CN1173712A - System for recording and/or reproducing pulse code modulation digital audio signal - Google Patents
System for recording and/or reproducing pulse code modulation digital audio signal Download PDFInfo
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- CN1173712A CN1173712A CN97114983A CN97114983A CN1173712A CN 1173712 A CN1173712 A CN 1173712A CN 97114983 A CN97114983 A CN 97114983A CN 97114983 A CN97114983 A CN 97114983A CN 1173712 A CN1173712 A CN 1173712A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00007—Time or data compression or expansion
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/10537—Audio or video recording
- G11B2020/10546—Audio or video recording specifically adapted for audio data
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Abstract
The invention provides a digital audio recording apparatus for formatting digital audio data and recording formatted data on a digital recording medium, so that digital audio data having a first sampling frequency and other digital audio data having a second sampling frequency being twice the first sampling frequency can be reproduced in both a reproduction apparatus having an operating frequency for digital-to-analog converting the first sampling frequency and that having an operating frequency for digital-to-analog converting the second sampling frequency. The digital audio recording apparatus transforms the digital audio data into transformation coefficients in a frequency domain, the transformation coefficients are formatted using one of predetermined recording formats. Corresponding digital audio reproduction apparatus reproduces an analog audio signal from the formatted data, based on an operating frequency for D/A conversion, a formatting method of the formatted data, and a sampling frequency of the audio signal contained in the formatted data.
Description
The present invention relates to a kind of system that is used for writing down and/or reproducing pulse code modulation digit (PCM) sound signal, have nothing in common with each other even particularly relate to a kind of sampling frequency of pcm digital audio signal therein, but this digital audio and video signals also can be recorded in the system that maybe can write down and/or reproduce pcm digital audio signal on the digital recording medium from reproduced being used on this digital recording medium.
All use the device of pcm digital audio signal all to use a reference unit, and this reference unit is a kind of data cell that can realize error correction.The size of this reference unit is according to the characteristic of a transmission medium and definite.According to predetermined sampling frequency and a sampled digital audio and video signals is recorded on the recording medium with the form of data block, this data block has by determined data size of data recording performance or data volume such as compact disk (CD), digital audiotape recording mediums such as (DAT).When carrying out at this recording medium when reproducing operation, digital-analog convertor is converted to simulated audio signal with the order from the data stream of this recording medium with a digital audio and video signals.
About pcm digital audio signal, in order to replace the prevailing system that uses 44.1KHz or 48KHz sampling frequency with the new audio recording system that uses 88.2KHz or 96KHz sampling frequency, a kind of advanced person's audio frequency (ADA) system for example, has been proposed in Japan.But, use sampling frequency to be the impossible sound signal that writes down with digital form according to the new system that proposes of reproducing of the existing playback system of 44.1KHz or 48KHz.Therefore, can reproduce according to the new digital audio and video signals that register system write down, need a kind of independent digital signal processing, not cause that like this noise just can handle the bit number of representing each sampling in order to make a kind of so existing playback system.Carry out in the example of digital signal processing at needs, one low-pass filtering is arranged to eliminate the frequency component that is higher than 44.1KHz or 48KHz from the signal that recording medium was read, also have one to select filtering (decimation filtering) so that the signal that is low pass filtering enters in the signal with 44.1KHz or 48KHz sampling frequency.
In view of the above, in order to reproduce a sound signal according to the new system that proposes, this existing playback system will be handled the voice data of all inputs.Therefore, need the digital processing unit of its operating frequency greater than the sampling frequency of input audio data.The digital audio and video signals of the signal recording system that therefore, proposes and to improve the expense of existing playback system too high in order to reproduce.In addition, also need increase the RAM capacity that is used for above-mentioned independent digital signal processing, thereby must increase expense for a kind of like this improvement.
