WO2008050427A1

WO2008050427A1 - Information data receiving device, information data receiving method, information data receiving program and recording medium with information data receiving program stored therein

Info

Publication number: WO2008050427A1
Application number: PCT/JP2006/321355
Authority: WO
Inventors: Seiji Harada
Original assignee: Pioneer Corporation
Priority date: 2006-10-26
Filing date: 2006-10-26
Publication date: 2008-05-02
Also published as: JP4820877B2; JPWO2008050427A1

Abstract

When a PES packet holds a plurality of frame data, the PES packet is divided into a plurality of TS packets, and its part is omitted, the omitted frames are complimented by other TS packets, so that it prevents a state in which data are not reproduced for every PES packet unit.

Description

Specification

Information data receiving apparatus, information data receiving method, information data receiving program, and recording medium storing information data receiving program

Technical field

[0001] The present invention relates to an information data receiving apparatus, an information data receiving method, an information data receiving program, and a recording medium storing the information data receiving program.

Background art

[0002] MPE G (Moving Picture Experts Group) is known as an encoding method for encoding audio and moving images when digitized and transmitted.

[0003] In MPEG, in addition to audio and video encoding schemes, each bit stream as information data such as encoded video, audio, and additional data is multiplexed and transmitted while synchronizing with each other. MPEG system is specified as a playback method!

[0004] In an MPEG system, each encoded bit stream is stored in a packet called a PES (Packetized Elementary Stream) packet. Figure 1 shows the structure of the PES packet. A PES packet is a variable-length packet consisting of a PES packet header containing time information called PTS (Presentation Time Stamp) and a PES packet payload that stores encoded data such as audio and video. .

[0005] Then, the PES packet is divided into packets that are divided into fixed lengths called TS (Transport Stream) packets and output to a transmission line or the like. On the receiving side, the PES packet is restored from the received TS packet, the PES packet payload power is also extracted based on the time information such as PTS extracted from the PES packet header by extracting the code data such as voice and video. Decrypt and play.

[0006] In such transmission by the MPEG system, data may be lost or unintentionally changed during transmission on a wireless or wired transmission path. In that case, it is recognized as an error on the receiving side, and the data is discarded or interpolated. As a method for dealing with the receiving side when an error occurs, for example, the information described in Patent Document 1 is used. Receiving device for information transmission system has been proposed! Speak.

[0007] The receiver of the information data transmission system described in Patent Document 1 compares the PTS inserted in the PES packet with the PTS inserted in the previous PES packet, and Judgment is made on whether or not there is a missing part, and if a missing part is detected, the audio data for the missing PES packet is interpolated.

Patent Document 1: Japanese Patent Laid-Open No. 2001-111610

Disclosure of the invention

Problems to be solved by the invention

[0008] The receiving device of the information data transmission system described in Patent Document 1 described above determines the missing PES packet from the PTS and interpolates in units of PES. For example, in the case of voice data, the missing PES packet If there are too many frames, the audio may be interrupted during playback or the sound may become unnatural.

[0009] Therefore, the present invention provides information that can minimize the influence of errors during reproduction even if errors due to missing or changed data occur when audio or video is transmitted in an MPEG system, for example. It is an object of the present invention to provide a data receiving apparatus, an information data receiving method, an information data receiving program, and a recording medium storing an information data receiving program.

Means for solving the problem

[0010] In order to solve the above problem, the invention according to claim 1 is characterized in that a minimum code key unit to which time information for decoding and reproduction is added and the time information are added. Further, receiving means for receiving information data in which the minimum coding unit is mixed, decoding means for decoding the information data received by the receiving means for each minimum coding unit, and the decoding means In the information data receiving apparatus having the reproducing means for reproducing the decoded data, the minimum coding code is detected when the decoding means detects an error when decoding the minimum coding unit. Interpolating means for generating interpolated data for a unit time, causing the reproducing means to output the interpolated data generated by the interpolating means instead of the information data of the minimum coding unit in which an error is detected, and Interpolated data After been output, the decoding continues ChikaraTsuta the minimum code I 匕単 position such errors are detected And control means for causing the reproducing means to decrypt and output to the reproducing means.

