JP2008264681A - Pleasant sound shredder - Google Patents

Abstract

【Task】
An unpleasant noise generated when using the shredder is reduced to provide a more comfortable use environment.
[Solution]
After blocking the noise generated from the shredder drive unit, the noise source is captured by a microphone and converted to sound, so that the noise generated from the shredder is converted into a natural pleasant sound and a comfortable feeling of use can be obtained. Provide a shredder. Furthermore, by selecting a sound to be uttered according to the user's preference or mounting a 1 / f circuit, a natural sound can be emitted and a more comfortable use environment can be provided.
[Selection] Figure 1

Description

  The present invention relates to solving unpleasant noise, which is a drawback of a shredder, by converting noise generated when an electric shredder is used into comfortable speech.

  In order to protect personal information and confidential matters, shredders are mainly used in offices where office work is performed, and are used in many companies. However, many of the commercial electric shredders used in offices generate noise during operation due to the structure of their constituent parts and do not have a positive effect on the work environment.

  As described above, in office equipment having a noise source therein, how to reduce these noises is an important problem, and means for solving these problems is required.

  Conventionally, passive technology using sound-absorbing and sound-insulating materials has been the main technology for reducing noise generated by equipment, but active noise that intentionally generates reverse-phase sound and reduces it by interference. Bass technology has become possible due to the recent development of signal processing technology.

  For example, in a refrigerator, an automobile, etc., a sound having an opposite phase is generated by a speaker or the like, and is silenced by interference.

  Further, as a silencer for the shredder, means for reducing noise leaking to the outside from the paper inlet by disposing a roller formed of a sound absorbing member in a state of closing the paper passage between the paper inlet and the cutter mechanism. Is described in Patent Document 1.

  The f / 1 fluctuation of claim 2 is a principle studied by Toshimitsu Takeshi and others, emeritus professor of Tokyo Institute of Technology, and is characterized by having regularity but not regularity. This is a phenomenon that is universally seen in the natural world, and is the law that is the basis of the movement of all natural phenomena. For example, people are generally relaxed and comfortable, such as breeze, sea ripples, river buzz, and flame fluctuations. It is known that it is a pattern to feel.

A method of effectively controlling the degree of relaxation of a person's physiological or psychological tension by giving fluctuation noise to the sound space using such fluctuation theory has been devised. This sound environment control method is detailed in Patent Document 2.
JP-A-9-234382 JP-A-2-134164

  For office equipment that generates noise from the main body due to its mechanism, such as a shredder, a technology has been devised to block, absorb, and mute the generated noise, but convert the noise to a more comfortable sound for playback. There is no mention of how to make the office environment more comfortable by doing so.

  In addition, soundproofing materials and sound-absorbing materials have the effect of reducing the generated noise, but it is impossible to completely cancel this, and the negative effects that this non-cancellable noise has on the office environment are reduced. Things become a challenge.

  As means for solving the above problems, it is necessary to suppress noise generated from a motor for cutting the paper and a mechanism for cutting paper from the shredder body.

  However, it is necessary not to absorb the generated noise but to prevent the noise generated from the main body from leaking to the outside by surrounding the mechanism part which is a noise source with a sound insulating material, for example. As this means, a sound insulation wall is provided to block the sound of the motor and the cutting mechanism, and the noise emitted from the noise source is prevented from leaking outside.

  However, since it is impossible to completely block the sound leaking from the gap even with this sound insulation wall, this leaked sound is canceled by making another comfortable voice.

  As a means for generating a comfortable sound, there is a microphone for collecting a sound source that performs sound modulation inside the sound barrier, and the sound collected by the microphone is converted by a sound conversion device provided inside the shredder. By converting the sound, the unpleasant sound is converted into a comfortable sound.

  In the sound modulation device, after the sound collected by the microphone is converted into a digital signal, an unpleasant frequency is removed or a frequency pattern or waveform is corrected by digitally calculating the sound source waveform.

  In addition, from the memory that records several waveform patterns of sound sources in the natural world, such as the sound of rivers and waterfalls, the noise of the trees in the forest, and the ripples of the sea, the characteristic frequency and waveform patterns are extracted and collected. By performing digital processing based on this data, a pleasant sound similar to the characteristics of natural sounds is obtained.

  In addition, the shredder has a 1 / f fluctuation generation circuit to bring the converted voice closer to the natural sound. By adding 1 / f fluctuation to the modulated sound, the natural sound is further reduced. Comfortable speech with features is generated.

