JP2010074558A - Video audio recording reproducing apparatus and video audio reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video audio data recording reproducing apparatus capable of outputting both video data and audio data so as to synchronize with each other even if the video data and the audio data are differently managed by frame. <P>SOLUTION: The video data and the audio data differently recorded per frame in a recording medium 11 are read by a video reading section 12 and an audio reading section 13 respectively. A control section 18 causes a storing section 115 to store a count value when the read video data reach a video buffer 17 and a count value when the read audio data reach an audio buffer 112. The control section 18 determines a delay time of each of the buffers 17 and 112 based on the count values stored in the storing section 115. Thus, the delay time of the buffers 17 and 112 can be adjusted by frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video / audio recording / reproducing apparatus and a video / audio reproducing method for reproducing video data and audio data in synchronization.

  In a system that reproduces video and audio, such as a video recorder, it is necessary to present the video and audio to the user in synchronization with the timing at which the video and audio were recorded. When the synchronization is lost, for example, in the news scene, the voice of the announcer's mouth does not match the voice (lip sync shift phenomenon), and the user feels uncomfortable.

  Conventionally, in order to prevent such a situation, a method of adding time information called a time stamp to be presented to a user to video and audio and referencing it to synchronize is taken. However, for this purpose, it is necessary to take a complicated storage format such as time-multiplexing video and audio and adding reference time information called a reference clock. Further, in the storage format used for business purposes, since video and audio are separately managed in units of frames, it is difficult to synchronize with a time stamp method.

An invention has been proposed in which video data and audio data are synchronously controlled without adding a time stamp (see, for example, Patent Document 1). However, the present invention corresponds to the case of reproducing data in which video data and audio data are encoded and multiplexed, and does not correspond to a format in which video data and audio data are managed separately.
JP-A-8-63884

  As described above, in the conventional video / audio recording / reproducing apparatus, when video data and audio data are separately managed in units of frames, it is difficult to output both data in synchronization by the time stamp method. .

  Accordingly, an object of the present invention is to provide a video / audio recording / reproducing apparatus capable of outputting both data in synchronization even when the video data and audio data are separately managed in units of frames. There is.

  In order to achieve the above object, a video / audio recording / reproducing apparatus according to the present invention comprises a recording means for separately recording video data and audio data of a video material, and a video reading means for reading out the video data from the recording means in accordance with an instruction. A video decoding means for decoding the read video data, a video buffer means for holding and outputting the decoded video data for a specified first delay time, and a recording means Voice reading means for reading the voice data in accordance with instructions, voice decoding means for decoding the read voice data, and holding and outputting the decoded voice data for a specified second delay time Audio buffer means for counting, counting means for counting external synchronization signals input from the outside and generating a count value corresponding to the frame of the video material, According to the external synchronization signal, the video reading means reads the video data and the audio reading means reads the audio data, and the video buffer means and the audio buffer means have first and second delays. Control means for designating time, wherein the control means sets the count value at the start of data input of the buffer means to which data has been inputted first among the video buffer means and the audio buffer means as a first value. The count value at the start of data input of the buffer means to which data is input later is held as a second count value among the video buffer means and the audio buffer means, and the first count The difference time at which data input is started is calculated from the value and the second count value, and the data is input first. The delay time of the buffer means is calculated from the sum of the difference time and the jitter absorption time for absorbing the jitter amount in the data transmission process by the video buffer means and the audio buffer means, and the data is input later The first and second delay times are designated by calculating the delay time of the buffer means from the jitter absorption time.

  The video / audio reproduction method according to the present invention reads out the video data and the audio data in accordance with an external synchronization signal input from the outside, from a recording means for separately recording video data and audio data of the video material, Out of the video buffer means for holding the video data and the audio buffer means for holding the audio data, the read data is first generated by counting the external synchronization signal to generate a count value corresponding to the frame of the video material. The count value at the start of data input of the buffer means input to the first is held as the first count value, and the read-out data of the video buffer means and the audio buffer means is input later The count value at the start of data input is held as a second count value, and the first count value and the first count value are stored. The difference time at which data input is started is calculated from the count value, and the delay time that the buffer means to which the data has been input first delays the data is defined as the difference time, the video buffer means and the audio buffer. Calculating the first delay time from the sum of the jitter absorption time for absorbing the amount of jitter in the data transmission process by the means, and the buffer means to which the data is input later delays the delay time of the data. The second delay time is calculated from the time.

