TWI657326B - Flow control device and flow control signal generating device for generating dc control signal based on audio signal thereof - Google Patents

Abstract

A flow control device includes a flow control signal generating device for generating a DC control signal according to an audio signal and at least one proportional valve. The flow control signal generating device comprises a sound source receiving module, a filter rectifying module, a microprocessor and a proportional valve control signal generating module. The filter rectifier module filters one of the audio signals provided by the sound source receiving module to generate at least a continuous stream of audio signals. The microprocessor generates a plurality of time period attenuation values based on the DC audio signal. The proportional valve control signal generation module filters the audio signal and attenuates according to the period attenuation value, and then performs filtering and rectification to generate a DC control signal, so that the proportional valve controls the proportion of the proportional valve according to the DC control signal. .

Description

Flow control device and its generation based on audio signals Flow control signal generating device for DC control signal

The invention relates to a flow control device and a flow control signal generating device, in particular to a flow control device and a flow control signal generating device for generating a DC control signal according to an audio signal.

Generally speaking, in the event of a large-scale event such as a party, in order to promote the atmosphere of joy, sometimes it will create some sound and light effects that attract people's attention. The most common is the playing of music. In recent years, more and more people have chosen. Use the performance of the fire dance to stir up the atmosphere.

According to the above, the performance of the fire dance mainly uses the flow controller to analyze the volume of the audio signal, and then controls the flow of the flammable gas according to the volume, so that the size of the flame can vary with the volume; When it is a music composed of a single instrument or vocal, the change of fire dance will appear to change with the rhythm of the music because of the obvious size, but when the audio is composed of various instruments and vocals When the music is played, it is very likely that the audio of the various instruments is mixed with the audio of the human voice, which causes the music to have a rhythm change, but it is always at a high volume. At this time, the existing flow controller can only control the flame to release a large amount of release. And then can not make people feel the rhythm of music.

In view of the fact that the existing flow controller mainly controls the flow change of the flammable gas according to the change of the volume of the music, thereby changing the size of the flame, when the music is made up of various audios, the volume change of the music is The rhythm changes are likely to be inconsistent, so that the fire dance controlled by the existing flow controller cannot change with the rhythm, and people can not feel the rhythm of the music through the fire dance change; thus, the main purpose of the present invention is to provide a The flow control device and a flow control signal generating device for generating a DC control signal according to the audio signal, so that the fire dance can change with the rhythm of the music.

In order to achieve the above object, the necessary technical means adopted by the present invention is to provide a flow control signal generating device for generating a DC control signal according to an audio signal, which is used for controlling a fluid supplied from a fluid supply source to flow through a proportional valve to a nozzle. The flow control signal generating device comprises a sound source receiving module, a filter rectifying module, a microprocessor and a proportional valve control signal generating module.

A sound source receiving module is used to provide an audio signal. The filter rectifier module is electrically connected to the sound source receiving module for filtering the audio signal to generate at least a continuous audio signal. The microprocessor is electrically connected to the filter rectifier module for analyzing at least the audio signal at all times A plurality of time period intensity values are generated for the intensity of the plurality of time periods, and the time period intensity value and the predetermined attenuation intensity value are compared to generate a plurality of time period attenuation values.

The proportional valve control signal generating module comprises a first low pass filter, an attenuator, a second low pass filter and a first rectifying filter.

The first low pass filter is electrically connected to the sound source receiving module for receiving and filtering the audio signal, thereby generating a first low frequency band signal, and the frequency of the first low frequency band signal is below a first frequency. The attenuator is electrically coupled to the first low pass filter and the microprocessor, and attenuates the intensity value of the first low frequency band signal to approach the preset attenuation intensity value according to the time period attenuation value. The second low pass filter is electrically connected to the attenuator for receiving and filtering the first low frequency band signal, thereby generating a second low frequency band signal, wherein the frequency of the second low frequency band signal is less than the first frequency Below two frequencies. The first rectification filter is electrically connected to the second low pass filter for rectifying the second low frequency band signal into a DC control signal, and transmitting the DC control signal to a proportional valve, so that the proportional valve is based on the DC control signal Control the proportion of proportional valve opening.

