JP2003022502A - Signal processing device and method, recording medium and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a rotary transformer, by suppressing the crosstalk. SOLUTION: By a driver, the rise of a power transmission control signal inputted from a control part is detected, and in accordance with this timing, a clock inputted from a clock output part at this time is amplified to produce a power signal and the outputting of the power signal to a power transmission channel of the rotary transformer is started. By the driver, when the outputting of power signal is started, the power signal is outputted so that the amplitude is linearly increased to become the specified size (into the ramp state) as shown by a voltage waveform B in a figure 11. Thus, by outputting the power signal into the ramp state at the start of the power transmission, the crosstalk with respect to a recording channel is reduced as shown by a voltage waveform A in the figure 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device and method, a recording medium, and a program, and in particular, by superimposing a control signal on the electric power transmitted through a rotary transformer, the structure can be simplified. Signal processing device and method, recording medium, and program.

[0002]

2. Description of the Related Art For example, in a VTR (Video Tape Recorder), an amplifier is arranged in a rotary drum, and a recording head and the amplifier are connected at a short distance so that they are less susceptible to external noise. There is. However, in this case the amplifier must be powered.

FIG. 1 shows an example of the configuration in which the slip ring 4 is used to supply power to the amplifier in the rotary drum 2.

The electric power generated in the stationary drum 1 as the stationary portion is supplied to the amplifier in the rotating drum 2 rotating on the stationary drum 1 as the rotating portion via the slip ring 4.

The slip ring 4 is in contact with the brushes 5, and the brushes 5 are insulated by the insulating ring 6 as shown in FIG. The magnetic head 3 of the rotary drum 2 performs recording or reproduction on a tape (not shown).

FIG. 3 is a cross-sectional view of the rotary transformer 11 which supplies power to the amplifier in the rotary drum via the power supply winding (power transmission channel 12).

The rotary transformer 11 includes a power transmission channel 12, two short rings 13, and recording channels 14-1 and 14-2 corresponding to two channels (hereinafter, referred to as a recording channel 14 when it is not necessary to distinguish them from each other). .
The same applies to other parts), and the reproduction channels 15-1 and 15-2 for two channels, and each channel is formed by the magnetic field generated between the windings arranged in each groove. Signals are sent and received at.

Recording signals output from the recording channels 14-1 and 14-2 are amplified by an amplifier (not shown) in the rotary drum and then supplied to corresponding recording heads (not shown). Then, the recording head records the data on, for example, a magnetic tape.

The reproduction channels 15-1 and 15-2 have
Reproduced signals from corresponding reproducing heads (not shown) amplified by corresponding amplifiers (not shown) are input. The reproducing head and the recording head for two channels respectively correspond to the magnetic head 3 in FIG.

The power signal output from the power transmission channel 12 is supplied to an amplifier for recording or reproduction.

The short ring 13 includes a power transmission channel 12 and a signal channel (recording channels 14-1,
14-2, and playback channels 15-1, 15-2)
It is provided in order to suppress the crosstalk between and.

However, in the example of FIG. 1 described above, the structure is complicated, the cost is high, and the apparatus is large, and in the example of FIG. 3, too, the rotary transformer 11 has a large number of grooves.
However, there was a problem that it became large.

For example, with respect to the example of FIG. 3, as shown in FIG. 4, it is conceivable that the short ring 13 has one groove. However, in this case, since crosstalk between the power transmission channel 12 and the signal channel cannot be suppressed sufficiently, as shown in FIG. A rotary transformer 11 having one channel 15 is also proposed.

As shown in FIG. 6, the reproducing head of the channel CH1 reproduces the signal recorded on the magnetic tape by following the track on the magnetic tape while the rotating drum makes a half rotation. And when the rotary drum rotates half a turn,
The reproducing head of the channel CH1 is separated from the magnetic tape, and the reproducing head of the channel CH2 abuts on the magnetic tape instead. The reproducing head of the channel CH2 reproduces the signal recorded on the next track of the magnetic tape during the remaining half rotation.

That is, as shown in the example of FIG. 5, while the reproducing head has two channels, the reproducing channel 15
When there is only one channel, the output of the amplifier for amplifying the reproduction signal of the reproduction head of the channel CH1 and the output of the amplifier for amplifying the reproduction signal of the reproduction head of the channel CH2 are reproduced every half rotation of the rotary drum during reproduction. Can be switched to.