  In the video / audio recording / reproducing apparatus and the video / audio reproducing method configured as described above, video data and audio data separately recorded in the recording unit are read out by the video reading unit and the audio reading unit, respectively. The control means holds a count value when the read video data reaches the video buffer means and a count value when the read audio data reaches the audio buffer 112. The control means determines the delay times of the video and audio buffer means based on the stored count value. Thereby, even when video data and audio data are recorded separately, it is possible to adjust the delay time of the video and audio buffer means.

  According to the present invention, it is possible to provide a video / audio recording / reproducing apparatus capable of synchronizing and outputting both data even when the video data and the audio data are separately managed in units of frames. it can.

  Embodiments of a video / audio recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overview of a video / audio recording / reproducing apparatus 10 according to an embodiment of the present invention. A camera 20 and a microphone 21 are connected to the video / audio recording / reproducing apparatus 10 in FIG. The video captured by the camera 20 and the audio recorded by the microphone 21 are taken into the video / audio recording / reproducing apparatus 10. The captured video and audio are separately recorded on the recording medium 11 in units of frames in accordance with the external synchronization signal from the synchronization signal generator 30. In addition, a speaker 42 is connected to the video / audio recording / reproducing apparatus 10 via a monitor device 40 and an amplifier 41. The video and audio recorded on the recording medium 11 are reproduced according to the external synchronization signal, the reproduced video is displayed on the monitor device 40, and the reproduced audio is amplified by the amplifier 41 and output from the speaker 42.

  FIG. 2 is a block diagram showing a functional configuration of the video / audio recording / reproducing apparatus 10 according to the embodiment of the present invention. In FIG. 2, video data and audio data of the video material recorded on the recording medium 11 are read out by the video reading unit 12 and the audio reading unit 13, respectively.

  The video data read by the video reading unit 12 is decoded by the video decoder 14 and output to the video special effect adding unit 15 and the switching unit 16. The video special effect adding unit 15 adds a special effect to the received video data and supplies it to the switching unit 16. Here, special effects in video data include character superimposition, enlargement, reduction, rotation, and the like.

  FIG. 3 is a schematic diagram illustrating the configuration of the switching unit 16. Terminal A is connected to the video special effect adding unit 15, terminal B is off, terminal C is connected to the video decoder 14, and terminal D is connected to the video buffer 17. The switching unit 16 switches the terminals A to C in accordance with an instruction from the control unit 18 and derives video data to the video buffer 17.

  When the input of the video data is started, the video buffer 17 notifies the control unit 18 to that effect. The video buffer 17 outputs the video data after delaying the output of the video data by a delay time designated by the control unit 18.

  The audio data read by the audio reading unit 13 is decoded by the audio decoder 19 and output to the audio special effect adding unit 110 and the switching unit 111. The audio special effect adding unit 110 adds a special effect to the received audio data and supplies it to the switching unit 111.

  The switching unit 111 has the same configuration as that of the switching unit 16, switches the terminals A to C in accordance with instructions from the control unit 18, and derives audio data to the audio buffer 112.

  When the input of audio data is started, the audio buffer 112 notifies the control unit 18 to that effect. The audio buffer 112 delays the output of the audio data by the delay time designated by the control unit 18 and then outputs this audio data.

  The jitter absorber 113 receives the external synchronization signal, smooths the jitter included in the external synchronization signal in time, and suppresses a rapid change. The jitter absorber 113 supplies the external synchronization signal that has absorbed the jitter to the controller 18 and the frame counter 114. In addition, the jitter absorbing unit 113 notifies the control unit 18 of the amount of jitter that could not be absorbed as a jitter amount. The frame counter 114 counts the external synchronization signal and generates a count value corresponding to the frame of the video material.

