JP3223105B2 - Signal recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus for recording a video signal and / or an audio signal on a recording medium such as a video tape recorder (VTR) or reproducing the signal from the recording medium.

[0002]

2. Description of the Related Art Conventionally, analog VTRs have been widely used as devices for recording or reproducing video signals and audio signals. In an analog VTR, various signal processes are performed at the time of signal recording / reproduction in order to reproduce a signal as faithfully as possible in an original picture or original sound. However,
Depending on the type of signal to be recorded, the processing may rather increase the interference, or the signal may not be reproduced as intended by the photographer or program creator when recording the signal. For example, when the signal processing for emphasizing high frequency is performed at the time of recording while reproducing the high frequency at the time of reproduction, noise may increase at the time of signal reproduction. In addition, there arises a problem that a viewer adjusts the screen excessively brightly at the time of reproduction of an image recorded by the creator with the intention of creating an image having a dark atmosphere with a reduced brightness.

[0003] In recent years, a transition has been made from a system in which signal recording and reproduction are performed in analog to a system in which signal recording and reproduction are performed in digital. In a digital signal recording / reproducing apparatus, signal deterioration is largely suppressed, and accordingly, a digital video signal or a digital audio signal is input to the signal recording / reproducing apparatus, or The performance of an input / output device for outputting a signal output from a device is important.

For example, in a camera-integrated VTR,
In the conventional analog system, the performance of the camera part exceeded the performance of the recording / reproduction part, but in the digital system, the performance of the recording / reproduction part was dramatically improved. This will affect the image quality and sound quality. Therefore, especially for digital VT
In R, it is not always preferable to leave the adjustment of the signal processing characteristics at the time of signal reproduction, for example, the frequency characteristics of the filter, to the user's discretion in faithful signal reproduction.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal recording / reproducing apparatus in which signal processing characteristics during signal reproduction are automatically and optimally adjusted according to the conditions during signal recording. .

[0006]

A signal recording apparatus according to the present invention records, on a recording medium, a condition relating to a signal input source at the time of recording a video signal and / or an audio signal on the recording medium. It is. According to the signal recording device, the signal input at the time of signal recording is performed together with the video signal and / or the audio signal.
Source conditions , such as camera aperture and gain, are recorded on the recording medium.
By reading out the condition relating to the signal input source and adjusting the signal processing characteristic according to the condition, the signal is always reproduced under the optimum signal processing characteristic regardless of the user's arbitraryness.

Further, the signal reproducing apparatus according to the present invention is recorded on a recording medium together with a video signal and / or an audio signal.
A condition relating to a signal input source at the time of signal recording is read, and a signal processing characteristic at the time of signal reproduction is adjusted according to the read condition. According to the signal reproducing apparatus, in advance, at the time of signal recording, together with the video signal and / or audio signal, the signal input
By recording the conditions related to the power source , for example, the aperture and the gain of the camera, on the recording medium, at the time of signal reproduction, the conditions relating to the signal input source are read from the recording medium and adjusted to the signal processing characteristics according to the conditions. I can do it. Thus, signal reproduction is always performed under the optimum signal processing characteristics regardless of the user's arbitraryness.

[0008]

According to the signal recording / reproducing apparatus of the present invention, the signal processing characteristics during signal reproduction can be automatically and optimally adjusted according to the conditions during signal recording.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a camera-integrated digital VTR will be specifically described below with reference to the drawings. According to the standard of the consumer digital VTR, each track of the magnetic tape includes a recording area for video data, a recording area for audio data, a recording area for subcode, a video auxiliary area (VAUX), and an audio auxiliary area (AAUX). ) Etc. are provided. A memory chip called an MIC (memory-in-cassette) is attached to a cassette case in which a magnetic tape is stored.

As shown in FIG. 1, the signal recording system of the digital VTR according to the present invention includes a condition setting circuit (1) for setting various conditions during signal recording. Condition setting circuit
(1) is a condition of a video signal input from the signal input terminal (2), for example, a source code “camera” indicating that the signal input source is a camera, and information “iris indicating an aperture direction of a lens”. "And the information" gain is high "indicating the gain of the CCD amplifier are supplied to the signal processing circuit (3). The setting of the condition by the condition setting circuit (1) can be performed based on the data input by the user. However, the condition can be automatically set by, for example, taking in information from a camera unit.

A video signal from the camera section is supplied to a signal input terminal.
The digital audio signal is supplied from (2) to the signal processing circuit (3), is converted into a digital video signal, and is mixed with the condition data supplied from the condition setting circuit (1). The condition data is, for example, VA
UX and supplied to the recording circuit (4). The recording circuit (4) records all data on a magnetic tape (5) according to a predetermined recording format.

