TWI240501B - Infrared-ray receiver - Google Patents

Abstract

An infrared-ray receiver includes an infrared-ray receiving portion including a photodiode and converting an optical signal to an electric signal, a first amplifier amplifying the converted electric signal, an automatic gain control amplifier receiving an output of the first amplifier and capable of controlling gain, a band pass filter filtering an electric signal of a frequency, a comparator comparing a preset reference DC voltage and an output of the band pass filter, a demodulator demodulating an output of the comparator, an output portion outputting an output signal of the demodulator, a gap time detection portion receiving one of the output of the demodulator and the output of the comparator and detecting a gap time of a signal; and a gain control portion designed to detect the length of a signal detected by the gap time detection portion and control gain of the automatic gain control amplifier according to whether a sustaining time of a gap time included in the detected signal exceeds a preset reference time value.

Description

1240501 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an infrared receiver, and in particular to an infrared receiver with a function of eliminating noise signals, which determines an input based on the characteristics of the input signal. The signal is a noise signal or a normal signal. [Prior art] Korean Patent No. 322520 discloses a typical technology for traditional infrared receiving benefits, which was applied for and patented by a Korean technology company (AD Tech Co., L td ·). This traditional technology cooperates with the first The illustration is as follows. According to the conventional technology shown in Fig. 1, an infrared receiving section 11 including a photodiode detects an infrared wheel-in signal received from the outside, and will. The infrared rays are converted into an electrical signal, because the converted electrical signal is weak, so the signal is amplified to a proper level by a first amplifier i 2, which is designed to convert various circuits (including The weak signal in (re) is amplified to a signal level that can be appropriately controlled. Once the signal amplified by the first amplifier 12 passes an automatic gain control amplifier (AGC amp) 13 designed to control the gain, the gain of the signal can be properly controlled 'by controlling the special current in a circuit The detailed operation of the voltage increase control by voltage or voltage will be described later with the accompanying drawings. Upon passing, the signal of the gain control amplifier 13 is amplified and finally amplified by the control amplifier ^ for 14. The operation of the infrared receiver does not need to be limited to 0 and can be performed normally. Limiting the amplifier 14 to The output signal passes through a bandpass filter that passes ^ infrared ^ 5 carrier frequency signals in the tiger.

1240501 V. Description of the invention (2) f i 1 ter, BPF) 15. 1: Passive components (called coupling capacitors) are inserted in the above components to filter the DC components that may be included in the output signal of each amplifier. However, for the convenience of explanation, the passive components are not marked here. Bandpass The output signal filtered as 15 is input to a gain controller 6 and a comparator 17 according to the output signal of V pass / converted wave state 15 (for example, generated by a remote controller (^ remote control ler) ) For a noise signal or a normal signal, the gain controller 16 generates a gain control current or a gain control voltage to control the gain of the automatic gain control amplifier 13. Comparator 17 compares a reference DC voltage Vref set in advance as a reference (the output signals of j and τ pass filter 15 are not shown in the figure. After a detailed comparison of the operating capacity, it is clear that when comparator 17 is only in bandpass The output signal of the filter 15 and the reference voltage Veref output a desired signal, and the reference voltage Vref is used. The reference voltage Vref is appropriately selected and set by the designer. The output signal of the comparator 7 is input to a demodulator ( demodulator 18, the output signal of the demodulator 18 is output through a Schmitt circuit portion 1 9. In the first figure, the output of the photodiode is passed through various amplifiers and input to an average frequency of about Bandpass filter 15 with tens or hundreds of KHz, the input f ratio, the reference voltage Vref signal level of one of the input signals of the device 17 is called the average output voltage of micro-south of the bandpass filter 15, when it is higher than When the voltage of vref is input to the band-pass filter 15, the comparator 17 converts the voltage into a quasi-signal, and then outputs the converted signal. The output signal passes through the demodulator 18, where The carrier frequency signal is cancelled, so that Part of the package called ,,