  The control unit 18 includes a CPU (Central Processing Unit) such as a microprocessor, and performs various controls in the video / audio recording / reproducing apparatus 10.

  When there is a reproduction instruction from the outside, the control unit 18 causes the video reading unit 12 and the audio reading unit 13 to simultaneously read the video data and the audio data.

  Further, the control unit 18 monitors whether there is a notification from the video buffer 17 and the audio buffer 112. When receiving the notifications from the video buffer 17 and the audio buffer 112, the control unit 18 holds the count value of the frame counter 114 in the holding unit 115 every time these notifications are received. The control unit 18 determines the difference between the arrival time of the video and the audio from the count value when the notification is received from the buffer where the input is started first and the count value when the notification is received from the buffer where the input is started later. Time Td is calculated.

  The control unit 18 also determines the jitter absorption time Tv of the video buffer 17 from the jitter amount of the video reading unit 12, the jitter amount of the video decoder 14, the jitter amount of the video special effect adding unit 15, and the jitter amount from the jitter absorption unit 113. Is calculated. The control unit 18 also determines the jitter absorption time Ta of the audio buffer 112 from the jitter amount of the audio reading unit 13, the jitter amount of the audio decoder 19, the jitter amount of the audio special effect adding unit 110, and the jitter amount of the jitter absorption unit 113. Is calculated. Then, the control unit 18 sets the larger value of the jitter absorption times Tv and Ta as Tjit. Note that the jitter amounts of the reading units 12 and 13, the jitter amounts of the decoders 14 and 19, and the jitter amounts of the special effect addition units 15 and 110 when calculating the jitter absorption time are jitter amounts estimated in advance at the time of designing the apparatus. .

  Then, the control unit 18 designates, as a delay time, a time obtained by adding the difference time Td between the arrival time of video and audio to the jitter absorption time Tjit for the buffer from which data input has been started. In addition, the control unit 18 designates the jitter absorption time Tjit as a delay time for a buffer that has started to input data later.

  In addition, when an instruction to add a special effect to data or an instruction to stop adding a special effect to data is input to the audio / video recording / playback apparatus, the control unit 18 inputs to the buffers 17 and 112. The switching units 16 and 111 are controlled to maintain the frame order of the derived data.

  When the special reproduction including fast forward or reverse reproduction is instructed to the video / audio recording / reproducing apparatus, the control unit 18 uses the jitter absorption time shorter than the calculated jitter absorption time Tjit to use the buffers 17, 112. Determine the delay time.

  Further, when an instruction to delay the output of data from the buffers 17 and 112 is input to the audio / video recording / reproducing device, the control unit 18 stores the data recorded on the recording medium 11 in the reading units 12 and 13. Duplicate reading is performed for the specified number of frames.

  For example, if the video displayed on the monitor device 40 is earlier than the audio output from the speaker 42, the user inputs an instruction to the video / audio recording / reproducing device 10 to delay the output of the video data by two frames. Upon receiving this instruction, the control unit 18 causes the video reading unit 12 to read the video data by duplication for two frames. As a result, the video data output from the video buffer 17 is delayed by two frames compared to the audio data, and the video displayed on the monitor device 40 and the audio output from the speaker 42 are synchronized.

  Next, the processing operation of the video / audio recording / reproducing apparatus having the above-described configuration will be described. FIG. 4 is a flowchart showing a processing operation by the control unit 18 according to the embodiment of the present invention. Here, a case will be described in which the input of video data to the video buffer 17 is started before the input of audio data to the audio buffer 112 is started.

  First, when receiving a reproduction instruction from the outside, the control unit 18 instructs the video reading unit 12 and the audio reading unit 13 to simultaneously read the video data and the audio data (step 4a).

  Subsequently, the control unit 18 determines whether or not there is a notification from the buffer from which data input has been started (step 4b). When receiving the notification from the video buffer 17 (Yes in Step 4b), the control unit 18 holds the count value Nv of the frame counter 114 at that time (Step 4c).

  The control unit 18 determines whether or not there is a notification from the buffer from which data input is started later (step 4d). When receiving the notification from the audio buffer 112 (Yes in Step 4d), the control unit 18 holds the count value Na of the frame counter 114 at that time in the holding unit 115 (Step 4e).

