JPH04192900A - Howling preventing method - Google Patents

Abstract

PURPOSE:To prevent the production of howling by recording sound collected by a microphone onto a recording body once and reproducing the recorded sound momentarily. CONSTITUTION:A howling preventing device A consists basically of a microphone 1, a recording and reproducing means (b), an amplifier 2 and a speaker 3. The recording and reproducing means (b) records once sound collected by the microphone 1 onto a recording body 5 and reproduces the recorded sound momentarily to interrupt the sound circulating from the microphone 1 to the speaker 3 and from the speaker 3 to the microphone 1 on the way. Thus, the production of howling is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a howling prevention method used in loudspeaker audio equipment and the like.

(Prior Art) Conventionally, when using audio equipment for amplification indoors and outdoors, for example, as shown in FIG. 2, a microphone 10 for inputting sound and an amplifier 1 for amplifying the input sound are used.
1 and a speaker 12 that converts the amplified audio signal into air vibrations and generates audio.

When the desired sound amplification is performed using the above-mentioned device, if the microphone 10 is not used and one with wide-angle directivity is used, the speaker 12 is used as shown by the dotted line in FIG.
The amplified sound emitted from the microphone 10 is picked up again by the microphone 10 and circulated within the above-mentioned equipment, causing so-called howling, which is an unpleasant resonance noise.

(Problems to be Solved by the Invention) The present invention allows the sound collected by the microphone to be recorded on a recording object, and instantaneously plays back the recorded sound, thereby transmitting the sound from the microphone to the speaker, and
It is an object of the present invention to provide a method for preventing the occurrence of howling caused by the above-described method by interrupting sound circulating from a speaker to a microphone midway.

(Means for Solving the Problems) The method of the present invention for achieving the above-mentioned object is as follows: (1) Recording audio signals collected and input from a microphone to (2) a recording object that circulates through a recording member; (1) Immediately causing the audio signal of the recorded object to be reproduced by a reproducing member placed close to the recording member and outputting the audio signal of the recorded object from the speaker via the reproducing amplifier; (2) After playing back the audio of the recording object; , the howling prevention method uses an erasing member to muffle the sound in preparation for the next recording.

(Function) The howling prevention method of the present invention configured as described above exhibits the following effects.

The sound collected by the microphone is recorded by a recording member onto a recording medium that circulates at a constant speed.

This recorded audio signal is played back by an adjacent playback member as the recording object travels, and this playback signal is amplified through a playback amplifier and sent to a speaker, where it is converted into air vibrations. The object is pronounced and the desired amplification is performed.

At this time, since the recording member and the reproducing member are arranged side by side in extremely close proximity to the object to be recorded, there is almost no audible time difference between the amplified sound and the original sound, and there is no sense of discomfort.

Therefore, as mentioned above, the flow of sound is interrupted midway from the microphone to the speaker, and the recording signal of the recorded object recorded by the recording member is between the reproducing member and the recording member during this circulation. Since it is erased by the provided erasing member, it becomes possible to record a new audio signal.

(Embodiment) Next, an embodiment of the howling prevention method according to the present invention will be described based on the drawings.

In FIG. 1, A is a howling prevention device employing the method of the present invention, which includes a microphone 1, recording/reproducing means,
It basically consists of an amplifier 2 and a speaker 3.

The microphone 1 may be of any commonly used type, and collects human voices and sounds.

The recording/playback means described above temporarily records the voice collected by the microphone 1, immediately plays back this recorded signal, and transmits it to the speaker 3, and uses a known tape recorder, CD player, etc. capable of recording and playback. A recording member 5 that circulates in one direction by a drive member (not shown) within the frame 4, and a recording member that applies an electromagnetic signal to the recording member 5. 6 and
a reproducing member 7 for reproducing the electromagnetic signal disposed adjacent to the recording member 6; and an erasing member 8 disposed midway between the reproducing member 7 and the recording member 6 in the traveling direction of the recording object 5. Consisted of.