Simultaneously, the playback system that includes the D-A converter with 88.2KHz or 96KHz sampling frequency directly transmits the data that received and does not handle this received data to an output terminal.Therefore, do not need to be used for the digital processing unit and the jumbo RAM of processing audio data.But, be higher than the 88.1KHz or (96KHz) the other audio recording system of frequency if propose to use, then also can produce the problem as prevailing system.
In order to address the above problem, purpose of the present invention provides a kind of system that is used for the conversion coefficient by will converting a frequency domain at the audio sample in the predetermined reference unit of digital audio and video signals to and according to the predetermined recording form this conversion coefficient is formatd the sound signal of being taken a sample according to current of record method and new record method at existing audio devices and the new audio devices record that uses new recording method.
Another object of the present invention provides and a kind ofly is used for the conversion coefficient by will converting a frequency domain at the audio sample in the reference unit of predetermined digital audio and video signals to and formats at existing audio devices to this conversion coefficient and use the new audio devices of new record method to reproduce system according to the sound signal of current of record method and the sampling of new record method according to the predetermined recording form.
In order to realize above-mentioned purpose of the present invention, a kind of digital audio frequency recording device that is used for a digital recording medium is provided, this digital audio frequency recording device comprises:
The reference unit formatting mechanism is used for receiving a pulse code modulation digital audio signal, and forms a reference unit sequence, and each reference unit wherein has the preliminary dimension from the reception digital audio and video signals;
Receive the converting means of this reference unit sequence, the audio sample that is used for belonging to an independent reference unit is transformed into the conversion coefficient in a frequency domain, and exports a reference unit sequence that includes conversion coefficient;
Formatting mechanism, be used for receiving the reference unit sequence from this converting means, and use a kind of record format in first record format and second record format to format and export the reference unit sequence that this receives, wherein first record format is used to form and comprises and belong to first record cell of the conversion coefficient of reference unit separately that second record format is used to form one second record cell that comprises the conversion coefficient that belongs to a low frequency region and comprises one the 3rd record cell of the conversion coefficient that belongs to a high-frequency region among the conversion coefficient in being included in reference unit separately; With
Pen recorder is used for writing down the record cell sequence of exporting from formatting mechanism on this digital recording medium.
In order to realize another object of the present invention, a DAB transcriber that is provided comprises:
One input end, be used for receiving the formative data of utilizing in first record format and second record format of a kind of record format, wherein among the conversion coefficient in being included in each reference unit, first record format is used to form the 3rd record cell that one first record cell that comprises the conversion coefficient that belongs to each reference unit and second record format are used to form second record cell of the conversion coefficient that is included in the low frequency region and are included in the conversion coefficient in the high-frequency region;
Number-Mo (D/A) converter is used for according to predetermined operating frequency one supplied with digital signal being carried out the digital-to-analog conversion;
With the device that this input end is connected, be used for being identified in the sampling frequency and a record format of the sound signal that is comprised in these input format data, and the data of this recognition result of output expression;
The inverse format makeup is put, be connected to input end and receive the data of exporting from the device that is used for discerning, inverse format makeup is put and is used for according to relatively coming between this sampling frequency discerned and the predetermined operating frequency carried out the inverse format processing to the formatted data that is received, and the record format of first and second record formats of the pre-storage that is identified is carried out the inverse format processing; With
Inverter has the optimized inverse transformation characteristic of D/A converter, is used for being transformed into from the conversion coefficient that output is put in the makeup of this inverse format the audio sample a time domain, and the audio sample of generation is provided to this D/A transducer.
Below with reference to the description of drawings most preferred embodiment.
Fig. 1 is the schematic block diagram according to a digital audio frequency recording device of a most preferred embodiment of the present invention;
Fig. 2 is the detailed diagram of the formatting unit shown in Fig. 1;
Fig. 3 A to 3D is used for explanation according to record format of the present invention;
Fig. 4 is a schematic block diagram according to a DAB transcriber of the present invention; With
Fig. 5 is a block diagram according to a DAB transcriber of the present invention.
