JPH0729305A - Recording method - Google Patents

Abstract

PURPOSE: To automatically control with a sequence controller by utilizing the whole range of available digital value or the whole dynamic range of a recording medium or both of them. CONSTITUTION: In the case of recording a digital signal with the recording medium in order to prepare the master of an optical disk, after previously storing the largest digital record level value, a digital source parameter value, corresponding to the largest signal level of a complete first path 12T of a source material 12, is determined. And a control signal is pulled out by determining a scaling control signal in accordance with the relative value of a digital record reference parameter value and digital source parameter value. Thereafter, the source material 12 reproduced between a second path 12C is scaled inn a straight line shape in accordance with the control signal, and the scaled digital signal is recorded on the optical disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording system and a recording method for recording a signal on a recording medium.

[0002]

2. Description of the Related Art When recording a source signal on a recording medium,
It is often necessary to modify the source signal before recording.
For example, when recording audio tracks on a recording medium such as tape or compact disc, each track has the same peak level so that the user does not have to adjust the volume of the recorded material between tracks during playback. It is desirable to have.

In particular, when using digital recording, the source material has a maximum recordable binary value set to a peak in order to fully utilize the range of available digital values and / or the available dynamic range. It is desirable to record at the signal level. Traditionally, when making a compact disc (CD) master in a recording studio, the signal level of the source material is manually "on the fly" during the production of the CD master recording. In other words, the adjustments are being made while recording the material.

The conventional method has many disadvantages. First of all, the manual adjustment method is too time consuming and error prone. For example, a level that is too low may be set so that the maximum dynamic range is not utilized, or a level that is too high may be set and a digital overload (beyond the level recording) may occur. Also, if the signal is continuously adjusted in a hurry, the relative signal level of the original recording in the recording target path will not be faithfully reproduced.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the above problems.

[0006]

According to a first aspect of the present invention, there is provided a recording system for recording a signal on a recording medium, the recording system reproducing (a) a source material. Means and (b) a control device connected to the reproduction means for receiving the source material reproduced in the first pass (stage) to derive a control signal corresponding to any parameter of the reproduced source material. , (C) for the purpose of processing the source material reproduced in the second pass and modifying the parameters according to the control signal,
Reproduction means for receiving the source material reproduced in the second pass, and a signal processing device connected to the control device for receiving the control signal extracted from the first pass, and (d) processed into a recording medium. Recording means connected to the signal processing device for recording the source material.

In this manner, the present invention allows one or more parameters of the source material to automatically meet the requirements for recording on the recording medium. The invention has particular, but not exclusive, application to the recording of digital signals on a recording medium. If the parameter is the signal level of the source material being played, then using the present invention, the recording level of the source material will be the full range of available digital values, the available dynamic range of the recording medium, or both. It can be automatically adjusted for availability.

The control device for deriving the control signal is
(A) means for storing a recording reference parameter value; and (b)
It is desirable to have means for determining the source parameter value from the reproduced source material, and (c) means for determining the control signal according to the relative value of the recording reference parameter value and the source parameter value.

The signal processing device preferably linearly scales the reproduced source material according to the control signal, so that the relative signal level of the source material is kept at the recorded material.

To adjust the signal level of the source material for the purpose of maximizing the available range of digital values or the available dynamic range of the recording medium (eg optical disc), the recording reference parameter values are, for example, recorded. It is a maximum signal level for recording on a medium or a compact disc, and the source parameter value determining means may determine the source signal value of the maximum signal level from the first pass of the source material.

In the recording system, during the first pass (a), the reproducing means first reproduces the entire source material, and the control device extracts the control signal, and (b) during the second pass, Let the playback means play the source material again,
A sequence control device may be provided which causes the control device to output a control signal, causes the signal processing device to process the reproduced source material according to the control signal, and causes the recording means to record the processed source material.

In an embodiment of the invention for recording a digital signal on a recording medium, (a) the player outputs a digital source material signal, and (b) the controller stores the maximum digital recorded value. Means, a source parameter value determining means for determining a digital source parameter value corresponding to the maximum signal level of the first pass of the source material, and a scaling control signal according to a relative value of the digital reference parameter value and the digital source parameter value. Means for determining, (c) the signal processor linearly scales the reproduced source material according to the scaling control signal, and (d) the recording means linearly scales the recording medium. Record the digital signal.