Note that the recording heads for two channels also record signals on the magnetic tapes by alternately following the tracks of the magnetic tapes by one half turn, similarly to the reproducing heads described above.

By the way, in the case of the example of FIG. 5, the power transmission to the amplifier for amplifying the reproduction signal is as follows.
It starts immediately before the start of reproduction and is stopped immediately after the end of reproduction.
That is, in order to save power consumption, power is supplied only during reproduction.

Further, at the start of power transmission, as shown by the voltage waveform B of the power signal in FIG. 7, a unit-step (step-shaped) power signal is output, and at the time of stopping power transmission, the power signal in FIG. As shown in the voltage waveform B of FIG.

However, if a stepwise power signal is output when power transmission is started or stopped,
It is known that a current component having a frequency lower than the frequency of the power signal is added to the current flowing through the power transmission channel 12.

A low-frequency signal added here causes a low crosstalk as shown in the crosstalk characteristic of FIG. 9, so that, for example, the recording channel 14 shown in FIG.
Further, as indicated by the current waveform A in FIG. 8, a current affected by crosstalk (a current to which a frequency lower than the frequency of the power signal is added) flows. The range of the current waveform A in FIGS. 7 and 8 is 5 mA / div.

For example, if a crosstalk current flows into the recording channel 14 when the recording head is in contact with a recording medium (for example, a magnetic tape), a signal which should not be recorded is recorded and a reproduction SNR is generated. Deteriorates, and the reproduction error rate deteriorates.

Further, even when the recording head is not in contact with the recording medium, if a low-frequency current flows through the recording head, the recording head is magnetized and the performance of the recording head deteriorates.

Therefore, for example, as in the example of FIG.
When electric power is supplied to two heads by a rotary transformer having one signal channel, there is a problem that crosstalk to the signal channel cannot be sufficiently suppressed.

The present invention has been made in view of such a situation, and it is possible to sufficiently suppress crosstalk.

[0024]

The signal processing device of the present invention is a transmission / reception means for transmitting / receiving a signal via a rotary transformer between a stationary portion and a rotating portion which is rotated relative to the stationary portion. And a supply unit that supplies a power signal from the stationary unit to a circuit inside the rotating unit, the supply unit increasing the amplitude of the power signal linearly when starting the supply of the power signal. It is characterized in that the power signal is outputted so as to have a constant magnitude, and when the supply of the power signal is stopped, the power signal is outputted so that the amplitude thereof linearly decreases so as to have a constant magnitude.

The rotating unit has a two-channel head for recording or reproducing a signal on a recording medium, the rotary transformer has one transmission channel for the two-channel head, and the supply means is When the recording head is not in contact with the recording medium, the supply of the power signal can be started and stopped.

The signal processing method of the present invention comprises a step of transmitting and receiving a signal via the rotary transformer between the stationary portion and the rotating portion which is rotated relative to the stationary portion, and the stationary portion, And a supplying step of supplying a power signal to a circuit inside the rotating part, the supplying step having the amplitude of the power signal linearly increasing to a constant magnitude when the supply of the power signal is started. In addition to the above output, when the supply of the power signal is stopped, the power signal is output so that its amplitude linearly decreases and has a constant magnitude.

The program of the recording medium of the present invention comprises a transfer control step for controlling transfer of a signal via a rotary transformer, which is performed between the stationary part and a rotating part which is rotated relative to the stationary part. And a supply control step of controlling the supply of the power signal from the stationary part to the circuit inside the rotating part, wherein the supply control step linearly increases the amplitude of the power signal when the supply of the power signal is started. And control the output of the power signal so that it becomes a certain size.
When the supply of the electric power signal is stopped, the output of the electric power signal is controlled so that the amplitude of the electric power signal linearly decreases and becomes a constant magnitude.

The program of the present invention is executed between the stationary part and the rotating part which is rotated relative to the stationary part.
The computer is caused to execute a transfer control step for controlling the transfer of a signal via the rotary transformer and a supply control step for controlling the supply of the power signal from the stationary section to the circuit inside the rotating section. When the supply of the power signal is started, the output of the power signal is controlled so that the amplitude of the power signal increases linearly and becomes a constant magnitude. It is characterized in that the output of the power signal is controlled so that the amplitude linearly decreases to a constant magnitude.