  The control unit 18 calculates the jitter absorption time Tjit using the jitter amount from the jitter absorption unit 113, and calculates the difference time Td between the arrival times of the video and audio from the difference between the count value Nv and the count value Ns. (Step 4f). When the jitter absorption time Tjit and the difference time Td are calculated, the control unit 18 designates the jitter absorption time Tjit + the difference time Td as a delay time in the video buffer 17, and sets the jitter absorption time Tjit as a delay time in the audio buffer 112. Designation is made (step 4g), and the process is terminated.

  5 to 7 are schematic diagrams for explaining the switching control of the switching units 16 and 111 by the control unit 18. Here, the addition of special effects to video data will be described as an example. Further, in this description, it is assumed that a processing delay of 2 frames occurs when a special effect is added to video data.

  FIG. 5 shows switching control when a special effect is added to video data. First, the switching unit 16 derives the video data from the video decoder 14 to the video buffer 17.

  When the video reading unit 12 reads the video data of frame 1, when an instruction to add a special effect to the video data is input to the video / audio recording / reproducing apparatus, the control unit 18 controls the video reading unit 12. The video decoder 14 is instructed to process the video data of frames 2 to 5 at double speed. Note that the amplification factor of the processing speed at this time and the number of processing frames at the amplified processing speed are determined by the processing delay amount due to the addition of the special effect. The video data that has been double-speed processed by the video decoder 14 is held in the video buffer 17 and output at a single output speed. For this reason, the delay amount in the video buffer 17 temporarily increases.

  When the video data of the frame 5 is derived to the video buffer 17, the control unit 18 switches the connection of the switching unit 16 to the B terminal and turns off signal derivation. During this time, supply of video data to the video buffer 17 is stopped. On the other hand, since video data is output from the video buffer 17 at a normal output speed, the delay amount of the video buffer 17 decreases and returns to the original amount.

  The control unit 18 switches the connection of the switching unit 16 to the B terminal, and when two frames have elapsed, the control unit 18 switches the connection of the switching unit 16 to the A terminal. As a result, the video data of the frame 6 ′ with the special effect added from the frame 5 is derived to the video buffer 17.

  In this way, even when switching to the output of video data to which a special effect is added, the video data can be derived to the video buffer 17 without disturbing the frame configuration.

  6 and 7 show switching control when stopping the addition of special effects to video data. FIG. 6 shows switching control when the processing speed of the video reading unit 12 and the video decoder 14 is changed to less than 1 time. First, the switching unit 16 derives the video data from the video special effect adding unit 15 to the video buffer 17.

  When the video reading unit 12 reads the video data of the frame 6 and the instruction to stop adding the special effect to the video data is input to the video / audio recording / reproducing apparatus, the control unit 18 The read unit 12 and the video decoder 14 are instructed to process the video data of the frames 7 and 8 by a factor of 1/2. Note that the attenuation factor of the processing speed at this time and the number of processing frames at the attenuated processing speed are determined by the processing delay amount due to the addition of the special effect.

  When the video data of the frame 7 ′ is derived to the video buffer 17, the control unit 18 switches the connection of the switching unit 16 to the C terminal. As a result, the video data of the frame 8 to which no special effect is added is derived to the video buffer 17 with the frame 7 ′ as a boundary.

  FIG. 7 shows switching control when the reading operation of the video reading unit 12 is stopped. First, the switching unit 16 derives the video data from the video special effect adding unit 15 to the video buffer 17.

  When the video reading unit 12 reads the video data of the frame 7 and the instruction to stop adding the special effect to the video data is input to the video / audio recording / reproducing apparatus, the control unit 18 An instruction is issued to the reading unit 12 to stop the reading operation.

  When two frames elapse after the reading operation of the video reading unit 12 is stopped, the control unit 18 restarts the reading operation and switches the connection of the switching unit 16 to the terminal C. At this time, the number of frames for which the reading operation is stopped is determined by the amount of processing delay due to the addition of a special effect. As a result, the video data of the frame 8 to which no special effect is added is derived to the video buffer 17 with the frame 7 ′ as a boundary.