The recording medium 5 is a tape recorder, which uses a cassette tape made of endlessly formed magnetic tape capable of analog or digital recording and playback, and a CD player. Compact discs, which can be recorded and played repeatedly, are used.

The recording member 6 amplifies the sound collected by the microphone 1 to a predetermined value using a recording amplifier 9 and inputs the amplified sound to the recording object 5. It uses a magnetic head that contacts the magnetic tape with a predetermined gap, and when using a CD player, digital recording is performed using an optical element such as a laser.

The above-mentioned reproducing member 7 picks up the recording signal input to the recording target 5 by the recording member 6, and when a tape recorder is used as the recording/reproducing means, it contacts the magnetic tape with a predetermined gap. It uses a playback head, and when using a CD player,
Digital reproduction is performed using optical elements such as lasers.

The above-mentioned erasing member 8 is for erasing the previous recording signal inputted to the recording target 5 by the recording member 6 in order to record a new audio signal, and the recording/reproducing means uses a tape recorder. When a CD player is used, erasing is performed using an optical element such as a laser.

In FIG. 1, reference numeral 9 denotes a reproducing amplifier, which is connected to the reproducing member 7, receives the reproduced signal, and amplifies it into a large energy change, and a conventional amplifier is employed.

The above-mentioned speaker 3 receives the electrical signal energy reproduced by the reproduction member 7 and from the amplifier 9 and converts it into air vibration, and various commonly used speakers are selectively used.

Next, the operation of the embodiment of the present invention when the tape recorder b is used as a B sound/reproducing means will be explained with reference to FIG.

First, the sound collected by the microphone 1 is recorded by the recording head 6 via the recording amplifier 9 onto the magnetic tape 5 which circulates endlessly at a constant speed of, for example, 4 mm/s in the tape recorder b.

This recorded audio signal is transmitted by the running of the magnetic tape 5.
Immediately (about 01 seconds later) this reproduction signal is reproduced to the reproduction head 7 adjacent to the recording head 6.
The sound is amplified into large electrical energy through the reproducing amplifier 2 and transmitted to the speaker 3, where it is converted into air vibrations, which are then emitted and amplified as desired.

The above-mentioned recording and playback heads 6.7 are installed in such a way that the time required from audio recording to playback is minimized by placing them very close to each other, so that the viewer does not feel any discomfort due to the time difference. Since these are composed of magnetic heads, their magnetism acts on other adjacent heads and adversely affects recording or playback conditions.
It is preferable to correct the output time difference that occurs as described above by increasing the running speed of the magnetic tape 5, or to take magnetic shielding measures for each of the heads 6 and 7 described above.

As mentioned above, since the flow of sound is interrupted from the microphone 9 to the speaker 3 via the magnetic tape 5, there is no occurrence of unpleasant howling, and
Since the recording signal recorded on the magnetic tape 5 by the recording head 6 is erased by the erasing head 8 provided in front of the recording head 6, new audio signals can be continuously recorded.

(Effects of the Invention) The present invention configured as described above first records the sound collected by the microphone on a recording object, and instantaneously reproduces the recorded sound, thereby transmitting the sound from the microphone to the speaker. , and the sound circulating from the speaker to the microphone is interrupted in the middle, thereby preventing the occurrence of howling caused by the above.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing a device adopted in the howling prevention method according to the present invention. FIG. 2 is an explanatory diagram schematically showing a conventional sound amplification device. In the figure, 1 is a microphone, 5 is a recording object, 6 is a recording member, 7 is a playback member, 2 is an amplifier, 3 is a speaker, 8
is an erasing member.

Claims (1)

[Claims] The audio signal collected and inputted from the microphone is recorded by a recording member on a circulating recording object, and immediately reproduced by a reproducing member placed close to the recording member, and then reproduced from the speaker via the reproducing amplifier. 1. A method for preventing howling, comprising outputting an audio signal from a recording target, and muffling the sound with an erasing member after reproducing the signal from the recording target to prepare for the next recording.