JPS6243296A - Signal receiving circuit system - Google Patents

Abstract

PURPOSE:To improve a connection rate and signal transmission efficiency by switching a receiving circuit to the holding side when an abnormal signal is received and continuing decision whether the signal is normal or not until a normal signal is picked up. CONSTITUTION:If relays A0, A2, and A are operated to indicate reception of three frequencies, namely, an abnormal signal, a relay NO is operated. Then, a switching relay T is operated, and operating circuits of relays A0-A7 are switched to the side of holding circuits by its contact (t). The frequency noise of the relay A2 operated by noise disappears by this switching, and only relays A0 and A7 for normal signals remain when the relay A2 is released, and a relay OK is operated by a known 2-out-of-5 check circuit to detect reception of multifrequency signals by relays A0 and A7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a receiving circuit system for signals (eg, multi-frequency signals), and more particularly, to a circuit system suitable for receiving signals with a lot of noise.

[Background of the invention]

Conventionally, when sending a signal from point A and receiving the signal at point B (including cases where point A and point B are at the same location), for example, when receiving a multi-frequency signal, the crossbar C400 method P6 is used.
58-363 r 8.6 MF person register” (Showa 4
When a signal was received, it was immediately determined whether the signal was normal, and if it was not normal, the call was discarded. In this way, A
If there is a lot of noise between point and point B, there will be many cases where abnormality is determined, that is, more calls will be discarded, and the call completion rate will deteriorate.

[Purpose of the invention]

The purpose of this invention is to send a signal from point A and receive the signal at point B (including cases where A and B are at the same location).
The purpose is to efficiently send and receive signals even when there is a lot of noise between points A and B.

In other words, do not immediately judge an abnormality due to noise, and as much as possible,
The object of the present invention is to provide a circuit system that attempts to pick up normal signals from noise.

[Summary of the invention]

The present invention is effective when noise does not continue for a certain period of time or more. On the receiving side, receive the signal, for example, 2
If it is checked using the Out 5 method and it is determined that the signal is not normal, the receiving circuit is switched to the holding circuit side, and as time passes, the initially received noise disappears and the receiving circuit is switched to the holding circuit. The aim is to prevent the noise generated after the nuclear switch from entering the receiving circuit. As a result, only the normal signal remains at the end.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a signal receiving circuit showing an embodiment of the present invention using a known multi-frequency 27-output-5 signal system, and FIG. 2 is an operational diagram thereof. In Figure 1, a multi-frequency input signal enters the signal receiver and its output is AO to A.
This is illustrated by the operation of the 71J Ray. When receiving the AO frequency among the 5 frequencies, the AD IJ relay, and below when receiving the A1 frequency, the A1 relay is A2 and A2. When A4 receives A4 and A7 frequencies, A71J Ray operates. A normal signal is a combination of two frequencies, and only one frequency or five or more frequencies is an abnormal signal. As shown in the operation diagram in Figure 2, now AO, A
When relays 2 and A7 operate and indicate 3-frequency reception, that is, an abnormal signal, the well-known 27
The NO relay is operated by the check circuit of OUT OF 5. As a result, a switching relay T is operated by a circuit not shown, and its contact t switches the operating circuit of the An-A7') relay to the holding circuit side. On the other hand, as shown in the operation explanatory diagram of FIG. 2, just before the T relay operates, noise is added, and the A4 relay is also operating. Now, by switching the operating circuit to the holding circuit, the A2 relay, which was operating due to noise, will be restored when the A2 frequency noise disappears, and the A4 relay will be restored in the same way.

Thereafter, noise shown by the dotted line in FIG. 2 enters, and even if it appears in the output of the signal receiver, A1. The A21J relay has its operating circuit cut off by the T relay, so it will not operate again. Second
As shown in the figure, when the A4 noise disappears and the A41J relay is restored, only the normal signals AO and A7 remain, and the OK relay is operated by a known 2-out-of-five check circuit, and the multi-frequency signals AO and A7 are activated. I know that I have received the .

〔Effect of the invention〕

According to the present invention, when receiving a noisy signal, when an abnormal signal is received, unlike the conventional method, the receiving circuit is not immediately restored, but the following method can be performed.
Since noise can be removed and only normal signals can be picked up and received, the connection rate can be improved and signal transmission efficiency can be improved.

The normal signal pickup method according to the present invention switches the receiving circuit to the holding side when an abnormal signal is received.
The goal is to continue determining whether the signal is normal until a normal signal can be picked up.

Note that if a normal signal is not received, the determination may be terminated after a certain period of time and the reception may be abandoned.

Although one embodiment of the present invention has been explained using a circuit using a relay, it can be easily implemented using electronic components such as an IC or a transistor.

[Brief explanation of the drawing]

FIG. 1 is a signal receiving circuit diagram showing an embodiment of the present invention, and FIG. 2 is an operation explanatory diagram showing an outline of the operation of FIG. 1. AO, AI, A2, A4, A7...
Relay, t...Relay contact.

Claims (1)

[Claims] 1. A signal receiving circuit system characterized in that when it is determined that the received signal is not normal, the receiving circuit is switched to the holding side and then continues to determine whether the received signal is normal.