Digital audio signal recording/reproducing method and apparatus for carrying out the same

Claim 2

A rotary-head type digital audio signal recording method for recording a digital audio signal sampled at a predetermined sampling frequency together with a video signal by using rotary head means, compris­ing steps of: (a) segmenting the digital audio signal by a field period of the video signal into a predetermined number of data each constituting one processing unit; (b) arraying sampled data of the digital audio signal of the processing unit in a three-dimensional space including M samples in the vertical direction, N samples in the horizontal direction and 5 or 6 samples in the depthwise direction in dependence on the field frequency of the video signal, where M and N represent positive integers; (c) generating a first error correction code (C₁) from the data of the vertical direction while generating a second error correction code (C₂) from the data of the horizoantal direction and adding said first and second error correction codes to said three-­dimensional space; and (d) reading said sampled data and first and second error correction codes (C₁ and C₂) in the directions orthogonal to the directions in which said sampled data have been arrayed time-serially in said three-dimensional space, to thereby record the sampled data as read out on a recording medium together with the video signal of one field.

Claim 3

A digital audio signal recording method according to claim 1, said audio signal being of two channels, wherein both sample numbers M and N are selected equal to 18 (samples), respectively.

Claim 4

A digital audio signal recording method according to claim 1, wherein said three-dimensional space is segmented into two halves in the horizontal direction, one of which is allocated for a time-serial sequence of even-numbered sampled data with the other half being allocated for a time-serial sequence of odd-numbered sampled data, wherein said time-serial sequences of the even-numbered and odd-numbered sampled data are arrayed on a time-serial basis in the three-dimensional spaces allocated for the time-serial sequences of the even-­numbered and odd-numbered sampled data, respectively, in the depthwise, horizontal and vertical directions in this order, being subsequently added with said first and second error correction codes (C₁ and C₂) to said three-dimensional space; and wherein upon reading, the sampled data of the digital audio signal are read out from the three­dimensional spaces allocated for the time-serial sequences of the even-numbered sampled data and the odd-numbered sampled data, respectively, in the vertical, depthwise and horizontal directions in this order together with said first and second error correction codes (C₁ and C₂).

Claim 5

A digital audio signal recording method according to claim 1, wherein as a data capacity for said one processing unit, a capacity greater than the average number of the digital audio signal samples making appearance within one field period of the video signal is provided; the number of data to be processed is selected around said average sample number, said data being classified into plural types of modes such that the number of data in each mode does not exceed the capacity of said processing unit; and wherein synchronization processing for synchronizing the digital video signal with the video signal is realized by changing over said modes with one another.

Claim 6

A digital audio signal recording method according to claim 4, said video signal being that of a 526-line/60-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 48 KHz, two modes of 810 samples (mode 1) and 792 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 7

A digital audio signal recording method according to claim 4, said video signal being that of a 525-line/60-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 44.1 KHz, two modes of 744 samples (mode 1) and 728 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 8

A digital audio signal recording method according to claim 4, said video signal being that of a 525-line/60-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 32 KHz, two modes of 540 samples (mode 1) and 528 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 9

A digital audio signal recording method according to claim 4, said video signal being that of a 625-line/50-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 48 KHz, two modes of 972 samples (mode 1) and 948 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 10

A digital audio signal recording method according to claim 4, said video signal being that of a 625-line/50-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 44.1 KHz, two modes of 894 samples (mode 1) and 872 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 11

A digital audio signal recording method according to claim 4, said video signal being that of a 625-line/50-field system, wherein as the data processing capacity for the one processing unit of the digital audio signal per channel sampled at a sampling frequency of 32 KHz, two modes of 648 samples (mode 1) and 632 samples (mode 2), respectively, are provided; and wherein the processing for synchronizing the digital audio signal with the video signal is performed by changing over said two modes to each other in dependence on rotational periods of the rotary head system.