Below with reference to accompanying drawings most preferred embodiment of the present invention is described in more detail.
Can on a recording medium, have the sound signal of 44.1KHz or 48KHz sampling frequency and write down sound signal according to the record format that is proposed in the present invention shown in Fig. 1 with 88.2KHz or 96KHz sampling frequency according to a new audio recording method according to existing audio recording method record according to digital audio and video signals pen recorder of the present invention.For clarity, higher relatively sampling frequency is referred to as first sampling frequency, and relatively low sampling frequency is referred to as second sampling frequency.
A sampled sound signal is imported in the reference unit formation device 10 of Fig. 1 in the time domain that is used the linear PCM quantification.This reference unit forms device 10 this input digital audio signal is divided into some reference units that each has a preliminary dimension.Described reference unit and record cell are determined by the characteristic of an audio quality and transmission medium.In other words, the size of reference unit is determined according to the data volume that can be repaired in the error that record and reproduction period applied of linear pulse code modulation digital audio signal.The size of this record cell is that signal record characteristic according to digital recording medium is based on being determined on a digital recording medium or from the data volume that this digital recording medium is read by continuous recording.Fig. 3 A shows an example of the reference unit that obtains by separation.This reference unit of Fig. 3 A is made up of the sequence of 2m audio sample.This reference unit formation device 10 provides by transducer 20 is sequentially separated and obtains reference unit.Transducer 20 is transformed to conversion coefficient in a frequency domain with audio sample.The performance of this transducer 20 is determined by the audio quality of a target audio signal.The resultant conversion coefficient of territory conversion by each reference unit is output to formatting unit 30 with the form that can discern each reference unit.This formatting unit 30 formats the conversion coefficient in each reference unit in first record format shown in Fig. 3 B and a kind of form in second record format shown in Fig. 3 C and the 3D by using.The detailed structure of this formatting unit 30 and operation describe in detail to 3D with reference to Fig. 2 and Fig. 3 B.Register 40 is recorded in formatted data in this formatting unit 30 at the digital recording medium such as CD and DAT (, not shown) with going up digitizing.
Referring to Fig. 2, Fig. 2 shows the detailed diagram of formatting unit 30.Record format indicator 32 in this formatting unit 30 is specified corresponding to a kind of form in first and second record formats that form resulting reference unit in the device 10 at reference unit.The record format indication of this record format indicator 32 can want the user of recorde audio signal to finish by one by design.
When having selected first record format, the conversion coefficient sequence that record format indicator 32 is received from transducer 20 to 34 outputs one of first data formatter.First data formatter 34 is formatted as the audio sample in the independent reference unit first record cell and exports the first record cell sequence to the first additional data inserter 35.This first record cell comprises from the resulting conversion coefficient of a reference unit.
Fig. 3 B shows the conversion coefficient F[0 that is comprised in first record cell], F[1], F[2] ..., and F[2m].In Fig. 3 B, F[0] conversion coefficient of expression lowest frequency, and F[2m] conversion coefficient of expression highest frequency.The first additional data inserter 35 will be illustrated in first additional data of a sampling frequency of the sound signal that is comprised in the record cell sequence that is received and the start-up portion that second additional data that is illustrated in the audio sample quantity in the independent record cell is inserted into this record cell sequence.Because the invention is not restricted to first and second additional datas are inserted the example of record cell sequence start-up portion, so those skilled in the art are clear that this first data formatter 34 and can revise by a kind of like this mode very much, promptly can suitably insert first and second additional datas according to a characteristic that transmits a passage or a recording medium in this record cell sequence.