1240501 V. Description of the invention (3) L #u of '— " —--------— is discarded and the signal demodulation is completed. When t = the input signal to the infrared receiver, in addition to the infrared component, external = the desired external interference light such as ultraviolet light or sunlight, this. ~ Light is considered to be a noise component, because that is the last thing the designer wants ^ ΪNoise components will also be transmitted to the circuit through the circuit in the infrared receiver, so the possibility of the infrared receiver malfunctioning due to noise Will add two to stabilize the operation of the external receiver, the above external noise must be eliminated

^ For this purpose, in the conventional technique shown in Fig. I, gain control and automatic gain control amplifier 13 are used to eliminate noise. When the input signal is used to make the control signal, the signal is a noise signal. When the gain controller 16 is operated, the gain of the automatic gain control amplifier 13 is reduced. Therefore, the noise a ^ w again reaches the limit of the automatic gain control amplifier 13. When the input signal is 〆2,5 instead of the noise, When the signal is transmitted, the gain controller 6 operates, so that the automatic gain = the gain of the amplifier remains unchanged or increases. Therefore, the noise in the output signal of the demodulator 18 = the switch circuit section 19 is obtained by the above operation. Divide appropriately, so only normal signals are output. ,

f Consider the signal waveform shown in Figure 2 to illustrate a method for detecting a signal that is demodulated and input to the infrared receiver by a remote two-way system as a noise signal or a normal signal. 2 Figure 2 shows the modulated and amplified waveforms of a noise signal 1 and a normal signal 22 input to the infrared receiver. The actual amplitude of the noise signal 21 is smaller than the amplitude of the normal signal 22. However, for convenience of explanation, T On the 2nd

Page 10 1240501 V. Explanation of the invention (4) In the figure, the amplitude of the noise signal 21 is similar to that of a. Although a noise signal component may be included in the amplitude of 4 = No. 22, for the sake of explanation, this component is not allowed. Instructions. … In Tiger 22, for convenience, as shown in Figure 2, the waveform of the normal signal 22, which is input by a remote controller, is obviously different from the noise ρ ° ^ t 丄 U Sparse waveform. In the control signal, a burst signal input period 23 in which a normal signal is loaded in one is not the same as a carrier signal gap, which is the gap time 25). Comparing the burst signal input period 23 and the gap time bracket, In the US, the gate-gap time period of 25 is relatively long. Therefore, the burst signal input ^ takes up no more than 50% of the second signal period. However, as shown in Figure 2, in the case of miscellaneous 1, unlike normal signals, Not present or printed during gap time 25. It is said that the aforementioned conventional patented invention is based on the duty ratio of the infrared signal and the noise signal. According to the conventional technology, for normal remote control signals, the Is 16 operation is controlled, so that during a signal input period, the gain controller 1 g picks up an electric valley charger to charge, and during the time interval, When the capacitor is discharged, the signal input by Zhongshi to the infrared receiver is a noise signal. When the time is short or absent, the capacitor continues to be charged, so that the voltage after the gap of the capacitor exceeds a predetermined voltage, and the automatic gain control amplifier 1 The gain of 3 is controlled by the two voltages of the capacitor. When the voltage between the two ends of the capacitor increases, it will be 1 to 3 to reduce the gain. When the capacitor is picked up. When 1 is reduced, the automatic gain control amplifier 1 3