  The voice synthesized with the 1 / f fluctuation is controlled by an internal amplifying device and a volume control device, and a comfortable natural voice modulated so as to cancel noise leaked from the shredder is emitted from a built-in speaker.

  The shredder further has an operation panel as in claim 3. This operation panel allows users to select the natural sounds of the user's taste, such as the sound of a forest noise, the sound of a waterfall, the ripples of the coast, and this shredder can perform sound conversion according to that preference And

  The work environment can be improved by preventing noise generated mainly from shredders used in offices and generating comfortable natural sounds. In addition, noise that cannot be suppressed even by the soundproofing device or the soundproofing device can be eliminated and canceled.

  FIG. 1 shows a configuration diagram of the sound shredder.

  First, it is necessary to reduce the direct sound of the noise source by shielding the motor and the cutting mechanism, which is the shredder structure, with the sound insulation wall (D). This noise source is the motor (a) and the cutting cutter (b) that make up the shredder, and the mechanism (C) that drives it. The noise generated by these elements prevents the pleasant sound effect of the shredder from being canceled. It is.

  Inside the sound insulation wall, there is a microphone (e) for collecting a sound source. The microphone (e) has a role of capturing noise emitted from the mechanism unit and inputting it as a sound source to the sound conversion circuit (f).

  The voice conversion circuit is connected to the shredder operation panel (g), and the voice conversion circuit (f) performs voice conversion according to the preference by the user selecting a desired voice pattern through the operation panel. Shall be able to.

  The sound pattern thus generated by the sound conversion circuit (f) is converted into a pleasant sound based on the unpleasant sound generated by the shredder and is generated by the speaker (10).

  Thus, the voice conversion circuit for converting noise into pleasant sound is realized by a voice conversion process as shown in FIG.

  The sound waveform (1) captured by the microphone for collecting sound is digitized by the analog / digital conversion circuit of (2), and the sound properties are changed by calculating the waveform with the digital arithmetic unit shown in (3). It is.

  In this digital arithmetic unit (3), the sound characteristics are changed by calculating digitized audio data with an internal microprocessor. For example, this circuit has a filter circuit (4) that cuts off an unpleasant frequency generated from noise and an arithmetic circuit (5) that modulates a speech waveform.

The voice digitally converted by the conversion circuit (2) removes only an unpleasant voice component by cutting an unnecessary voice frequency range by the filter arithmetic device (4).

The digital arithmetic device (5) is an arithmetic circuit that can synthesize, compare, and extract digital audio signals by an internal processor.

In this arithmetic circuit, the waveform pattern selected by the user on the operation panel (6) is read from the waveform patterns stored in the memory (7) in which some characteristics of natural sounds are preset, and compared and calculated. By doing so, the inputted voice is converted into the characteristics of the natural sound held in the memory (7).

Furthermore, in order to give a further natural feeling to the voice, a 1 / f fluctuation generation circuit represented by (8) is provided, and a comfortable voice synthesized with a natural fluctuation waveform generated from this circuit can be synthesized.

The block diagram of a pleasant sound shredder. Audio conversion process of audio modulator.

Explanation of symbols

a Shredder drive motor b
Cutting roller C Shredder drive mechanism D Sound insulation shield plate e Sound collection microphone f Audio conversion circuit g Operation panel h
Speaker 1
Analog noise 2
Analog to digital converter 3
Digital arithmetic unit 4 Filter circuit 5 Arithmetic circuit 6 Operation panel 7 Voice pattern holding memory
8 1 / f fluctuation generation circuit 9 amplifier 10 pleasant sound

Claims (5)

  As a shredder, it has a blade for cutting paper and its mechanism, a driving motor, a soundproof wall to prevent noise, a microphone for collecting sound generated from the shredder body, and collected sound A device for digitally converting and modulating sound, an amplifying device for amplifying the sound and adjusting the volume, and a speaker for generating the converted sound.   A memory holding characteristics of natural sounds to be referred to when modulating the sound of claim 1 into a comfortable sound, and a shredder capable of performing sound conversion based on data in the memory.   The apparatus according to claim 2, further comprising an operation panel for a user to select a favorite natural sound.   A shredder capable of performing voice conversion based on data in a memory that holds characteristics of a natural sound that is referred to when modulating the sound of claim 1 into a comfortable sound. A shredder provided with 1 / f fluctuation generation circuit in addition to claim 1 and capable of emitting voice obtained by adding fluctuations of the natural world to collected voice.

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