JPH0634174B2 - Cosmic sound generation method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a method for converting space radio waves into sound and a device for generating sound corresponding to space radio waves.

(2) Background of the invention Since ancient times, human beings have been aware that there are celestial bodies in the universe by visually grasping the light coming from the universe. However, although light can be seen directly, the message from the universe is not only due to light (including ultraviolet rays, infrared rays, etc.).
Electromagnetic waves called millimeter waves are generated by various interstellar substances and sent to the Earth at wavelengths peculiar to the substances. Due to the remarkable development of electronics in recent years, this millimeter wave has been actively observed and researched. The data obtained as a result of such observational research include, for example, the data shown in FIG. This is the Orion Nebula (ORI-A)
Is an example of an observation data radio wave diagram of an interstellar molecular spectral line in the 89.5 GHz (gigahertz) band, which is created by observing a radio wave with a radio telescope having a diameter of 45 meters and analyzing it with an acousto-optic radio wave spectroscope. As is clear from this radio wave diagram, the frequency band of the spectrum line is an extremely high frequency of gigahertz, which is invisible or inaudible. But,
Even in such an ultra-high frequency band, a message from a star is included, and by analyzing the characteristics of the radio wave diagram, it is possible to know what component the star is composed of and the like.

The present invention reproduces an interstellar radio wave that cannot be sensed by the human five senses in a state in which it is scaled down to the audible band based on its radiogram, and performs acoustic conversion of this to reproduce the sound from space. The purpose is to realize the expansion and improvement of AV (audio / visual / visual) culture by making it possible to set the situation as if a message was received.

(3) Configuration of the Invention In order to achieve the above object, a first aspect of the present invention provides a signal waveform, which is a cosmic radio wave in a predetermined frequency range measured in advance and is displayed at a frequency of a uniform scale, of an audible frequency in a predetermined frequency range. When converting to a signal waveform, the audible center frequency of the audible frequency is calculated by a predetermined calculation from the lower limit and the upper limit frequency of the audible frequency, and the radio wave center frequency of the space radio wave is scaled down to the audible center frequency. It is characterized in that the signal waveform of the space radio wave is converted into a signal waveform of an audible frequency on a logarithmic scale with reference to the audible center frequency.

A second aspect of the present invention is a cosmic radio wave in a measured predetermined frequency range, in which a signal waveform displayed at a frequency of a uniform scale including a plurality of peak signal components of a wide band, a medium band and a narrow band is displayed. , An apparatus for converting a signal waveform of an audio frequency, an oscillator for generating a monotone signal of a specific and variable single frequency within the frequency range of the audio frequency, and a pink noise signal over the frequency range of the audio frequency A pink noise oscillator for generating, a plurality of filters for extracting a signal having a predetermined bandwidth from the pink noise signal and transmitting a peak noise signal having a wide bandwidth or a medium bandwidth, the monotone signal, the pink noise signal and An audio adjuster for adjusting the levels of the peak noise signals, combining the levels, and sending the converted output signal is provided.

(4) Description of Example As shown in the above explanation, FIG.
89.5 GHz, which was created by observing with a 5 m diameter radio telescope (more specifically, a 45 m radio telescope installed at the Nobeyama Space Observatory) and analyzing it with an acousto-optic radio spectrum base.
Is an observation data radio wave diagram of the interstellar molecular spectrum line from 1 to 91.5 GHz. As is clear from this radio wave diagram, within the bandwidth, the 89.505 GHz band representing methyl alcohol (CH ₃ OH) is 1.43 AT (K) (antenna / temperature, but noise level is 0),
89.565 representing the cyanide ethyl _{(C 2} H 5 CN)
The components of the radio waves generated by the interstellar molecules as shown in Table 1 below are analyzed such that the GHz band is 0.7 AT (K) and the 90.66 GHz band representing hydrogen cyanide is 3.2 AT (K) or more. be able to.

The intensity distribution of the space radio wave represented by the observation data radio wave chart shown in FIG. 1 or the observation data analysis table also shows
It can be represented by a spectrum line as shown in the figure. This is 2 from 89.5GHz to 91.5GHz mentioned above.
The frequency band of GHz is evenly divided into equal graduations.
The interstellar molecular lines in the figure are arranged according to frequency.

Such ultra-high frequency radio waves are scaled down to perform frequency conversion into the audible frequency band. In scaling down the frequency of the spectral line shown in FIG. 3 to the audible frequency band, first, the center frequency is determined. Therefore, if the low-frequency limit of the audible frequency band is xHz, the high-frequency limit is yHz, and the center frequency (audible center frequency) of the audio signal is AHz, The relationship is established.