When second record format was selected, then record format indicator 32 was exported the reference unit sequence that is received from transducer 20 to second data formatter 36.Second data formatter 36 will be formatted as two record cells at the conversion coefficient in the independent reference unit that is provided from record format indicator 32.In detail, the conversion coefficient of second data formatter, 36 five equilibriums in this reference unit, and form the 3rd record cell that one second record cell that is made of the conversion coefficient in relatively low frequency field and conversion coefficient in relative higher frequency regions constitute.Therefore, two record cells from a reference unit, have been obtained.Fig. 3 C shows the conversion coefficient F[0 that comprises in second record cell], F[1], F[2] ..., and F[m].Fig. 3 D shows the conversion coefficient F[m that comprises in the 3rd record cell], F[m+1], F[m+2] ... and F[2m].Second data formatter 36 is to the second additional data inserter, 37 outputs, one a record cell sequence that obtains from the sequence of reference unit.In this record cell sequence, corresponding to one relatively the second and the 3rd record cell time lead of the reference unit of time lead in corresponding to the second and the 3rd record cell of the reference unit of time lag relatively.In the situation corresponding to the record cell of same reference unit, the second record cell time lead is in the 3rd record cell.
The second additional data inserter 37 receives from a sequence of this record cell of second data formatter 36 and with above-mentioned first additional data and second additional data and is inserted into from the start-up portion of the record cell sequence of second data formatter, 36 outputs.In addition, the second additional data inserter 37 the 3rd additional data that will be used for discerning the resulting second and the 3rd record cell from the same reference unit is inserted into the start-up portion separately of the second and the 3rd record cell.
The said apparatus of Fig. 1 can use two kinds of record formats.But, in the embodiment of reality, preferably only use a kind of record format.If the device of Fig. 1 has used two kinds of record formats, then need to be used to discern the independent additional data of two kinds of record formats, i.e. the record format data.In this case, the register in Fig. 1 device 40 inserts this record format data at the start-up portion of these formatted data.
The transcriber of Fig. 4 reproduces the digital audio and video signals that records the recording medium (not shown) of digital audio and video signals thereon from, and this device includes a D/A converter 81 that has with the second sampling frequency identical operations frequency.Reader 50 reads formatted data from this recording medium (not shown) that records the digital audio and video signals that is transformed to a frequency field thereon.Be included in sound signal in the formatted data one as mentioned above first sampling frequency or second sampling frequency can be arranged.In this reader 50, first additional data that frequency identifier 51 bases are comprised in the formatted data that this reads is discerned the sampling frequency of a digital audio and video signals, and to record format recognizer 53 these recognition results of output.Record format recognizer 53 uses the additional data that is included in from the formatted data that this frequency identifier 51 is received to discern the record format of formatted data.If the signal that is write down in this recording medium is according to first record format and formatted data, then these data comprise first and second additional datas and record format data.As the signal that writes down on this recording medium is according to one second record format and formatted data, and then these data comprise first, second and the 3rd additional data and record format data.This reader 50 provides based on this frequency identification result's the second and the 3rd additional data and record cell sequence and the record format that is identified to inverse format unit 60 (1).For data are provided, can be designed to reader 50 and provide all data that read from this recording medium, and this inverse format unit 60 (1) is discerned sampling frequency and record format and provided voice data selectively to inverse converter 71 based on the data that received from reader 50 to inverse format unit 60 (1).
When recorded data on this recording medium had first sampling frequency and first record format, this inverse format unit 60 (1) provided the data that received from this reader 50 to first data extractor 61.For first record cell of each data that received from reader 50, this first data extractor 61 is extracted in the conversion coefficient in this low frequency region.In more detail, first data extractor 61 is extracted the conversion coefficient of low frequency region and deletion second additional data from receive data according to second additional data that is included in from the data that reader 50 is received from the conversion coefficient independent record cell.Here, this low frequency region mean from by the represented whole frequency field of all conversion coefficients an independent record cell by two frequency fields of five equilibrium one than low frequency region.Its result is selected by getting 1 (2: 1) two by means of first data extractor 61 from the first independent record cell data of reader 50 output.When recorded data on this recording medium had first sampling frequency and second record format, this inverse format unit 60 (1) provided the data that received from reader 50 to first data extractor 61.This first data extractor 61 is extracted second record cell based on the 3rd additional data that is included among the data that received from reader 50, and deletes the 3rd additional data.When the data that write down on this recording medium had second sampling frequency and first record format, 60 (1) deletions of inverse format unit were included in second additional data from the data that reader 50 is received.When the data that write down on this recording medium had one second sampling frequency and one second record format, this first inverse format unit 60 (1) provided the data that received from reader 50 to one first inverse format device 63.The first inverse format device 63 comes the second and the 3rd record cell corresponding to same reference unit is carried out reverse format based on second record format and the 3rd additional data of pre-storage.Then, the first inverse format device 63 is deleted the 3rd additional datas and is exported the final conversion of staying by above-mentioned signal Processing to inverse converter 71.
