JP2625726B2 - Recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus which captures image information and sound information, and integrates the capturing means and the recording means.

2. Description of the Related Art In recent years, camera-integrated VTRs, which integrate a video camera equipped with a CCD image sensor and a VTR, have been rapidly becoming popular because they have become smaller, lighter, and offered at relatively inexpensive prices. I'm starting.

FIG. 8 shows an external view of a conventional camera-integrated VTR. FIG. 9 is an external view as viewed from the back side of FIG.

In FIG. 8, 101 is an optical lens, and 100 is a main body. 102 is a microphone. In Fig. 5, 103
Is a cassette containing a magnetic tape. Reference numeral 104 denotes a cassette storage unit.

The so-called VTR section is housed in the main body of 100 (not shown). The image obtained from the optical lens 101 and the sound obtained from the microphone 102 are recorded on the magnetic tape of the cassette 103. In addition, it can be reproduced.

Problems to be Solved by the Invention In the above-described configuration, vibrations generated from the main body 100 (for example, vibrations called hum of a power supply or the like, a motor for driving a tape, a vibration of a transmission system thereof, The vibration of the rotating head cylinder with a rotating head, etc., and the vibration caused by repeating the contact and detachment of the rotating head and tape, etc.) are transmitted to the microphone 102 via the main body member, and the sound of the target object to be collected is The information was recorded on the VTR, and the original information was distorted due to these unnecessary noises and vibrations, or some of the information was lost. Conventionally, when the microphone 102 is joined to the main body 100 in order to prevent the recording of these noises and vibrations, transmission of the vibrations is prevented by using an elastic body such as rubber as the joining member, for example. We are going, but the effect is small. As a second method, there is a method of installing the microphone 102 as far away from the main body 100 as possible. However, this is contrary to integrating the entire device into a small and lightweight one, and there is a limit in the configuration. As a third method, the microphone 102
Is to provide a sharp directivity to the gain, but providing a highly selective directivity may be inconvenient for the user's intention to collect sound information, and there are also structural limitations. A fourth method is to cut the electric signal obtained from the microphone 102 in a wide band in the audible frequency range by using a filter constituted by an LCR or the like,
It is a method that combines with lowering the gain from 102,
By this, for example, the overall frequency characteristic is set to 150 Hz to 4 KHz, and a certain effect can be obtained, but it is far from so-called faithful sound recording, and the more the user tries to reduce noise and noise, the more the user will The quality of the information you want to collect
There is a contradiction that both quantities decrease.

In view of the above problems, the present invention analyzes a vibration generated from a main body part based on information of sound from a microphone for a predetermined time, estimates, extracts, and extracts a frequency spectrum for receiving and canceling the frequency spectrum. , RAM, etc., and then extract this information to oscillate the characteristics of a digital filter, for example, as a frequency spectrum characteristic to cancel out this, and maintain the quality of the necessary sound information without compromising the quality of the required sound information. Is provided.

Means for Solving the Problems In order to solve the above problems, a recording / reproducing apparatus of the present invention converts an optical image from a subject into a video signal and inputs the same, and converts sound into an audio signal and inputs the same. Audio signal input means, and extraction means for extracting a predetermined audio signal from the audio signal input by the audio signal input means,
Frequency characteristic generating means for generating a frequency characteristic for attenuating the predetermined audio signal from the predetermined audio signal extracted by the extracting means; and a filter for generating a frequency characteristic generated by the frequency characteristic generating means. Filter control means for controlling the means, filter means controlled by the filter control means, the audio signal input by the audio signal input means is input to the filter means, the audio signal output from the filter means And a first recording means for recording a video signal generated by the imaging means.

Operation According to the present invention, it is possible to collect and reproduce high-quality information with little noise according to the user's intention.

Embodiment Hereinafter, a recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a first embodiment of the present invention. 1 is
It is a main body that houses a VTR mechanism and an electric circuit unit (both not shown). Reference numeral 2 denotes a microphone unit for collecting sound. Reference numeral 3 denotes a video camera unit in which an optical lens and a CCD (not shown) are combined.

FIG. 2 is an external view of the first embodiment of the present invention, wherein 4 is a video cassette containing a magnetic tape as recording means, and 5 is a place where the cassette storage section is open. It is designed to be stored by hand like.

FIG. 3 is a block diagram of a sound processing system circuit related to processing and recording of sound information.

11 is a microphone 12 and a preamplifier circuit, 13 is an FFT (Fast Fourier Transform) circuit having a built-in CPU and a sampling circuit, and 14 is a RAM for recording an output from the FFT circuit.
It is. Reference numeral 15 denotes an arithmetic circuit that has a built-in CPU and the like and, for example, software that has an averaging algorithm and the like.

Reference numeral 16 denotes a digital configuration filter, which is activated with a certain characteristic by the operation circuit of 15. 17 is a recording circuit. Reference numeral 18 denotes a magnetic recording head using, for example, a ring coil.

The operation of the recording / reproducing apparatus configured as described above will be described below with reference to FIGS. 1, 2, 3, and 4 to 7.

First, in FIG. 1 and FIG.
The image and sound information collected by the microphones is recorded in four video cassettes in one main body.
The main body of 1, the microphone of 2, the video camera of 3 and the video camera section are integrally formed as shown in the figure.
The appearance and configuration as R are shown.