  In this way, even when the addition of the special effect to the video data is stopped, the video data can be derived to the video buffer 17 without disturbing the frame configuration.

  As described above, in the above-described embodiment, the arrival of video data and audio data from the count value when video data reaches the video buffer 17 and the count value when audio data reaches the audio buffer 112. Calculate the time difference. For buffers where data has arrived first, the sum of the difference time and jitter absorption time is used as the buffer delay time. For buffers where data arrives later, the jitter absorption time is used as the buffer delay time. ing. Thereby, even when the video data and the audio data are recorded separately, the delay times of the buffers 17 and 112 can be adjusted in units of frames.

  Therefore, according to the present invention, even when video data and audio data are separately managed in units of frames, both data are output in synchronization without performing complicated processing such as time stamps. It is possible to provide a video / audio recording / reproducing apparatus capable of performing the above.

  In the above embodiment, the jitter absorption time Tjit is calculated with reference to the jitter amount that could not be absorbed by the jitter absorber 113. Conventionally, since the jitter of the external synchronization signal is estimated for the entire system and the jitter absorption time is calculated using the jitter amount of the entire system, the buffer delay time is unnecessarily large. On the other hand, in the video / audio recording / reproducing apparatus according to the present invention, the jitter absorption time is calculated by referring to the jitter amount that could not be absorbed by the jitter absorption unit 113, so that the minimum required for the buffers 17 and 112 is obtained. The delay time can be set. Therefore, the video / audio recording / reproducing apparatus according to the present invention can improve an operation response to an execution process such as a reproduction process.

  In the above embodiment, when adding special effects to the data, the processing speed of the reading units 12 and 13 and the decoders 14 and 19 is amplified for a predetermined period, and the data frame derived to the buffers 17 and 112 is obtained. The switching units 16 and 111 are switched so as not to disturb the structure. When stopping the addition of special effects to data, the processing speed of the reading units 12 and 13 and the decoders 14 and 19 is attenuated / stopped for a predetermined period, and the frame structure of the data derived to the buffers 17 and 112 is obtained. The switching units 16 and 111 are switched so as not to disturb. As a result, even when a special effect is added to the data and when the addition of the special effect to the data is stopped, the reproduction can be continued while maintaining the synchronization of the video and audio. Therefore, even when a special effect is added, it is not necessary to re-synchronize the video and audio, and it is possible to confirm the on / off effect of the special effect while continuing the reproduction.

  Further, by operating the processing speeds of the reading units 12 and 13 and the decoders 14 and 19, it is possible to maintain the delay amounts of the buffers 17 and 112 in a steady state at a constant value. Therefore, the video / audio recording / reproducing apparatus according to the present invention stabilizes the output of video data and audio data against the jitter of the external synchronization signal.

  Further, in the above-described embodiment, when special playback including fast forward or reverse playback is instructed to the video / audio recording / playback apparatus, the buffer 17, the jitter absorption time shorter than the calculated jitter absorption time Tjit is used. A delay time of 112 is determined. It can be assumed that the use time of special reproduction is shorter than the use time of normal reproduction. Therefore, it is not always necessary to maintain lip sync in special playback. Therefore, the video / audio recording / reproducing apparatus according to the present invention improves the operation response at the time of special reproduction by determining the delay time of the buffers 17 and 112 using the jitter absorption time smaller than the calculated value at the time of special reproduction. Realized.

  Furthermore, in the above-described embodiment, when an instruction to delay the output of data from the buffers 17 and 112 is input to the video / audio recording / reproducing apparatus, the data recorded in the recording medium 11 in the reading units 12 and 13 Are redundantly read by the number of designated frames. As a result, the delay times of the buffers 17 and 112 can be dynamically adjusted individually. Therefore, even if the monitor device 40 and the speaker 42 have a specific delay amount and the video displayed on the monitor device 40 and the audio output from the speaker 42 are not synchronized, the video or By intentionally shifting the output from the audio buffers 17 and 112, the video displayed on the monitor device 40 and the audio output from the speaker 42 can be synchronized.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, an example in which the special effect is turned on / off for the video data has been described. However, the special effect for the audio data can be similarly implemented.

