JPH07131753A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To form environment of special effect not only by a video image but also by an audio signal at recording and reproduction by changing a frequency characteristic of the audio signal in matching with a sepia effect of a video signal and adding a special signal to the audio signal newly. CONSTITUTION:Video information picked up by a video camera 1 is separated into a brightness signal Y and a chrominance signal C at a processing circuit 2 and they are fed to a brightness signal processing circuit 3 and a chrominance signal processing circuit 5. The circuit 3 conducts the processing such as emphasis for recording and a frequency modulator 4 converts the signal into a frequency in matching with a recording format. The chroma signal C passes through the circuit 5 and the format is matched in a low frequency conversion circuit 8 and the signal is mixed with a luminance signal at an adder 6. On the other hand, when a photographer uses a mode switch 6 to designate the sepia mode, a system controller 7 outputs an instruction of sepia processing to the circuit 5 and a switching signal to a switch 13. The circuit 5 gives the sepia signal C to a mixer 16 and gives an audio special signal to the mixer 16 via a BPF 11 and a noise generator 12 and provides an output of an adder signal to a magnetic head 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording and reproducing a video signal and an audio signal from a camera together on a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, in a camera-integrated VTR of this type, recently, instead of directly recording / reproducing an original video signal, a special effect for changing the color of the video to produce a unique atmosphere is provided. It has a function that can be applied and recorded or reproduced. One of them is shown in FIG. 4 which is a block diagram showing an example of a system for recording a light red and monochrome image called "sepia mode" as a special effect.

In FIG. 4, 1 is a video camera, 2 is a camera signal processing circuit, 3 is a luminance signal processing circuit, 4 is an FM modulator, 5 is a color signal processing circuit, 6 is a mode switch, and 7 is a system control circuit ( Hereinafter, abbreviated as “syscon”, 8 is a low frequency conversion circuit, 9 is a voice microphone, 10 is an auto gain control circuit (hereinafter, AGC), 14 is a noise low frequency circuit (hereinafter, NR), 15 is an FM modulator, 16 is an adder,
Reference numeral 17 is a magnetic head, and 18 is a magnetic tape.

An image captured by the video camera 1 is separated by a camera signal processing circuit 2 into a luminance signal Y representing a luminance component of the image and a chroma signal C representing a color component,
They are respectively sent to the luminance signal processing circuit 3 and the color signal processing circuit 5 of the recorder. The luminance signal processing circuit 3 performs processing such as emphasis for recording, and the FM modulator 4 converts the frequency into a frequency suitable for the recording format. Also,
The chroma signal C is also adjusted to the format in the low frequency conversion circuit 8 via the color signal processing circuit 5 and mixed with the luminance signal in the adder 16.

When the photographer designates the "sepia mode" with the mode switch 6, the syscon 7 detects this mode and outputs a sepia processing command to the color signal processing circuit 5. Then, the color signal processing circuit 5 does not use the transmitted chroma signal C but newly generates a chroma signal C having sepia color information and sends it to the low frequency conversion circuit 8. Low frequency conversion circuit 8
Performs similar processing on the chroma signal C of sepia color, and the adder 16 adds it to the luminance signal.

At the same time as the video signal, the audio signal is converted into an electrical signal by the audio microphone 9, and the level is controlled to an appropriate level by the AGC 10. Then, it is logarithmically compressed by the NR 14, converted into a lower frequency band by the FM modulator 15 than the luminance signal, and added by the adder 16 with the luminance and chroma signals. Finally, the added video signal and audio signal are recorded on the magnetic tape 18 by the magnetic head 17.

[0007]

However, in the conventional example as described above, the audio signal is recorded as an ordinary audio even though the video signal is sepia-colored to create a special effect atmosphere. Therefore, the special effect of the target image cannot be fully exerted, and this is halved.

The present invention has been conceived in view of the above situation, and provides a means for adding a sound effect for enhancing the special effect to the sound at the same time to emphasize the sepia effect of the image. It is an object.

[0009]

Therefore, in the present invention, the frequency characteristic of the audio signal is changed in accordance with the sepia effect of the video signal, and a special signal can be newly added to the audio signal. Therefore, the above-mentioned object is to be achieved.

[0010]

With the above-described structure of the present invention, the sound signal is simultaneously filtered in accordance with the sepia effect of the video signal, and the sound effect is added to promote the atmosphere not only by the image but also by the sound. It becomes possible to do.

[0011]

EXAMPLES The present invention will be described below based on examples. FIG. 1 shows the "sepia mode" that best represents the present invention.
4 is a configuration block diagram of one embodiment of the system (corresponding to FIG. 4), and the same (corresponding) components as in FIG.

