JPH01212168A - System for identifying voice and data - Google Patents

Abstract

PURPOSE:To realize the identification of less malfunction to a voice input or a noise input by obtaining the power value of an input signal and the power value of a carrier for data communication at every constant time and executing decision as data for data communication according to the ratio of both power values. CONSTITUTION:A signal to be inputted from a terminal 1 is inputted to a power detecting circuit 10 and a power value alpha1 is outputted from the power detecting circuit 10 at every constant time t1. On the other hand, the power value alpha1 is inputted to a power detecting circuit 11 and a power value alpha2 of a carrier signal for data communication is outputted at every constant time t1. In a ratio detecting circuit 12, a ratio alpha2/alpha1 is obtained and in a comparator 13, comparison between the output of the ratio detecting circuit 12 and a constant value beta is executed. When the output of the ratio detecting circuit is larger than the constant value beta, the decision is executed as the data for data communication and when the output of the ratio detecting circuit is smaller than the constant value beta, a result is outputted to an output terminal 2 by being identified from a voice signal. Thus, the identification of the less malfunction can be realized to the voice input or noise input.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a data terminal that is connected to the same central office line as an f-voice terminal and that performs data communication only during silent periods between voice signals. This invention relates to an identification method for identifying whether a signal is a voice signal or a signal for data communication.

(Conventional technology) Connect voice terminals and data terminals to the same station line.

Data communication that utilizes the silent time of audio signals is in practical use.

Conventionally, the voice and data identification method for this type of data terminal determines the power value of the carrier for data communication in the input signal, and only when this power value is greater than a certain value, data communication is in progress. A method was adopted in which it was determined that a voice call was in progress if the power value was smaller than a certain value.

(Problem to be Solved by the Invention) By the way, when performing one communication with the terminals that perform the above-mentioned nine data communications, especially when transmitting data from one terminal to another, due to the difference in attenuation of the transmission path between the terminals. V, the signal level of the data signal in the data receiving device was very different, and the signal reception level range was very wide from a large level to a small level. As a result, the detection level of the carrier signal during data communication becomes a small value, making it easy to malfunction when noise is input.

In addition, the audio input level varies greatly from person to person, from 0 to 4K.
In the Hz frequency range, there is a low probability that carrier signal frequency components during data communication are included, but in reality they may exist, and in that case, data may be separated from data for data communication during a voice call. was there.

The object of the present invention is to overcome the above-mentioned drawbacks.

The purpose of the present invention is to provide a method for distinguishing between voice and data, which can identify voice inputs and noise inputs with fewer malfunctions.

(Means for Solving the Problems) In order to achieve the above object, the voice and data identification system according to the present invention connects to the same central office line as a voice terminal, and performs data communication by using silent time between voice signals. In an identification method for identifying whether a signal from a partner terminal is a voice signal or a signal for data communication, there is a means for calculating the power value α1 of the input signal at regular intervals, and a means for determining the power value α1 of the input signal at regular intervals means for determining the power value α2 of the carrier, and means for comparing the power ratio α2/αl of the two with a constant value β, and when the ratio is larger than β, it is determined that data is input, and the ratio is β. If the value is smaller than that, the system is configured to determine that it is a voice input.

(Example) The present invention will be explained in more detail with reference to the following two drawings.

FIG. 1 is a block diagram showing an embodiment of the voice and data identification method according to the present invention.

This figure shows only the identification circuit according to the present invention.

The input terminal 1 includes a power detection circuit 1o that calculates a power value αl every fixed time 11, and a power detection circuit 11 that calculates a power value α2 of a carrier for data communication in an input signal every fixed time 11.
is connected.

The outputs of the power detection circuits 10 and 11 are led to a ratio detection circuit 12 which detects the ratio between the power values α1 and α2 every foot time tl. The ratio output of the ratio detection circuit 12 is input to a comparison circuit 13 for comparison with a constant value β, and the comparison result is led to an output terminal 2.

A signal inputted from the terminal l is inputted to the power detection circuit lO, and a power value α1 from the power detection circuit 10 is outputted every fixed time t1. Further, the signal inputted from the terminal 1 is inputted to the power detection circuit 11, and the power value α2 of the carrier signal for data communication is outputted from the power detection circuit 11 at fixed time intervals t1. In the ratio detection circuit 12, a ratio α2/α1 between the power value α1 and the power value α2 is determined at fixed time intervals 11, and is input to the comparison circuit 13. The comparator circuit 13 compares the output of the ratio detection circuit 12 with a constant linear β, and if the output of the ratio detection circuit is larger than the constant value β, it is determined that the data is for data communication, and the ratio detection circuit If the output is smaller than the constant value β, it is identified as an audio signal and the result is output to the output terminal 2.

(Effects of the Invention) As explained above, the present invention has the power value αl of the input signal.
and the power value α2 of the carrier for data communication are determined at regular intervals, and the data is determined to be data for data communication only when the ratio (-P-) of the power values α1 and α2 is larger than the constant value β. This configuration has the effect of making it possible to identify voice inputs and noise inputs with fewer malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a voice and data identification system according to the present invention. l...Input terminal 2...Output terminal 10...
Power detection circuit 11... Power detection circuit 12... Ratio detection circuit 13... Comparison circuit patent applicant NEC Corporation

Claims (1)

[Claims] In a data terminal that is connected to the same central office line as a voice terminal and performs data communication using the silent time between voice signals,
In an identification method for identifying whether a signal from a partner terminal is a voice signal or a signal for data communication, means for obtaining the power value α_1 of the input signal at regular intervals and a power value α_2 of the carrier for data communication in the input signal are used. and means for comparing the two power ratios α_2/α_1 with a constant value β, and when the ratio is larger than β, it is determined that it is data input, and when the ratio is smaller than β, it is determined that it is audio input. A voice and data identification method characterized by determining.