WO1994021082A1 - Reproduction apparatus of voice signals - Google Patents
Reproduction apparatus of voice signals Download PDFInfo
- Publication number
- WO1994021082A1 WO1994021082A1 PCT/JP1994/000361 JP9400361W WO9421082A1 WO 1994021082 A1 WO1994021082 A1 WO 1994021082A1 JP 9400361 W JP9400361 W JP 9400361W WO 9421082 A1 WO9421082 A1 WO 9421082A1
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- WIPO (PCT)
- Prior art keywords
- samples
- audio signal
- signal
- audio
- data
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/802—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/93—Regeneration of the television signal or of selected parts thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/926—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation
- H04N5/9265—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal
- H04N5/9267—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
- H04N5/9268—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals with insertion of the PCM audio signals in the vertical blanking interval of the PCM video signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
Definitions
- the present invention provides M (M is a natural number) sample numbers that are not divisible by N for a video signal of N consecutive (N is a natural number) fields.
- the present invention relates to a playback apparatus that reproduces the above audio signal from a recording medium on which an audio signal having an audio signal is recorded, and is applied to, for example, a composite digital (D-2 standard) video tape recorder (VTR).
- VTR composite digital
- Background technology Conventionally, in a digital VTR, a video signal and an audio signal are converted into digital data, respectively, and the obtained digital video data and digital audio data are rotated by a rotating head. Recording is performed on a magnetic tape on an inclined track.
- Di digital VTR for example, D-2 standard, as shown in Figure 1.
- Taimuko one Taimuko one de is recorded
- Dotora click TR TC Con Control signal to provide a servo's Reference is recorded
- trawl Tracks TR CTL and cues for editing cues and audio signals are recorded.
- 'Audio tracks TR CUA 's three longitudinal tracks, as well as digital video signals and digital audio signals.
- Professional An inclined track called TRPRC called a gram track is specified.
- One tilt track TR PRC includes a central video sector VS and audio signal sectors AS 1, AS 2 at the front and rear thereof.
- a rotating magnetic head for reproduction In general, in a so-called helical scan type video tape recorder that records and reproduces a video signal via an inclined track on a magnetic tape, a rotating magnetic head for reproduction accurately scans the inclined track.
- the rotating magnetic head for playback is moved in the direction across the inclined track on the magnetic tape by a head shifting device that uses an electro-mechanical transducer such as a bimorph. Dynamic tracking control is performed.
- the rotating magnetic head for reproduction transferred by the head transfer device in this way is called a dynamic tracking head (DT head).
- the digital VTR of the above D-2 standard 400 fields are obtained in 5 fields according to the number of helical tracks, the number of audio channels and the number of sectors in 1 field.
- the number of samples is assigned to the audio sector of each gradient track. That is, in the above digital VTR, the sampling frequency of the audio signal is set to 48 kHz, and therefore, for example, in the case of the NTSC system (525/60 system), one of the video signals is used.
- the number of samples that can be recorded corresponding to the field is 800.08 samples, and the number of audio data samples in one field does not become an integer, but an integer ( 4 fields for 4 fields).
- the number of samples assigned to the audio sector in one field is set to 800, 800, 800, 800, 800, 800, 800,. , So that 4004 samples in 5 fields of the video signal are used as the recording unit of audio data.
- one field worth of data is 810 samples.
- the recording sequence information of the above information is recorded in the data of the helical track in one of the five fields, and this recording sequence is used during reproduction.
- Each can information can be detected as a single pulse in five fields.
- the digital VTR In the case of the digital VTR to which the NTSC method is applied, as described above, in order to maintain the 5-field sequence, the digital VTR has a counter that runs by 404 samples by itself.
- variable-speed playback at the time of variable-speed playback in which an arbitrary field is played back two or more times, for example, variable-speed playback at a speed less than X1x
- the total number of samples for the five fields becomes 4005 samples, and therefore the above five fields are sampled.
- the last one sample will be deleted from the 5-field sequence.
- this last sample is important information necessary for variable speed playback of the audio signal, it is necessary to reduce the influence of the variable speed playback at less than the X1 speed. Become.
- the above-mentioned drawback is in the case of the NTSC system.