[0011] The invention according to claim 4 includes a minimum coding unit to which time information for decoding and reproduction is added, and the minimum code key unit to which the time information is added. In the information data receiving method of receiving information data in which the mixed information is received, decoding the received information data for each of the minimum coding units, and reproducing the decoded decoded data, the minimum coding unit is set. If an error is detected during decoding, interpolated data for the time of the minimum coding unit is generated, and the interpolated data is reproduced instead of the information data of the minimum coding unit in which the error is detected, Then, after the interpolation data is output, control is performed such that the minimum code unit that has been detected without error is continuously decoded and reproduced.

[0012] The invention according to claim 7 includes a minimum coding unit to which time information for decoding and reproduction is added, and the minimum code key unit to which the time information is added. Receiving means for receiving mixed information data, decoding means for decoding the information data received by the receiving means for each minimum code unit, and decoding by the decoding means In an information data reception program that causes a computer to function as a playback unit that plays back decoding data, if the decoding unit detects an error when decoding the minimum coding unit, the minimum code Interpolating means for generating interpolated data for the time of the encoding unit, causing the reproducing means to output the interpolated data generated by the interpolating means instead of the information data of the minimum coding unit in which an error is detected, and Supplement After the data is output, the computer functions as a control unit that continuously decodes the minimum code unit that has not been detected an error by the decoding unit and outputs it to the reproduction unit. It is characterized by making it.

Brief Description of Drawings

FIG. 1 is an explanatory diagram of a PES packet in the prior art.

FIG. 2 is a block diagram of an information data receiving apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram of an audio decoder of the information data receiving apparatus shown in FIG.

FIG. 4 is a flowchart for explaining the operation of the audio decoder. FIG. 5 is an explanatory diagram showing input and output of the audio decoder.

FIG. 6 is an explanatory diagram showing input and output of the audio decoder.

Explanation of symbols

[0014] 100 information data receiving apparatus

101 TS demultiplexer (receiving means)

103 audio decoder

105 DZA converter (reproduction means)

201 Audio decoding control unit (control means)

202 Interpolation data generator (interpolation means)

203 Audio decoding part (Decoding means)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an information data receiving apparatus according to an embodiment of the present invention will be described. The information data receiving apparatus according to an embodiment of the present invention generates interpolation data for a time corresponding to the minimum coding unit by the interpolation unit when the decoding unit detects an error when decoding the minimum coding unit. Then, the interpolated data is output to the reproducing means by the control means in place of the decoded key data in the smallest code unit in which an error is detected. Then, after the interpolation data generated by the interpolation means is output, the strongest code key unit in which no error is detected is continuously decoded by the decoding means and output to the reproducing means. In this way, information data can be interpolated when an error occurs regardless of the presence or absence of time information, and then decoding in units of minimum codes can be continued immediately. Therefore, since the interpolation is performed immediately when an error occurs in the minimum coding unit, the influence of the error can be minimized.

[0016] Further, the control means may detect the missing of the minimum coding unit from the time information, cause the interpolation means to generate information data for the missing time, and output it to the reproduction means. By doing so, interpolation for the missing time can be performed at the time when time information is detected after interpolation of the smallest sign key unit, so that the time axis deviation at the time of reproducing information data can be reduced. .

[0017] Further, the control means may determine the number of interpolations and the number of interpolations in units of the least sign of the previous time information power. It is also possible to detect the missing of the minimum coding unit by comparing the time calculated from the number of signals and the currently detected time information. In this way, the time is also calculated in advance for the number of interpolations and the number of decoding keys in the smallest code unit of the previous time information power, and the minimum code signal to which the time information of the current time is added. If a comparison is made at the time when the 匕 unit is detected, it is possible to easily detect the missing of the smallest sign 匕 unit.