Claim 12

A rotary-head type digital audio signal reproducing method for reproducing a digital audio signal sampled at a predetermined sampling frequency and recorded together with a video signal, comprising steps of: (a) reading the sampled data of the digital audio signal recorded on a recording medium along with first and second error correction codes (C₁ and C₂); (b) arraying the sampled data of the digital audio signal as read out in a three-dimensional space including M samples (M is a positive integer) in a horizontal direction, N samples (N is a positive integer) in a vertical direction, and 5 or 6 samples in a depthwise direction in dependence on the field frequency of the video signal; (c) reading out the sampled data of the digital audio signal in the directions which extend, respectively, orthogonally to the directions in which the sampled data of the digital audio signal have been arrayed time-serially in said three-dimensional space; and (d) performing error correction/concealment on the sampled data of the digital audio signal with the first and second error correction codes (C₁, C₂) to thereby reproduce the original audio signal.

Claim 13

A rotary-head type digital audio signal reproducing method for reproducing a digital audio signal sampled at a predetermined sampling frequency and recorded together with a video signal, comprising steps of: (a) reading the sampled data of the digital audio signal recorded on a recording medium along with first and second error correction codes (C₁ and C₂); (b) arraying the sampled data of the digital audio signal as read out in a three-dimensional space including M samples (M is a positive integer) in a horizontal direction, N samples (N is a positive integer) in a vertical direction, and 5 or 6 samples in a depthwise direction in dependence on the field frequency of the video signal; (c) reading out the sampled data of the digital audio signal in the directions which extend, respectively, orthogonally to the directions in which the sampled data of the digital audio signal have been arrayed time-serially in said three-dimensional space; and (d) performing error correction/concealment on the sampled data of the digital audio signal with the first and second error correction codes (C₁, C₂) to thereby reproduce the original audio signal.

Claim 14

A digital audio signal reproducing method according to claim 11, said digital audio signal is of two channels, wherein both of said sample numbers M and N are selected to be equal to 18 (samples), respectively.

Claim 15

A digital audio signal reproducing method according to claim 11, wherein said three-dimensional space is segemented into two halves in the horizontal direction, one of which is allocated for a time-serial sequence of even-numbered sampled data with the other half being allocated for a time-serial sequence of odd-numbered sampled data, wherein said time-serial sequences of the even-numbered and odd-numbered sampled data are arrayed on a time-serial basis in the three-dimensional spaces allocated for the time-serial sequences of the even-numbered and odd-numbered sampled data, respectively, in the vertical, depthwise and horizontal directions in this order; wherein upon reading, the sampled data of the digital audio signal are read out from the three-­dimensional spaces for the time-serial sequence of the even-numbered sampled data and the time-serial sequence of the odd-numbered sampled data, respectively, in the depthwise, horizontal and vertical directions in this order.

Claim 16

A rotary-head type digital audio signal recording/reproducing method for recording/reproducing a digital audio signal sampled at a predetermined sampling frequency together with a video signal by using rotary head means, comprising steps of: (a) segmenting the digital audio signal by a field period of the video signal into a predetermined number of data constituting one processing unit; (b) preparing as data capacities of the one processing unit a first mode (mode 1) having a greater capacity than the average sample number of said digital audio signal within one field period of said video signal and a second mode (mode 2) having a smaller capacity than said average sample number; (c) synchronizing said digital audio signal with said video signal by changing over said first and second modes to each other in dependence on the rotational periods of said rotary head means; (d) arraying the sampled data of said digital audio signal of the one processing unit in a three-­dimensional space including M smaples (M is a positive integer) in the vertical direction, N samples (N is a positive integer) in the horizontal direction and 5 or 6 samples in the depthwise direction in dependence on the field frequency of said video signal; (e) generating a first error correction code (C₁) from the data of the vertical direction while generating a second error correction code (C₂) from the data of the horizontal direction and adding said first and second error correction codes to said three-­dimensional space; (f) reading said sampled data and said first and second error correction codes (C₁ and C₂) in the directions orthogonal to the directions in which said sampled data have been arrayed time-serially in said three-dimensional space, to thereby constitute data signal blocks for recording and recording said data signal blocks on a recording medium; and (g) upon reproduction, performing error correction/­concealment processing on the sampled data of said digital audio signal with the aid of said first and second error correction codes (C₁ and C₂) to thereby reproduce the original digital audio signal.