Because the invention is not restricted to the situation of first mentioned in this example data extractor 61 and the first inverse format device, 63 deletions the second and/or the 3rd additional data, can improve this inverse format unit 60 (1) to delete the second and the 3rd additional data so those skilled in the art should know.
In addition, those skilled in the art it should also be clear that this modification is that reader 50 is exported from all data that this recording medium read to inverse format unit 60 (1), and the record format data of inverse format unit 60 (1) deletions the data that received from reader 50.
The independent reference unit conversion coefficient that inverse converter 71 is designed to suitably that transformation by reciprocal direction obtains from audio sample with one second sampling frequency, and this inverse converter 71 will be from the inverse format unit 60 (1) the conversion coefficient inversions that receive change audio sample a time domain into.This D/A transducer 81, be carried out digital-analog conversion from the audio sample of these inverse converter 71 outputs.The device of Fig. 4 can reproduce one to have sound signal and corresponding to a sampling frequency of the twice of an operating frequency of D/A transducer 81 and has sound signal corresponding to a sampling frequency of an operating frequency of D/A transducer 81.Therefore, the sound signal on being recorded in this recording medium has first sampling frequency and this D/A transducer 81 when operating according to second sampling frequency, and Fig. 4 device can provide an auditory system with people can't debate the sound signal of other identical tonequality.
Different with Fig. 4 device, Fig. 5 shows a kind of device that has with the D/A transducer 83 of the first sampling frequency same operation frequency that includes.In Fig. 5, carry out and Fig. 4 square frame identical functions because have, so detailed explanation is omitted with the square frame of Fig. 4 same numeral.The data that inverse format unit 60 (2) uses from reader 50 are carried out an inverse format operation according to formatted data.When recorded data on this recording medium had first sampling frequency and first record format, inverse format unit 60 (2) provided the data that received from this reader 50 to second data extractor 65.Second data extractor 65 is extracted in first record cell that is comprised and deletes second additional data subsequently from the data that reader 50 is received.Thereafter, inverse format unit 60 (2) is to the inverse transformation block 73 output frequency recognition results and first record cell.Inverse converter 73 determines that according to this frequency identification result present first record cell that receives has and the identical sampling frequency of a sampling frequency in D/A transducer 83, and the conversion coefficient that will comprise in independent first record cell is transformed to the audio sample in a time domain.When recorded data on this recording medium has second sampling frequency and first record format, second data extractor 65 deletion in this inverse format unit 60 (2) be included in the data that from reader 50, received second additional data and to inverse converter 73 output first record cell and frequency identification results.In this case, if when belonging to the conversion coefficient of first record cell and being transformed into the audio sample of this time domain, then this audio sample number becomes less than the audio sample number of the reference unit of the signal Processing that belongs to relevant Fig. 5 device.Reason for this reason, the data filler cells 75 in this inverse converter 73 is carried out zero paddings to fill up this data in this frequency domain.This inverse converter 73 is transformed to audio sample in this time domain with first record cell by the conversion coefficient of zero padding.