(Structure) In FIG. 1, 1 is a video camera, 2 is a camera signal processing circuit, 3 is a luminance signal processing circuit,
4 is an FM modulator, 5 is a color signal processing circuit, 6 is a mode switch, 7 is a system control circuit (syscon), 8 is a low frequency conversion circuit, 9 is a voice microphone, 10 is an automatic gain control circuit (AGC), 11 Is a bandpass filter (hereinafter,
BPF), 12 is a noise generator, 13 is a switch, 14
Is a noise low frequency circuit (NR), 15 is an FM modulator, 16 is an adder, 17 is a magnetic head, and 18 is a magnetic tape.

(Operation) The image information captured by the video camera 1 is separated in the camera signal processing circuit 2 into a luminance signal Y representing the luminance component of the image and a chroma signal C representing the color component, and the luminance of the recorder is respectively obtained. It is sent to the signal processing circuit 3 and the color signal processing circuit 5. The luminance signal processing circuit 3 performs processing such as emphasis for recording, and
The frequency is converted by the modulator 2 to match the recording format. The chroma signal C also passes through the color signal processing circuit 5, is adjusted to the format in the low frequency conversion circuit 8, and is mixed with the luminance signal in the adder 16.

When the photographer specifies the "sepia mode" with the mode switch 6, the syscon 7 detects this mode and outputs a sepia processing command to the color signal processing circuit 5 and a switching signal to the switch 13. Then, the color signal processing circuit 5 does not use the transmitted chroma signal C but newly generates a chroma signal C having sepia color information and sends it to the low frequency conversion circuit 8. The low frequency conversion circuit 8 applies the same processing to the chroma signal C of sepia color, and the adder 16 adds it to the luminance signal.

Next, at the same time as the video signal, the audio signal is converted into an electric signal by the audio microphone 9 and the level is changed to AGC1.
At 0, it is controlled to an appropriate level. Here, in the embodiment of the present invention, one of the outputs is directly sent to the switch 13 and the other is sent to the BPF 11.

The BPF 11 is a voice filter having a frequency characteristic, an example of which is shown in FIG. 2, and is close to the characteristic of a voice filter of a radio in the early days, for example. Since the slope from the pass band to the stop band has almost a first-order filter characteristic, the pass band is very narrow. This is because it was difficult to realize a high-order filter with an early audio device filter.

After applying the frequency characteristic of the initial sound effect of the audio equipment by the BPF 11, the noise generator 12 generates noise of the waveform as shown in a to f of FIG. Add. As shown in the figure, this noise is randomly added from random (a, b, d, f) to small (c, f) up and down the dynamic range even in terms of level. . Then, it is sent to the changeover switch 13.

In this way, the normal audio signal and the audio signal subjected to the special effect are input to the switch 13, and are switched by the syscon 7. Syscon 7
When processing the video signal in sepia color, simultaneously controls the changeover switch 13 to switch the audio signal to the special effect side.

After that, the audio signal is logarithmically compressed by NR14, converted into a lower frequency band than the luminance signal by the FM modulator 15, and added by the adder 16 with the luminance and chroma signals. Then, the added video signal and audio signal are
Data is recorded on the magnetic tape 18 by the magnetic head 17.

Here, in the above configuration, B
The processing of the PF 11 and the noise generator 12 is configured to operate in the normal recording mode, but by providing another changeover switch in front of the BPF 11,
It can be configured to operate only in sepia mode.

Further, in this embodiment, the special effect is applied at the time of recording, but naturally, the same processing can be performed at the time of reproducing. Then, these processes can be realized by either analog signal processing or digital signal processing.

[0022]

As described above, according to the present invention,
For example, in accordance with the "sepia effect" of the initial video equipment of the video signal, the audio signal is filtered so that it sounds like that of an early radio, and at the same time random noise is added, so that not only the video It is now possible to create an atmosphere of special effects with sound, both during recording and playback.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment.

FIG. 2 is a frequency characteristic diagram of an audio filter.

FIG. 3 is a diagram showing an example of a noise waveform added to an audio signal.

FIG. 4 is a configuration block diagram of an example of a conventional special effect system.

[Explanation of symbols]

 1 Video Camera 2 Camera Signal Processing Circuit 3 Luminance Signal Processing Circuit 4 FM Modulator 5 Color Signal Processing Circuit 6 Mode Switch 7 Syscon 8 Low-pass Converter 9 Audio Microphone 10 AGC 11 Band Pass Filter 12 Noise Generator 13 Changeover Switch 14 NR 15 FM modulator 16 Adder 17 Magnetic head 18 Magnetic tape

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kobayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus characterized in that the frequency characteristic of an audio signal is changed according to the sepia effect of a video signal so that a special signal can be newly added to the audio signal.