V. Description of Invention (5). According to the voltage and the direction of the amplifier 13 and the direction of the decrease and decrease of the voltage across the capacitor, the direction of the decrease and the direction of decrease can be switched from g, μ ,,, and ^. Will be restricted. During the time of normal remote control signal conditions, the capacitor in the city of j in the city of K is not over the predetermined voltage during the time of the Fen Lei Fang Lei Yugong Xu Mao. Therefore, 'between the two ends of the capacitor ^ ^ ^ Therefore, Through the automatic gain control to amplify the dangling moon dagger to maintain its amplitude appropriately. The operation overview of the gain controller 16 determines whether to charge or discharge the thunderbolt @ ^ '^ 日息 控制 益 16. ^ ^. ^% ^ Valleyr's output voltage to turn; Hr discharge to automatic gain control and let go ^习 知 苍 凌 夕 # The technical characteristics of the I-Fu technology used to control the amplifier are the sudden burst of the infrared receiver. When it is tuned and thin, it is judged to be the number of the period == period and the total signal period, so the automatic Gain " =, otherwise 'is -noise. The gain of the s-house control amplifier is controlled by the limitation. However, in the conventional practice; ^ β,, ^ ^ M ^ ^^^ u, because the interference from an electric fluorescent lamp is first emphasized ... XD, whose fineness is 4 to about 50%, makes J: work from, & eight Shizhi 1 break, the ratio is similar to the normal competition, in the μ »infrared receiving circuit, the outer # t π, U this It is a normal signal, so that the infrared receiving circuit of a piece of noise 1 is considered to be faulty. The dynamic gain is determined by the noise signal and the gap between the electric signal and the gain. The input to ratio is not higher than the signal. The external ratio of the noise is reduced. The value of (7) in a letter 5 tiger, invention description (7) is used to control the gain of the automatic gain control amplifier 33. The comparator 37 compares a preset reference DC voltage with the output h number of the bandpass filter 35. The demodulator 38 demodulates the output signal of the comparator 37. The output section 39 outputs the output signal of the demodulator 38 to the outside of the infrared receiver. The gap time detector 40 receives one of the signals output from the demodulator 38 and the comparator 37 and detects the gap time of a signal. Figures 4a and 4b show the waveforms of the components of Figure 3, and the operation is described below. Figure 8a shows a normal remote control signal input to the infrared = state, when the gap time of the signal is about 20 ~ 25 milliseconds (ms), the message ;! Natural light (such as sunlight or incandescent electric light), the gap (t: riDl f is not stored on the right is an electric fluorescent lamp and a triple-frequency fluorescent lamp is about 4 to 5 milliseconds (ms). The signal after modulation The gap time does not exceed the demodulation of the households, s, and s, which are rotated by the filter.-The signal does not need the comparator 37. In this case, the demodulator can not pass the demodulator. 38. Connected to the output of demodulator 38, and the input signal of ff detection state 40 is not connected with the reason that demodulator 38 is required. It is later connected to the output of comparator 37, and there is no need to enter the gap time detector. , We must decide to lose the night length, that is, the low evening period (low

1240501 V. Description of the invention (8) P ^ r—10j) 'If the gap time is shorter than the preset predetermined time, the signal noise signal is rotated in, otherwise, the input signal is determined to be a normal distance ΐ = ί㉟, Therefore, the charging / discharging operation of the 'gain controller 36 is controlled by the aforementioned method. The gate gap ^ 3 described 'Because of the difference between the noise signal and the normal remote control signal-there is a difference in length, the predetermined time used as a reference when deciding is set to = the time between the gap between the second noise signal and the normal remote control signal The value is preferably the middle value between the gap times. == If ... Assuming the gap time of the remote control signal is 20 milliseconds and the gap time of the helmet ^ t is 4 milliseconds, the time setting for determining the reference is Qiu ^ ^ When the gap time detector 40 is designed such that When a charging / discharging circuit 1 2 performs a charging operation, a desired forward charging / discharging operation can be obtained only when the output signal of the demodulator 38 is longer than the reference value set as a reference for determination. In various methods of managing the m2, this reference value set in a circuit can be done in a snowy way. For example, the reference value can provide contaminated parts in the gap time detector 40 and control the charge / discharge of the capacitor. The reference time value set by the designer in the same time constant of the voltage can be set by the signal setting-special automatic counting. The above setting reference can be i: method is just an example of many setting methods' various modifications and levels As before = 'the demodulator 38 is not necessary, as shown in Figure 4a and the fourth official output signal of Comparative Benefit 37 or the output signal of the demodulator 38 is input to the gap time detector 4〇 ^ 1240501 5 The invention description (9) is the same as 2. This is because the noise signal is determined to be a value of * seconds, so that the signal before the reference signal (the carrier frequency is filtered out) is set before the demodulation signal. A wave frequency) and resolve the same signal. In the tester 40, it is considered that in addition, the output of the gap time detector 40, 35, 5 is preferably from the comparator 37 or ^^^ can be obtained from the band-pass filter / in other words, even the comparator 37: : 2 out of 8 rounds. Because the low period (plugged in the n output number) does not need to be kept the same, the low period is particularly the charge / discharge characteristics of T0, which may determine the time of the noise signal, because it has 2 capacitors of the charge / discharge gain controller 36. Cry is only continuously charged, which is determined by the voltage or OR-normal signal input to the infrared receiver, which is judged based on this number. I heart I I 4 continuous continuous charge voltage between the two ends of the capacitor or Discharge degree = It is appropriately changed according to the convenience of the designer and the working environment of the present invention. This change is easy to achieve by changing the time constant of the value of the charge or discharge capacitance. Figure 5 shows the present invention An infrared receiver according to another preferred embodiment. The infrared receiver according to another preferred embodiment includes: an infrared detector 51, a first amplifier 52, a second amplifier 53, and a band-pass filter 54. A comparator 55, a demodulator 56, an automatic gain controller 57 and output circuit sections R11 and TR11.