In the signal processing device and method and the program of the present invention, signals are transmitted and received via the rotary transformer between the stationary portion and the rotating portion that is rotated relative to the stationary portion, and the stationary portion is stationary. When the power signal is supplied from the part to the circuit inside the rotating part and the supply of the power signal is started, the power signal is output so that its amplitude linearly increases and becomes a certain magnitude, and the power signal is output. When the supply of the signal is stopped, the power signal is output so that its amplitude decreases linearly and has a constant magnitude.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 10 shows an example of the structure of a fixed drum and a rotary drum of a rotary transformer relating to the present invention. The configuration of the rotary transformer here is the same as that in FIG. 5, and the reproduction channel 15 is one channel.

The control section 51 on the fixed drum side, based on a separately input command for starting reproduction or command for ending reproduction,
The clock output control signal is set to H level or L level and is output to the clock output unit 52.

The control unit 51 also sets the power transmission control signal to the H level or the L level based on the reproduction start command or the reproduction end command and the reproduction amplifier switching signal A, and causes the driver 53 to set it. Output.

The reproducing amplifier switching signal A is set to H level when the reproducing head 71-1 is in contact with the magnetic tape, and is L level when the reproducing head 71-2 is in contact.
It is considered as a level. That is, as shown in FIG. 6, the reproduction amplifier switching signal A is H level every half cycle of the rotary drum.
This is a signal that switches between the level and the L level.

The clock output section 52 detects the rising edge of the clock output control signal input from the control section 51,
The clock output to the driver 53 is started according to the timing. The clock output unit 52 also detects the falling edge of the clock output control signal and stops the output of the clock to the driver 53 according to the timing.

The driver 53 detects the rising edge of the power transmission control signal input from the control unit 51, amplifies the clock input from the clock output unit 52 at that time, and generates a power signal according to the timing. , Starts output of an electric power signal to the electric power transmission channel 12 of the rotary transformer 11. When the driver 53 starts the output of the power signal, the amplitude of the power signal is linearly increased to a constant magnitude (in a ramp shape) as shown in the voltage waveform B of FIG. 11. Output.

The driver 53 also detects the fall of the power transmission control signal and stops the output of the power signal to the power transmission channel 12 in accordance with the timing.
When the output of the power signal is stopped, the driver 53 outputs the power signal so that its amplitude linearly decreases to 0 (in a ramp shape) as shown by the voltage waveform B in FIG.

In this way, by outputting the power signal in a ramp shape at the start and stop of power transmission, as shown in the voltage waveform A of FIGS. 11 and 12, the power transmission channel 12 to the recording channel 14 are shown. Crosstalk can be reduced. The waveform A in FIGS. 11 and 12 shows the waveform of the current flowing in the recording channel 14 at 1 mA / div.

Returning to FIG. 10, the power signal transmitted to the rotary drum through the power transmission channel 12 is rectified by the rectifying circuit 6.
1 is supplied. The rectifier circuit 61 rectifies and smoothes the input power signal and outputs it to the regulator 62. The regulator 62 stabilizes the power signal input from the rectifier circuit 61, and uses the resulting DC voltage of a predetermined voltage level as the power source for the amplifier 65-1 and the amplifier 65-2.
Supply to each of.

The switch switching unit 63 generates a switching signal based on the reproduction amplifier switching signal B corresponding to the reproduction amplifier switching signal A input to the control unit 51 on the fixed drum side, and switches the switch 64. That is, when the reproducing amplifier switching signal A is at the H level (the reproducing head 7
(When 1-1 is in contact with the magnetic tape), the switch 64 is switched to be connected to the amplifier 65-1 by the reproducing amplifier switching signal B at that time. Further, when the reproducing amplifier switching signal A is at the L level (the reproducing head 71
-2 is in contact with the magnetic tape), the switch 64 causes the amplifier 64 to switch to the amplifier 6
It is switched to connect with 5-2.

The reproducing amplifier switching signal B can be obtained by decoding, for example, when the reproducing amplifier switching signal A is superimposed on the power signal.

The amplifier 65-1 or the amplifier 65-2 is
Power is supplied from the regulator 62, and the reproduction signal input from the reproduction head 71-1 or the reproduction head 71-2 is amplified. Amplifier 65-1 or amplifier 65-2
When connected to the switch 64, outputs an amplified reproduction signal to the reproduction channel 15 via the switch 64.

The recording signal output from the recording channel 14-1 is supplied to the recording head 72-1 of the channel CH1, and the recording signal output from the recording channel 14-2 is supplied to the recording head 72-2 of the channel CH2. Supplied.