  In the above-described embodiment, the example in which the input of the video data to the video buffer 17 is started before the input of the audio data to the audio buffer 112 is started. Even if the input of the audio data to the audio buffer 112 is started before the input to is started, it can be similarly implemented.

  Furthermore, the present invention can be embodied by modifying the constituent elements without departing from the spirit of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

1 is an overview of a video / audio recording / reproducing apparatus according to an embodiment of the present invention. It is a block diagram which shows the function structure of the video / audio recording / reproducing apparatus of FIG. It is a figure which shows the structure of the switching part of FIG. It is a flowchart which shows the processing operation by the control part of FIG. It is a figure explaining the switching control of the switching part by the control part of FIG. It is a figure explaining the switching control of the switching part by the control part of FIG. It is a figure explaining the switching control of the switching part by the control part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Audio / video recording / reproducing apparatus 11 ... Recording medium 12 ... Video reading part 13 ... Audio | voice reading part 14 ... Video decoder 15 ... Video special effect addition part 16 ... Switching part 17 ... Video buffer 18 ... Control part 19 ... Audio decoder 110 ... Audio special effect adding unit 111 ... switching unit 112 ... audio buffer 113 ... jitter absorbing unit 114 ... frame counter 115 ... holding unit 20 ... camera 21 ... microphone 30 ... synchronizing signal generator 40 ... monitor device 41 ... amplifier 42 ... speaker

Claims (16)