In an auxiliary technical means derived from the above-mentioned necessary technical means, the filter rectifier module comprises a high pass filter and at least one rectification filter unit. The high pass filter is electrically connected to the sound source receiving module for receiving and filtering the volume control signal, thereby generating a first high frequency band signal, and the frequency of the first high frequency band signal is above a third frequency. The rectifying and filtering unit is electrically connected to the high pass filter and the microprocessor to rectify and filter the first high frequency band signal into at least a continuous stream audio Signal and transmit at least the audio signal to the microprocessor.

Preferably, the filter rectifier module further comprises a first signal amplifier disposed between the high pass filter and the at least one rectifying and filtering unit for amplifying the signal strength of the first high frequency band signal.

In one embodiment, the rectifying and filtering unit includes a second rectifier and a second signal amplifier. The second rectifier is electrically coupled to the first signal amplifier for receiving the first high frequency band signal and for the first high frequency band signal. Perform rectification. The second signal amplifier is electrically coupled to the second rectifying filter and the microprocessor for amplifying the signal strength of the rectified first high frequency band signal and transmitting the signal to the microprocessor.

In one embodiment, the rectifying and filtering unit includes a third low pass filter and a third rectifying filter, and the third low pass filter is electrically coupled to the first signal amplifier for receiving and filtering the first high frequency band. The signal causes the frequency of the first high frequency band signal to be below a fourth frequency. The third rectifying filter is electrically coupled to the third low pass filter and the microprocessor for rectifying the frequency to the first high frequency band signal below the fourth frequency.

In an embodiment, the rectifying and filtering unit includes a band pass filter and a fourth rectifying filter. The band pass filter is electrically connected to the first signal amplifier for receiving and filtering the first high frequency band signal, so that the frequency of the first high frequency band signal is within a segment frequency. The fourth rectifying filter is electrically coupled to the band pass filter and the microprocessor for rectifying the frequency filtered to the first high frequency band signal within the segment frequency.

The invention is used to solve the problems of the prior art Another technically necessary means is to provide a flow control device comprising the above-mentioned flow control signal generating device for generating a DC control signal according to an audio signal and at least one proportional valve.

As described above, the flow control device provided by the present invention and the flow control signal generating device for generating the DC control signal according to the audio signal mainly use the signal filtering rectifier module to filter the audio signal, and thus can be used for the audio signal of a specific frequency band. A DC control signal is generated such that the proportional valve adjusts the flow of fluid through the proportional valve to the nozzle based on the DC control signal.

100, 100a‧‧‧ flow control equipment

1‧‧‧Dynamic control signal based on audio signal Flow control signal generating device

11‧‧‧Source Receiver Module

111‧‧‧Source output unit

1111‧‧‧Left channel output interface

1112‧‧‧Right channel output interface

112‧‧‧Mixer

12‧‧‧Signal Filter Rectifier Module

121‧‧‧High Pass Filter

122‧‧‧First Signal Amplifier

123‧‧‧Rectifier Filter Unit

1231‧‧‧Secondary rectifier filter

1232‧‧‧second signal amplifier

124‧‧‧Rectifier Filter Unit

1241‧‧‧ third low pass filter

1242‧‧‧ Third rectification filter

125‧‧‧Rectifier Filter Unit

1251‧‧‧With filter

1252‧‧‧4th rectification filter

13‧‧‧Microprocessor

14‧‧‧Proportional valve control signal generation module

141‧‧‧First low pass filter

142‧‧‧Attenuator

143‧‧‧ Third Signal Amplifier

144‧‧‧Second low pass filter

145‧‧‧fourth signal amplifier

146‧‧‧First rectification filter

147‧‧‧ Fifth Signal Amplifier

S1‧‧‧Audio signal

S2‧‧‧ first high frequency band signal

S3‧‧‧DC audio signal

S4‧‧‧DC audio signal

S5‧‧‧DC audio signal

S6‧‧‧ time decay value

S7‧‧‧Average volume signal

2, 2a, 2b, 2c‧‧‧ proportional valve

S8, S8a, S8b, S8c‧‧‧ DC control signals

200‧‧‧ Fluid supply source

300, 300a, 300b, 300c‧‧‧ nozzle

The first figure shows a block diagram of a flow control signal generating device for generating a DC control signal according to an audio signal according to a first preferred embodiment of the present invention; the second figure shows a block diagram of a sound source receiving module; A block diagram of a signal filtering rectifier module is shown; a fourth block diagram showing a proportional valve control signal generating module; and a fifth drawing showing a system diagram of a flow control device according to a second preferred embodiment of the present invention.