The present invention is particularly suitable for, but not limited to, making a master of an optical recording medium such as an optical disc, where the maximum digital recording value is for recording information on the optical disc.

According to the second aspect of the present invention, there is provided a recording method for recording the source material of the reproducing means on the recording medium by using the recording means, the recording method comprising (a) the source in the first pass. In a second pass, the steps of playing the material, (b) deriving a control signal corresponding to the parameters of the source material to be played, and (c) adjusting the parameters of the source material to be played according to the control signal. Processing the source material; and (d) recording the processed source material on a recording medium.

The invention also includes a method for making a compact disc master, which comprises the steps defined above, further followed by the step of using the recording of the recording medium as a master for making an optical disc.

According to still another aspect of the present invention, there are provided a recording medium and an optical disc recorded according to the method of the present invention.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is an overall block diagram of a recording system 10 according to the present invention for recording a digital audio signal on a recording medium used as a master for manufacturing optical discs.

The recording system 10 includes a source material player 12, such as a conventional voice recording / playback machine, and a recorder 1 which may also be a conventional voice recording / playback machine.
4 is provided. The recording / playback machine may be a conventional tape machine, a solid state recording / playback device, or implemented in any other suitable technique.
Also, while the description assumes that the recording system is used to record audio information, it is equally applicable to recording video or other signals.

The output of the player 12 is a signal processor 16 that modifies one or more parameters of the player's output before being sent to the recorder 14 for recording via the audio signal connection 14S. To the audio signal connection 16S.

The control signal generator 18 is also connected to the output of the player 12 via the audio signal connection 16S. The system controller 20 is connected to receive prerecorded time control signals from the player 12 via connection 12T and from the recorder 14 via connection 14T. The time control signal is pre-recorded in the conventional way by "PRE-STRIPE" recording. In addition, the system control device 20 uses the connection 1
It is connected to the player 12 via 2C, to the recorder 14 via connection 14C, and to the control signal generator 18 via connection 18C. The control signal generation device 18 is connected to the signal processing device 16 via the connection 16C. The connection indicated by the solid line represents an audio signal path (road), and the connection indicated by the dotted dash line represents the control signal path. of course,
In another example of the invention for processing information signals other than audio signals (such as video), the information signals are sent via the signal connection "S", which is represented using solid lines.

The player 12 and the recorder 14 are provided with conventional control inputs so that their operation can be operated remotely, for the player 12 the current position in the source material and for the recorder 14 for recording. A conventional time code output is provided to indicate the time control signal.

The system controller 20 can be implemented in any suitable manner to perform the following functions. Desirably, the system controller is the connection 12T, 1
The 2C, 14T, 14C and 18C are preferably implemented in the form of appropriately programmed microprocessor based controllers connected to them by conventional interfaces. The system controller can be programmed with an initial time control signal and a final time control signal that define the beginning and end of the source material and the recording to be made using conventional user operable input devices.

From this, the operation of the recording system of FIG.
This will be described with reference to the flowchart of FIG.

In step S21, the system controller 20
Sends a control signal to the player 12 via the control path 12C, which starts the reproduction of the source material. At the same time, the system controller sends a command to the control signal generator 18 via the control path 18C, thereby initiating the process of deriving a control signal for controlling the signal processor 16. The system controller uses the time control signal provided on connection 12T to monitor the operation of player 12.

In step S22, the system controller 20
Causes the player to replay all the source material, during which time the control signal generator 18 monitors at least one parameter of the source material output from the player for the purpose of generating a control signal in the manner described below.

At the end of this first pass of source material, in step S23, the system controller causes the player to reset the source material. For example, if player 12 is a tape player, resetting player 12 is to rewind the tape to the beginning of the source material.

At step S24, the system controller
Causes the player to start playing the source material and, at about the same time, causes the recorder 14 to start recording. The exact timing of the player and recorder start is adjusted to take into account the time delay associated with the physical configuration of the player and recorder device and the particular configuration of the signal processing device 16, as is well known to those skilled in the art. Control signals for controlling the player 12 and the recorder 14 are respectively
Provided by the system controller via control connections 12C and 14C. The system controller monitors the current positions of player 12 and recorder 14 using time control signals provided via connections 12T and 14T, respectively.