Claim 17

A rotary-head type digital audio signal recording/reproducing method for recording/reproducing a digital audio signal sampled at a predetermined sampling frequency together with a video signal by using rotary head means, comprising steps of: (a) segmenting the digital audio signal by a field period of the video signal into a predetermined number of data constituting one processing unit; (b) preparing as data capacities of the one processing unit a first mode (mode 1) having a greater capacity than the average sample number of said digital audio signal within one field period of said video signal and a second mode (mode 2) having a smaller capacity than said average sample number; (c) synchronizing said digital audio signal with said video signal by changing over said first and second modes to each other in dependence on the rotational periods of said rotary head means; (d) arraying the sampled data of said digital audio signal of the one processing unit in a three-­dimensional space including M smaples (M is a positive integer) in the vertical direction, N samples (N is a positive integer) in the horizontal direction and 5 or 6 samples in the depthwise direction in dependence on the field frequency of said video signal; (e) generating a first error correction code (C₁) from the data of the vertical direction while generating a second error correction code (C₂) from the data of the horizontal direction and adding said first and second error correction codes to said three-­dimensional space; (f) reading said sampled data and said first and second error correction codes (C₁ and C₂) in the directions orthogonal to the directions in which said sampled data have been arrayed time-serially in said three-dimensional space, to thereby constitute data signal blocks for recording and recording said data signal blocks on a recording medium; and (g) upon reproduction, performing error correction/­concealment processing on the sampled data of said digital audio signal with the aid of said first and second error correction codes (C₁ and C₂) to thereby reproduce the original digital audio signal.

Claim 18

A digital audio signal reproducing method according to claim 14, said digital audio signal is of two channels, wherein both of said sample numbers M and N are selected to be equal to 18 (samples), respectively.

Claim 19

A digital audio signal recording apparatus for recording a digital audio signal together with a video signal comprising: means (A: 2) for segmenting the digital audio signal inputted consecutively by a field period of the video signal; means (B: 3) for arraying sampled data of the digital audio signals resulting from said division in an address space including M samples (M is a positive integer) in the vertical direction, N sampels (N is a positive integer) in the horizontal direction and 5 or 6 samples in the depthwise direction in dependence on the field frequency of the video signal; means (C: 4) for generating a first error correction code (C₁) from the data arrayed in the vertical direction of said address space by said means (B: 3) while generating a second error correction code (C₂) from the data arrayed in the horizontal direction of said address space and adding said first and second error correction codes to said address memory; and means (D: 5, 6, 7, 8) for reading said sampled data and said first and second error correction codes (C₁ and C₂) from said address space in the directions orthogonal to the directions in which said sampled data have been arrayed in said address space and record­ing the sampled data and the first and second correction signals as read out on a recording medium (9) together with the video signal of one field.

Claim 20

A digital audio signal recording apparatus for recording a digital audio signal together with a video signal comprising: means (A: 2) for segmenting the digital audio signal inputted consecutively by a field period of the video signal; means (B: 3) for arraying sampled data of the digital audio signals resulting from said division in an address space including M samples (M is a positive integer) in the vertical direction, N sampels (N is a positive integer) in the horizontal direction and 5 or 6 samples in the depthwise direction in dependence on the field frequency of the video signal; means (C: 4) for generating a first error correction code (C₁) from the data arrayed in the vertical direction of said address space by said means (B: 3) while generating a second error correction code (C₂) from the data arrayed in the horizontal direction of said address space and adding said first and second error correction codes to said address memory; and means (D: 5, 6, 7, 8) for reading said sampled data and said first and second error correction codes (C₁ and C₂) from said address space in the directions orthogonal to the directions in which said sampled data have been arrayed in said address space and record­ing the sampled data and the first and second correction signals as read out on a recording medium (9) together with the video signal of one field.

Claim 21

A digital audio signal recording apparatus according to claim 16, said digital audio signal is of two channels, wherein both of said sample numbers M and N are selected to be equal to 18 (samples), respectively.