[0018] Also, the information data receiving method according to an embodiment of the present invention generates interpolation data for a time corresponding to the minimum coding unit when an error is detected when decoding the minimum coding unit. Then, the interpolated data is output in place of the decoded key data of the smallest code key unit in which the error is detected. Then, after the interpolation data is output, the minimum coding unit without error is continuously decoded and reproduced. In this way, information data can be interpolated when an error occurs regardless of the presence or absence of time information, and thereafter, decoding in units of minimum code units can be continued immediately. Therefore, since the interpolation is performed immediately when an error occurs in the minimum coding unit, the influence of the error can be minimized.

[0019] Further, it is possible to detect missing of the minimum coding unit from the time information, and generate and reproduce information data for the missing time. In this way, interpolation for the missing time can be performed when time information is detected after interpolation of the minimum coding unit, so that the time axis deviation during information data reproduction can be reduced. it can.

[0020] In addition, the number of interpolations and the decoding power of the smallest sign key unit of the previous time information power are calculated and the currently detected time information is compared to determine whether the minimum coding unit is missing. It may be detected. In this way, the time is calculated in advance from the number of interpolations and the number of decoding keys in units of the minimum sign of the previous time information power, and the minimum time value with the current time information added. If the comparison is made at the time when the sign key unit is detected, it is possible to easily detect the lack of the minimum sign key unit.

[0021] Also, the information data receiving program according to one embodiment of the present invention provides a time corresponding to the minimum coding unit when the decoding unit detects an error when decoding the minimum code key unit. Interpolated data is generated by the interpolating means, and the interpolating data is output to the reproducing means in place of the decoded data of the smallest code unit in which the error is detected, and the interpolating data is then interpolated. After the data is output, the computer is caused to function so that the decoding unit continuously decodes and outputs to the reproducing unit the strongest code unit in which no error is detected. In this way, the information data can be interpolated when an error occurs regardless of the presence or absence of time information, and then decoding in units of minimum codes can be continued immediately thereafter. Therefore, since the interpolation is performed immediately when an error occurs in units of the minimum sign key, the influence of the error can be minimized.

[0022] It is also possible to detect the missing of the minimum coding unit from the time information, generate information data for the missing time in the interpolating means, and output it to the reproducing means. By doing so, it is possible to perform the interpolation for the missing time when the time information is detected after the interpolation of the minimum sign unit, so that the time axis deviation at the time of reproducing the information data can be reduced. it can

[0023] In addition, the minimum number of coding units is compared by comparing the calculated number of interpolations and decoding powers of the previous time information power with the currently detected time information. It may be detected. In this way, the time is calculated in advance from the number of interpolations and the number of decoding keys in units of the minimum sign of the previous time information power, and the minimum time value with the current time information added. If the comparison is made at the time when the sign key unit is detected, it is possible to easily detect the lack of the minimum sign key unit.

[0024] Further, the information data receiving program according to any one of claims 7 to 9 may be stored in a recording medium. In this way, the information data receiving program can be distributed as a single unit in addition to being incorporated into the device.

Example

An information data receiving apparatus 100 according to one embodiment of the present invention will be described with reference to FIGS. The information data receiving device 100 is a device that receives a bit stream as information data input from an input terminal, extracts audio data, decodes it, and reproduces it. As shown in FIG. 2, the information data receiving apparatus 100 includes a TS demultiplexer 101, an audio input buffer 102, an audio decoder 103, an audio output buffer 104, a DZA converter 105, and a speaker 106. .

[0026] The TS demultiplexer 101 as a receiving means has a TS format input from an input terminal. Restores PES packet from bit stream, extracts voice data, detects PTS as time information from PES packet header and detects error of voice data, and outputs PTS and error detection information to voice input buffer 102 along with voice data To do. At this time, the PTS outputs the error detection information so as to be aligned with the error detection position of the audio data so that it is aligned with the beginning of the audio data of the PES packet.