- the number of samples per field is 972 samples (word) including AUX data, and the number of effective samples is It is a kind of 960 samples, and there is no problem because the number of samples is constant even in the above five-field sequence during variable speed playback.
- an object of the present invention is to provide a digital VTR having a variable speed playback function, which can provide a reproduced sound without a defect at the time of variable speed playback at less than XI speed, in view of the above-described conventional situation. It is assumed that.
- DISCLOSURE OF THE INVENTION an audio signal having M (M is a natural number) sample numbers that are not divisible by N is recorded for a continuous N (N is a natural number) field video signal.
- N is a natural number
- all of the samples from at least one playback are output, and the samples from the other playbacks are adaptively controlled, so that the above-mentioned N fields are sampled.
- the signal processing is performed by the signal processing means so that the total number of files is not more than the above M
- this arbitrary field is provided at the time of variable-speed playback in which an arbitrary field is played twice or more, that is, at the time of variable-speed playback of less than X1 speed.
- this arbitrary field is provided at the time of variable-speed playback in which an arbitrary field is played twice or more, that is, at the time of variable-speed playback of less than X1 speed.
- the signal processing means in the variable speed reproduction mode, is configured such that, among the audio signals obtained by performing the reproduction twice or more on the same field, all the samples obtained by the first reproduction are used. By outputting the samples and outputting the samples from the second and subsequent reproductions adaptively, the total number of samples in the N field can be reduced to M or less.
- the signal processing means outputs all the samples of the first playback of the audio signals obtained by performing the playback more than once for the same field, and outputs the samples by the playback of the second and subsequent times. For N, by not outputting at least one sample but outputting only the remaining samples, The total number of samples in the field can be M or less.
- the signal processing means has a storage means for temporarily storing the audio signal, and controls the number of samples to be output by controlling the reading of the audio signal from the storage means. Thus, the total number of samples in the N fields can be M or less.
- the signal processing means deshuffles the audio signal.
- the flag output means detects the total number of samples of the audio signal read from the storage means for each of the N fields, and the number of samples is less than M. Sometimes an error flag is output. Then, the signal processing means obtains less than the M samples by interpolation of the audio signal read from the storage means by the concealing means in accordance with the error flag.
- the reproducing means controls a movement of a dynamic tracking head for reproducing the tape-shaped recording medium in a direction perpendicular to a track of the tape-shaped recording medium.
- a servo means for outputting a jump signal indicating a control state, wherein the control means controls the number of audio signal samples read from the storage means in accordance with the jump signal.
- X Playback sound can be obtained without any defects during variable speed playback at less than 1x speed.
- the so-called dynamic tracking head arranged on the rotating head drum of the VTR can follow the inclined track on the tape, and the reproduced image is disturbed.
- the signal recorded on that track is 80 fields per field. Even if it is one sample, this is set to 800 samples, so that it does not exceed 400 samples for 5 field sequences, and 5 fields If the number of samples is less than 4004, the error flag can be generated as a predetermined flag for the missing sample, and concealment based on the error flag can be performed in the subsequent stage.
- Fig. 1 is a diagram showing the track format of the digital VTR of the D2-standard.
- FIG. 2 is a block circuit diagram showing a configuration of a digital VTR reproducing system to which the present invention is applied.
- FIG. 3 is a block circuit diagram showing a specific configuration example of a first audio processing unit in the reproduction system.
- FIG. 4 is a timing chart showing the timing of storing audio data in the memory in the first audio processing section.
- FIG. 5 is a diagram showing an arrangement state of audio data in the ECC block.
- FIG. 6 is a block circuit diagram showing a specific configuration of a shuffling block in the first audio processing unit.
- FIG. 7 is a timing chart showing the operation of the playback system of the digitizer VTR to which the present invention is applied.
- FIG. 8 is an evening timing chart for explaining a state of occurrence of an error flag in a shift playback mode of a digital VTR playback system to which the present invention is applied.
- the audio signal reproducing apparatus is configured, for example, as shown in FIG.
- the reproducing apparatus of this embodiment has two kinds of effective samples in one field, 800 and 801 samples (words), and has 4004 samples in five consecutive fields. Since the present invention is applied to a digital VTR playback system compatible with the NTSC system, which reproduces an audio signal from a video tape 1 on which an audio signal is recorded on a tilt track, the tilt track of the video tape 1 is used. Playback unit 2 that generates a playback RF signal from the playback unit.