Specific embodiments of the present invention will be described in more detail below with reference to the drawings. According to the following description and patent application The advantages and features of the present invention will be more apparent. It should be noted that the drawings are all in a very simplified form and both use non-precise proportions, and are only for convenience and clarity to assist the purpose of the embodiments of the present invention.

Please refer to the first to fourth figures. The first figure shows a block diagram of a flow control signal generating device for generating a DC control signal according to an audio signal according to the first preferred embodiment of the present invention; and the second figure shows the sound source receiving. The block diagram of the module; the third diagram shows the block diagram of the signal filter rectifier module; the fourth diagram shows the block diagram of the proportional valve control signal generation module.

As shown in the figure, a flow control device 100 includes a flow control signal generating device 1 for generating a DC control signal according to an audio signal, and a proportional valve 2.

The flow control signal generating device 1 includes a sound source receiving module 11, a signal filtering rectifier module 12, a microprocessor 13, and a proportional valve control signal generating module 14.

The audio source receiving module 11 is configured to provide an audio signal S1, and includes a sound source output unit 111 and a mixer 112. The sound source output unit 111 includes a left channel output interface 1111 and a right channel output interface 1112. In practice, the sound source receiving module 11 is configured to receive sound source signals from Bluetooth, USB flash drives, radio or wired inputs, and process the sound source signals into left channel audio and right channel audio, and left channel audio. Outputted by the left channel output interface 1111, the right channel audio is output by the right channel output interface 1112, and then the mixer 112 integrates the left channel audio and the right channel audio into an audio signal S1 output.

The signal filtering rectifier module 12 includes a high pass filter 121. A first signal amplifier 122, a rectifying and filtering unit 123, a rectifying and filtering unit 124, and a rectifying and filtering unit 125.

The high pass filter 121 is electrically connected to the sound source receiving module 11 for receiving and filtering the audio signal S1, thereby generating a first high frequency band signal S2, and the frequency of the first high frequency band signal S2 is above a third frequency. The third frequency is between 10 Hz and 50 Hz, so that the unwanted signal in the audio signal S1 is filtered out through the high pass filter 121.

The first signal amplifier 122 is electrically coupled to the high pass filter 121 for receiving the first high frequency band signal S2 and amplifying the signal strength of the first high frequency band signal S2.

The rectifying and filtering unit 123 includes a second rectifying filter 1231 and a second signal amplifier 1232. The second rectifying filter 1231 is electrically connected to the first signal amplifier 122 for receiving the first high frequency band signal S2 whose signal intensity is amplified, and rectifying and filtering the first high frequency band signal S2; and the second signal amplifier The 1232 is electrically coupled to the second rectifying filter 1231 for re-amplifying the signal strength of the first high-band signal S2 that is rectified and filtered by the second rectifying filter 1231, thereby generating a DC audio signal S3. The rectifying and filtering unit 123 mainly uses the second rectifying filter 1231 to adjust the first high-band signal S2 to the DC electronic signal, and then the second signal amplifier 1232 to amplify the signal strength of the electronic signal. In more detail, the DC audio signal S3 is mainly used to filter and smooth the first high frequency band signal S2 above 50 Hz into a DC audio signal S3 through the second rectifying filter 1231, and the DC audio signal S3 is a DC voltage level.

The rectifying and filtering unit 124 includes a third low pass filter 1241 and a third rectifying filter 1242. The third low pass filter 1241 is electrically coupled to the first signal amplifier 122 for receiving the first high frequency band signal S2 whose signal intensity is amplified, and rectifying and filtering the first high frequency band signal S2 to make the first high The frequency of the frequency band signal S2 is below a fourth frequency; and the third rectifying filter 1242 is electrically coupled to the third low pass filter 1241 for filtering the frequency to the first high frequency band signal S2 below the fourth frequency. Rectification, which in turn produces a constant stream audio signal S4. The fourth frequency is between 100 Hz and 400 Hz, and the rectifying and filtering unit 124 mainly filters the bass tempo signal through the third low pass filter 1241 and amplifies the signal strength through the third rectifying filter 1242.

