Method and apparatus for recording and reproducing a digital signal

Claim 3

A method of recording and reproducing a digital signal according to claim 1, wherein the N-bit digital video signal at the lower bit side of the (N+M)-bit digital signal is positioned such that the most significant bit of the digital video signal corresponds to the lest significant bit of the (N+M)-bit digital signal.

Claim 5

A recording apparatus comprising: mixing means for forming (N+M)-bit digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as higher bits and an M-bit digital video signal as lowerbits; and recording means for recording the (N+M)-bit digital signal from said mixing means on a recording medium.

Claim 6

A recording apparatus comprising: mixing means for forming (N+M)-bit digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as higher bits and an M-bit digital video signal as lowerbits; and recording means for recording the (N+M)-bit digital signal from said mixing means on a recording medium.

Claim 7

A recording apparatus according to claim 4, wherein the M-bit digital video signal at the lower bit side of the (N+M)-bit digital signal is positioned by said mixing means such that the most significant bit of the digital video signal corresponds to the lest significant bit of the (N+M)-bit digital signal.

Claim 8

A recording apparatus according to one of claims 4 and 5, wherein said recording means includes a rotary magnetic head so as to record the (N+M)-bit digital signal on a magnetic tape.

Claim 9

A reproducing apparatus, comprising: reproducing means for reproducing (N+M)-bit digital signal (N, M: positive integers) from a recording medium, said recording medium storing the (N+M)-bit digital signal consisting of an N-­bit digital audio signal as higher bits and an M-bit digital video signal as lower bits; and separation means for separating the N-bit digital audio signal the M-bit digital video signal from the (N+M)-bit digital signal reproduced by said reproducing means.

Claim 10

A reproducing apparatus, comprising: reproducing means for reproducing (N+M)-bit digital signal (N, M: positive integers) from a recording medium, said recording medium storing the (N+M)-bit digital signal consisting of an N-­bit digital audio signal as higher bits and an M-bit digital video signal as lower bits; and separation means for separating the N-bit digital audio signal the M-bit digital video signal from the (N+M)-bit digital signal reproduced by said reproducing means.

Claim 11

A reproducing apparatus according to claim 7, wherein said reproducing means includes a rotary magnetic head so as to reproduce the (N+M)-bit digital signal on a magnetic tape.

Claim 12

A signal processing apparatus, comprising: a first analog-to-digital converter for converting an analog audio signal into an N-bit digital audio signal (N: positive integer) in response to a first sampling clock; a second analog-to-digital converter for converting an analog video signal into an N-bit digital audio signal (M: positive integer) in response to a second sampling clock; timing conversion means for converting a timing of the M-bit digital video signal from said second analog-to-digital converter such that the digital video signal is synchronized with the first sampling clock; and mixing means for forming (N+M)-bit digital signal by mixing the N-bit digital audio signal from said first analog-to-digital converter as higher bits and the M-bit digital video signal from said timing conversion means as lower bits.

Claim 13

A signal processing apparatus, comprising: a first analog-to-digital converter for converting an analog audio signal into an N-bit digital audio signal (N: positive integer) in response to a first sampling clock; a second analog-to-digital converter for converting an analog video signal into an N-bit digital audio signal (M: positive integer) in response to a second sampling clock; timing conversion means for converting a timing of the M-bit digital video signal from said second analog-to-digital converter such that the digital video signal is synchronized with the first sampling clock; and mixing means for forming (N+M)-bit digital signal by mixing the N-bit digital audio signal from said first analog-to-digital converter as higher bits and the M-bit digital video signal from said timing conversion means as lower bits.

Claim 14

A signal processing apparatus comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means includes memory means having at least a pair of memories, an input selection switch is provided at the input side of said memory means and is operated in an postrecording mode, said input selection switch receives an input video signal and a reproduced video signal from said memory means, the reproduced video signal read from one memory of said memory means is written in another one of memory through said input selection switch when the postrecording mode is selected, and the video signal read from said another memory and to be recorded is coincided with the reproduced video signal read from said one memory.

Claim 15

A signal processing apparatus comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means includes memory means having at least a pair of memories, an input selection switch is provided at the input side of said memory means and is operated in an postrecording mode, said input selection switch receives an input video signal and a reproduced video signal from said memory means, the reproduced video signal read from one memory of said memory means is written in another one of memory through said input selection switch when the postrecording mode is selected, and the video signal read from said another memory and to be recorded is coincided with the reproduced video signal read from said one memory.

Claim 16

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, in a recording operation, after said memory means acquires one scene of the M-bit digital video signal, a start code is added to the N-bit digital audio signal having relation with the M-bit digital video signal, and both the digital signals are applied to said mixing means, and in a reproducing operation, after the start code is detected from the N-bit digital audio signal from said separation means, the M-bit digital video signal having relation with the N-­bit digital audio signal is read from said memory means.