- the F signal processing unit 3 includes a video data processing system 10 and an audio processing system 20 to which RF data is supplied from the reproduced RF signal processing unit 3.
- the playback unit 2 includes a dynamic tracking head 2A that scans the inclined track of the video tape 1, and has a variable-speed playback mode that performs variable-speed playback in which an arbitrary field is played twice or more. .
- the dynamic tracking head 2 A-tape driving system such as a capstan is controlled by a servo unit 4. Then, the reproducing unit 2 supplies the reproduced RF signal processing unit 3 with a reproduced RF signal obtained by scanning the inclined track of the video tape 1 with the dynamic tracking head 2A.
- the reproduced RF signal processing unit 3 binarizes the reproduced RF signal obtained by the reproducing unit 2 and converts the RF data subjected to the error correction processing using the inner code into the video data processing system 10 and the audio processing.
- the track identification (ID) data is separated from the RF data and supplied to the servo unit 4
- the servo unit 4 controls the tracking by moving the dynamic tracking head 2A of the reproducing unit 2 in a direction perpendicular to the inclined track of the video tape 1, that is, in the track width direction. Do. In the variable-speed playback mode, the track jump control of the dynamic tracking head 2A is performed based on the track identification (ID) data, and the same field is repeatedly played two or more times. Jump signal DTJP indicating the second and subsequent fields Is supplied to the first audio processing section 21 of the audio processing system 20.
- the operation modes of the servo unit 4 and the like are automatically switched by speed data provided by a system controller (not shown).
- the first video processing unit 11 collects video data from the RF data from the RF data supplied from the reproduced RF signal processing unit 3 and collects the video data from the RF data.
- the video data is subjected to error correction processing, deshuffling processing, error correction processing, etc.
- the second video processing unit 12 supports compression processing in the recording system, such as discrete cosine conversion. Decompression processing such as discrete cosine inverse transformation is performed.
- the audio processing system 20 collects and organizes audio data from the RF data supplied from the reproduced RF signal processing unit 3 in the first audio processing unit 21 with respect to the RF data supplied from the reproduced RF signal processing unit 3. Then, the audio data is subjected to error correction processing, deshuffling processing, error correction processing, etc., and the second audio processing unit 22 performs interpolation processing according to the playback speed by Lagrangian X interpolation processing. After that, the third audio processing unit 23 performs audio gain control.
- the first audio processing section 21 includes a data collection circuit 31, an outer code error correction circuit 32, a clock rate conversion circuit 33, a deshuffling circuit 34, and a data correction circuit 3.
- the data collection circuit block 31 converts the RF data supplied from the reproduction RF signal processing unit 3 into the RF data obtained by multiplexing video data and audio data. Collect and organize audio data from the data.
- the above-mentioned outer code error correction circuit 32 performs an error correction process using an outer code on the audio data supplied from the data collection circuit 31.
- the clock rate conversion circuit 33 converts the clock rate of the audio data subjected to the error correction processing from the video clock rate to the audio clock rate. Convert to a rate.
- the data generated from the first AS SYNC signal from the ECC data sequence shown in Fig. 5 is AUX 0, 0, AUX 4, 4, AUX 8, PV 0, PV 1, PV2, PV3, and PV4.
- the data when the next AS YNC signal is generated advances by 162 bytes in the ECC data order, and AUX3, 3, AUX7, AUX2, 2, PVO, PV1, PV2, PV3 in order.
- PV0 to PV4 are outer codes for error correction, and are no longer necessary for the upper data.
- One box of data consists of 24 bits.
- the data correction circuit 35 performs an error correction process on the data with the error flag set for the audio data deshuffled by the deshuffling circuit 34.
- the same field is reproduced twice or more in order to prevent overflow of deshuffling when the speed is lower than X1x speed.
- all valid samples from at least one of the above two or more playbacks are taken out, and the remaining samples from the same field are played back.
- the number of pulls is adaptively deleted, so that signal processing is performed so that the total number of samples in five fields by the variable speed reproduction is equal to or less than 400 samples.