The rectifying and filtering unit 125 includes a band pass filter 1251 and a fourth rectifying filter 1252. The band pass filter 1251 is electrically connected to the first signal amplifier 122 for receiving the first high frequency band signal S2 whose signal intensity is amplified, and filtering the first high frequency band signal S2, so that the first high frequency band signal S2 is The frequency is limited to be within a segment frequency; and the fourth rectifying filter 1252 is electrically coupled to the band pass filter 1251 for rectifying the frequency to the first high frequency band signal S2 within the segment frequency, thereby generating a continuous current. Audio signal S5. The low threshold value of the segment frequency may be between 100 Hz and 300 Hz, and the high threshold may be between 1000 Hz and 2000 Hz, so that the portion of the first high frequency band signal S2 related to the vocal frequency is filtered out.

The microprocessor 13 is electrically connected to the second signal amplifier 1232, the third rectifying filter 1242, and the fourth rectifying filter 1252, and is configured to analyze the intensities of the DC audio signals S3, S4, and S5 in a plurality of time periods to generate a complex number. Time intensity values and compare time strength values A plurality of time period attenuation values S6 are generated with a predetermined attenuation intensity value. The microprocessor 13 uses the DC voltage level as a gain control reference for the dynamic range control of the audio signal S1. In addition, when the microprocessor 13 compares the DC audio signal S4 with the DC audio signal S5 to determine that the DC audio signal S5 belonging to the human voice is less than the DC audio signal S4 belonging to the bass, the microprocessor 13 controls the rectification filtering unit 125 to When the first high-band signal S2 is rectified and filtered into the DC audio signal S5, it is slightly attenuated (for example, 3dB, dB means 10 * 1g (P2/P1), where P1 refers to the value before attenuation, and P2 refers to after attenuation. The value), to avoid the judgment of the rhythm change because the signal of the vocal is too large.

As shown in the following Table 1, the rectifying and filtering unit 123 is taken as an example. For example, the cutting segment is performed every 1 second, and the preset attenuation intensity value is, for example, -25 dB in this embodiment, so that the corresponding correspondence can be calculated. Attenuation value at each time period.

The proportional valve control signal generating module 14 includes a first low pass filter 141, an attenuator 142, a third signal amplifier 143, a second low pass filter 144, a fourth signal amplifier 145, and a first rectification. Filter 146 and a fifth signal amplifier 147.

The first low pass filter 141 is electrically connected to the audio source receiving module 11 for receiving and filtering the audio signal S1, thereby generating a first low frequency band signal, and the frequency of the first low frequency band signal is about 6000 Hz or less.

The attenuator 142 is electrically connected to the first low pass filter 141 and the microprocessor 13, and attenuates the intensity value of the first low frequency band signal to a preset attenuation intensity value according to the time period attenuation value S6, for example, Table 1 It is shown that during the period 0-1 (seconds), the period attenuation value S6 is -17 dB, so the intensity value of the first low-band signal is attenuated and approaches the preset attenuation intensity value (-25 dB).

The third signal amplifier 143 is electrically coupled to the attenuator 142 for amplifying the intensity value of the attenuated first low frequency band signal.

The second low pass filter 144 is electrically coupled to the third signal amplifier 143 for receiving and filtering the first low frequency band signal, thereby generating a second low frequency band signal. The frequency of the second low frequency band signal is in this embodiment. It is 200HZ and the intensity of the first low-band signal is attenuated by 3.5dB.

The fourth signal amplifier 145 is electrically connected to the second low pass filter 144 for amplifying the intensity value of the second low frequency band signal. Further, the fourth signal amplifier 145 is electrically connected to the microprocessor 13, and The processor 13 transmits one of the static flame height control signals S7 to the fourth signal amplifier 145 even when the DC audio signals S3, S4 or S5 are not received.

The first rectifying filter 146 is electrically coupled to the fourth signal amplifier 145 for rectifying and filtering the second low-band signal into a DC control signal S8. The first rectification filter 146 is actually a positive half-wave rectification filter, and the DC control signal S8 is a rectified and filtered DC signal.

The proportional valve 2 is electrically connected to the fifth signal amplifier 147 for receiving the DC control signal S8, and controls the proportional valve opening ratio according to the DC control signal S8.