In the radio wave charts shown in Fig. 1 and Fig. 3, the frequency band of the spectrum line is 2 from 89.5 GHz to 91.5 GHz.
GHz, and its center frequency is 90.5 GHz.
On the other hand, in determining the audible frequency band, when the human hearing is used as a reference, generally, the lower limit can be set to x = 20 Hz and the higher limit can be set to y = 20,000 Hz. Thus, when the center frequency A in the audio frequency band is obtained from the first equation, Therefore, it is generally called the law of 400,000, and it is assumed that the center frequency does not change even if x and y are changed (see FIG. 5). That is, 90.5 GHz of the above spectrum line corresponds to 632 Hz at the audible frequency. However, the center point may be slightly moved for the purpose of practical hearing correction.

Next, frequency conversion for scale down is performed by the following equation.

N: Scaled down audible frequency (Hz) n: Frequency of spectrum line to be scaled down (Hz) C: Minimum frequency of spectrum line band to be scaled down (Hz) D: Scaled down Maximum frequency (Hz) in the band of the spectrum line x: Low limit frequency (Hz) of audio frequency band y: High frequency limit (Hz) of audio frequency band

The audible frequencies obtained by this theory are shown in the waveform diagram of FIG. In this figure, the horizontal axis is 20Hz
Is the low frequency limit frequency and 20 KHz is the high frequency limit frequency, and the vertical axis represents the sound pressure level (dB) corresponding to the intensity of space radio waves in each frequency band shown in Fig. 1 or 2. ) Is attached.

From the above, the waveform of space radio waves was scaled down to the frequency band between 20Hz and 20KHz.

However, there are individual differences in the audible frequency band, and for example, the above-mentioned super-high frequency cosmic radio waves are 30
In some cases, it is desired to lower the level from Hz to the audible frequency band of 13.3 KHz. In such a case, the correction can be made using the scale table shown in FIGS. FIG. 4 shows that the 2 GHz band created based on Table 1 is equally divided, and the change amount of the equally divided scale according to the fluctuation (variable amount) of the low frequency band and wide range limit frequency x and y of the audio frequency band. It is a scale figure to figure out. Further, FIG. 5 is a scale diagram showing an audio frequency band width in which the low frequency band and the center frequency of the audio frequency band are set to 632 Hz based on the above-mentioned first expression. In this figure, the part enclosed by the triangle of the solid line P shows the range of the law of 400,000 for varying the audible frequency band. Also, the portion surrounded by the dotted line Q is the one in which the center point has been moved for auditory sense correction. Combine these two scale diagrams,
If it is slid vertically, it is possible to easily determine the cosmic radio frequency and the corresponding audible frequency for a predetermined audible frequency band in which x and y are changed. For details of how to use, that is, determine x and y to be obtained on the diagonal line of the triangle of the solid line P in FIG. 5, and draw a horizontal line parallel to the base. Next, overlap FIG. 4 with the bottom of FIG. 5, align the center lines, slide vertically while keeping the horizontal parallel, and the diagonal lines on both ends of FIG. If the figure is fixed at the point intersecting with the y point, the frequency in FIG. 4 below the horizontal line at that time matches the frequency on the horizontal line in FIG. When the audibility correction is necessary, the center line can be moved within the range from the solid line P to the dotted line Q of the triangle in FIG.

FIG. 6 is a diagram showing a circuit configuration of an apparatus for generating cosmic sound based on a scaled down waveform diagram. However, in this device, the acoustic adjuster described later is an acoustic adjusting means such as a recording adjusting console (mixer console) generally configured in a recording studio, which is composed of a large number of switches, and its internal circuit should be described. Since it is extremely difficult, it is limited to a conceptual description in FIG.
This cosmic sound synthesizer is a low frequency oscillator for generating a voice signal corresponding to a waveform having a narrow bandwidth of the bandwidth waveform shown in Table 1, that is, a monotone signal having a single frequency.
And a pink noise oscillator 2 that generates a voice noise signal corresponding to cosmic noise, and a peak noise signal that is a voice signal corresponding to a waveform having a medium bandwidth in Table 1 is extracted from the output signal of the pink noise oscillator 2. A plurality of bandpass filters 3, a variable bandwidth bandpass filter 4 for extracting a peak noise signal, which is an audio signal corresponding to the waveform having a wide bandwidth shown in Table 1 from the output signal of the pink noise oscillator 2, and a low frequency Oscillator 1, Pink noise oscillator 2,
It comprises a band pass filter 3 and an audio adjuster 5 for adjusting the audio signal from the band variable band pass filter 4.
The low-frequency oscillator 1 oscillates a specific frequency with respect to the molecular spectrum having a narrow bandwidth in the waveform diagram of cosmic radio waves (Fig. 1), and at least a plurality of them, that is, the number in which the above-mentioned molecular spectrum appears, are prepared. It is desirable that A plurality of band pass filters 3 and variable band width band pass filters 4 are also prepared as in the case of the low frequency oscillator 1. A multi-element graphic equalizer may be used instead of the variable bandwidth band pass filter 4. The voice adjuster 5 is a line amplifier,
It incorporates a program amplifier, various amplifiers, VU meters, etc., and synthesizes the audio signals sent from the low-frequency oscillator 1 etc. Add a volume difference between the bands. The cosmic sound obtained in this way is sometimes monitored by a monitor device such as a speaker or a headphone.
Also, at some time, it is recorded as a cosmic sound by the PCM tape recorder 8 and stored in the magnetic tape cartridge 10, or is recorded on the magnetic tape 9 by the multi-track tape recorder 7 for each waveform signal. To do. Further, the synthesized cosmic sound is input to the frequency direct reading device 11 such as an audio spectrum analyzer or a frequency counter to monitor the frequency of the sound corresponding to each molecular spectrum.