- the shuffling circuit 34 has at least a memory 60 capable of storing valid samples of the above-mentioned field, and a lead address generation circuit 63 for controlling reading of the memory 60.
- the read address generation circuit 63 reads out from the memory 60 all the valid samples by at least one of the two or more reproductions. Control is performed so that the reading from the memory 60 is adaptively deleted for the number of samples corresponding to the remaining times of reproduction.
- the total number of samples corresponding to N (five) fields by the variable speed reproduction is less than the above M (less than 4004 samples). ), That is, if, for example, the five-field sequence cannot be satisfied, a predetermined flag corresponding to the shortage is output for the above-mentioned M (404 samples). ing.
- the shuffling circuit 3 by controlling the write address or the read address of the memory 60, the above-described ECC blocks are re-arranged and de-shuffled. I have. That is, data is written to the memory 60. When writing, by controlling the write address and de-shuffling the data and reading it out sequentially, or when writing and reading out the data sequentially, you can control the read address and sort the data.
- the above deshuffling is realized. In this embodiment, the latter method is used to perform the deshuffling. Therefore, the write address generation circuit 62 is used for the top of the field supplied via the terminal 42. Represents AV—the STI signal, and the AS YNC signal that is supplied via the terminal 43 and represents the beginning of the 1 ECC block.
- the terminal 4 4 represents the AS YN C signal as one block for four channels.
- a write address for storing data is sequentially generated in the memory 60 in synchronization with the data (ECC OUT) supplied to the terminal 41. Since the ACH signal has four channels of audio signals, the four channels of the ASYNC signal are represented as one lump.
- the lead address generation circuit 63 generates a read address for the memory 60 to perform deshuffling of the data of the ECC block.
- one field of data is 810 words including AUX data, etc., so the data in the 810 words stored in the memory 60
- the read address generation circuit 63 generates the 800-sample read address or the 800-sample read address is determined via the terminal 54. The switching is performed based on the FS5F signal indicating that the field of the supplied audio signal is 800 samples. In the case of the PAL system, the data for one field is 9772 words (1 word is 24 bits) including the above AUX data, etc., and the sampling frequency at the time of reading is selected from these. The data of 960 samples will be sorted in synchronization with.
- the terminal 53 is supplied with rotation direction information indicating whether the variable speed reproduction is in the forward direction or in the reverse direction.
- the lead address generation circuit 63 also determines the readout address based on the rotation direction information. Is occurring.
- the write address from the write address generation circuit 62 and the read address from the read address generation circuit 63 as described above are sent to the memory 60 via the multiplexer 61. ing.
- Data deshuffled and read from the memory 60 is output via the terminal 8. This deshuffling output is sent to the error correction circuit 35 described above.
- the AV-ST0 signal indicating the start of deshuffling in the above-described door address generation circuit 63 is formed by the following configuration.
- the process circuit 64 receives the input data via the terminal 45.
- FS 5 F signal indicating that the number of valid samples of the sample is 800 samples
- the dynamic tracking head 2 A traces the same track in the playback unit 2 via the terminal 46.
- a jump signal DTJ MP indicating whether the operation has been performed.
- the input from the terminal 47 is not a signal indicating that the signal is a PAL signal
- the input from the terminal 41 is an NTSC signal.
- Judge. In this process circuit 64, if it is determined that the input is in the NTSC format and that the number of valid samples is 800 samples by the FS5F signal, the sample counter of the next stage is used.
- a flag indicating that the field has a valid audio signal of 81 1 samples is output at all other times. The flag indicating that the sample is 800 or 800 samples from the process circuit 64 is sent to the sample counter 66.
- the sample count 66 is included in the next field based on the flag indicating whether the number of valid samples in the field is 800 or 8001, as determined by the process circuit 64. Set the number of data in advance and operate the free-running counter. For example, when the above flag is "H”, 800 sampling clocks FS (48 kHz) are counted, When it is "L”, it counts 8001 sampling clocks FS.
- the pulse generated by the sample counter 66 and indicating the 800 or 800 sample that is, the pulse at the end of the sound, is used as a sound field pulse as one input terminal of the AND gate 67 at the next stage. Sent to
- the 5-field counter 68 always counts 4004 samples based on the signal AV-STI in order to maintain a 5-field audio sequence.