1240501 V. Description of the invention (10)-Infrared debt detector 5 1 detects an infrared signal, and converts the detected signal into an electrical signal by-η. , ≫ A polar body The first amplifier 5 2 will be generated by the infrared detector 51 1. The second soil amplifier is called the second amplifier 5 3 (known as the automatic gain control amplifier, a will automatically amplify the output signal of the first amplifier 52, and its choice is only P). The dynamic gain controller 5 7 controls, In the following description of the present invention, ^ = self-control amplifier is used instead of the second amplifier 53. ~ Increase

The band-pass filter 5 4 filters the signal output from the automatic gain controller 57 to pass a signal of a specific bandwidth, and the band-pass filter 54 filters the special components of the various components in the output signal of the amplifier 53. 9jnL 工 J Comparator 5 5 compares the output signal of bandpass filter 5 4 with _ — voltage. The demodulator 56, which is electrically connected to the comparator 55, is to demodulate the output signal. The flat 5 5 output circuit sections R11 and TR11 are electrically coupled to the demodulator 56, and the output signals of the demodulator 5 6 are outside the infrared receiver. The automatic gain controller 57 benefits the gain of the controller by the fact that the output signal of the demodulator 56 and the low period of the input signal and the noise signal are different. 2. The automatic gain control system is controlled. The automatic gain controller 57, which is one of the main constituent elements, is a circuit of the gain of the industrial gain control amplifier 53. When Vagc lowers the gain of the automatic gain control amplifier 53, Come

Page 17 1240501 V. Description of the invention (Π) The noise signal of the infrared receiver is made. The controller 57 outputs a voltage Vagc to increase or ‘; The 乂 ,, 隹 symbol automatic gain control amplifier 5 3 The selection of individual constituent elements of the present invention is illustrated below. The red work and its fine-grained characteristics cooperate with No. 6 55. Detailed: Shows the automatic gain controller 57, the comparator solution 56 and the output circuit Ri. Comparator 5 5 is composed of two comparators, and the low comparator receives the bandpass; two: two comparators and a high comparator wt® vt hlgh, /; vv ^ 7 button and a ^ ^ ^ RPT ~ n ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ a At the second reference voltage Vt_10w. -hlgh demodulation 1§ 56 is composed of two commentary week cry & taxi. „. 7 weekly device. One demodulator and one low demodulation; the output signal of the comparator is connected to the high resolution And the input of the low demodulator, the low demodulator and the high demodulator are respectively electrically connected to the

Low comparison 1§ and the output voltage of the high comparator, the low demodulator X

Vhigh a demod is connected to the input terminals of the output circuit sections Rn and TRn. The automatic gain controller 5 determines whether the signal transmitted from the demodulator 56 is a noise signal or a normal signal. If the input signal is a noise signal, the automatic gain controller 57 reduces the automatic gain control amplifier. The gain of 53. If the input signal is a normal signal, the automatic gain controller 57 maintains the gain of the self-display control amplifier 53. If there is no signal input, the automatic gain controller 57 increases the gain of the automatic gain control amplifier 53, so , Noise letter