When recorded data on a recording medium had one first sampling frequency and one second record format, the second inverse format device 67 in inverse format unit 60 (2) carry out inverse formatization according to second record format of a pre-storage to the data that received from reader 50.In more detail, the second inverse format device 67 will turn to a corresponding reference unit corresponding to the second and the 3rd record cell inverse format of same reference unit according to the 3rd additional data and second record format.Afterwards, these inverse format unit 60 (2) deletion the 3rd additional data and record format data, and to inverse converter 73 output reference unit sequence and frequency identification results.This inverse converter 73 is according to 60 (2) the frequency identification results that received are transformed to the conversion coefficient of each reference unit the audio sample of this time domain from the inverse format unit.
When recorded data on this recording medium had second sampling frequency and second record format, the second inverse format device 67 carry out inverse formatization according to second record format of the 3rd additional data and pre-storage to the second and the 3rd record cell that is received from reader 50.In this case, the audio sample number in this time domain becomes and carries out the audio sample number of the required usefulness of signal Processing less than Fig. 5 device.Data filler cells 135 is carried out above-mentioned zero padding, and its gained reference unit is transformed to the audio sample of this time domain in this inverse converter 133.These audio samples carry out the digital-to-analog conversion in this D/A transducer 143.Therefore, the device of Fig. 5 can provide a kind of and has for the audience and the digital audio and video signals with existing sampling frequency according to the audible signal of the identical tonequality of signal of the sampling frequency of this new recording method.
The inverse converter 73 of Fig. 5 can be designed to the conversion coefficient from the resulting reference unit separately of this audio sample with one second sampling frequency is carried out inverse transformation.In this case, the frequency identification result that this inverse converter 73 need not this inverse format unit 60 (2) just can judge whether to have carried out this data and fills.
Suppose that each reference unit comprises K conversion coefficient, first sampling frequency is L and second sampling frequency is M, then can (K * M)/L calculates the quantity of conversion coefficient required in the existing transcriber that has corresponding to an operating frequency of second sampling frequency according to formula Int.Here, " Int " is the operator that is used to abandon less than an integer-valued value.In this case, has the audio sample that is transformed to this time domain by the resulting transformation of variable coefficient of above-mentioned formula.Utilize this principle, the sampling frequency that system according to the present invention can be applicable to a sound signal is brought up on the audio devices of integral multiple of first sampling frequency.
In conjunction with first and second sampling frequencies the foregoing description is described.But the present invention also can be applicable to a sound signal that has greater than the sampling frequency of first sampling frequency.
As mentioned above, audio signal recording according to the present invention and playback system can reproduce the sound signal with doubled frequency difference in than the audio devices of high sampling frequency with having relatively at the audio devices with relatively low sampling frequency.
In addition, the audio devices with relatively low sampling frequency with have relatively than the audio devices of high sampling frequency in can reproduce sound signal with different sampling frequencies.In addition, the present invention also can further be applied to adopt the audio devices of a new sampling frequency that increases with integral multiple.
Claims (15)
1. digital audio frequency recording device that is used for digital recording medium, this digital audio frequency recording device comprises:
Reference unit forms device, is used for receiving a pulse code modulation digital audio signal, and forms the reference unit sequence from the digital audio and video signals that is received, and each reference unit has preliminary dimension;
Receive the converting means of this reference unit sequence, be used for being transformed to conversion coefficient in a frequency domain, and output comprises a reference unit sequence of conversion coefficient belonging to the audio sample of reference unit separately;
Formatting mechanism, be used for receiving this reference unit sequence from described converting means, and utilize a kind of form in first record format and second record format to format and export the reference unit sequence that is received, wherein among the conversion coefficient in being included in reference unit separately, first record format is used for forming comprising and belongs to one first record cell of the conversion coefficient of reference unit separately, and second record format is used to form one second record cell that comprises the conversion coefficient that belongs to lower frequency region and comprises one the 3rd record cell of the conversion coefficient that belongs to higher frequency regions; With
Pen recorder is used for writing down this record cell sequence of exporting from the described formatting mechanism on this digital recording medium.