- the FS5P signal output from the 5-field counter 68 and indicating the delimitation of each of the 400 samples is connected to the other input terminal of the AND gate 67 and the other input terminal of the AND gate 65. It is sent to the input terminal.
- the FS5P signal is also output to an external configuration via the terminal 50.
- the other input terminal of the above-described AND gate 65 is supplied with a pulse indicating a field break of the sample counter 66.
- One pulse per 5 fields from the 5 field counter 68 output from the output terminal of the AND gate 65 and the pulse for each field from the sample counter 66 The logical product output with the pulse is sent to the sample counter 66 as a reset signal for the sample counter 66 described above.
- a pulse indicating the break of the audio field generated in the sample counter 66 above and the five fields from the above five field counter 68 1 The logical product output of the pulse and instructs the read address generation circuit 63 to start the deshuffling of the 800-sample or 800-sample field. Sent as a signal. It should be noted that this AV-STO signal is also sent to an external configuration via terminal 49. It has become.
- the shuffling circuit 34 in this embodiment outputs the FS5P signal indicating the delimiter of each of the above-mentioned 4004 samples, and is also synchronized by the AV-STI signal, —
- the ST0 signal controls the lead address generation circuit 63 as the deshuffling start pulse, and the audio signal is deshuffled based on this AV-STO signal. That is, when the above FS5P signal becomes "H” while the above signal AV-STI signal is "L".
- the effective audio signal whose field, that is, the interval between AV-STI signals is 800 samples.
- the shuffling circuit 34 executes the deshuffling corresponding to this, and performs the deshuffling corresponding to 800 samples at other times.
- the above operation does not cause a failure in the five-field sequence.
- the track is traced twice or more, for example, if the track of the above-mentioned 81 1 sample is traced 5 times, the sample of 5 fields is sampled. The sum of the numbers becomes 4 0 5 samples, and if we try to keep the 5 field sequence by deleting the last sample, the problem described above will occur.
- the shuffling circuit 34 of this embodiment if the same track is traced twice or more in the variable speed playback mode of less than XI double speed, the shuffling circuit 34 shown in FIGS. As shown in the figure, by setting the jump signal DT JMP to “H”, data loss when handling new field data in the FS5P signal is prevented. It does not happen.
- the valid sample data required for the deshuffled data is always only the data of the new field, so if the same track is traced twice or more, it becomes unnecessary. For sample data from the second and subsequent traces, samples are adaptively deleted to maintain a 5-field sequence.
- the conceal flag generation circuit 69 sets the error flag. Encountered this error
- the error correction circuit 35 at the next stage replenishes data based on the flag.
- the concealed flag generation circuit 69 is based on a pulse indicating a field break from the sample counter 66 and a pulse once every five fields from the five field counter 68. Then, the above error flag is generated. For example, a sample field for five fields corresponding to the pulse indicating the field break from the sample counter 66 is converted to the five fields from the five field counter 68 above. If it occurs before one pulse, it is determined that the number of samples in the above five-field sequence is less than 4004 samples, and one is added to the relevant sample number and five fields. An error flag corresponding to the difference from the first pulse is generated, that is, an error flag corresponding to the shortage of the 404 samples. This error flag is sent to the error correction circuit 35 via the terminal 51. Note that this error flag is normally "L", and is determined to be a signal which becomes "H” in response to the number of missing samples when the above-mentioned shortage of 404 samples occurs.
- the error correction circuit 35 when the above-mentioned error flag is supplied through the terminal 51, for example, the sample of the four fields of the five field sequence is generated by a pre-hold or the like. Interpolate the missing data.
- the jump signal DTJMP from the terminal 46 is supplied to one input terminal from the output of the concealed flag generation circuit 69.
- the jump signal DTJMP is supplied to the other input terminal of the R gate 70.
- the output from c the ⁇ R gate 7 0 also summer, Lai for the memory 6 0 Toine
- This signal is output as a single-field signal WE, which allows the new field data to be included in the FS5P signal even if the same track is traced two or more times in the variable speed playback mode below X 1x speed. The data is taken into the memory 60 when it is being handled, so that no data is lost.