The audio input buffer 102 accumulates the audio data, PTS, and error detection information input from the TS demultiplexer 101, and outputs the audio data, PTS, and error information in response to a request from the audio decoder 103.

The audio decoder 103 decodes the audio data read from the audio input buffer 102 and outputs it to the audio output buffer 104. If there is error detection information, the audio data is interpolated based on the decoding result and PTS.

In the audio decoder 103, as shown in FIG. 3, an audio decoding control unit 201, an interpolation data generation unit 202, an audio decoding unit 203, and a selector 204 are also configured.

[0030] The audio decoding control unit 201 as the control means reads out from the audio input buffer 102 for each frame as a minimum code unit which is a decoding processing unit. If the read frame has a PTS, calculate the time from the PTS and the number of frames decoded or interpolated from the PTS output immediately before, and detect missing frames from that time. When error detection information is attached to the read frame, or when a missing frame is detected from the PTS or when an error has been notified from the audio decoding unit 203, the interpolation data generation unit 202 generates interpolation data. Instruct. If no frame error is detected from the error detection or PTS, the frame is output to the audio decoding unit 203. Further, the selector 204 is switched depending on which of the interpolation data generation unit 202 and the audio decoding unit 203 has been instructed to process.

[0031] In response to an instruction from the audio decoding control unit 201, the interpolation data generating unit 202 as an interpolating unit refers to the result of the audio decoding unit 203, and adds complementary data for error frames and missing frames. Generate for frame time and output to selector 204.

[0032] The audio decoding unit 203 as decoding means decodes the frame data input from the audio decoding control unit 201 and outputs the decoded data to the selector 204. Decode error during decoding When one occurs, the decoding process is stopped and the audio decoding control unit 201 is output that a decoding error has occurred.

The selector 204 is in response to an instruction from the audio decoding control unit 201. Output either one of the interpolation data generation unit 202 or the audio decoding unit 203 to the audio output buffer 104

. If the output frame has a PTS, the PTS is also output.

The operation of the audio decoder 103 will be described with reference to the flowchart of FIG.

[0035] First, in step S101, the number of interpolations and the number of frames as the number of decodes counted in the audio decoding control unit 201 are cleared to 0, and the process proceeds to step S102.

Next, in step S102, the audio decoding control unit 201 reads audio data, PTS, and error detection information for each frame from the audio input buffer 102, and proceeds to step S103.

[0037] Next, in step S103, it is determined whether or not the data read by the audio decoding control unit 201 has a PTS. If there is a PTS (in the case of Y), the process proceeds to step S110. If yes (N), go to Step S104.

Next, in step S104, it is determined whether or not the data read by the audio decoding control unit 201 has error detection information. If there is error detection information (in the case of Y), the process proceeds to step S107. If not (N), go to Step S105.

[0039] Next, in step S105, the data of the frame read by the audio decoding unit 203 is decoded, and the process proceeds to step S106.

[0040] Next, in step S106, the audio decoding unit 203 determines whether an error has occurred during decoding. If an error has occurred (in the case of Y), the process proceeds to step S107; If N), go to step S108.

[0041] Next, in step S107, if the error is included in the data read from the audio input buffer 102 or a decoding error is generated from the audio decoding unit 203, the audio decoding control unit 201 executes the interpolation data generating unit. The interpolation data for one frame time is generated in 202, and the process proceeds to step S108. One frame time is obtained from the input bit stream, and the interpolation method may be, for example, to output the previous frame again, or the interpolation data based on a plurality of past frame data. You can make it generate. Next, in step S108, the audio decoding control unit 201 switches the selector 204 to output the decoded or interpolated audio data and PTS to the audio output buffer 104, and the process proceeds to step S109.

Next, in step S109, the number of frames in the audio decoding control unit 201 is incremented, and the process returns to step S102.