1240501 V. Description of Invention (12) can be controlled by automatic benefits. Effective, limited or eliminated in automatic benefits 3. -The operation of each block in the clock t: is described below. Signal, and the production block 61 receives and composes the rounds of the block to generate a packet of people's internal clock signals CLOCU ~ CLOCKN. Predetermine if the gap time in the round-out signal is greater than-^ GapTlmeSlg "! I · '~ ^ ^ ^ ^ ", J ^ 62 ^ ^ ~ ^ round m is low; and output this signal, otherwise, -load : The second one; the waveform of the normal signal 'The normal signal includes the burst period (d 2) and the carrier that carry the training information: No, the gap time period (gap timeperiod) between the carriers The characteristic of the normal signal input by the controller is that sometimes the gap, such as 筮 Q and fixed milli-seconds, is relatively longer than the gap time of the noise signal. However, as shown in Figure θ, in an external interference noise signal, such as : A ^ = The signal is emphasized and changed to the infrared receiver, and the low and low months of the signal considered to be 1 slot time are relatively short. Figure 9 shows a noise signal, in which a signal whose amplitude is relatively less than its / month period can be considered as the period of the gap time, approximately * no. By applying the difference in duration of the gap time, the input to the "infrared The signal of the receiver is a noise signal or a normal signal. A picture 10 shows a signal from the fluorescent lamp wheel, as shown in Fig. 10. The characteristic of the light signal is that it is considered to be The gap time of the signal is not clearly shown. As mentioned earlier, the gap time of the noise signal is relatively shorter than the normal signal

1240501 V. Explanation of the invention (13) In the gap%, the detector number 6 of k number 6 3 identifies the output signal of demodulator 5 6-a normal signal or a noise signal. As shown in FIG. 8, in the present invention, the low and high period (100wperi d) of the demodulated signal corresponds to the burst period of an optical diode input signal, and the high and high periods of the demodulated signal The period (high period) corresponds to the remaining period of the photodiode input signal. When the demodulated signal and the low period are shorter than a predetermined width, the signal detector 6 3 determines that the signal is a Noise signal 'and the output signal Nos 丨 G of the signal detector 63 is converted into high, high, and s when the low and high periods of the demodulated signal are longer than the predetermined width, the signal detector 6 ^ 3 The output signal NOSIG of the output signal detector 63 is, is, low ,,, in other words, the situation A 'L Ange detector 6 3 The output signal is based on the signal detector block 63 = input signal , And low " durations. The input signal input by Shidang is continuously, high, high, or, low " ^, a pulseless detector (NopuLSE detect〇r) ^ PULSE, high, when a pulse type When the signal is continuously input, no pulse output ^, f yi 64 generates the output signal NopULSE, low, that is, in the non-pulse detection state ^, the output signal, high, low " state depends on the input signal The special test cry ^ The electric controller 65 receives the output signals of the gap time debt detector 62, the signal detection second it it pulseless detector 64, and generates automatic control for the operation of the AGC interface 66 The required signals c-Υ and the helmet and a reset signal GapT imeRst for the gap time detector 62, the signal detector 63 ..., and the debt detector 64. Operational configuration of electric controller 65 and automatic gain controller interface 6 6

Page 20 1240501 V. Description of the invention (14) The simplified circuit diagram and operation timing diagram of the automatic gain controller interface 66 shown in Figs. 11 and 12 are described below. When a signal input to the infrared receiver is a noise signal, because the gap time detector 62 generates an output signal G ap T ime S ig, low ", the signal C_ch of the charge / discharge controller 65 For, and high, a switch SW1 is turned on, which causes the automatic gain controller interface 66 to charge a capacitor C provided therein. Therefore, the output voltage Vagc of the automatic gain controller interface 66 increases. When N0SIG is high at the same time, the following two situations will occur.

The first case is that a noise signal is input. At this time, the signal NOPULSES is low. In this case, the signal C__ch becomes, and high, so that the capacitor in the automatic gain controller interface 66 is charged, and the second This situation is that there is no external input signal, the signal NOPULSE becomes "," and "signal C_dis becomes" high ", and a switch SW2 is turned on, so that the capacitor C in the automatic gain controller interface 66 is discharged.

