frame PCM data of channel 1 is recorded in (for example, # 0 to # 4), and PCM data of channel 2 is recorded in the remaining five DIF sequences (for example, # 5 to # 9).

  On the other hand, in the “32k-4ch mode” consisting of 12-bit nonlinear quantized data suitable for the post-recording standard, the PCMs of channel 1 and channel 2 are divided into five DIF sequences (for example, # 0 to # 4) in half Data is recorded, and the PCM data of channel 3 and channel 4 is recorded in the remaining five DIF sequences (for example, # 5 to # 9). Then, after-recording sound is recorded on the channel 3 and the channel 4.

  Therefore, when post-recording processing is performed on a DV stream recorded in the 2-channel recording mode, the audio DIF blocks (A0 to A8) of all DIF sequences (# 0 to # 9) are read from the storage device, and the first The amount of PCM data is compressed by the audio SRC 33 and the DV stream processor 31, and the audio DIF blocks (A0 to A8) of the five DIF sequences (# 0 to # 4) from the beginning are used as the PCM data of channel 1 and channel 2. The PCM data area of the remaining DIF sequence (# 5 to # 9) is recorded as an empty area.

  On the other hand, also in the second audio SRC 36, the after-recording audio data selected by the third selector 35 is sampled again at 32 kHz, and the DV stream processor 31 further formats the non-linear quantized data whose quantization bit number is 12 bits. Convert to This data is recorded as channel 3 and channel 4 in the audio DIF blocks (A0 to A8) of the remaining DIF sequence (# 5 to # 9).

  In this way, the audio data recorded in the 2-channel recording mode is compressed and stored in the original half of the data area, and after-recording audio data is stored in the remaining area, thereby increasing the total data amount. And can be converted into a DV stream in the 4-channel recording mode. At this time, re-conversion processing such as compression / decompression is not necessary for the video data, and the image quality of the video is not deteriorated.

  FIG. 4 is a flowchart showing the flow of processing during post-recording processing in this information recording apparatus. The following processing is controlled in an integrated manner by a system controller (not shown).

  In step ST1, either the one recorded on the recording medium of the HDD device 19 or the optical disc device 20 or the one recorded on the external DV device via the digital input terminal 29 in the second selector 30 is a DV stream. Is selected as the input source. The selected DV stream is input to the DV decoder 32.

In step ST2, the after-recording sound source is selected by the third selector 35, and the selected sound source data is input to the second audio SRC 36.
In step ST3, the DV decoder 32 starts the DV decoding process. The decoded audio data is output to the first audio SRC 33. The decoded video data is input to the NTSC encoder 24 via the post video signal processing circuit 22, and the digital video of the DV stream is converted into an analog signal and output from the video signal output terminal 25 to a monitor (not shown). The This makes it possible to perform post-recording processing while confirming the video to be processed.

  In step ST4, channel number information and sampling frequency information recorded in an AAUX (Audio Auxiliary) data area in the audio DIF block are acquired. Based on these pieces of information, the recording format of the audio data in the DV stream is determined. If the recording format is “48k mode” or “44.1k mode”, the process proceeds to step ST5. The audio data output to the SRC 33 is converted into a sampling frequency of 32 kHz, and further converted into 12-bit non-linear quantized data by the DV stream processor 31 in step ST6. If the recording format is “32k-2ch mode”, the process proceeds to step ST6, and the audio data output from the DV decoder 32 is output to the DV stream processor 31 as it is and converted into 12-bit non-linear quantized data. The If the recording format is “32k-4ch mode”, the post-recording process can be performed as it is, so steps ST5 and 6 are skipped and the process proceeds to step ST7.

  In step ST 7, the sampling frequency of the after-recording sound input to the second audio SRC 36 is converted to 32 kHz and output to the DV stream processor 31. Next, the process proceeds to step ST8, where the DV stream processor 31 converts the post-recording voice quantization method into 12-bit non-linear quantized data.

  In step ST9, the audio data (audio DIF block) on the DV stream input to the DV stream processor 31 is rewritten by the data generated in steps ST6 and ST8 for each DV frame. At this time, the AAUX data is similarly rewritten to an appropriate value.

  Finally, in step ST10, the post-recorded DV stream is recorded in a storage device such as the HDD device 19 or the optical disc device 20 via the buffer controller 18.

  As described above, in the information recording apparatus of the present embodiment, even if the data format of the audio signal cannot be post-recorded, the DV stream recorded on the recording medium such as the HDD apparatus 19 or the optical disk apparatus 20 This enables post-recording processing. At that time, without confirming the data format of the audio signal multiplexed on the video signal of the recording medium as in the prior art, only the data format of the audio signal is independent of the video signal by the two audio SRCs 33 and 36. The post-recording process can be performed by converting. In addition, the already recorded video signal itself can be subjected to audio post-recording processing without performing decompression processing, recompression processing, or the like that would cause degradation, so that the image quality of the re-recorded DV stream deteriorates. There is no fear.

  In addition, audio data recorded in advance in a storage device in the information recording apparatus can be used as an after-recording sound source. Especially when the storage device is a random access device such as an HDD or an optical disk, the audio data can be used. By simultaneously performing the data reading and the data writing after the after-recording process, the after-recording process can be performed at a high speed in a time shorter than the time for normal reproduction of the audio data.