[0044] In step S110, the audio decoding control unit 201 is greater than the value obtained by multiplying the PTS obtained immediately before the PTS force obtained in step S103 and the number of frames counted in the audio decoding control unit 201 by one frame time. If it is larger (in the case of Y), the process proceeds to step S111, and if not (in the case of N), the process proceeds to step S114. In other words, a frame loss is detected by comparing the time when the number of interpolations and decoding power of the frame from the previous PTS are calculated with the currently detected PTS.

[0045] Next, in step S111, the PTS detected in step S103 is larger than the PTS obtained immediately before and the number of frames counted in the audio decoding control unit 201 multiplied by one frame time. The audio decoding control unit 201 causes the interpolation data generation unit 202 to generate interpolation data for one frame time and proceeds to step S112. In one frame time, the input bit stream power is acquired, and the interpolation method may be to output the previous frame again, for example, based on a plurality of past frame data! / Interpolation data may be generated.

Next, in step S112, the audio decoding control unit 201 switches the selector 204 to output the interpolated audio data and PTS to the audio output buffer 104, and the process proceeds to step S113.

Next, in step S113, the number of frames in the audio decoding control unit 201 is incremented, and the process returns to step S110.

In step S114, the number of frames in the audio decoding control unit 201 is cleared to 0, and the process proceeds to step S104.

Here, an example of the operation according to the flowchart described above will be described with reference to FIGS.

[0050] First, FIG. 5 is a diagram in which a part of the bit stream input to the information data receiving apparatus 100 is extracted. Input frame sequence is input in order from frame 1, frame 1 is the previous This is an example in which the last PES packet is shown, the PES packet is composed of frames 2 through 6, and the next PES packet is shown from frame 7. As shown in Fig. 5, PTS is added to frames 2 and 7, which are the first frames of the PES packet. The following explanation focuses on PES packets including frames 2-6.

[0051] In FIG. 5, if an error was detected during decoding at frame 3, and error detection information was included when the frame data was read at frame 5, first the frame 2 at the beginning of the PES packet In this case, the process proceeds to steps S102 and S103, and the PTS is attached, so if there is no error in the previous PES packet, the process proceeds to steps S114, S104, S105, S106, and S108. The audio data is output, the process proceeds to step S109, the number of frames is set to 1, and the process returns to step S102. In step S102, frame 3 is read, and the process proceeds to step S103, step S104, step S105, and step S106.An error is detected and the process proceeds to step S107, where interpolation data is generated for one frame time. Proceed to step S109, set the number of frames to 2, and return to step S102. In step S102, frame 4 is read, and the process proceeds to step S103, step S104, step S105, step S106, step S108, and step S109. The number of frames is set to 3, and the process returns to step S102.

[0052] Subsequently, frame 5 is read in step S102, and the process proceeds to step S103 and step S104. Since error detection information is included, the process proceeds to step S107, and one frame time of complement data is generated. Proceed to S108 and Step S109, set the number of frames to 4, and return to Step S102. In step S102, frame 6 is read, and the process proceeds to step S103, step S104, step S105, step S106, step S108, and step S109. The number of frames is set to 5, and the process returns to step S102.

[0053] Then, in step S102, frame 7, which is the head of the next PES packet, is read, and the process proceeds to steps S103 and S110. In step S110, the PTS included in frame 7 is changed to the PTS included in frame 2. Judges whether or not it is larger than the time obtained by multiplying the number of frames by one frame time. As described above, the time obtained by multiplying the PTS included in frame 2 by the number of frames multiplied by one frame time is PTS + 5 X 1 frame time of frame 2, and the PTS included in frame 7 is As shown in Fig. 5, when frame 2 to 5 Since the time has advanced for a while, step SI 10 becomes N, and the process proceeds to step S114. In other words, no frame interpolation is performed because no missing frame is detected.

Next, the case of FIG. 6 will be described. Fig. 6 is different from Fig. 5 in that an error occurs in frame 3 and the beginning of frame 4 cannot be recognized due to an error.

