Rotary head type recording/reproducing method and apparatus

Claim 2

In a rotary-head type video recorder apparatus for recording a video signal on a recording medium by means of a rotary head controlled on the basis of said video signal, a method of recording a digitized audio signal by said rotary head, said method comprising: a step of detecting a difference between a rate at which the digital audio signal is recorded on the recording medium and which is determined by the video signal and a rate of input data determined by a sampling frequency of the audio signal for a number N of samples of the digital signal to be included within one field period synchronized with the video signal; a step of setting the number of samples for the input data by preparing on the basis of the result of detection of said difference in rate at least two types of fields including a first field containing a number of samples greater than said number N within said one field period and a second field containing a number of samples smaller than said number N within said one field period; a block forming step for preparing blocks for recording said digitized audio signal on said recording medium, wherein said digitized audio signal is added with a first error detection/correction code every n symbols for thereby forming a first code arrangement, while each of the symbols of said arrangement is imparted with amounts of delay differing from one another and subjected to diagonal incomplete interleave for thereby forming a second code arrangement by adding a second error detection/correction code, said second code arrangement being added with a block synchronizing signal; and a step of setting the number of blocks to be recorded within said one field period synchronized with said video signal to a predetermined constant number of blocks capable of recording a greater number of data than said sample number N independent of said set number of samples.

Claim 3

A recording method according to Claim 1, wherein said recording medium is constituted by a magnetic tape, the numbers of samples in said first and second fields being selected to be even numbers, respectively.

Claim 4

A recording method according to Claim 2, wherein when the number of samples in one block is given by m , the number of samples within one field is selected equal to m × a (where a represents an integer), said field being data field having a period differing from that of said video field, the period of said data field remaining constant for the video signal in either NTSC system or CCIR system.

Claim 5

A magnetic recording apparatus of rotary-head type for recording a digitized audio signal (L m ; R m ) on a recording medium together with a video signal by means of a rotary head (32) controlled on the basis of said video signal, comprising: detecting means (50; 51) for detecting a difference between a rate at which the digital audio signal is recorded on the recording medium and which is determined by the video signal and a rate of input data determined by a sampling frequency of the audio signal for a number (e.g. 800.8) of samples of the digital signal to be included within one field period synchronized with the video signal; sampling number setting means (52; 53) for setting the number of field samples for the input data by preparing on the basis of the output of said detecting means at least two types of fields including a first field containing a number of samples greater than said sample number N within said one field period and a second field containing a number of samples smaller than said sample number N within said one field period; block forming means (15-19, 21, 24) including a memory for preparing blocks for recording said digitized audio signal on said recording medium, said block forming means including first encoding means for adding said digitiz­ed audio signal with a first error detection/correction code every n symbols, dispersion means for dispersing data through diagonal interleave by applying amounts of delay to each symbols outputted from said first encoding means, second encoding means for adding said dispersed data with a second error detection/correction code, and means for adding the output of said second encoding means with a block synchro­nizing signal, the number of said blocks recorded within one field period synchronized with said video signal being a constant number capable of recording a greater number of data than said sample number (N) independent of said sample setting means; and output means responding to the output of said block forming means to thereby create audio information signal to be recorded on said tape.

Claim 6

A magnetic recording apparatus of rotary-head type for recording a digitized audio signal (L m ; R m ) on a recording medium together with a video signal by means of a rotary head (32) controlled on the basis of said video signal, comprising: detecting means (50; 51) for detecting a difference between a rate at which the digital audio signal is recorded on the recording medium and which is determined by the video signal and a rate of input data determined by a sampling frequency of the audio signal for a number (e.g. 800.8) of samples of the digital signal to be included within one field period synchronized with the video signal; sampling number setting means (52; 53) for setting the number of field samples for the input data by preparing on the basis of the output of said detecting means at least two types of fields including a first field containing a number of samples greater than said sample number N within said one field period and a second field containing a number of samples smaller than said sample number N within said one field period; block forming means (15-19, 21, 24) including a memory for preparing blocks for recording said digitized audio signal on said recording medium, said block forming means including first encoding means for adding said digitiz­ed audio signal with a first error detection/correction code every n symbols, dispersion means for dispersing data through diagonal interleave by applying amounts of delay to each symbols outputted from said first encoding means, second encoding means for adding said dispersed data with a second error detection/correction code, and means for adding the output of said second encoding means with a block synchro­nizing signal, the number of said blocks recorded within one field period synchronized with said video signal being a constant number capable of recording a greater number of data than said sample number (N) independent of said sample setting means; and output means responding to the output of said block forming means to thereby create audio information signal to be recorded on said tape.