2. digital audio frequency recording device as claimed in claim 1, wherein said lower frequency region and described higher frequency regions are to come five equilibrium according to one by the represented frequency band of conversion coefficient.
3. digital audio frequency recording device as claimed in claim 1, wherein said preliminary dimension are according at record with reproduce data volume that the error that applies during the linear impulsive sign indicating number modulation digital audio signal can be corrected and definite.
4. digital audio frequency recording device as claimed in claim 1, wherein this record cell is based on according to the signal record characteristic of this digital recording medium and can be recorded in continuously that data volume on the digital recording medium determines.
5. digital audio frequency recording device as claimed in claim 1, wherein said formatting mechanism further comprises an additional data inserter, is used for for the sequence of first record cell that utilizes first record format to be produced the additional data that expression is comprised in the sampling frequency of the sound signal in this record cell sequence being inserted in the record cell sequence.
6. digital audio frequency recording device as claimed in claim 5, wherein said additional data inserter further will be illustrated in separately, and the additional data of record cell sound intermediate frequency number of samples is inserted in this record cell sequence.
7. digital audio frequency recording device as claimed in claim 1, wherein said formatting mechanism comprises an additional data inserter, one first additional data that is used for being illustrated in a sampling frequency of the sound signal that is comprised in the record cell sequence is inserted in this record cell sequence, and, identification is inserted into the start-up portion of each first and second record cell by one second additional data of resulting first record cell in same reference unit and second record cell for this record cell sequence of utilizing second record format to be produced.
8. the record format data that digital audio frequency recording device as claimed in claim 1, wherein said formatting mechanism further will be used for discerning first record format and second record format are inserted into described record cell sequence.
9. DAB transcriber comprises:
One input end, be used for receiving a kind of form of utilizing in first record format and second record format and formatted data, wherein this first record format is to be used to form first record cell that includes the conversion coefficient that belongs to each reference unit, and second record format is to be used for one the 3rd record cell that forms one second record cell of the conversion coefficient that is included in a lower frequency region among the conversion coefficient of each reference unit and be included in the conversion coefficient in a high frequency band zone being included in;
One digital-to-analog (D/A) converter is used for coming an input digital audio signal is carried out the digital-to-analog conversion according to a predetermined operating frequency;
Be connected to the device of described input end, be used for discerning the sampling frequency of the sound signal in the formatted data that are included in this input and the data of a record format and this recognition result of output expression;
The inverse format makeup is put, be connected to described input end and receive the data of exporting from the device that is used to discern, be used for to carry out inverse formatization, and the record format of being discerned of first and second record formats of storage in advance carry out inverse formatization according to the formatted data that comparison received between sampling frequency of being discerned and the predetermined operating frequency; With
Inverter, having described D/A transducer is the inverse transformation characteristic of the best, is used for being transformed to from the conversion coefficient that output is put in described inverse format makeup the audio sample a time domain, and the audio sample of gained is provided to described D/A converter.
10. DAB transcriber as claimed in claim 9, wherein said input end receives described formatted data from this digital recording medium.
11. being based on signal record characteristic according to this digital recording medium, DAB transcriber as claimed in claim 9, wherein said each record cell can be recorded in continuously that data volume on the described digital recording medium determines.
12. DAB transcriber as claimed in claim 9, wherein said lower frequency region and higher frequency regions are from coming five equilibrium by the represented whole frequency field of conversion coefficient.
13. DAB transcriber as claimed in claim 9, be that described predetermined operation frequencies multiply by under the situation of factor 2 wherein in this sampling frequency of discerning, the conversion coefficient of the low frequency region among described inverter provides the conversion coefficient that is included in first record cell is put in described inverse format makeup, and this record format of discerning is first record format.
14. DAB transcriber as claimed in claim 9, be that described predetermined operation frequencies multiply by under the situation of factor 2 wherein in this sampling frequency of discerning, described inverse format makeup is put to described inverter the conversion coefficient that is included in second record cell is provided, and institute's identification record form is second record format.