[0055] First, in the case of frame 2 which is the head of the PES packet, the process proceeds to steps S102 and S103. Since PTS is added, if there is no error in the previous PES packet, the process proceeds to steps S114, S104, The decoded audio data is output in steps S105, S106, and S108, and the process proceeds to step S109. The number of frames is set to 1, and the process returns to step S102. In step S102, frame 3 is read, and the process proceeds to step S103, step S104, step S105, and step S106.An error is detected and the process proceeds to step S107.Interpolation data is generated for one frame time, and step S108. The process proceeds to step S109, the number of frames is set to 2, and the process returns to step S102. Since frame 4 cannot be detected in step S102, frame 5 that can be detected at the beginning is read, and the process proceeds to step S103, step S104, step S105, step S106, step S108, and step S109. Return to step S10-2. That is, after interpolating for one frame time, the decoded frame data of a strong frame in which no error is detected is output continuously.

[0056] Subsequently, in step S102, frame 6 is read, and the process proceeds to step S103, step S104, step S105, step S106, step S108, and step S109. The number of frames is set to 4, and the process returns to step S102. .

[0057] Then, in step S102, frame 7, which is the head of the next PES packet, is read, and the process proceeds to step S103 and step S110. In step S110, the PTS included in frame 7 is changed to the PTS included in frame 2. Detects whether or not it is larger than the time obtained by multiplying the number of frames times one frame time. As described above, the time obtained by multiplying the PTS included in frame 2 by the number of frames multiplied by one frame time is the PTS +4 X 1 frame time of frame 2, and the PTS included in frame 7 is As shown in Fig. 6, since it is a time advanced by 5 frame hours from frame 2, step S110 becomes Y, and the step S111, S112 and advance interpolation data and PTS are output, and the frame is changed in step S113. Return to step S110 as 5. In step S110, PTS force included in frame 7 again PT included in frame 2 It is detected whether or not the time obtained by multiplying the value of S multiplied by the number of frames and 1 frame time is larger than the time obtained by multiplying the PTS included in frame 2 by the number of frames multiplied by 1 frame time. Frame 2 PTS + 5 X 1 frame time, which coincides with the frame 7 PTS, so proceed to step S114. In other words, frame missing is detected from PTS and frame interpolation is performed.

In the case of FIG. 6, the same operation is performed when error detection information is added to frame 3 instead of error detection during decoding and the head of frame 4 cannot be recognized.

[0059] The audio output buffer 104 accumulates decoded or interpolated audio data and PTS input from the audio decoder 103, and outputs them to the D / A converter 105 in accordance with the PTS.

[0060] The DZA converter 105 as reproduction means converts the audio data of the digital value to which the audio output buffer 104 is also input into an analog signal and outputs it to the speaker 106.

[0061] The speaker 106 amplifies the analog signal output from the DZA converter 105 to a predetermined level with an amplifier (not shown), and then emits it as a sound.

[0062] According to the present embodiment, in the information data receiving apparatus 100, the PES packet is also restored by the TS demultiplexer 101 for the input bit stream power, and decoded by the audio decoder 103 for each frame. If an error is detected during PES packet restoration, or if an error is detected during decoding by the audio decoding unit 203 in the audio decoder 103, the interpolation data generation unit 202 in the audio decoder 103 generates interpolation data for one frame time. Then, the audio decoding control unit 201 switches the selector 204 so that the interpolation data is output to the audio output buffer 104 instead of the error frame, and performs decoding of the next frame. If no error is detected, the audio decoding control unit 201 outputs it as it is. Therefore, when an error is detected, audio data for one frame time can be interpolated immediately. Then, the decoding of the next frame is performed, and if it is normal, it is output as it is, so that interpolation can be performed in units of one frame, so that it is possible to output the audio information of the subsequent frames while minimizing the influence of the error. it can.

