JPS6331658U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
Figure 2 is a block diagram embodying the line connection device in the same as above, Figure 3 is an explanatory diagram of the operation of each filter used in the same, and Figure 4 shows the signals of each part indicated by the corresponding symbol in Figure 2. FIG. 1 is a transmission line, 2 is a line connection device, 3 is a converter,
4 is a call start/end detection device, 11 is a computer device, 12 is a modem, 21 is a transmitter, 22 is a band elimination filter, 23 is a speech signal generation circuit, 24 is a summing amplifier, 25 is a band filter, and 26 is a band elimination filter. 27 is a call detection circuit, and 28 is a receiver.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Selection of a data transmitting/receiving means for performing data communication, a voice transmitting/receiving means equipped with a transmitter and a receiver for performing voice communication, and one of the data transmitting/receiving means and the voice transmitting/receiving means. a converter that connects to the transmission line,
control means for switching the converter; call start detection means for detecting the start point of voice communication and transmitting call request data from the data transmitting/receiving means; and detecting the end point of voice communication and switching the converter to the data transmitting/receiving means side by the control means. When the called station's data transmitting/receiving means receives the call request data, the data transmitting/receiving means of the called station switches the converter to the voice transmitting/receiving means side and returns the call acceptance data, and the data transmitting/receiving means of the calling station receives the call request data. The means is set to switch the converter to the voice transmitting/receiving means side by the control means upon receiving the call acceptance data, and the voice transmitting/receiving means is configured to:
a speech signal generation circuit that outputs a speech signal within a predetermined frequency bandwidth; a first band elimination filter that removes a frequency component corresponding to the speech signal from the output of the transmitter; An addition circuit that adds the output of the cancellation filter to produce a transmission signal, a call detection circuit that detects a call signal from the other station included in the received signal, and a call detection circuit that detects the frequency component of the received signal that corresponds to the call signal from the other station. and a second band elimination filter that removes the signal and outputs it to the receiver, and the converter is set to the voice transmitting/receiving means side by the control means while the call signal is detected by the call detection circuit. Communication switching device. (2) The speech signal outputted from the speech signal generation circuit is a signal of a single frequency, and the calling station and the called station are set to different frequencies.Claim 1 of Claims for Utility Model Registration Data communication and
Voice communication switching device. (3) The data communication/voice communication switching device according to claim 1, wherein the speech signal output from the speech signal generation circuit is converted into a modulated signal.