Please refer to the fifth figure, which is a schematic diagram showing the system of the flow control device provided by the second preferred embodiment of the present invention. As shown, the flow control device 100a of the present invention includes the above-described flow control signal generator 1 and four proportional valves 2, 2a, 2b and 2c. The proportional valves 2a, 2b and 2c correspond to the proportional valve 2 described above. Thereby, the flow control signal generator 1 can generate and transmit four DC control signals S8, S8a, S8b and S8c to proportional valves 2, 2a, 2b and 2c, respectively, whereby proportional valves 2, 2a, 2b and 2c control proportional valves 2, 2a, 2b and 2c according to DC control signals S8, S8a, S8b and S8c, respectively The ratio of opening is controlled such that the flow of fluid supplied from the fluid supply source 200 to the nozzles 300, 300a, 300b, and 300c is controlled in synchronization. In practice, the fluid supplied by the fluid supply source 200 may be a liquid gas or a liquid, when the fluid is a liquid gas, it is used for a fire dance performance, and when the fluid is a liquid, it can be used for a water dance performance. .

In summary, the flow control device provided by the present invention and the flow control signal generating device for generating a DC control signal according to the audio signal mainly use the signal filtering rectifier module to filter the audio signal, thereby being capable of targeting the audio signal of a specific frequency band. The DC control signal is generated to cause the proportional valve to adjust the flow of the fluid to the nozzle via the proportional valve according to the DC control signal.

The above is only a preferred embodiment of the invention and is not intended to limit the invention. Any changes in the technical means and technical contents disclosed in the present invention may be made by those skilled in the art without departing from the technical means of the present invention. The content is still within the scope of protection of the present invention.

Claims (12)