FIG. 13 shows how the reproducing head 71 and the recording head 72 are mounted on the rotary drum. The reproducing head 71-1 and the reproducing head 71-2 are mounted 180 degrees apart from each other. Recording head 7
2-1 is attached at a distance of 67 degrees from the reproducing head 71-1 in the rotating direction of the rotary drum, and is attached to the recording head 7-1.
2-2 is attached at a distance of 46 degrees from the recording head 72-1 in the rotational direction.

That is, as shown in FIG. 13, at the timing when the reproducing head 71-1 separates from the magnetic tape and the reproducing head 71-2 instead contacts the magnetic tape, the recording heads 72-1 and 72- No. 2 is not in contact with the magnetic tape.

Next, the operation on the fixed drum side will be described with reference to the flowchart of FIG. Note that the control unit 51 informs the reproduction amplifier switching signal A as shown in FIG.
Is entered.

When a reproduction start command is input from the operation unit (not shown) in step S1, the control unit 51 sets the clock output control signal to the H level as shown in FIG. 15B in step S2. Set. As a result, the clock output unit 52 starts outputting the clock to the driver 53, as shown in FIG.

Next, in step S3, the controller 51
Detects the falling edge of the reproducing amplifier switching signal A indicated by the downward arrow of the solid line in FIG. 15 (A), and at that timing, as shown in FIG. 15 (D), changes the power transmission signal to H level. Set to level. This allows the driver 53
Outputs the power signal in a ramp shape as shown by the voltage waveform B in FIG. 11, and starts outputting the power signal to the power transmission channel 12.

The reproducing amplifier switching signal A is supplied to the reproducing head 7.
Since 1-1 is set to the H level when the reproducing head 71-2 is in contact with the magnetic tape, and L is set when the reproducing head 71-2 is in contact, the reproducing amplifier switching signal A falls at the timing of The positional relationship between the reproducing head 71 and the recording head 72 is as shown in FIG. That is, the output of the power signal is started when the recording head 72 is not in contact with the magnetic tape.

As described above, when the recording head 72 is not in contact with the magnetic tape, the output of the electric power signal is started to output the electric power signal in the form of a ramp. You can avoid being affected by talk.

In step S4, the control unit 51 waits until a reproduction end command is input, and when the command is input, the control unit 51 proceeds to step S5 and, for example, a downward arrow of a dotted line in FIG. As shown in FIG. 15 (D), the power transmission control signal is detected at the timing when the fall of the reproduction amplifier switching signal A is detected, that is, at the timing when the recording head 72 is not in contact with the magnetic tape. L
Set to level. As a result, the driver 53 outputs the power signal in a ramp shape as shown in the voltage waveform B of FIG. 12, and stops the output of the power signal to the power transmission channel 12.

As described above, when the recording head 72 is not in contact with the magnetic tape, the output of the electric power signal is stopped to output the electric power signal in the form of a ramp. You can avoid being affected by talk.

Next, in step S6, the controller 51
In step S5, the clock output control signal is set to the L level as shown in FIG. 15B after a predetermined time has elapsed since the power transmission control signal was set to the L level. As a result, the clock output unit 52 stops the clock output, as shown in FIG.

Then, the process ends.

The series of processes described above can be realized not only by hardware but also by software. When a series of processes is realized by software, a program that constitutes the software is installed in a computer, and the program is executed by the computer so that the fixed drum and the rotating drum described above are functionally realized. It

FIG. 16 is a block diagram showing the configuration of an embodiment of the computer 101 functioning as the fixed drum and the rotating drum as described above. CPU (Central P
The input / output interface 116 is connected to the rocessing unit) 111 via the bus 115.
When a user inputs a command from the input unit 118 including a keyboard and a mouse via the input / output interface 116, for example, a ROM (Read Only Memor
y) 112, hard disk 114, or drive 1
20, a magnetic disk 131 and an optical disk 13 to be mounted on
2. Magneto-optical disk 133 or semiconductor memory 13
Program stored in a recording medium such as
(Random Access Memory) 113 is loaded and executed. As a result, the various processes described above are performed. Further, the CPU 111 outputs the processing result to an LCD (Liquid Crystal Dielectric) via, for example, the input / output interface 116.
It is output to the output unit 117 including a splay) as needed. The program is the hard disk 114 or RO
It is stored in the M112 in advance and provided to the user integrally with the computer 101, or the magnetic disk 131, the optical disk 132, the magneto-optical disk 133, the semiconductor memory 1
Provided as package media such as 34, satellite,
It can be provided to the hard disk 114 from the network or the like via the communication unit 119.