Claim 7

A rotary-head type magnetic recording apparatus according to Claim 4, wherein the numbers of samples in said first and second field assume even numbers, respectively.

Claim 8

A rotary-head type magnetic recording apparatus according to Claim 4, said digitized audio signal being of 16-bits two-channel signal resulted from sampling at a sampling frequency of 48 KHz with eight bits constituting one symbol, each of said blocks including one symbol, each of said blocks including 24 symbols of data for six samples of two channels, and an error correction code, wherein for one field of video signal of 525 lines/60 fields, 135 blocks are recorded, and the number of samples within one field is so selected that 810 samples are recorded in said first field with 792 samples being recorded in said second field for each channel of audio signal.

Claim 9

A rotary-head type magnetic recording apparatus according to Claim 4, said digitized audio signal being of 16-bits two-channel signal resulted from sampling at a sampling frequency of 48 KHz with eight bits constituting one symbol, each of said blocks including one symbol, each of said blocks including 24 symbols of data for six samples of two channels, and an error correction code, wherein for one field of video signal of 625 lines/50 fields, 162 blocks are recorded, and the number of samples within one field is so selected that 972 samples are recorded in said first field with 948 samples being recorded in said second field for each channel of audio signal.

Claim 10

A rotary head type magnetic recording apparatus according to Claim 6, wherein said 16-bit data is located within one block of recording pattern.

Claim 11

A rotary-head type magnetic recording apparatus according to Claim 8, wherein said 16-bit data located one block by means of said second encoding means.

Claim 12

A digital audio signal recording/reproducing apparatus in a rotary-head type recording/reproducing system for recording/reproducing video signal and audio signal on and from a magnetic tape by means of the rotary head controlled on the basis of the video signal, comprising: signal reproduction processing means (15-20, 23, 27, 37-38) including an encoding circuit for encoding the digitized audio signal to an error detection correction code, a dispersion circuit for dispersing said encoded data through diagonal incomplete interleave, a block creating circuit for setting said dispersed data in blocks, a modulating circuit (36) for modulating said block data, a rotary-head type scanner (31, 43) for recording said modulated signal on the magnetic tape together with the video signal, and reproducing means for demodulating said modulated audio signal picked up by said scanner through deinterleave processing; field generating means (21, 45) including a memory for generating a block group containing a predeter­mined number of said blocks in the form of one field; an address control circuit (53) provided in association with said memory for generating two types of fields including at least a first field containing a greater number of audio signal samples than the number N of field to be included within said field period and a second field containing a smaller number of audio signal samples than said number N; rate difference detecting circuit (50, 51) for detecting a difference between a rate at which said digitized audio signal is inputted and a rate at which said audio signal is recorded on said magnetic tape; and a sample number setting circuit (52) responding to the output of said rate difference detection circuit for thereby controlling said address control circuit for selecting one of said first and second fields is selected, to thereby set a number of audio signal samples to by recorded, whereby the difference in time lag involved in the reproduction processing between the video signal and the digital audio signal is reduced.

Claim 13

A digital audio signal recording/reproducing apparatus in a rotary-head type recording/reproducing system for recording/reproducing video signal and audio signal on and from a magnetic tape by means of the rotary head controlled on the basis of the video signal, comprising: signal reproduction processing means (15-20, 23, 27, 37-38) including an encoding circuit for encoding the digitized audio signal to an error detection correction code, a dispersion circuit for dispersing said encoded data through diagonal incomplete interleave, a block creating circuit for setting said dispersed data in blocks, a modulating circuit (36) for modulating said block data, a rotary-head type scanner (31, 43) for recording said modulated signal on the magnetic tape together with the video signal, and reproducing means for demodulating said modulated audio signal picked up by said scanner through deinterleave processing; field generating means (21, 45) including a memory for generating a block group containing a predeter­mined number of said blocks in the form of one field; an address control circuit (53) provided in association with said memory for generating two types of fields including at least a first field containing a greater number of audio signal samples than the number N of field to be included within said field period and a second field containing a smaller number of audio signal samples than said number N; rate difference detecting circuit (50, 51) for detecting a difference between a rate at which said digitized audio signal is inputted and a rate at which said audio signal is recorded on said magnetic tape; and a sample number setting circuit (52) responding to the output of said rate difference detection circuit for thereby controlling said address control circuit for selecting one of said first and second fields is selected, to thereby set a number of audio signal samples to by recorded, whereby the difference in time lag involved in the reproduction processing between the video signal and the digital audio signal is reduced.