A signal reproducing system of a digital VTR according to the present invention is configured as shown in FIG. 2, and a digital signal recorded on a magnetic tape (5) is reproduced by a reproducing circuit (6) and a signal processing circuit (3). Supplied to Signal processing circuit (3)
Separates the condition data (source code, lens information, gain information) contained in the reproduced digital signal and sends it to the condition processing circuit (7). The condition processing circuit (7) determines an optimal signal processing characteristic according to the condition data, and in this embodiment, determines a parameter for defining the frequency characteristic.
The signal is supplied to the signal processing circuit (3).

In the signal processing circuit (3), the digital signal supplied from the reproduction circuit (6) is subjected to necessary processing such as data expansion in a preceding signal processing section (not shown), and then processed. The latter signal is the digital signal input terminal shown in FIG.
The signal is supplied from (12) to the digital filter (9). Also, the parameters determined by the condition processing circuit (7) are input to the digital filter (9) from the parameter input terminal (11), thereby defining the frequency characteristics of the digital filter (9).

For example, in the above-described example where the source code "camera", lens information "iris is in the aperture direction", and gain information "high gain" are recorded at the time of signal recording,
Parameters for changing the standard frequency characteristic shown by the solid line in FIG. 4 to the frequency characteristic that raises the middle band and suppresses the high band as shown by the two-dot chain line are created and supplied to the digital filter (9). As a result, the digital filter (9) is adjusted to the frequency characteristic indicated by the two-dot chain line. By passing through the digital filter (9), the digital video signal is free of camera-specific noise.

The digital video signal passed through the digital filter (9) is converted into an analog video signal via a D / A converter (10), and then output from a signal output terminal (8).
As a result, a high-quality image from which noise peculiar to the camera has been removed is displayed on a display (not shown).

As described above, according to the signal recording / reproducing apparatus of the present invention, at the time of signal recording, the equipment is set so as to faithfully record the signal on the original picture or original sound, and at the time of signal reproduction, the conditions for the signal recording are satisfied. Since the reproduction characteristics can be optimally adjusted in accordance with this, it is possible to perform signal reproduction sufficiently reflecting the intentions of the photographer and the program creator.

In the above-described embodiment, the recording / reproducing processing of the video signal has been described. However, similarly, for the audio signal, the condition at the time of signal recording, for example, the distinction between outdoor and indoor, the strength of the wind,
It is possible to record the type of music (rock, classical music, etc.) together with the audio signal on a recording medium, read out the recording conditions when reproducing the signal, and set an optimal reproduction characteristic for the condition. In the above embodiment, the recording condition is recorded in the subcode area or VAUX of the magnetic tape. However, the recording condition is not limited to this, and the recording condition can be recorded in the MIC (memory-in-cassette) provided in the cassette case. It is.

The description of the above embodiments is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims. For example, the present invention can be implemented in a recording-only machine or a reproduction-only machine.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a signal recording system of a signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a signal reproduction system of the above device.

FIG. 3 is a block diagram illustrating a configuration of a main part of a signal processing circuit of a signal reproduction system.

FIG. 4 is a graph showing a change in a frequency characteristic of a digital filter.

[Explanation of symbols]

 (1) Condition setting circuit (3) Signal processing circuit (4) Recording circuit (5) Magnetic tape (6) Reproduction circuit (7) Condition processing circuit (9) Digital filter

Claims (4)

(57) [Claims] 1. A signal recording apparatus for recording a video signal and / or an audio signal on a recording medium, wherein conditions relating to a signal input source at the time of signal recording are recorded on the recording medium. 2. A camera comprising a camera unit and a signal recording unit,
The signal according to claim 1, wherein the signal input source is a camera unit.
Recording device . 3. A signal input source for recording a signal recorded together with a video signal and / or an audio signal on a recording medium.
Reads the condition, signal reproducing apparatus characterized by adjusting a signal processing characteristic at the time of signal reproduction in accordance with the read condition. 4. When recording a video signal and / or an audio signal on a recording medium, conditions relating to a signal input source at the time of signal recording are recorded on the recording medium, and at the time of signal reproduction, a video signal and / or an audio signal are recorded from the recording medium. Signal input during signal recording with signal
A signal recording / reproducing apparatus, which reads a condition relating to a source and adjusts a signal processing characteristic at the time of signal reproduction according to the read condition.