[0056]

According to the signal processing device and method and the program of the present invention, signals are transmitted and received between the stationary portion and the rotating portion which is rotated relative to the stationary portion via the rotary transformer. Then, when the power signal is supplied from the stationary unit to the circuit inside the rotating unit and the supply of the power signal is started, the power signal is output so that its amplitude linearly increases and becomes a constant magnitude. Then, when the supply of the power signal is stopped, the power signal is output so that its amplitude linearly decreases and becomes a constant magnitude. Therefore, for example, crosstalk is suppressed and the rotary transformer is It can be miniaturized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a conventional rotary drum.

FIG. 2 is a side view showing the configuration of the slip ring 4 of FIG.

FIG. 3 is a sectional view showing a configuration of a conventional rotary transformer.

FIG. 4 is a cross-sectional view showing a configuration example of another conventional rotary transformer.

FIG. 5 is a cross-sectional view showing a configuration example of another conventional rotary transformer.

FIG. 6 is a diagram illustrating a track of a magnetic tape.

FIG. 7 is a diagram showing a voltage waveform and a current waveform of a power signal.

FIG. 8 is another diagram showing a voltage waveform and a current waveform of a power signal.

FIG. 9 is a diagram showing crosstalk characteristics.

FIG. 10 is a block diagram showing a configuration example of a fixed drum and a rotating drum to which the present invention has been applied.

FIG. 11 is another diagram showing a voltage waveform and a current waveform of a power signal.

FIG. 12 is another diagram showing a voltage waveform and a current waveform of a power signal.

FIG. 13 is a diagram showing a mounting state of a reproducing head and a recording head.

FIG. 14 is a flowchart illustrating an operation on the fixed drum side.

FIG. 15 is a timing chart illustrating an operation on the fixed drum side.

16 is a block diagram showing a configuration example of a personal computer 101. FIG.

[Explanation of symbols]

11 rotary transformer, 12 power transmission channel, 13 short ring, 14 recording channel, 15 reproducing channel, 51 control unit, 52
Clock output section, 53 driver, 61 rectifier circuit, 62 regulator, 63 switch switching section,
65 amplifier, 71 reproducing head, 72 recording head

Claims (5)

[Claims] 1. A transfer means for transferring a signal between a stationary part and a rotating part which is rotated relative to the stationary part via a rotary transformer; Supply means for supplying a power signal to an internal circuit, the supply means, when starting the supply of the power signal,
The power signal is output so that its amplitude linearly increases to a constant magnitude, and when the supply of the power signal is stopped, the power signal is linearly reduced in amplitude. A signal processing device characterized by outputting so as to have a constant size. 2. The rotating unit has a two-channel head for recording or reproducing a signal on a recording medium, and the rotary transformer has one transmission channel for the two-channel head. The supply means starts the supply of the power signal and stops the supply of the power signal when the recording head is not in contact with the recording medium. The signal processing device described. 3. A transfer step of transferring a signal via a rotary transformer between a stationary part and a rotating part which is rotated relative to the stationary part; A step of supplying a power signal to an internal circuit, the supplying step, when starting the supply of the power signal, increases the amplitude of the power signal linearly to become a constant magnitude. In addition to the above, when the supply of the electric power signal is stopped, the electric power signal is output so that its amplitude linearly decreases to a constant magnitude. 4. A transfer control step of controlling transfer of a signal via a rotary transformer, which is performed between a stationary part and a rotating part which is rotated relative to the stationary part, and the stationary part from the stationary part. A supply control step of controlling supply of a power signal to a circuit inside the rotating part, wherein the supply control step linearly increases an amplitude of the power signal when supply of the power signal is started. Control the output of the electric power signal so that the electric power signal has a constant magnitude, and when the supply of the electric power signal is stopped, the amplitude of the electric power signal linearly decreases to a constant magnitude. A recording medium having a computer-readable program recorded thereon, which controls the output of the power signal. 5. A transfer control step of controlling transfer of a signal via a rotary transformer, which is performed between a stationary part and a rotating part which is rotated relative to the stationary part, and the stationary part from the stationary part. A computer executes a supply control step of controlling supply of a power signal to a circuit inside the rotating unit, and the supply control step is such that when the supply of the power signal is started, the amplitude of the power signal is linear. The output of the power signal is controlled so as to increase to a constant value, and when the supply of the power signal is stopped, the amplitude of the power signal linearly decreases to a constant value. To control the output of the electric power signal.