Unlock instant, AI-driven research and patent intelligence for your innovation.

Filter circuit

A filter circuit and resistor technology, applied in electrical components, impedance networks, transducer acoustic response prevention, etc., can solve problems such as the lack of filter circuits

Inactive Publication Date: 2010-07-21
AUDIO-TECHNICA
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In this way, filter circuits using resistors and capacitors have a characteristic that the phase of the output signal relatively lags as the frequency of the input signal increases, and it is known that the phase of the output signal relatively advances in response to the increase in the frequency of the input signal. characteristics of the filter circuit are not realized

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Filter circuit
  • Filter circuit
  • Filter circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] exist figure 1 In the shown low-pass filter circuit 10, a resistor R1, a resistor R2, and a capacitor C are sequentially connected in series between the input terminal I and the ground G, and at the connection point of the first resistor, that is, the resistor R1, and the second resistor, that is, the resistor R2 An output terminal O for taking out an output signal is provided. The cut-off frequency fclp of the low-pass filter circuit 10 is determined by the time constant determined by the combined resistance R of the resistors R1 and R2 (ie, R1+R2 ) and the capacitance of the capacitor C.

[0037] The output of this low-pass filter circuit 10 is by √((1+(2πfCR2) 2 )) / (1+(2πfC(R1+R2)) 2 )inferred. f is the frequency of the input signal. Similar to conventional low-pass filter circuits, frequencies higher than the cutoff frequency fclp are attenuated. In addition, as the frequency of the input signal increases, the impedance of capacitor C decreases, thus causing t...

Embodiment 2

[0041] figure 2 Another embodiment of the filter circuit of the present invention is shown. figure 2 The shown low-pass filter circuit 20 is an example in which a variable resistor R3 is used instead of the resistors R1 and R2 included in the low-pass filter circuit 10 . In the low-pass filter circuit 20, the output terminal O is provided as a movable terminal of the variable resistor R3.

[0042] That is, since the ratio of the resistors for dividing the input signal can be changed according to the position of the movable terminal, the same performance as that of the case of setting the values ​​of the resistors R1 and R2 according to the predetermined ratio Nr in the first embodiment can be obtained. Effect. Accordingly, a filter circuit having an optimum phase characteristic can be easily obtained.

[0043] Here, the above-mentioned maximum phase lag frequency will be described. The so-called maximum phase lag frequency refers to the frequency at which the phase of th...

Embodiment 3

[0047] Next, other embodiments of the filter circuit of the present invention will be described. Figure 4 is an example of the filter circuit of the present invention, and is a circuit configuration diagram showing an example of a high-pass filter circuit. like Figure 4 As shown, in the high-pass filter circuit 30, a capacitor C1, a capacitor C2, and a resistor R are sequentially connected in series between the input terminal I and the ground G, and an output terminal O for taking out an output signal is provided at the connection point between the capacitor C1 and the capacitor C2. . The cut-off frequency fchp of the high-pass filter circuit 30 is determined by the time constant determined by the composite capacitance C (namely C1+C2) of the capacitors C1 and C2 and the value of the resistor R.

[0048] This high-pass filter circuit 30 outputs frequency components higher than the cutoff frequency fchp, and attenuates frequency components lower than the cutoff frequency fc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A filter circuit includes: an input terminal; a first resistance; a second resistance; a capacitor; and an output terminal, in which the first resistance, the second resistance, and the capacitor are connected in series in this order between the input terminal and a ground point, the output terminal is provided at a connection point of the first resistance and the second resistance, and a frequency domain is used that is higher than a maximum phase delay frequency higher than a cutoff frequency, the cutoff frequency being determined by a combined resistance value of the first and the second resistances and a capacitance value of the capacitor, so that when a frequency of an input signal becomes higher, a phase delay of an output signal relative to the input signal is reduced.

Description

technical field [0001] The present invention relates to a filter circuit, in particular to a filter circuit using the following frequency domain (frequency range): the higher the frequency of the input signal, the more advanced the relative phase of the output signal relative to the input signal; the lower the frequency of the input signal, the more the output signal The smaller the relative phase difference with respect to the input signal. Background technique [0002] Various forms of filter circuits for audio signal processing are well known. A representative filter circuit using an analog circuit includes: a low-pass filter circuit that only passes frequencies lower than the cutoff frequency; a high-pass filter circuit that only passes frequencies higher than the cutoff frequency; A band-pass filter circuit that passes the frequency band between two cut-off frequencies; a notch filter circuit that passes frequencies outside the frequency band between two cut-off freque...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/02H04R1/10
CPCH03H7/01H03H11/04
Inventor 木村富至
Owner AUDIO-TECHNICA