[0063] Further, when the PTS is detected, the PTS is compared with the time when the previous PTS and the number of frames that have been interpolated or decoded are calculated. As a result, if the current PTS is large, the frame Since it is determined that there is a missing frame and the frame is interpolated for the missing time, PTS is detected. It is possible to easily determine the presence or absence of a missing frame at the time of extraction and perform interpolation. Therefore, it is possible to reduce the time axis shift of the decoded data.

[0064] It should be noted that in the above-described embodiment, the frame loss is determined by comparing the PTS with the number of interpolations and the number of frames calculated from the previous PTS. For example, a clock function may be provided inside the information data receiving device, and a missing frame may be detected from the clock and the PTS. In other words, it may be determined that the frame arrives at the time when the frame should have arrived, and in this case, it is determined that the frame is missing.

[0065] In the above-described embodiment, the fluctuation of the force PTS determined by comparing the PTS, the number of interpolations from the previous PTS, and the time for which the number of frames was calculated is determined. The determination may be made in consideration. For example, in Fig. 5, the time between two PTSs is 5 frame times, but in actual MPEG system transmission, the PTS added to frame 7 may not necessarily be the time after 5 frames from frame 2 ( Judgment may be made in consideration of that amount, which may fluctuate within a range of less than about 1Z2 frame time).

[0066] In the above-described embodiment, the audio has been described. However, not only the audio but also the video, for example, when the picture is the minimum code unit, the time information is added to the picture. The present invention can be applied when there is something that is not added.

[0067] The information data receiving apparatus described above may be a program that operates on a computer. In this case, the function of each block shown in the block diagram of FIG. 2 is functioned by a CPU and a memory, so that a computer-readable information data receiving program can be obtained.

[0068] Further, if the present invention is applied to a receiver that receives terrestrial digital broadcasting, CATV, broadcasting via the Internet, and the like, the influence of errors during transmission can be minimized. In particular, it is very effective when applied to mopile equipment and in-vehicle equipment that are mobile receivers that transmit information by radio waves.

[0069] According to the embodiment described above, the following information data receiving device, information data receiving method, and information data receiving program can be obtained.

[0070] (Supplementary Note 1) TS demultiplexer 101 that receives a bitstream in which a frame to which PTS is added and a frame to which PTS is not added is mixed, and TS demultiplexer 1 In an information data receiving apparatus 100 having an audio decoding unit 203 that decodes a bit stream received by 01 for each frame and a DZA converter 105 that reproduces audio data decoded by the audio decoding unit 203,

When the audio decoding unit 203 detects an error when decoding a frame, an interpolation data generation unit 202 that generates interpolation data for one frame time;

The interpolation data generated by the interpolation data generation unit 202 is output to the DZA converter 105 instead of the audio data of the frame in which the error is detected, and after the interpolation data is output, the powerful frame in which no error is detected is continued. An audio decoding control unit 201 that causes the audio decoding unit 203 to decode and output to the DZ A converter 105;

An information data receiving apparatus characterized by comprising:

[0071] According to this information data receiving apparatus 100, it is possible to interpolate audio data for one frame when an error occurs regardless of the presence or absence of PTS, and then continue decoding in units of frames immediately thereafter. Can do. Therefore, since the interpolation is performed immediately when an error occurs in the frame, the influence of the error can be minimized.

[0072] (Appendix 2) A bitstream in which a frame to which a PTS is added and a frame to which a PTS is not added is mixed is received, and the received bitstream is decoded for each frame and decoded. In an information data receiving method for playing back audio data,

If an error is detected when decoding a frame, interpolated data for one frame time is generated, the interpolated data is reproduced instead of the audio data of the frame in which the error is detected, and the interpolated data is A method of receiving information data, comprising: controlling to decode and reproduce a frame for which no error has been detected after output.

[0073] According to this information data reception method, audio data can be interpolated for one frame when an error occurs regardless of the presence or absence of PTS, and then decoding can be continued in units of frames immediately thereafter. . Therefore, since the interpolation is performed immediately when an error occurs in the frame, the influence of the error can be minimized.