In step S25, the system control unit
Second pass of source material to player (stage action)
And the source material output from the player is
It is processed by the signal processor 16 according to the control signal CS from the control signal generator 18. The output of the signal processor forms the signal recorded by the recorder 14.
At the end of the source material detected by the time control signal on connection 12T, the system controller ends the recording process in step S26.

The recording (recorded) recorded on the recording medium by the recorder 14 can be used in a conventional manner as a master for recording an optical disc.

FIG. 3 details step S22 of FIG. 2 for deriving the control signal.

In step S31, the variable MAXSIG is set to zero. The variable MAXSIG is player 1
Used to indicate the maximum signal level of source material from 2.

In step S32, the first source material signal SIG is received from the player 12. In step S33, the absolute value (ie magnitude) of the received signal SIG is compared with the variable MAXSIG. Since SIG can be positive or negative in an audio system, S
Compare the absolute values of IG. If the signal SIG has a higher absolute value than indicated by the value of MAXSIG, then in step S34, MAXSIG is set equal to the absolute value of SIG. Otherwise, the value of MAXSIG is unchanged. In step S35, the signal SIG is further added.
Is received, control is returned to step S33. If not received, control passes to step S36. When the control proceeds to S36, it means that the first pass of the source material from the player 12 is completed.

In step S36, the control signal (CS) value is set equal to the value RECMAX divided by the value MAXSIG. The value RECMAX indicates the maximum allowable recording value for the recording medium used by the recorder 14. For example, if the recording made by the recorder 14 is later used as a compact disc master recording, the value RECMA
X is equal to the maximum digital value that can be stored on the optical disc. For example, in the conventional 16-bit audio system, the maximum recordable value is 7FF (hexadecimal number) and the maximum negative value is 800 (hexadecimal number). Therefore, in this case, RECMAX is set to 7FF (hexadecimal number).
In step S37, the value of CS is stored.

FIG. 4 is a schematic block diagram of an apparatus suitable for performing the method steps of FIG. Player 12
The continuous source material signal SIG from
It is received via the signal connection 18S into 0. The absolute value of the contents of register 60 is compared to the contents of register 62 which is used to hold the maximum signal level MAXSIG of undetected source material. Register 62 is initially reset to zero in response to a signal from control unit 74 on input R. Thereafter, registers 60 and 62 are clocked in response to control signals from control unit 74 to their respective inputs C. The comparator 64 is also responsive to the control input from the control unit 74 to compare the current values in the registers 60 and 62.

When comparator 64 determines that the absolute value SIG in register 60 is greater than the value MAXSIG in register 62, the comparator outputs an output bit to AND gate 66, which causes the value in register 60 to register 62. It is latched and the value of MAXSIG is updated. In this way, the value of MAXSIG will be the value of SIG that has not yet been received during the first pass of the source material.
Corresponds to (matches) the maximum value of.

At the end of the first pass of the source material,
The value of MAXSIG in register 62 corresponds to the highest signal level of the source material.

The register 68 stores the maximum signal level RECMAX that can be recorded on the recording medium of the recorder 14. Register 68 may include an input (not shown) from system controller 20 to change the value stored therein depending on the particular recording medium used. Alternatively, register 68 may be a read-only memory if the control system is used to record on a stand-alone recording medium.

After the completion of the first pass (step S36 in FIG. 3), the RECMAX value in the register 68 is divided by the value of MAXSIG in the register 62 using the divider 70, and its output is controlled by the control signal (CS). ) Stored in register 72.

FIG. 5 is a flow diagram illustrating the steps of recording the source material on the recording medium by the recorder during the second pass of the source material. In step S51, the first signal SIG is received by the player 12. In step S52, the value of SIG is multiplied by the control signal CS. In step S53, the processed SIG value is recorded on the recording medium. Step S5
At 4, if more signal SIG to be recorded is present (ie, if the end of the second pass has not yet been reached), control is returned to S52. Otherwise (at the end of the second pass of the source material), control transfers to step S55 and the process ends.

