JPS6121698A - Remote control receiver - Google Patents

Abstract

PURPOSE:To use only one set of a photodetection section and an amplifier section in obtaining plural operating signals by providing plural tuning circuits whose tuning frequencies are different with each other to an output of the amplifier section amlifying a signal from the photodetector section. CONSTITUTION:The 1st and 2nd tuning sections 3, 4 tuned to the 1st and 2nd transmission frequencies from the amplifier section 2 are provided in parallel with the output of the amplifier section 2. When a signal of a frequency is transmitted from the transmission section, the photodetection section 1 detects it and a detection signal is inputted to the amplifier section 2. An output of the amplifier section 2 is transmitted to the 1st and 2nd tuning sections 3, 4, and a signal from the transmission signal appears only from the tuning section having a resonance frequency in matching with the frequency of the transmission signal.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a remote control receiving device.

Configuration of the conventional example and its problems A conventional remote control receiving section is configured as shown in FIG. In other words, there is a light receiving section (,) that receives the transmitted signal, an amplifying section (b) that amplifies the signal received by the light receiving section (a), and a specific single frequency (transmitting and a tuning section (c) for extracting a signal at a certain frequency), each connected in series. However, these two structures have the following problems.

For example, in a product that integrates a television receiver and other equipment (video tape recorder, personal computer, etc.), when operating the television receiver and other integrated equipment by remote control using different transmission frequencies, In the conventional configuration shown in FIG. 2, it is necessary to provide two types of receiving sections, resulting in an increase in cost and the disadvantage that it cannot be made compact.

OBJECTS OF THE INVENTION An object of the present invention is to provide a remote control receiving device with a simple configuration that can remotely control a plurality of devices by receiving signals sent at different transmission frequencies.

Configuration of the Invention The remote control receiving device of the present invention includes a receiving section that receives a signal sent from a transmitting section, an amplifying section that amplifies the signal from the receiving section, and a specific frequency signal that is extracted from the output signal of the amplifying section. and a tuning section that uses the signal as a device operation signal. With,
The tuning section is characterized in that a plurality of tuning circuits having different tuning frequencies are connected in parallel to the output of the amplification section, so that one receiving section and an amplification section can be shared.

Description of examples An embodiment of the present invention will be described below with reference to FIG.

First, in FIG. 1, (1) is a light receiving section that receives a transmission signal from a transmitting device (not shown), (2) is an amplifying section that receives a signal from the light receiving section (1) and amplifies it, and (3 ) is a first tuning section that receives the signal from the amplification section (2) and is tuned to a first transmission frequency, and (4) is a first tuning section (3).
A second tuning section is provided in parallel with the first transmission frequency and is tuned to a frequency different from the first transmission frequency.
) by connecting them in series.

First, when a signal of a certain frequency is sent from the transmitting section, a reverse current flows through the photodiode (5) of the light receiving section (1), and a signal is obtained at the input of the amplifying section (2). The amplifier section (2) amplifies this weak signal and transmits it to the first and second tuning sections (3) in the subsequent stage.
and send to (4). Here, if the frequency of the transmission signal matches the resonant frequency of the first tuning section (3), the signal from the transmission section appears only at the output of the first tuning section (3). Further, if the resonant frequency of the second tuning section (4) is matched, the signal from the transmitting section appears only at the output of the second tuning section (4). The output signal of each tuning section is used as an operation signal for the device.

Therefore, in a product that integrates a television receiver and other equipment, when operating the television receiver and other equipment integrated with it by remote control at different frequencies, the circuit constant of the first tuning section (3) is set to match the transmission frequency of the remote control of the television receiver, and the circuit constant of the second tuning section (4) is set to match the transmission frequency of the remote control of the device having the above value, each tuning section (3) ( 4) Since only the components of each transmitted signal appear in the output, the light receiving section (1) and the amplifying section (2)
) It is no longer necessary to provide two sets of units, resulting in cost reduction.

Effects of the Invention As described above, the remote control receiving device of the present invention includes a plurality of tuning circuits having different tuning frequencies at the output of the amplifying section that amplifies the signal from the light receiving section. Only one unit and amplification unit are required, and the configuration is simple and compact, and the cost can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the remote control receiving device of the present invention;
FIG. 2 is a block diagram of a conventional remote control receiving device. (1)...Receiving section, (2)...Amplifier, (3)...
・First synchronization department, (4)...Second synchronization department agent Yoshihiro MorimotofFigure 7-3

Claims (1)

[Claims] 1. A receiving section that receives the signal sent from the transmitting section, an amplifying section that amplifies the signal from this receiving section, and a tuning section that extracts a specific frequency signal from the output signal of this amplifying section and uses it as a device operation signal. , and the tuning section is configured by connecting a plurality of tuning circuits having different tuning frequencies in parallel to the output of the amplification section.