In the embodiment described above, the low frequency oscillator 1, the band pass filter 3, and the variable band width band pass filter 4 are fixedly set to the audible frequencies corresponding to the respective molecular spectra, and the audio waveforms of the respective frequencies are set. However, the configuration is not necessarily limited to this. For example, in a space sound synthesizer as shown in FIG. 6, frequency conversion means for scaling down the frequency band based on the first and second expressions and a waveform for detecting a peak waveform from the output of the frequency conversion means. A reading device may be built-in, and the set values of the low-frequency oscillator 1 and the bandpass filters 3 and 4 may be automatically changed according to the signal from the waveform reading device. By doing so, scale-down to the audio frequency band and voice synthesis can be performed automatically by only inputting various information shown in the waveform diagram of the space radio wave shown in FIG. 1, and operability is improved. By varying the band and bandwidth of space radio waves, various cosmic sounds can be generated and used as clues to know the structure of the universe.

(5) Effects of the Invention As described above, according to the present invention, generally, only a large-scale and complicated device such as a parabolic antenna can be used for catching, and it can be represented only graphically. You will be able to feel the space radio waves as sound. Therefore, it is possible to set the atmosphere as if a sound message is being emitted from space, which is very useful in the field of audio or video.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a waveform diagram obtained by observation of space radio waves, FIG. 2 is a waveform diagram showing a molecular spectrum with the noise level set to 0 in the waveform diagram of FIG. 1, and FIG. Is a waveform diagram of the audio frequency band obtained by scaling down the cosmic radio wave waveform diagram, Fig. 4 is a scale diagram used to scale down the frequency band of the cosmic radio wave of Fig. 1, and Fig. 5 is an audio frequency range. 20H each for the low and high limit frequencies of
z, 20 KHz, and a center frequency of 632 Hz, which represents an audio frequency band. FIG. 6 is a diagram showing a schematic configuration of an apparatus for generating cosmic sound based on the scaled down waveform of cosmic radio waves.

Claims (2)

[Claims] 1. A lower limit of the audible frequency when converting a signal waveform, which is a cosmic radio wave measured in advance in a predetermined frequency range and displayed at frequencies of a uniform scale, into a signal waveform of an audible frequency in a predetermined frequency range. The audible center frequency of the audible frequency is calculated by a predetermined operation from the upper limit frequency, the radio wave center frequency of the space radio wave is scaled down to the audible center frequency, and the signal waveform of the space radio wave is logarithmic with the audible center frequency as a reference. A method of generating cosmic sound, characterized by converting to a audible frequency signal waveform of a scale. 2. A signal waveform of a space radio wave in a predetermined frequency range displayed at a frequency of a uniform scale including a plurality of peak signal components having a wide bandwidth, a medium bandwidth and a narrow bandwidth, is converted by a predetermined conversion method. An oscillator that generates a monotone signal of a specific and variable single frequency within the frequency range of the audio frequency based on the audio frequency signal waveform, and a pink noise signal over the frequency range of the audio frequency. A pink noise oscillator, a plurality of filters for extracting a signal having a predetermined bandwidth from the pink noise signal and transmitting a peak noise signal having a wide bandwidth or a medium bandwidth, the monotone signal, the pink noise signal and the peak noise A cosmic sound generation device comprising: a sound adjuster that adjusts and synthesizes signal levels and outputs a converted output signal.