JPS5864861A - Discriminating method for reception signal - Google Patents

Abstract

PURPOSE:To ensure the discrimination between a digital and an analog signal and to automize the switching of a reception means, by using signal characteristics at a base region of the digital and analog signals. CONSTITUTION:A base band signal Si is branched, and the result is applied to a switching circuit 303 and an analog out-band component detection circuit 302. A control signal Sc is given from the circuit 302 to the circuit 303. When the signal Si has an analog signal out-band component, the circuit 303 is connected to an output terminal 304 used for a digital signal with the signal Sc, and when the signal Si has no component at the analog signal out-band, the circuit 303 is connected to an output terminal 305 used for an analog signal with the signal Sc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transmitting and receiving signals, particularly in a system that transmits and receives signals by switching between digital and analog signals. The present invention relates to a method for automatically switching input signals to nine receiving means according to the result.

Using a system that switches and transmits analog and digital signals, for example, when transmitting audio signals, it is usually transmitted in 7 ρ codes, and during important conversations, Confucian codes are added to the encrypted digital code. It becomes possible to correct and transmit the data. However, the receiving means for digital signals and 7SPG bonds are different. On the receiving side, when receiving a digital signal, it is necessary to identify the code and extract the synchronization signal, but when receiving Anajig No. 91, such operations are not necessary. Therefore, it is necessary to determine whether the input signal is a digital signal or an analog signal, and to switch the receiving means according to the input signal.

A conventional method of randomly determining whether an input signal is a digital signal or an analog signal and switching the =i value means will be explained. Conventional methods take advantage of the fundamental, band-based nature of the input signal.

Conventionally, when the human power value number is a digital signal, it is detected whether the number 1 is extracted or not.

A reception signal determination method is used in which the input signal is determined to be a digital signal if the synchronization signal is detected, and is determined to be an analog signal if the synchronization signal is not detected, and the receiving means t1jJ is switched according to the result of the first determination.

A configuration of 110 is shown in Fig. 1 using the reception signal determination method described in the table below. The received base 4I threshold value S is input to the input terminal 10.
From 1, it was manually branched into three traffic lights.

One is input to the switching circuit 104, and one is input to the subtraction circuit 1.
01 manually, and one is input to the synchronization signal extraction circuit.

A synchronizing signal P, which will be described later, is supplied to the front-a separate line 103, and the eight values are converted into a constant-spaced I-sequence 88 in the III record a separate line 103, and are converted into digital data.

The digital/analog converter output is converted to an analog value S by the 7-digit converter 107K, and the output from the digital-to-analog converter is input to the 1-digit switching circuit 1O4. The synchronization signal P1, which is the output of the cocoon, 1 synchronization value extraction circuit 102, is branched into two, one of which is input to the identification circuit 103, and the other is input to the synchronization signal detection circuit 1.
Enter in 06. Output 8 of the synchronization signal detection circuit 106
c is supplied to the switching circuit 104.

Signal 8c is a control signal that controls the switching circuit.

That is, when the synchronization signal ejection circuit input P1 is a synchronization signal with a constant period, the digital signal J is generated by the signal 8c.
The i-communication means is selected and the signal Ss is output from the switching circuit. When the synchronization signal detection circuit input P1 is a signal without m-law, the analog signal receiving means is selected by the 1 control signal Sc, and the signal S1 is output from the discontinuous circuit 104.

For example, when receiving a sine wave signal such as a selective paging signal in mobile communication, and whose frequency is the same,
Al1! When the frequency is 1 (N is positive! Efi), the conventional receiving IM1. If the signal judgment method is used, the signal judgment will be incorrect.

The purpose of the present invention is to overcome the drawbacks of the λ rice method, and to determine whether the received input signal is an analog signal or a digital signal and to switch the receiving means by utilizing the characteristics of the one-cass vector amplitude distribution in the base band. An object of the present invention is to provide a received signal judgment method for automatic fishing.

The reception ID code determination method according to the present invention utilizes signal characteristics in the baseband of digital signals and analog signals. Digital 1# is @1″, @o'
It is an o pulse train, is restricted to 4 positions, and has a 'ku' cass vector component in the entire 9-group t* area.

(It didn't match Figure 82.) On the other hand, analog g! No. 1 does not necessarily have an electric cassette vector component in the entire band-limited baseband. For example, the conversation signal f.

It has an electric scum vector component between 300Hz and 3Kk1g (shown in Fig. 2B). Now 4--limited basis ll
Assuming that the range is WHg, there is no electric cassette vector component in the anada high voice signal in the diagonally shaded band S in Fig. 2A, and
Digital No. 16 IC is in full swing.