If the signal GapTimeSig is ', high' and the signal N0SIG is, low, it means that the signal coming from the outside of the infrared receiver is a normal signal. In this case, the signals C-ch and C_dis are maintained at low. " State, the switch SW1 and the switch SW2 are turned off. Therefore, the capacitor in the automatic gain controller interface block 6 6 is not charged or discharged, so that the gain of the automatic gain control amplifier 53 is not changed and remains the same. Briefly summarize the operation of the automatic gain controller interface 6 6. The automatic gain controller interface 6 6 receives the output signals c c h and C a di s of the charge / discharge controller 6 5 and generates a control voltage to control the increase of the automatic gain control amplifier 5 3

P.21 12501501 V. Description of the invention (15) In the foregoing invention, the gain of the automatic gain control amplifier 53 decreases as the voltage Vagc increases, but the form of the automatic gain control amplifier 53 can be various Revise the design. Furthermore, the number of amplifier terminals used in the infrared receiver of the present invention can be augmented as needed. In addition, the capacitor c in the automatic gain controller interface 66 can be charged or discharged according to the convenience of the designer or the Inventive work sets the scene and f: change 'This change can be easily achieved by controlling a time constant by changing the capacitance value used in the charge or discharge capacitor. The operation of the circuit of the present invention shown in Fig. 7 will be described in conjunction with the function and interaction of the blocks of Fig. 6. Figure 13 shows the relationship between the automatic gain control amplifier 5 and the benefit control: Vagc is pressed. It can be seen that the automatic gain control amplifier = designed to increase the amplifier's gain when the voltage Vagc increases. . 53 This month has been described and described in detail with the preferred embodiment. For those skilled in the art, 'should understand that various forms and details can be made,' 'without departing from the spirit and time of the present invention. Please define the scope of the patent and = Τ Β ί Debt Detector can be measured-greater than or less than 2. ~ 25 milliseconds: & day: S: The reference detection of the bluff detector or non-pulse detector is changed as τ, or the reference voltage of the comparator can be changed. ^ Industrial applicability 1f traditional method, in the processing of infrared access signals according to the present invention, taking into account the characteristics of the wheel L j% of the short name surname ^ No. characteristics, that is, noisy signals and legitimate #% are not each other 'The gain of the infrared receiver amplifier can be based on:

Page 1212501

1240501 on page 23 Brief description of the diagram. The first diagram is a block diagram illustrating a conventional infrared receiver. The second diagram is a diagram illustrating an example of waveforms of a noise signal and a normal signal. The third diagram is to illustrate the present invention. A block diagram of an infrared receiver in a preferred embodiment. FIG. 4a is a waveform diagram illustrating a gain controller when a normal signal is input. FIG. 4b is a waveform diagram illustrating a gain controller when a noise signal is input. FIG. 5 is a block diagram illustrating an infrared receiver according to another preferred embodiment of the present invention;

FIG. 6 is a circuit diagram illustrating an automatic gain controller, a comparator, a demodulator, and an output circuit section of the infrared receiver of the present invention; FIG. 7 is a flowchart illustrating an operation of the infrared receiver of the present invention having a noise canceling function; FIG. 8 is a diagram illustrating a preferred embodiment of a normal signal and a demodulated signal input to the infrared receiver; FIG. 9 is a diagram illustrating a fluorescent signal noise signal being emphasized and input to the infrared receiver A diagram of a preferred embodiment inside the receiver; FIG. 10 is a diagram illustrating a preferred embodiment of a fluorescent lamp noise signal which is weakly modulated and input into the infrared receiver;

Figure 11 is a circuit diagram illustrating the interface of an automatic gain controller; Figure 12 is a time chart of Figure 11; and Figure 13 is a diagram showing the relationship between the gain of the automatic gain control amplifier and the control voltage. [Simple description of component symbols]