FIG. 3 shows an audio signal processing circuit. The weak audio signal picked up by the 11 microphone is amplified by the 12 preamplifier circuit. This audio signal is input to an FFT (Fast Fourier Transform) circuit including 13 sampling paths and a CPU. The audio signal processed in the 13FFT circuit is recorded in 14 RAMs in the form of a frequency spectrum. 4th
Figures to 7 are examples. This is a frequency spectrum recorded in 14RAM through the audio signal processing system of FIG. 3 in which the camera-integrated VTR of this embodiment is installed in an anechoic room.

FIGS. 4 and 5 show a recording state when the tape is not running, that is, in a state where the tape is not added (using a cassette or the like in which a magnetic tape is not stored). , FIG. 7 shows a state in which the tape is actually in a running state. In Fig. 4, 2Hz
~ 1KHz range, but the rotation speed of the rotating head cylinder
It can be seen that large peaks are generated at fundamental frequencies of 30 Hz, 60 Hz, 180 Hz, 360 Hz and the like at 1800 rpm, and that vibrations related to the tape drive of the power supply ripple system and the capstan exist around 15 Hz to 30 Hz. 12Hz to 5KHz in Fig. 5
In the range, 2160 Hz and 4320 Hz have large peaks, and it is considered that these components are 72 times and 144 times higher harmonic components of 30 Hz of these fundamental components, respectively.

6 and 7, in addition to the vibrations described above, the contact and detachment of the tape and the rotary head are performed at a high speed (a phenomenon called so-called head tack), in addition to FIGS. 4 and 5. A component related to tape vibration is added. Each of these examples shows the vibration generated by the camera-integrated VTR itself, and the hatched part in FIG. 4 is at a level that can be ignored compared to the actual sound information to be collected. It is shown.

The operation will be described again with reference to FIG. In the RAM 14, a mixture of the vibration generated by the device itself and sound information from the outside is recorded in the form of a frequency spectrum. The arithmetic circuit of 15 extracts only the spectrum components generated by the device itself, for example, by software having an averaging algorithm from these signals, and calculates and determines the frequency spectrum that cancels them out. You can send this information to

The above-mentioned steps, for example, when producing this equipment at a factory, individually measure or derive the vibration component generated by this equipment itself, and incorporate it into this equipment as a ROM defining the characteristics of the digital component filter 16. This device may be shipped, or the user of this device may optionally set the characteristics of the 16 digital component filters at any time according to the surrounding circumstances to selectively select the sound information to be collected. Can also be collected.

In this way, a signal input from the microphone 11 by operating a digital filter (for example, composed of a plurality of LSIs) having a characteristic of a frequency spectrum that cancels a unique frequency spectrum generated by the device itself. Is input to a recording circuit 17 via a preamplifier circuit 12 and a digital configuration filter 16, and is recorded on a recording medium such as a magnetic tape via a recording head 18. The information recorded in this way is excellent in quality without vibration components generated by the device itself.

In the first embodiment, a VTR using a magnetic tape was used.
Although such a case is taken as an example, this is applicable regardless of a disk-shaped recording medium, magnetic recording or optical recording. It is also applicable to what is called digital solid-state recording in RAM or the like, and can have a practical effect in terms of selective collection of information. Further, the present invention is also effective in improving sound quality when collecting sound information in a factory where much periodic noise is present.

Effects of the Invention As described above, according to the present invention, in a device in which a video camera and a magnetic recording / reproducing means such as a VTR are integrally configured,
It takes in external sound information for a certain period of time (for example, several seconds) from a microphone or the like, analyzes it with software having an algorithm such as averaging, estimates the inherent vibration component of the device, and goes through the process of extracting it. A frequency spectrum for canceling this is extracted, and this is recorded on a recording medium in a RAM or the like, and then this information is extracted.For example, the characteristics of a digital filter are set to characteristics that cancel the vibration components inherent to the device. This makes it possible to construct a small and lightweight device without deteriorating the quality of required sound information. Further according to the invention,
A large effect can be obtained with a small electronic component such as an LSI, and a practical effect is very large from the viewpoint of reduction in size and weight.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a perspective view of the same embodiment, FIG. 3 is a block diagram of an audio signal processing of one embodiment of the present invention, and FIGS. FIG. 8 and FIG. 9 are actual perspective views of a camera-integrated VTR. 1 ... body part, 2 ... microphone, 3 ... video camera part, 14 ... RAM, 15 ... arithmetic circuit, 16 ... digital configuration filter.

Claims (2)

(57) [Claims] 1. An image pickup means for converting an optical image from a subject into a video signal and inputting the image signal, an audio signal input means for converting and inputting a sound into an audio signal, and an audio signal inputting means for inputting the audio signal Extracting means for extracting a predetermined audio signal from the inside; frequency characteristic generating means for generating a frequency characteristic for attenuating the predetermined audio signal from the predetermined audio signal extracted by the extracting means; Filter control means for controlling the filter means so as to have a frequency characteristic generated by the means, filter means controlled by the filter control means, and the filter means for filtering the audio signal input by the audio signal input means. And an audio signal output from the filter means and a video signal generated by the imaging means. Recording and reproducing apparatus characterized in that it comprises a first recording means and the. 2. The recording / reproducing apparatus according to claim 1, further comprising a second recording means for recording the frequency characteristic generated by the frequency characteristic generating means.