According to the above principle, the received signal is transmitted within the transmission band of base # or
When determining whether it is an analog signal with a range of 1-Plj or a digital signal, and switching the receiver 1 to a means suitable for the receiver 4s signal, the analog signal has an electric scum vector component. Detects the presence or absence of an electric scum vector component (referred to as an analog out-of-band component) in the frequency region where there is no analog band. If it can be detected, the received signal is determined to be a digital signal, and if it cannot be detected, the received signal is A received signal determination method is provided in which the received signal is determined to be a Nafugu signal and the receiving means is switched according to the result of the determination.

Hereinafter, embodiments using the received signal recognition method according to the present invention will be described in detail.

FIG. 3 shows a first embodiment of the present invention.

In this embodiment, the received base Mbin 1d signal is switched to the receiving means z and output means that distribute the received signal, and the receiving 1fi signal is manually generated. Even in the case of traffic lights, I! I can do it. The entire base band is manually input from the input terminal 301 and branched into two. One is manually input to the switching circuit 303, and the other is input to the analog external component input circuit 302.

A control signal 81! is sent from the analog out-of-band component detection circuit 302 to the 411 leftover circuit 303! enters. If the input signal f9i has a component outside the 7-digit signal band, the switching circuit is connected to the output terminal 304 for a digital signal by the control signal 8cK, so that the input signal 8i does not have a component outside the 7-channel signal band. In this case, the whine control signal 8c causes the switching circuit to switch the output terminal 30 for the anag signal.
It will be *** to 5.

FIG. 4 shows a second embodiment of the present invention.

In this embodiment, the received baseband signal passes through both the digital and 7-channel receiving means, and after passing through, the two signals after death are switched and outputted from one output terminal.
It can be used when Digital No. 18 is an encoded Akag signal.

The received signal S1 is input from the input terminal 401 and is branched into four channels, one input to the analog signal out-of-band component detection circuit 402, and one input to the input terminal Ig1.
4404 K Human power L, Hitotuba iii 1g 1m 4t
) 3, and one μ synchronization signal extraction circuit 907. The output of the synchronization signal extraction circuit 407 is input to the identification circuit 403 . The output of the analog signal out-of-band component detection circuit 402 is supplied to the switching circuit 404 as a control signal 8c. The output of the discrimination circuit 403 is input to the digital 7spg conversion 5406, and the output S1 is the switching circuit 4.
Enter in 04. If the input signal 81 has a component outside the analog signal band, the digital signal receiving means is selected by the control signal SC, and the switching circuit selects the digital signal 8. is output. If the human power generator 81b1 does not have a component outside the anag band, the anag signal receiving means is selected by the control signal 8c, and the decoration switching circuit 404 outputs the signal Slj.

In this embodiment, the switching circuit is configured before the output terminal 405, but it is also configured before the identification circuit 403Jd and the digital/analog conversion@40
A switching circuit may be provided between 6 and 6.

As described above, by using the method of the present invention, it is possible to determine whether a received signal is digital or analog using conventional methods.

Although a switching circuit was used in the above explanation, the same function can be obtained even if this circuit is configured with 1,200 switch circuits. input.

It also talks about baseband signal transmission.

If we consider that a demodulated signal is input to the input terminal, the same can be said of a system that transmits a modulated signal.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment using the conventional received signal determination and receiving means switching method. 4 are block diagrams showing an embodiment using the received signal determination and receiving means provisioning method according to the present invention. In these figures, 101, 201.31) 1 is the input terminal, 102, 407 is the synchronous TD No.
i times Q, 105.204, 205, 305 are output terminals,
106r is a mechanical synchronization determination circuit, 107, 306 is a digital-to-analog converter, and 202, 302 is a power spectrum detection path outside the voice band. 1st gall 2nd gall 3rd gall

Claims (1)

[Claims] S is a method of determining whether the received signal is an analog signal having a frequency range outside the band-limited base 4 band and having no electric charge vector component or a digital signal <1, and switching the receiving means. Yes, 5IIk! If the analog signal is detected as having one frequency vector of frequency 11I which does not have an electrical fault vector component, and if the electrical fault vector can be detected from the baseband signal of the received good signal, it is determined that the received signal is digital. If it cannot be detected, it is determined to be an analog signal, and according to the result of the determination, it is determined that it is an analog signal.
15. A method for determining an injury signal, characterized in that the signal 15 is offered to the 15 means which receives the signal d and receives a good signal.