Recording means for separately recording video data and audio data of the video material;
Video reading means for reading the video data from the recording means according to an instruction;
Video decoding means for decoding the read video data;
Video buffer means for holding and outputting the decoded video data for a specified first delay time;
Voice reading means for reading the voice data from the recording means according to instructions;
Voice decoding means for decoding the read voice data;
Audio buffer means for holding and outputting the decoded audio data for a specified second delay time;
Count means for counting external synchronization signals input from the outside and generating a count value corresponding to the frame of the video material;
According to the external synchronization signal, the video reading unit reads the video data and the audio reading unit reads the audio data, and the video buffer unit and the audio buffer unit have first and second delays. Control means for designating time,
The control means includes
Of the video buffer means and the audio buffer means, the count value at the start of data input of the buffer means to which data has been input first is held as a first count value,
Of the video buffer means and the audio buffer means, the count value at the start of data input of the buffer means to which data is input later is held as a second count value,
Calculating a difference time at which data input is started from the first count value and the second count value;
The delay time of the buffer means to which the data is input first is calculated from the sum of the difference time and the jitter absorption time for absorbing the jitter amount in the data transmission process by the video buffer means and the audio buffer means. The video / audio recording / reproducing apparatus is characterized in that the first and second delay times are specified by calculating from the jitter absorption time the delay time of the buffer means to which the data is input later. When special playback including fast forward or reverse playback is instructed,
2. The video / audio recording / reproducing apparatus according to claim 1, wherein the control means designates the first and second delay times by reducing the jitter absorption time from a jitter absorption time during standard reproduction. . When the jitter absorption time is a time for absorbing the jitter amount from the reading of the data recorded in the recording means until the data reaches the buffer means and the jitter amount of the external synchronization signal,
It absorbs the jitter amount of the external synchronization signal, and further comprises a jitter absorption means for notifying the control means of the jitter amount that cannot be absorbed if it cannot be absorbed,
The video / audio recording / reproducing apparatus according to claim 1, wherein the control unit calculates the jitter absorption time with reference to the notified jitter amount. Video special effect adding means for adding a special effect to the decoded video data;
First switching means for receiving the video data from the video decoding means and the video data from the video special effect adding means and deriving the received video data in accordance with an instruction from the control means;
The video / audio recording / reproducing apparatus according to claim 1, wherein the control unit switches and controls the first switching unit. When the addition of the special effect is instructed to the video data when each data is output from the video and audio buffer means,
The control means increases the processing speed of the video reading means and the video decoding means by a specified number of frames in accordance with a preset delay frame generated by adding the special effect, and the first switching means 5. The video / audio recording / reproducing apparatus according to claim 4, wherein the delay frame due to the addition of the special effect is canceled by switching control. When it is instructed to stop adding the special effect in the video data when each data is output from the video and audio buffer means,
The control means delays the processing speed of the video reading means and the video decoding means by a specified number of frames according to a preset delay frame generated by the addition of the special effect, and the first 5. The video / audio recording / reproducing apparatus according to claim 4, wherein the switching means is controlled to cancel the delay frame. When it is instructed to stop adding the special effect in the video data when each data is output from the video and audio buffer means,
The control means stops the video reading means for a designated number of frames in accordance with a preset delay frame generated by the addition of the special effect, and switches the first switching means to control the switching. 5. The video / audio recording / reproducing apparatus according to claim 4, wherein the delayed frames are canceled out. When there is an instruction to delay the output of the video data by a specified number of frames,
2. The video / audio recording / reproducing apparatus according to claim 1, wherein the control unit causes the video reading unit to repeatedly read the same video data by the designated number of frames. Voice special effect adding means for adding a special effect to the decoded voice data;
A second switching means for receiving the voice data from the voice decoding means and the voice data from the voice special effect adding means, and deriving the received voice data in accordance with an instruction from the control means;
The video / audio recording / reproducing apparatus according to claim 1, wherein the control unit switches and controls the second switching unit. When the addition of the special effect is instructed to the audio data when each data is output from the video and audio buffer means,
The control means increases the processing speed of the voice reading means and the voice decoding means by a specified number of frames in accordance with a preset delay frame generated by the addition of the special effect, and the second switching means The video / audio recording / reproducing apparatus according to claim 9, wherein the delay frame due to the addition of the special effect is canceled by switching control. When stopping the addition of the special effect in the audio data when each data is being output from the video and audio buffer means,
The control means delays the processing speed of the voice reading means and the voice decoding means by a specified number of frames according to a preset delay frame generated by the addition of the special effect, and the second The video / audio recording / reproducing apparatus according to claim 9, wherein the delay frame is canceled by switching control of the switching means. When stopping the addition of the special effect in the audio data when each data is being output from the video and audio buffer means,
The control means stops the voice reading means for a designated number of frames according to a preset delay frame generated by the addition of the special effect, and controls the second switching means to switch the second switching means. The video / audio recording / reproducing apparatus according to claim 9, wherein the delayed frames are canceled out. When there is an instruction to delay the output of the audio data by a specified number of frames,
2. The video / audio recording / reproducing apparatus according to claim 1, wherein the control unit causes the audio reading unit to repeatedly read the same audio data by the designated number of frames. From the recording means for separately recording the video data and the audio data of the video material, the video data and the audio data are read according to the external synchronization signal input from the outside,
Count the external synchronization signal to generate a count value corresponding to the frame of the video material,
Of the video buffer means for holding the video data and the audio buffer means for holding the audio data, the count value at the start of data input of the buffer means to which the read data is input first is set to a first count. Hold as value,
Of the video buffer means and the audio buffer means, the count value at the start of data input of the buffer means to which the read data is input later is held as a second count value,
Calculating a difference time at which data input is started from the first count value and the second count value;
The buffer means to which the data is first input delays the data, the difference time, and the jitter absorption time for absorbing the jitter amount in the data transmission process by the video buffer means and the audio buffer means As the first delay time from the sum of
A video / audio reproduction method, wherein the buffer means to which the data is input later calculates a delay time for delaying the data as a second delay time from the jitter absorption time. When special playback including fast forward or reverse playback is instructed,
15. The video / audio reproduction method according to claim 14, wherein the first and second delay times are calculated by reducing the jitter absorption time from a jitter absorption time during standard reproduction. When the jitter absorption time is a time for absorbing the jitter amount from the reading of the data recorded in the recording means until the data reaches the buffer means and the jitter amount of the external synchronization signal,
15. The video / audio reproduction method according to claim 14, wherein when the jitter of the external synchronization signal is absorbed and cannot be absorbed, the jitter absorption time is calculated with reference to the jitter amount that cannot be absorbed.

Images