  Further, for example, even when there is a DV stream photographed in an audio 2ch mode by an external digital video camera, the DV stream is input to the digital input terminal 29 of the information recording apparatus and an after-recording process is performed on an optical disc or the like. It is also possible to record on another recording medium. In this way, it is possible to easily create higher-quality video content by effectively utilizing the current video resources.

  Although the video recorder has been described in the above embodiment, the present invention can also be applied to, for example, a digital video camera having an imaging function. At this time, it is desirable to use a storage device capable of random access as a storage device for recording video / audio data such as a DV stream in advance.

  The present invention can also be applied to information processing equipment such as a personal computer. In that case, a program describing the processing contents of the functions that the information recording apparatus should have is provided. And the said processing function is implement | achieved on a computer by running the program with a computer. The program describing the processing contents can be recorded on a computer-readable recording medium. Examples of the computer-readable recording medium include a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory.

  When the program is distributed, for example, a portable recording medium such as an optical disk on which the program is recorded is sold. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. In addition, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

It is a block diagram which shows schematic structure of the information recording device which concerns on embodiment. It is a figure which shows the data structure of 1DV frame of a DV stream. It is a figure which shows typically the mode of the replacement of the data at the time of post-recording processing. It is a flowchart which shows the flow of the process at the time of the post-recording process in an information recording device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Video input terminal, 11 ... Audio input terminal, 12 ... NTSC decoder, 13 ... Pre image signal processing circuit, 14 ... MPEG encoder, 15 ... Multiplexer, 16 ... Demultiplexer, 17 ... Multiplexing / Separation circuit, 18 ... Buffer controller, 19 ... HDD device, 20 ... Optical disk device, 21 ... Audio A / D converter, 22 ... Post video signal processing circuit, 23 ... MPEG decoder, 24 ... NTSC Encoder, 25 ... Video signal output terminal, 26 ... First selector, 27 ... Audio D / A converter, 28 ... Audio signal output terminal, 29 ... Digital input terminal, 30 ... Second selector, 31 ... DV stream processor, 32 ... DV decoder, 33 ... first audio SRC, 3 ...... digital audio input terminal, 35 ...... third selector, 36 ...... second audio SRC

Claims (10)

In an information recording apparatus for recording a data stream including image data and audio data on a recording medium,
First data conversion means for converting audio data of a data stream to be processed recorded on the recording medium into audio data of a predetermined format in which the data amount is compressed;
Second data conversion means for converting audio data prepared separately from the data stream to be processed into audio data of the predetermined format;
The audio data converted by the first data conversion means and the audio data converted by the second data conversion means are stored in the audio data recording area of the data stream to be processed, and the original image data Stream recording processing means for recording on the recording medium as a data stream integrated with
An information recording apparatus comprising:   2. The information recording apparatus according to claim 1, wherein the first and second data conversion means compress and convert at least one of a sampling frequency and a number of quantization bits.   The information recording apparatus according to claim 1, wherein the second data conversion unit takes in audio data before conversion from outside.   An analog audio signal input terminal and an AD conversion circuit for converting the analog audio signal into a digital signal are provided, and the second data conversion means takes in the analog audio signal input to the input terminal through the AD conversion circuit. The information recording apparatus according to claim 3.   2. The information recording apparatus according to claim 1, wherein the second data conversion means selects audio data recorded on the recording medium as audio data before conversion.   The recording medium can be randomly accessed, and data stream generation processing by the first and second data conversion means and the stream recording processing means is input to the first and second data conversion means. 6. The information recording apparatus according to claim 5, wherein the information recording apparatus is executed in a time shorter than an actual time required for reproducing audio data.   The information recording apparatus according to claim 1, wherein the information recording apparatus can be fetched from outside as the data stream to be processed.   The stream recording processing means outputs a data stream including the audio data converted by the first and second data converting means to a recording medium different from the recording medium on which the data stream to be processed is recorded. The information recording apparatus according to claim 1, wherein recording is performed. In a stream editing method for editing a data stream including video data and audio data and recording the data stream on a recording medium,
A first step in which first data conversion means converts audio data of a data stream to be processed recorded on the recording medium into audio data of a predetermined format in which the data amount is compressed;
A second step in which second data conversion means converts audio data prepared separately from the data stream to be processed into audio data of the predetermined format;
Stream recording processing means stores the audio data converted in the first step and the audio data converted in the second step in the audio data recording area of the data stream to be processed, A third step of recording on the recording medium as a data stream integral with the image data;
And a stream editing method. In a stream editing program for causing a computer to execute a process of editing a data stream including image data and audio data and recording the data stream on a recording medium,
First data conversion means for converting audio data of a data stream to be processed recorded on the recording medium into audio data of a predetermined format in which the data amount is compressed;
Second data conversion means for converting audio data prepared separately from the data stream to be processed into audio data of the predetermined format;
The audio data converted by the first data conversion means and the audio data converted by the second data conversion means are stored in the audio data recording area of the data stream to be processed, and the original image data Stream recording control means for recording on the recording medium as a data stream integral with
A stream editing program for causing the computer to function as:

Images