15. DAB transcriber as claimed in claim 9, wherein when described predetermined operation frequencies be that the frequency discerned is when multiply by factor 2, the makeup of described inverse format is put to described inverter provides all conversion coefficients and described inverter to carrying out zero padding for each reference unit before carrying out inverse transformation from the conversion coefficient that described inverter received.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960021573A KR100223169B1 (en) | 1996-06-14 | 1996-06-14 | System for recording and reproducing of pcm digital audio signals |
| KR21573/1996 | 1996-06-14 | ||
| KR21573/96 | 1996-06-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1173712A true CN1173712A (en) | 1998-02-18 |
| CN1146900C CN1146900C (en) | 2004-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971149836A Expired - Fee Related CN1146900C (en) | 1996-06-14 | 1997-06-14 | System for recording and/or reproducing pulse code modulation digital audio signal |
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| Country | Link |
|---|---|
| JP (1) | JP3053787B2 (en) |
| KR (1) | KR100223169B1 (en) |
| CN (1) | CN1146900C (en) |
| GB (1) | GB2314198B (en) |
| NL (1) | NL1006310C2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1069568B1 (en) | 1999-07-15 | 2006-06-21 | Micronas GmbH | Reproducing device |
| US7092340B2 (en) | 2000-07-13 | 2006-08-15 | Micronas Gmbh | Playback apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103921B (en) * | 1985-05-31 | 1988-05-04 | 夏普公司 | Pcm (pulse-code modulation) recording and playback device |
| JP2811369B2 (en) * | 1989-01-27 | 1998-10-15 | ドルビー・ラボラトリーズ・ライセンシング・コーポレーション | Short-time delay conversion coder, decoder and encoder / decoder for high quality audio |
| BR9007063A (en) * | 1989-01-27 | 1991-10-08 | Dolby Lab Licensing Corp | ENCODER, DECODER AND LOW BITRATE TRANSFORMED ENCODER / DECODER FOR HIGH QUALITY AUDIO |
| NL9000338A (en) * | 1989-06-02 | 1991-01-02 | Koninkl Philips Electronics Nv | DIGITAL TRANSMISSION SYSTEM, TRANSMITTER AND RECEIVER FOR USE IN THE TRANSMISSION SYSTEM AND RECORD CARRIED OUT WITH THE TRANSMITTER IN THE FORM OF A RECORDING DEVICE. |
| CN1062963C (en) * | 1990-04-12 | 2001-03-07 | 多尔拜实验特许公司 | Adaptive-block-lenght, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio |
| ZA921988B (en) * | 1991-03-29 | 1993-02-24 | Sony Corp | High efficiency digital data encoding and decoding apparatus |
| JP3498375B2 (en) * | 1994-07-20 | 2004-02-16 | ソニー株式会社 | Digital audio signal recording device |
-
1996
- 1996-06-14 KR KR1019960021573A patent/KR100223169B1/en not_active IP Right Cessation
-
1997
- 1997-06-13 NL NL1006310A patent/NL1006310C2/en not_active IP Right Cessation
- 1997-06-14 CN CNB971149836A patent/CN1146900C/en not_active Expired - Fee Related
- 1997-06-16 JP JP9159062A patent/JP3053787B2/en not_active Expired - Fee Related
- 1997-06-16 GB GB9712341A patent/GB2314198B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2314198A (en) | 1997-12-17 |
| JP3053787B2 (en) | 2000-06-19 |
| NL1006310C2 (en) | 1998-10-29 |
| CN1146900C (en) | 2004-04-21 |
| GB9712341D0 (en) | 1997-08-13 |
| JPH1079166A (en) | 1998-03-24 |
| NL1006310A1 (en) | 1997-12-17 |
| KR100223169B1 (en) | 1999-10-15 |
| KR980004735A (en) | 1998-03-30 |
| GB2314198B (en) | 1998-09-09 |
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