- the output from the error correction circuit 35 maintains a 5-field sequence as shown in FIG. 7 even at the variable speed reproduction of X 1 ⁇ speed or less. Becomes possible.
- FIG. 7 also shows, for comparison, a sample of each field in the case of deleting data simply exceeding 404 samples described in the conventional example.
- the output from the above AV-TI signal to the AV-T ⁇ signal requires 32 delays by the sampling clock FS. This is the time required to accumulate data in the memory 60 before performing ringing. That is, considering the margin of writing / reading of the memory 60, the delay amount is set to 32 ⁇ FS from the capacity of the memory 60 and the safety of the system.
- this embodiment is effective in NTSC signal processing, especially when it is not possible to output all the sounds recorded on the tape to AESZEBU in their original form during variable speed playback at less than X1 speed.
- a variable speed playback process of audio is added after these processes, and even if the process is not added, AES / EBU output is performed. Error flag processing is performed so that the signal is sequential.
- the track examines the relationship with the previous field and processes it, so Good reproduction sound can be obtained without significant influence.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51982194A JP3603307B2 (ja) | 1993-03-10 | 1994-03-07 | 音声信号の再生装置 |
KR1019940704002A KR100296210B1 (ko) | 1993-03-10 | 1994-03-07 | 음성신호재생장치 |
DE69414664T DE69414664T2 (de) | 1993-03-10 | 1994-03-07 | Vorrichtung zur wiedergabe von sprachsignalen |
EP94908505A EP0641125B1 (en) | 1993-03-10 | 1994-03-07 | Reproduction apparatus of voice signals |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5/49267 | 1993-03-10 | ||
JP4926793 | 1993-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994021082A1 true WO1994021082A1 (en) | 1994-09-15 |
Family
ID=12826064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000361 WO1994021082A1 (en) | 1993-03-10 | 1994-03-07 | Reproduction apparatus of voice signals |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0641125B1 (ja) |
JP (1) | JP3603307B2 (ja) |
KR (1) | KR100296210B1 (ja) |
DE (1) | DE69414664T2 (ja) |
WO (1) | WO1994021082A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6266470A (ja) * | 1985-09-19 | 1987-03-25 | Matsushita Electric Ind Co Ltd | デイジタル信号記録再生装置 |
JPH03244288A (ja) * | 1990-02-22 | 1991-10-31 | Matsushita Electric Ind Co Ltd | ディジタル音声記録再生装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2164480B (en) * | 1984-09-18 | 1988-01-13 | Sony Corp | Reproducing digital audio signals |
US4772959A (en) * | 1986-04-02 | 1988-09-20 | Matsushita Electric Industrial Co., Ltd. | Digital signal recording and reproducing apparatus |
JPH01119127A (ja) * | 1987-10-31 | 1989-05-11 | Sony Corp | ディジタル信号伝送装置 |
-
1994
- 1994-03-07 JP JP51982194A patent/JP3603307B2/ja not_active Expired - Fee Related
- 1994-03-07 WO PCT/JP1994/000361 patent/WO1994021082A1/ja active IP Right Grant
- 1994-03-07 EP EP94908505A patent/EP0641125B1/en not_active Expired - Lifetime
- 1994-03-07 DE DE69414664T patent/DE69414664T2/de not_active Expired - Fee Related
- 1994-03-07 KR KR1019940704002A patent/KR100296210B1/ko not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6266470A (ja) * | 1985-09-19 | 1987-03-25 | Matsushita Electric Ind Co Ltd | デイジタル信号記録再生装置 |
JPH03244288A (ja) * | 1990-02-22 | 1991-10-31 | Matsushita Electric Ind Co Ltd | ディジタル音声記録再生装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0641125A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR950701792A (ko) | 1995-04-28 |
EP0641125A1 (en) | 1995-03-01 |
KR100296210B1 (ko) | 2001-10-24 |
DE69414664D1 (de) | 1998-12-24 |
EP0641125B1 (en) | 1998-11-18 |
EP0641125A4 (ja) | 1995-03-15 |
JP3603307B2 (ja) | 2004-12-22 |
DE69414664T2 (de) | 1999-05-06 |
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