JPS62120196A - Video camera - Google Patents

Abstract

PURPOSE:To change a directional characteristic optionally as the entire of a microphone by mixing the output signal of the microphone of a non-directional characteristic and the output signal of the microphone of a superdirectional characteristics in an optional rate set by a manipulator. CONSTITUTION:A mixing circuit 13 mixes the size of the output signals of the microphone 11 of a non-directional characteristic and the microphone 12 of the superdirectional characteristic in the optional rate. When the movable terminal of a semi-fixed resistor 15 is set to a side by the manipulator 14, a lot of voice components recorded in the microphone 11 are included in the output signal from the circuit 13. On the other hand, when the movable terminal is set to a (b) side by the manipulator 14, in the output signal from the circuit 13, a lot of the sound components recorded in the microphone 12 are included. Thereby, the directional characteristic as the entire of the microphone can be changed optionally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video camera with a built-in microphone.

Background of the Invention In recent years, video camera technology has progressed rapidly, such as simplification of operation with an autofocus function and miniaturization of devices with the use of solid-state image sensors. The technology related to 1. i! There is no period.

Hereinafter, an example of the conventional video camera described above will be explained with reference to the meat side.

FIG. 4 is a block diagram of the microphone head and audio circuit of a conventional video camera. In FIG. 4, 41 is the microphone 0 phone. 42 is an audio circuit, which is connected to the microphone 41.

The operation of the conventional video camera configured as described above will be described below.8 First, an audio signal is converted into an electrical signal by the microphone 41. The electrical signal is then processed in the audio circuit 42.

Problems to be Solved by the Invention However, the above configuration has a problem in that the output of only one microphone can be obtained, so that the directional characteristics remain fixed at a certain level.

In view of the above-mentioned problems, the present invention provides a video camera in which the directional characteristics of an equipped microphone are changed by moving an equipped operating knob.

Means for Solving the Problems In order to solve the above problems, the video camera of the present invention includes an omnidirectional microphone, a superdirectional microphone, and an arbitrary size of the output signal of these two types of microphones. It is equipped with a circuit that mixes at a ratio of , and an operating knob that can set the mixing ratio.

Effect of the present invention With the above-described configuration, the output signal of the omnidirectional microphone and the output signal of the superdirectional microphone are mixed at an arbitrary ratio set by the operation knob, and thereby The directional characteristics of the microphone as a whole can be changed arbitrarily.

Embodiments Hereinafter, video cameras according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the principle of a microphotometer whose directivity characteristics can be changed according to a first embodiment of the present invention.

In Figure 1, 10 and 11 are outside the video camera 11I]j
(t(.

12 is a superdirectional microphone installed outside the video camera in line with microphone 11; 13 is a mixing circuit installed inside the video camera; 14 is outside the video camera. This is the operating knob provided.

The operation of the video camera of this embodiment configured as described above will be described below with reference to FIGS. 1 and 2.

First of all, FIG. 2 shows a circuit configuration for realizing the mixing circuit and operation section of FIG. 1, in which 15 is a semi-fixed resistor, 16
is an operational amplifier, and these two correspond to the mixing circuit in FIG. Further, 17 is a movable terminal of the semi-fixed resistor 15,
This corresponds to the operating knob 14 in FIG.

In FIG. 2, when the movable terminal of the semi-fixed resistor 15 is set to the d side, the output signal from the mixing circuit 13 contains many audio components picked up by the omnidirectional microphone 11,
Conversely, if the movable terminal of the half-peripheral constant resistor 15 is set to the b side,
The output signal from the mixing circuit 13 contains many audio components picked up by the superdirectional microphone 12.

As described above, according to this embodiment, by providing an omnidirectional microphone, a superdirectional microphone, a mixing circuit for mixing their outputs, and a knob for setting the mixing ratio, By moving the control knob, you can set the microphone's directional characteristics as desired.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a principle diagram of a variable directional characteristic microphone that is linked to lens zoom according to a second embodiment of the present invention.

In Figure 3, 11 is an omnidirectional microphone, 12
is a super-directional microphone, and the above configuration is the same as that shown in FIG. The difference from the configuration shown in FIG. 1 is that the semi-fixed resistor 21 and operating lever 22 are
This is a point that was provided to also serve as 3.

The operation of the video camera of this embodiment configured as described above will be explained below.

When the lens zoom ring 23 is turned in the direction of arrow a, the movable terminal of the semi-fixed resistor 21 also moves in the direction of d. Reverse /
When the zoom ring 23 is turned in the direction b, the movable terminal of the semi-fixed resistor 21 also moves in the direction indicated by the arrow.

When the lens zoom ring 23 is turned in the direction of arrow a, the lens becomes wide-angle, and the ratio of microphone signal mixing is higher than that of the omnidirectional microphone 11 than that of the superdirectional microphone 12. becomes larger than the signal of Conversely, if you turn the lens zoom ring 23 in the direction indicated by the arrow, the lens becomes telephoto, and at the same time, the mixing ratio of the microphone signals increases, or the signal from the super-directional microphone 12 is higher than that from the non-directional microphone 11. Signals will also get louder.

As described above, by providing a semi-fixed resistor and an operating knob that also serves as a lens zoom ring, the directional characteristics of the microphone can be changed depending on both corners.

Effects of the Invention As described above, the present invention provides an excellent effect in that the directional characteristics of the microphone can be changed by moving the operating knob.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a video camera according to a first embodiment of the present invention, FIG. 2 is a circuit configuration diagram realizing the mixing circuit and operation section of FIG. 1, and FIG. FIG. 4 is a schematic diagram of a conventional video camera. 11゛・ Omnidirectional microphone, 12...
Super directional microphone, 13... mixed circuit,
14゜22...Operation knob, 16.21...Semi-fixed resistor, 16. Operational amplifier, 23...Lens zoom ring.

Claims (1)

[Claims] a first omnidirectional microphone; a second superdirectional microphone; a mixing circuit that mixes an output signal of the first microphone and an output signal of the second microphone; A video camera characterized in that it is equipped with an operation knob that can set the ratio of the video camera.