A flow control signal generating device for generating a DC control signal according to an audio signal, configured to control a flow of a fluid provided by a fluid supply source to a nozzle through a proportional valve, the flow control signal generating device comprising: a sound source receiving module For providing an audio signal, a signal filtering rectifier module is electrically connected to the sound source receiving module for filtering the audio signal to generate at least a continuous audio signal; and a microprocessor is electrically connected. The signal filtering rectifier module is configured to analyze the intensity of the at least one stream audio signal in the plurality of time periods to generate a plurality of time period intensity values, and compare the time period intensity values with a predetermined attenuation intensity value to generate a plurality of time values. And a proportional valve control signal generating module, comprising: a first low pass filter electrically coupled to the sound source receiving module for receiving and filtering the audio signal, thereby generating a first low a frequency band signal, the frequency of the first low frequency band signal is below a first frequency; an attenuator is electrically coupled to the first low pass filter And the microprocessor, and attenuating the intensity value of the first low frequency band signal to approach the preset attenuation intensity value according to the period attenuation values; and a second low pass filter electrically coupled to the attenuator The first low frequency band signal is received and filtered to generate a second low frequency band signal, the frequency of the second low frequency band signal is less than a second frequency less than the first frequency; and a first rectification filter Electrically coupled to the second low pass filter The device is configured to rectify the second low-band signal into a DC control signal, and transmit the DC control signal to a proportional valve, so that the proportional valve controls the proportional valve opening ratio according to the DC control signal. The flow control signal generating device for generating a DC control signal according to the audio signal according to the first aspect of the patent application, wherein the signal filtering rectifier module comprises: a high pass filter electrically connected to the sound source receiving module; Receiving and filtering the volume control signal to generate a first high frequency band signal, wherein the frequency of the first high frequency band signal is above a third frequency; and at least one rectifying and filtering unit is electrically coupled to the high pass filter And the microprocessor, for rectifying and filtering the first high frequency band signal into the at least DC audio signal, and transmitting the at least DC audio signal to the microprocessor. The flow control signal generating device for generating a DC control signal according to the audio signal according to the second aspect of the patent application, wherein the signal filtering rectifier module further comprises a first signal amplifier disposed on the high pass filter and the at least A rectifying and filtering unit is configured to amplify the signal strength of the first high frequency band signal. A flow control signal generating device for generating a DC control signal according to an audio signal according to Item 3 of the patent application, wherein The at least one rectifying and filtering unit includes: a second rectifier electrically coupled to the first signal amplifier for receiving the first high frequency band signal and rectifying the first high frequency band signal; and a second signal amplifier And electrically coupled to the second rectifying filter and the microprocessor, for amplifying the signal strength of the rectified first high frequency band signal and transmitting the signal to the microprocessor. The flow control signal generating device for generating a DC control signal according to the audio signal according to the third aspect of the patent application, wherein the at least one rectifying and filtering unit comprises: a third low pass filter electrically coupled to the first a signal amplifier for receiving and filtering the first high frequency band signal such that the frequency of the first high frequency band signal is below a fourth frequency; and a third rectifying filter electrically coupled to the third low pass filter And the microprocessor, for filtering the frequency to the first high frequency band signal below the fourth frequency for rectification. The flow control signal generating device for generating a DC control signal according to the audio signal according to Item 3 of the patent application, wherein the at least one rectifying and filtering unit comprises: a band pass filter electrically coupled to the first signal amplifier, Receiving and filtering the first high frequency band signal, so that the frequency of the first high frequency band signal is within a segment frequency; and a fourth rectifying filter electrically coupled to the band pass filter and the micro The processor is configured to filter the frequency to the first high frequency band signal within the segment frequency for rectification. A flow control device includes: a flow control signal generating device for generating a DC control signal according to an audio signal, comprising: a sound source receiving module for providing an audio signal; and a signal filtering rectifier module electrically coupled to The sound source receiving module is configured to filter the audio signal to generate at least a continuous audio signal; a microprocessor is electrically connected to the signal filtering rectifier module for analyzing the at least all-current audio signal in a plurality of time periods The intensity of the medium generates a plurality of time period intensity values, and compares the time period intensity values with a predetermined attenuation intensity value to generate a plurality of time period attenuation values; a proportional valve control signal generation module comprising: a first low pass filter The device is electrically coupled to the audio source receiving module for receiving and filtering the audio signal to generate a first low frequency band signal, the frequency of the first low frequency band signal being below a first frequency; an attenuator Electrically coupled to the first low pass filter and the microprocessor, and attenuating the intensity value of the first low frequency band signal according to the period attenuation values Approaching the predetermined intensity attenuation value; a second low pass filter, based electrically connected to the attenuator for receiving and filtering the first low-band signal, thereby generating a second a low frequency band signal, the frequency of the second low frequency band signal is below a second frequency less than the first frequency; and a first rectifying filter electrically coupled to the second low pass filter for The second low-band signal is rectified into a DC control signal; and at least one proportional valve is connected between the fluid supply source and the at least one nozzle, and is electrically connected to the proportional valve control signal generating module. Receiving the DC control signal, and the at least one proportional valve controls a flow rate of the fluid of the fluid supply source to the at least one nozzle through the at least one proportional valve according to the DC control signal. The flow control device of claim 7, wherein the signal filtering rectifier module comprises: a high pass filter electrically coupled to the sound source receiving module for receiving and filtering the volume control signal, And generating a first high frequency band signal, the frequency of the first high frequency band signal is above a third frequency; and at least one rectifying and filtering unit is electrically connected to the high pass filter and the microprocessor, The first high frequency band signal is rectified and filtered into the at least DC audio signal, and the at least DC audio signal is transmitted to the microprocessor. The flow control device of claim 7, wherein the signal filtering rectifier module further comprises a first signal amplification The device is disposed between the high pass filter and the at least one rectifying and filtering unit for amplifying the signal strength of the first high frequency band signal. The flow control device of claim 9, wherein the at least one rectifying and filtering unit comprises: a second rectifier electrically coupled to the first signal amplifier for receiving the first high frequency band signal, And rectifying the first high frequency band signal; and a second signal amplifier electrically coupled to the second rectifying filter and the microprocessor for converting the signal strength of the first high frequency band signal that is rectified Zoom in and transfer to the microprocessor. The flow control device of claim 9, wherein the at least one rectifying and filtering unit comprises: a third low pass filter electrically coupled to the first signal amplifier for receiving and filtering the first a high frequency band signal such that the frequency of the first high frequency band signal is below a fourth frequency; and a third rectifying filter electrically coupled to the third low pass filter and the microprocessor for The frequency is filtered to the first high frequency band signal below the fourth frequency for rectification. The flow control device of claim 9, wherein the at least one rectifying and filtering unit comprises: a band pass filter electrically coupled to the first signal amplifier for receiving and filtering the first high frequency band signal To make the first high frequency band The frequency of the signal is within a segment frequency; and a fourth rectifying filter is electrically coupled to the band pass filter and the microprocessor for filtering the frequency to the first high frequency band within the segment frequency The signal is rectified.