(Supplementary Note 3) The TS demultiplexer 101 that receives a bitstream in which a frame to which a PTS is added and a frame to which a PTS is not added is mixed, and the bitstream that is received by the TS demultiplexer 101 Audio decoding unit 203 that decodes every frame, and audio In the information data receiving program that causes the computer to function as the DZA converter 105 that reproduces the audio data decoded by the decoding unit 203,

A computer-readable information data receiving program characterized by causing a computer to function.

[0075] According to this information data receiving program, it is possible to interpolate audio data for one frame when an error occurs regardless of the presence or absence of PTS, and then continue decoding in units of frames immediately thereafter. it can. Therefore, since the interpolation is performed immediately when an error occurs in the frame, the influence of the error can be minimized.

It should be noted that the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

Claims

The scope of the claims

[1] Receiving means for receiving information data in which the minimum coding unit to which time information for decoding and reproduction is added and the time information is added and the minimum code unit is mixed And a decoding means for decoding the information data received by the receiving means for each minimum coding unit, and a reproducing means for reproducing the decoded data decoded by the decoding means. In

When the decoding means detects an error when decoding the minimum coding unit, an interpolation means for generating interpolation data for the time of the minimum coding unit;

The interpolating data generated by the interpolating means is output to the reproducing means in place of the information data of the minimum coding unit in which an error is detected, and after the interpolated data is output, the error is detected. Control means for successively decoding the minimum code key unit by the decoding key means and causing the reproduction means to output the unit;

An information data receiving apparatus characterized by comprising:

[2] The control means detects missing of the minimum coding unit from the time information, causes the interpolation means to generate information data for a missing time, and outputs the information data to the reproducing means. Item 4. The information data receiving device according to Item 1.

[3] The control means compares the time calculated from the number of interpolations and the number of decodings of the minimum coding unit from the previous time information with the time information detected at present, and compares the time code with the minimum code i. 3. The information data receiving apparatus according to claim 2, wherein a missing unit of a heel is detected.

[4] Receive information data in which the minimum coding unit to which time information for decoding and reproduction is added and the time information is added and the minimum code unit to be mixed are received. The received information data is decoded for each of the minimum encoding units, and the information data receiving method for reproducing the decoded data is used.

When an error is detected when decoding the minimum coding unit, interpolation data for the time of the minimum coding unit is generated, and the information is replaced with the information data of the minimum coding unit in which the error is detected. After interpolated data is reproduced and the interpolated data is output, the minimum code key unit without error is continuously decoded and reproduced. An information data receiving method characterized in that control is performed.

5. The information data receiving method according to claim 4, wherein missing of the minimum coding unit is detected from the time information, and interpolated data corresponding to the missing time is generated and reproduced.

[6] The time calculated from the number of interpolations and the number of decoding keys in the minimum code unit of the previous time information power is compared with the currently detected time information, and the minimum encoding unit is missing. 6. The information data receiving method according to claim 5, wherein a drop is detected.

[7] Receiving means for receiving information data in which the minimum coding unit to which time information for decoding and reproduction is added and the time information is added and the minimum code unit is mixed And a decoding means for decoding the information data received by the receiving means for each minimum coding unit, and a reproducing means for reproducing the decoded data decoded by the decoding means. In the information data receiving program, when the decoding unit detects an error when decoding the minimum coding unit, an interpolation unit that generates interpolation data for a time of the minimum coding unit;

[8] The control means detects missing of the minimum coding unit from the time information, causes the interpolation means to generate information data for the missing time, and outputs the information data to the reproducing means. The information data receiving program according to Item 7.

[9] The control means compares the time calculated from the number of interpolations and the number of decoding of the minimum coding unit from the previous time information with the currently detected time information and compares the minimum time 9. The information data receiving program according to claim 8, wherein a loss of a sign unit is detected.

[10] A computer-readable recording medium, wherein the information data receiving program according to any one of claims 7 to 9 is stored.