FIG. 6 is a schematic diagram of the signal processing device 16. In principle, the signal processing device changes the value of the control signal CS by
A multiplier 76 is provided for multiplying the value of SIG received by the signal processing device 16. The SIG output value is then passed to the recorder 14 for recording.

The control signal CS (CS = RECMA) formed by dividing the maximum allowed recording signal level by the maximum signal level of the source material detected during the first pass.
X / MAXSIG) and then multiply each source material signal by this control signal (corrected SIG
= SIG * CS), a linear scaling operation is performed on each of the source material's signals, and the signal levels are adjusted accordingly to fit properly within the range of signal levels available for recording (dynamic range). Expand or shrink. In other words, the value MAXSI
The signal with G exhibits the maximum recordable value RECMAX when multiplied by CS (ie the modified MAX
SIG = MAXSIG * (RECMAX / MAXSI
G) = RECMAX), signals with lower signal levels are scaled proportionally. In particular, in the case of a digital recording device that can perform scaling operation arithmetically,
The present invention allows for the maximum and accurate use of the available range of digital values and / or the available dynamic range.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these embodiments only, and the invention as defined by the appended claims is defined. It should be understood that various changes and modifications can be made by those skilled in the art without departing from the scope and spirit.

Thus, for example, although the invention has been described with particular reference to digital recording devices, it should be understood that the invention is equally applicable to analog recording devices.
Further, in the described embodiment, the separate player and recorder are provided, but in another embodiment of the present invention, these may be realized by the composite type recording / reproducing apparatus.

Although the invention has been described as modifying the signal level of the source material, the invention is also applicable to other parameters that require adjustment before recording. Rather than measuring the level of each signal in the source material, only selected signals may be sampled in a particular embodiment. The signal to be sampled can be local in the source material or scattered in the source material.

In a particular embodiment, linear scaling was performed by the signal processor 16, but alternative scaling operations could be performed, for example by using a suitable function generator where signal compression is utilized. further,
In the previous embodiment, only the signal level was changed, but in other embodiments a certain number of parameters are combined, measured and used with a function generator to produce a more complex signal from the player 12. Could be modified.

In the described embodiment, a fixed processing standard (ie, the single control signal CS) was used, but in other embodiments it may be desirable to change to the processing standard through the source material. For example, different maximum signal levels MAXSIG are detected on different paths of the source material and different control signals CS are generated for each of the paths, thereby individually adjusting the peak levels of the different paths of the source material. You can also do it.

In the described embodiment, the time control signal is PRE
Although pre-recorded on the recording medium by -STRIPE recording, in other embodiments, the time control signal can be recorded in real time along with the voice signal or other signals.

Although the recording system preferably comprises a system controller to fully automate the recording, the present invention also provides a manually controlled recording system without the use of a system controller.

The present invention is particularly suitable for use as a master for optical discs, but is generally applicable in connection with recording information on other recording media. Indeed, the present invention is not limited to recording audio information, but is recognized as being suitable for use in recording video and other signals.

[0050]

As described above, according to the present invention, it is possible to record the full range of available digital values or the available dynamic range or both of them, which is time-consuming as in the past. Automatic control is possible without the need for manual adjustment.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a recording system (embodiment) according to the present invention.

2 is an overall flow diagram of the operation of the system of FIG.

3 is a flow diagram illustrating steps for deriving control signals for use in the system of FIG.

FIG. 4 is a schematic block diagram showing an example of a control signal generation device of the system of FIG.

FIG. 5 is a flow diagram of processing source material for recording.

6 is a schematic diagram showing an example of a signal processing device of the system of FIG.

