JPH05292168A - Telephone set - Google Patents

Abstract

PURPOSE:To set a reception level and a side tone level properly by detecting surrounding noise so as to eliminate a noise component from a transmission signal. CONSTITUTION:A microphone 1 and a noise detection section 2 detects noise and a transmission level adjustment section 3 eliminates a noise included in a transmission signal from a handset to send a signal to a trunk line. Moreover, a reception level adjustment section 4 adjusts the reception level in matching with the noise level. In this case, when the reception level is increased and the side tone level is increased, then the side tone adjustment section 5 adjusts only the side tone level and gives an output to a handset 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device which can be used even in a place where ambient noise is large.

[0002]

2. Description of the Related Art FIG. 2 shows the configuration of a conventional telephone device. In FIG. 2, reference numeral 11 is a transmission detection unit that detects the presence or absence of a transmission signal, and controls the transmission level adjustment unit 12 and the reception level adjustment unit 13. Reference numeral 14 is a handset which is an input / output unit for transmitting and receiving signals, 15 is a hybrid unit which performs 2-line to 4-line conversion for separating a signal to a station line and a signal to a handset, and 16 is a station line This is the local line I / F unit that is the interface of the.

Next, the operation of the above conventional example will be described.
In FIG. 2, when the transmission signal is input from the transmitter / receiver 14, the transmission detection unit 11 detects the transmission signal and controls the gain of the transmission level adjusting unit 12 to be increased. And is transmitted through the station line I / F unit 16.
In addition, the received signal is transmitted from the station line I / F unit 16 and the hybrid unit 1
It is input to the reception level adjusting unit 13 via 5. At this time, when the transmission signal is detected, the gain of the reception level adjusting section 13 is lowered, that is, the side signal which the transmission signal circulates to the reception side via the hybrid section is reduced.

As described above, in the above-described conventional telephone device, the side tone can be reduced by adjusting the gain of the handset when the transmitted signal is detected. That is, in a place where ambient noise is large, the noise acts as a transmission signal,
By lowering the listening level, the sidetone is reduced and it becomes easier to talk.

[0005]

However, in the above-mentioned conventional telephone device, the side tone is reduced when the transmission signal is input, and the level of the reception signal is lowered.
There was a problem that calls had to be made alternately, and there was a feeling of switching between calls, which was annoying. Further, since the noise component is transmitted together with the transmitted signal, there is a problem that the other party of the call is hard to hear.

The present invention solves such a conventional problem, and an object of the present invention is to provide an excellent telephone device capable of making a call without problems even in a place where the ambient noise is large.

[0007]

In order to achieve the above object, the present invention comprises a noise detecting section for detecting an ambient noise component, and a transmission level adjusting section for removing the ambient noise component from a transmission signal and transmitting it. Is provided to remove the noise component from the transmitted signal. Further, a receiver level adjusting unit for adjusting the receiver level according to the level of ambient noise and a sidetone adjusting unit for lowering only the sidetone when the receiver level is raised are provided.

[0008]

Therefore, according to the present invention, by detecting the ambient noise and removing the ambient noise component contained in the transmitted signal, it is possible to transmit a signal that is easy for the other party to hear. Furthermore, by adjusting the reception level according to the ambient noise level and also adjusting the sidetone level appropriately, it is possible to make the reception easier to hear.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ambient noise detection microphone (hereinafter referred to as a microphone), which inputs detected noise to the noise detection unit 2. Reference numeral 3 is a transmission level adjusting unit for adjusting the transmission level and removing a noise component included in the transmission signal, which is controlled by the noise detecting unit 2. Reference numeral 4 denotes a reception level adjusting section, which is controlled by the noise detecting section 2 so as to adjust the reception level depending on the magnitude of ambient noise. Reference numeral 5 denotes a sidetone adjustment unit, which is controlled by the transmission level adjustment unit 3 and the noise detection unit 2 in order to keep the sidetone level constant even if the transmission level changes. Reference numeral 6 is a handset for inputting / outputting a transmission signal and a reception signal, 7 is a hybrid unit for performing 2-line to 4-line conversion, and 8 is a station line I / F for interfacing with a station line.
It is a department.

Next, the operation of the above embodiment will be described.
In the above embodiment, when ambient noise is input from the microphone 1 to the noise detection unit 2 during a call, the noise component is sent to the transmission level adjustment unit 3. The transmitting level adjusting unit 3 compares the noise component detected by the noise detecting unit 2 with the transmitting signal including the noise component input from the transmitter / receiver 6, and the difference component between these signals, that is, the transmitting signal. Send only the appropriate level. If the level of ambient noise is high, the reception level adjusting unit 4 increases the reception level.
The noise detection unit 2 controls so as to adjust the gain of.
Further, if the listening level is increased, the sidetone level also rises. Therefore, the noise detecting section 2 controls the receiving level adjusting section 4 and at the same time controls the sidetone adjusting section 5 to adjust the sidetone level. The sidetone adjustment unit 5 compares the sidephone level with the transmitted signal when the received level rises, and when the sidetone level and the level of the transmitted signal are equal, lowers the sidetone level to an appropriate level.

In this way, the transmission signal is converted into a signal having a proper level with no noise, the hybrid section 7 and the office line I.
It is sent to the central line through the / F unit 8. Conversely, the station line I / F
The received signal obtained through the section 8 and the hybrid section 7 is
It is adjusted to a level that matches the level of ambient noise and output from the handset. Therefore, when the listening level is raised, there is an advantage that the sidetone can be made easy to hear by adjusting the sidetone level.

Further, in the above-described embodiment, the sidetone is adjusted by comparing the transmitted signal with the sidetone, so that there is an effect that it is not difficult to hear the signal from the other party.

[0013]

The present invention has the following effects, as is apparent from the above-mentioned embodiments. 1. The ambient noise can be detected by the microphone and the noise detection unit, the noise component included in the transmission signal can be removed by the transmission level adjusting unit, and a high quality transmission signal can be transmitted to the other party. 2. If the ambient noise is large, the listening level adjusting unit raises the listening level, and the sidetone adjusting unit lowers the sidetone level, so that an easy listening is obtained.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a telephone device according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a conventional telephone device.

[Explanation of symbols]

 1 noise detection microphone 2 noise detection unit 3 transmission level adjustment unit 4 reception level adjustment unit 5 side tone adjustment unit 6 handset 7 hybrid unit 8 station line I / F unit

Claims (2)

[Claims] 1. A noise detector for detecting a noise component around the handset, and a difference signal generated by a difference between the voice signal obtained from the handset and the detected noise component, and the difference signal A telephone device having a transmission level adjusting unit for transmitting as a transmission signal. 2. A reception level adjusting unit for increasing the level of a reception signal received according to the detected noise component, and a sidetone for adjusting a sidetone level within a predetermined range regardless of the level of the reception signal. The telephone device according to claim 1, further comprising an adjusting unit.