Claim 17

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, in a recording operation, after said memory means acquires one scene of the M-bit digital video signal, a start code is added to the N-bit digital audio signal having relation with the M-bit digital video signal, and both the digital signals are applied to said mixing means, and in a reproducing operation, after the start code is detected from the N-bit digital audio signal from said separation means, the M-bit digital video signal having relation with the N-­bit digital audio signal is read from said memory means.

Claim 18

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, and said memory means is control led for the M-bit digital video signal mixed first by said mixing means in connection with the N-bit digital audio signal such that a scene of at least the M-bit digital video signal is displayed in a line sequential manner until said memory means acquires one scene ina reproducing operation.

Claim 19

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, and said memory means is control led for the M-bit digital video signal mixed first by said mixing means in connection with the N-bit digital audio signal such that a scene of at least the M-bit digital video signal is displayed in a line sequential manner until said memory means acquires one scene ina reproducing operation.

Claim 20

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, a function switch is provided such that said memory means acquires the M-bit digital video signal in a desired timing manner during a recording operation, and said memory means acquires the M-bit digital video signal of a plural sequential scenes determined by the capacity of said memory means when said function switch is activated.

Claim 21

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as a higher bits and an M-bit digital video signal, the N-­bit digital audio signal being obtained by digitizing in response to a first sampling clock, the M-bit digital video signal being obtained by digitizing in response to a second sampling clock and processing through a timing conversion means; and separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; wherein the M-bit digital video signal from said separation means is processed by said timing conversion means, said timing conversion means is constructed by memory means, a function switch is provided such that said memory means acquires the M-bit digital video signal in a desired timing manner during a recording operation, and said memory means acquires the M-bit digital video signal of a plural sequential scenes determined by the capacity of said memory means when said function switch is activated.

Claim 22

A signal processing apparatus according to one of claims 9, 10, 11, 12 and 13, wherein the first sampling clock is a sampling clock based on a signal format of a digital audio tape recorder, and the second sampling clock is a sampling clock having a frequency equal to an integral multiple of a color subcarrier frequency.

Claim 23

A signal processing apparatus, comprising: identification code adding means for adding a predetermined identification code to an M-bit digital video signal (M: positive integer); mixing means for forming an (N+M)-bit recording digital signal (N: positive integer) by mixing an N-bit digital audio signal as higher bits and the M-bit digital video signal as lower bits having the identification code added by said code adding means; separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; and means for detecting the identification code from the M-bit digital video signal having the identification code from said separation means and for controlling to detect at least the M-bit digital video signal in accordance with the identification code.

Claim 24

A signal processing apparatus, comprising: identification code adding means for adding a predetermined identification code to an M-bit digital video signal (M: positive integer); mixing means for forming an (N+M)-bit recording digital signal (N: positive integer) by mixing an N-bit digital audio signal as higher bits and the M-bit digital video signal as lower bits having the identification code added by said code adding means; separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; and means for detecting the identification code from the M-bit digital video signal having the identification code from said separation means and for controlling to detect at least the M-bit digital video signal in accordance with the identification code.

Claim 25

A signal processing apparatus, comprising: first bit inverting means for inverting a desired bit of an M-bit digital video signal (M: positive integer); mixing means for forming an (N+M)-bit recording digital signal (N: positive integer) by mixing an N-bit digital audio signal as higher bits and the M-bit digital video signal from said first bit inverting means as lower bits; separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; and second bit inverting means for inverting again the bit of the M-bit digital video signal from said separation means, said bit being inverted by said first bit inverting means.

Claim 26

A signal processing apparatus, comprising: first bit inverting means for inverting a desired bit of an M-bit digital video signal (M: positive integer); mixing means for forming an (N+M)-bit recording digital signal (N: positive integer) by mixing an N-bit digital audio signal as higher bits and the M-bit digital video signal from said first bit inverting means as lower bits; separation means for separating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; and second bit inverting means for inverting again the bit of the M-bit digital video signal from said separation means, said bit being inverted by said first bit inverting means.

Claim 27

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as higher bits and an M-bit digital video signal as lower bits; separation means for seuarating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; a character generator for generating a video signal of an image to be superimposed; and means for inserting the video signal from said character generator into the reproduced video signal from said separation means, wherein a predetermined image can be superimposed on the scene of the reproduced video signal.

Claim 28

A signal processing apparatus, comprising: mixing means for forming an (N+M)-bit recording digital signal (N, M: positive integers) by mixing an N-bit digital audio signal as higher bits and an M-bit digital video signal as lower bits; separation means for seuarating the N-bit digital audio signal and the M-bit digital video signal from the reproduced (N+M)-bit digital signal; a character generator for generating a video signal of an image to be superimposed; and means for inserting the video signal from said character generator into the reproduced video signal from said separation means, wherein a predetermined image can be superimposed on the scene of the reproduced video signal.