[Explanation of symbols]

 12 player (reproducing means) 18 control signal generating device (control device) 16 signal processing device 14 recorder (recording means)

Claims (19)

[Claims] 1. A recording system for recording a signal on a recording medium, comprising: (a) means for reproducing source material; and (b) said means for receiving the source material reproduced in a first pass. A controller connected to the reproduction means for deriving a control signal corresponding to any parameter of the reproduced source material, and (c) connected to the reproduction means for receiving the source material reproduced in the second pass. And connected to the control device to receive the control signal extracted in the first pass, processing the source material reproduced in the second pass, and modifying the parameter according to the control signal A signal processing device; and (d) recording means connected to the signal processing device for recording the processed source material on a recording medium. Recording system to do. 2. The recording system according to claim 1, wherein the digital signal is recorded on a recording medium. 3. The recording system according to claim 1, wherein the parameter is a signal level of the reproduced source material. 4. The recording system according to claim 1, wherein:
The control device (a) means for storing a recording reference parameter value; (b) means for determining a source parameter value from the reproduced source material; (c) the recording reference parameter value and the source parameter value. And a means for determining the control signal according to the relative value of the recording system. 5. The recording system according to claim 4, wherein:
A recording system in which the recording reference parameter value is a maximum signal level for recording, and the source parameter value determining means determines a source parameter having a maximum signal level from the first pass of the source material. 6. The recording system according to claim 5, wherein:
A recording system in which the signal processing device linearly scales the reproduced source material according to the control signal. 7. The recording system according to claim 1, wherein:
(A) during the first pass, the reproducing means reproduces the complete source material for the first time, causing the control device to extract the control signal, and (b) during the second pass, the reproducing means. The source material is reproduced for the second time, the control device is caused to output the control signal, the signal processing device is caused to process the reproduced source material according to the control signal, and the recording means is subjected to the processed source material. A recording system comprising a sequence control device for recording the. 8. The recording system according to claim 1, wherein:
(A) the reproducing means outputs a digital material signal, and (b) means for the control device to store the maximum digital recording value as a digital recording reference parameter value,
Source parameter value determining means for determining a digital source parameter value corresponding to the maximum signal level from the first pass of the source material, and in response to the relative value of the digital recording reference parameter value and the digital source parameter value. And (c) the signal processing device linearly scales the reproduced source material according to the scaling control signal, and (d) the recording device linearly scales the recording medium. A recording system for recording a digital signal that has been scaled into a shape. 9. A recording method for recording source material from a reproducing means on a recording medium using the recording means,
(A) playing the source material in a first pass, and (b) deriving a control signal corresponding to the parameters of the played source material.
(C) processing the source material in a second pass and adjusting the parameters of the reproduced source material according to the control signal; and (d) recording the processed source material on a recording medium. Recording method including. 10. The recording method according to claim 9, wherein a digital signal is recorded on the recording medium. 11. The recording method according to claim 9, wherein the parameter is a signal level of the reproduced source material. 12. The recording method according to claim 9, wherein
(A) the method includes the step of pre-storing a recording reference parameter value, and (b) the step of deriving a control signal corresponding to any parameter of the reproduced source material, the reproduced source material. And a substep of determining a source parameter value from the step of determining the control signal according to a relative value of the recording reference parameter value and the source parameter value. 13. The recording method according to claim 12, wherein:
A recording method wherein the recording reference parameter value is a maximum signal level for recording and the source parameter value is a maximum signal level from the first pass of source material. 14. The recording method according to claim 13, wherein
A recording method in which the signal processing device linearly scales the reproduced source material according to the control signal. 15. The recording method according to claim 9, wherein during the first pass automatic control of the reproduction of the complete source material and the determination of the control signal during the second pass. A recording method comprising the second reproduction of the source material, output of the control signal, the processing of the reproduced source material according to the control signal, and the recording of the processed source material. 16. The recording method according to claim 9, wherein the digital signal is recorded on the recording medium, wherein the source material is supplied as a digital signal, and (a) the method outputs a maximum digital recording level value. Pre-storing as digitally recorded reference parameter values,
(B) deriving a control signal corresponding to any parameter of the reproduced source material, determining a digital source parameter value corresponding to the maximum signal level from the complete first pass of the source material; Determining a scaling control signal according to the relative value of the digital recording reference parameter value and the digital source parameter value, (c) the reproduced source material is linearly scaled according to the scaling control signal, (D) A recording method in which a linearly scaled digital signal is recorded on the recording medium. 17. A method for recording an optical disc, comprising: (a) recording on a master using the recording method according to claim 9; and (b) using the master to create an optical disc. 18. A recording medium recorded according to claim 9. 19. A compact disc recorded by the method of claim 17.