Page 24 1240501

The diagram briefly explains the infrared receiver 1 1 the first amplifier 1 2 the automatic gain control amplifier 1 3 the limiting amplifier 1 4 the band-pass filter 1 5 the gain controller 1 6 the comparator 1 7 the modulator 1 8 the Schmitt circuit section 1 9 Noise signal 21 Normal signal 22 Burst signal input period 2 3 Gap time 2 5 Infrared receiver 3 1 First amplifier 32 Automatic gain control amplifier 3 3 Limiting amplifier 3 4 Band-pass filter 3 5 Gain controller 3 6 Comparator 3 7 Demodulator 3 8 Output 39 Gap time detector 4 0 Infrared detector 5 1

Page 25 1240501 Brief description of the drawings First amplifier 5 2 Second amplifier, automatic gain control amplifier 5 3 Bandpass filter 54 Comparator 5 5 Demodulator 5 6 Automatic gain controller 5 7 Output circuit sections R11, TR11. Oscillator, Oscillator Block 60

Clock signal generator, clock signal generator block 6 1 Clock signal clockl ~ clockN Time gap detector 6 2 Signal detector, signal detector block 6 3 No pulse detector 64 Charge / discharge controller 65 Automatic gain Controller interface, automatic gain controller interface block 66

Page 26

Claims (1)

1240501 6. The gap time for patent application. 4. According to the infrared receiver described in Item 1 of the declared patent scope, the 1-slot time detector is designed so that a capacitor is only used when the predetermined period of the demodulation signal is longer than—set as a reference for determining the reference ^ = Row discharge.不 不 执 5 · An infrared receiver with noise canceling function, including · = = = infrared signal, and the detected red i = amplifier to amplify the conversion generated from the infrared detector Receiving one of the first amplifier's turn-out signal and being able to control the gain with a second amplifier; into: the various output signals of the second amplifier = comparator, comparing the _ turn-out voltage of the band-passing wave filter With a predetermined reference and a demodulator, demodulate an output signal of one of the comparators; P, turns out the outer surface of one of the output signals of the demodulator; and 4 to 5 external and external receivers-automatic gain controllers, which are based on the solution-feedback control to control the growth of the second amplifier Use 6 times === container and control the electricity for the infrared connection σ feed control described in item 5 of the J range of the month. Switch circuit and a current source sv charging page 28 1240501 f. Application Patent scope container. 7 · The infrared receiver according to the patent application for gain gain control crying item ^ item 5, wherein the interval time; ϋ: # less than or greater than one, detect whether the signal output from the demodulator is transmitted A signal detector pre-tests the test time ② If the person is a normal γ-flavor, it is said that the signal output from the four detectors in the gap is-no pulse; ί;-noisy signal. ;, An output number ^ according to the 仏 number picker, the input signal characteristics determine a charge / discharge batch ⑹ and no pulse price 'receive the gap time accumulator, signal detector 55 m: wheel Output signals and generate the signals required to control an automatic gain control operation, such as c / ch & c ~ dis, and a gap / 0., Detector, signal detector and pulse-free detection The reset signal GapTimeRst of the controller; and the interface of the automatic gain controller, receiving the output signals C — ch and C — dis of the charge / discharge controller, and generating a control voltage Vagc that can control the gain of the second amplifier. 8 · The infrared receiver as described in item 7 of the scope of patent application, wherein when an external signal input to the infrared receiver is a noise signal, the charge / discharge controller is set to the automatic gain controller The capacitor in the interface is charged to increase the output signal voltage Vagc of the automatic gain controller interface. 9 · The infrared receiver as described in item 7 of the patent application scope, wherein when no external signal is input to the infrared receiver The charge / discharge controller discharges 1240501. The patent application scope sets the capacitor set in the interface of the automatic gain controller to reduce the output signal voltage Vagc of the interface of the automatic gain controller. 10. The infrared receiver according to item 7 of the scope of patent application, wherein when an external signal input to the infrared receiver is a normal signal, the charge / discharge controller is set on the automatic gain controller interface. The capacitor is not charged or discharged to maintain the gain of the second amplifier unchanged. Page 30