JPS60157345A - Remote controller - Google Patents

Abstract

PURPOSE:To eliminate the noise which are continuous in a short cycle by using a signal level detected out of the noise component which is continuous in a short cycle within a wavelength range of an infrared ray modulated by a remote control signal to control the detection level of a wave detecting circuit. CONSTITUTION:A photodetecting circuit 2 detects the signal which is modulated by a remote control signal and delivered from a transmitter 1 as well as the noise component and applies them to an integration circuit 4 after amplification 3. The time constant of the circuit 4 is reduced satisfactorily and at the same time the average level of the circuit 4 is detected by a control circuit 6 with a satisfactorily long time constant. The detection level of a wave detecting circuit 5 is varied, and the output of the circuit 4 is detected 5 and delivered 7. Thus the circuit 4 eliminates the component of a single-shot or long-cycle continuous noise with no effect of the remote control signal. The circuit 5 discriminates a remote control signal out of the continuous noise components of short cycles. Thus an accurate remote control operation is attained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a remote controller suitable for a television receiver, etc.
Relating to a control device.

[Background of the invention]

Conventionally, fluorescent lamps have been used in remote control (hereinafter referred to as remote control) devices that use infrared rays as a transmission medium and are used in television receivers and the like.

When infrared rays or sunlight emitted from lighting equipment such as incandescent lamps and infrared lamps are received by the light receiving circuit of the remote control device, the noise caused by these becomes a single or continuous noise component, which affects the remote control signal and causes interference. . Among these noise components, single-shot noise components or continuous noise components with long periods can be removed by integrating the received remote control signal before detecting it, but The noise component appears as a DC component in the output of the light receiving circuit, so if this affects the remote control signal and causes interference, it is necessary to remove the DC noise component and the remote control device may be operated incorrectly. There was a problem.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the prior art, improve the ability to distinguish between short-period continuous noise components and signal components in the infrared wavelength region, and provide a remote control device that allows accurate remote control operation. There is a particular thing.

[Summary of the invention]

In order to achieve the above object, the present invention detects the signal level of a short-period continuous noise component in the infrared wavelength region, and controls the detection level of a detection circuit based on the noise signal level, thereby performing a comparison. It is characterized by being able to remove continuous noise components with short periods.

[Embodiments of the invention]

A remote control device according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing an embodiment of a remote control device according to the present invention, and FIG. 2 shows waveforms of various parts in FIG. 1.

In FIG. 1, 1 is a remote control transmitter using infrared rays as a transmission medium, 2 is a light receiving circuit, 3 is a tuned amplifier circuit, 4 is an integrating circuit, 5 is a detection circuit, 6 detects the average level of the integrating circuit 4, A control circuit for varying the detection level of the detection circuit 5; 7 indicates an output terminal of the detection circuit 5;

In FIG. 2, (α) is the output waveform of the tuned amplifier circuit 3, and (h) is the output waveform of the integration circuit 6 when a single or continuous noise component with a relatively long period is mixed in the remote control signal. (C) shows the output waveform of the integrating circuit 6 when a continuous noise component with a relatively short period is mixed into the remote control signal.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 and 2.

In FIG. 1, the remote control signal is detected by the light receiving circuit 2 at the same time as the noise component, and after being amplified by the synchronous amplifier circuit 6,
It is added to the integrating circuit 4.

If the time constant τ of the integrator circuit is selected to be sufficiently smaller than t shown in Figure 2 (α), it is possible to remove single-shot or long-period continuous noise components without affecting the information in the remote control signal. I can do it. The output of the integrating circuit is applied to a detection circuit.

The original remote control signal (FIG. 2 (α)) is detected as the detection output. The detection level of the detection circuit at this time is shown in Figure 2 (
If you select 'TH+ as shown in hl, the detection circuit 5
Only the original remote control signal is detected at the output. However, if a continuous short-cycle noise component is received together with the remote control signal, the output of the integrating circuit 4 will be as shown in Figure 2(c), and the noise component will be integrated and become a DC component to signal the remote control signal. Therefore, if the detection level of the detection circuit 5 remains at VTHl, the remote control signal cannot be distinguished from the noise components. At this time, the control circuit 6 detects the average value of the received noise component and signal component by integrating with a time constant sufficiently larger than the output t of the integrating circuit 4, and from this average value, Detection circuit 5
By controlling the detection level of , the detection level is increased at VTH2t shown in FIG. 2 (C1).

According to the present invention, a remote control signal can be determined not only from single or long-cycle continuous noise components, but also from short-cycle continuous noise components, and accurate remote control operations can be performed. be.

[Effects of the Invention] As described above, according to the present invention, in a remote control device, not only single or long-cycle continuous noise components in the infrared wavelength region but also short-cycle continuous noise components can be detected. It is possible to distinguish remote control signals and perform accurate remote control operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a remote control device according to the present invention, and FIG.
The figure is a waveform diagram of each part of FIG. 1. 2... Light receiving circuit, 6... Tuned amplifier circuit. 4... Integral circuit. 5...Detection circuit, agent fP burushi column Akira Genius 1 Diagram No.

Claims (1)

[Claims] 1. A light-receiving circuit for receiving the infrared signal in the IJ Mort Huntroll device, which transmits infrared light modulated by a remote control signal and receives the infrared light, thereby making it possible to transmit and receive the signal. an amplifier circuit that amplifies the signal received by the light receiving circuit; an integrating circuit that integrates the output of the amplifier circuit to suppress sporadic noise components; and a remote control circuit that detects the output of the integrating circuit. A detection circuit that detects the signal,
The remote controller is characterized by comprising a control circuit that detects the levels of continuous noise components and DC noise components from the output of the integrating circuit, and controls the detection voltage of the detection circuit based on the level of the noise components. control device.