JPH0435144A - Telephone system - Google Patents

Abstract

PURPOSE:To attain talking with a proper reception tone volume by providing each means controlling a reception tone volume of a telephone set in response to a tone volume of a caller automatically and listening to a voice of an opposite party in a received tone volume in response to the state. CONSTITUTION:A gain of a variable gain amplifier 5 of a transmission circuit is varied by a variable resistor 6 in response to the state, a control section 2 uses a rectifier circuit 7 to rectify an AC signal from the amplifier 5 into a DC signal and the DC signal is inputted to a voltage comparator 8. The communication 8 compares an input DC level with a reference level and gives the result of comparison to a control voltage generating circuit 9. The circuit 9 converts the result of comparison to a proper control voltage (a), which is a voltage in response to the transmission tone volume and a reception circuit 3 inputs the voltage (a) outputted from the circuit 9 to a variable gain amplifier 10, and a received call tone volume from a line is outputted in voice by a receiver 11 in a level in response to the transmission tone volume. Thus, the talking is attained by a reception tone volume in matching with the state.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to telephones.

[Prior art] Telephones have been known in the past that manually adjust the listening volume during a call, but they are not structured to allow frequent adjustment, so the call volume generally remains almost constant regardless of the surrounding situation. is often kept.

[Problems to be Solved by the Invention] Therefore, in the above conventional example, for example, when the surrounding noise is very loud, it is difficult to hear a telephone conversation, and on the other hand, once the volume is set high, the surrounding noise becomes difficult to hear. This system has drawbacks such as the volume of the receiver being too loud even in quiet conditions.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone that can appropriately adjust the listening volume without requiring any operation by the caller.

[Means for Solving the Problems] The present invention is characterized in that it has a detection means for detecting the transmitting sound volume, and an adjusting means for adjusting the receiving sound volume according to the output value of the detecting means. , a first adjusting means for adjusting the transmitting sound volume according to the user, a detecting means for detecting the transmitting sound volume of the first adjusting means, and a second adjusting means for adjusting the receiving sound volume based on the output value of the detecting means. It is characterized by having the following.

[Function] According to the present invention, by automatically controlling the listening volume of the telephone according to the volume of the transmitter, it is possible to hear the other party's voice at a listening volume that is appropriate for the situation. That is, when the surroundings are noisy on the transmitting side, the voice of the transmitter naturally becomes louder, so by controlling the receiving volume according to this volume, an appropriate receiving volume can be obtained.

[Embodiment] FIG. 1 is a block diagram showing an automatic listening volume adjustment circuit in a telephone according to a first embodiment of the present invention.

The device of this embodiment includes a transmitting circuit 1 for inputting voice, a receiving circuit 3 for outputting voice, and a control section 2 for controlling the gain of the sound I% signal from the line.

The transmitter circuit 1 includes a transmitter 4 that converts audio signals into electrical signals.
and a variable gain amplifier 5 that adjusts the gain of the electrical signal from the transmitter 4. The gain of the variable gain amplifier 5 can be changed by a variable resistor 6 depending on the user's situation.

The control unit 2 converts the AC signal from the variable gain amplifier 5 into a DC potential using the rectifier circuit 7 and inputs it to the voltage converter 8 . The voltage converter 8 compares the input DC potential with a reference potential, and if it is larger than the reference potential, for example, it is set to "1";
If it is smaller, the comparison result of "0" is input to the control pressure generation circuit 9 using a CR circuit or the like. The control pressure generation circuit 9 converts the above comparison result into an appropriate control voltage a and outputs it. Therefore, this control voltage a becomes a voltage corresponding to the transmitted voice volume.

The receiving circuit 3 inputs a control voltage a corresponding to the transmitting volume output from the control voltage generating circuit 9 to the variable gain amplifier lO, and inputs the receiving volume from the line to the receiver 11 at a level corresponding to the transmitting volume. Then, the receiver 11 outputs it as voice.

The variable gain amplifier 5 in the transmitting circuit 2 can be adjusted to accommodate various situations and individual differences in the hearing ability of each user by allowing the level to be changed manually.

FIG. 2 is a block diagram showing an automatic listening volume adjustment circuit according to a second embodiment of the present invention.

The device of this embodiment is composed of a transmitter circuit 21 that inputs audio, a receiver circuit 23 that outputs a signal from a line as audio, and a control section 22 that controls the gain of the audio volume.

The transmitter circuit 21 includes a transmitter 24 that converts voice into an electrical signal.
, a variable gain amplifier 25 that adjusts the gain of the electrical signal output from the transmitter 24, and an A/R converter that converts the analog signal output from the variable gain amplifier 25 into a digital signal.
It has a D converter 26. The A/D converter 26, for example, samples an analog signal, converts it into a PWM signal, and converts it into a PCM signal by encoding.

The control unit 22 includes a CPU 29, a ROM 30 that stores a program for detecting a transmission level based on a reception signal level from a line and controlling the reception level, and a work area for executing the program stored in the ROM 30. It consists of RAM 31 etc. used as a control unit 2.
The control signal a' output from the receiver 28 controls the level of the audio signal sent from the receiver 28.

The receiver circuit 23 is comprised of a variable gain amplifier 27 whose gain is changed in response to a control signal a', and a receiver 28 which converts the signal amplified through the variable gain amplifier 27 into voice.

Note that by making it possible to manually change the gain of the variable gain amplifier 25 in the transmitter circuit 21 using the variable resistor 32, it is possible to accommodate various situations and individual differences in hearing ability.

FIG. 3 is a flowchart illustrating the operation of the control section 22 according to the second embodiment.

When a call is started, audio is input to the transmitting circuit 21,
This is converted into an electrical signal and passed through the variable gain amplifier 25 and A/D converter 26.
), compare with arbitrarily set setting value (S2 to S4)
. Then, a listening volume level corresponding to each set value is set (35 to S8).

In addition, the user listens to the receiving volume and determines whether it is appropriate, and if it is inappropriate (39), adjusts the variable gain amplifier 25 and resets the transmitting volume level (S10).
Set the listening volume to an appropriate level.

The variable gain amplifier 25 in the transmitting circuit 21 is not necessary as long as the program allows the control unit 22 to freely change any set value.

FIG. 4 is a block diagram showing a listening volume adjustment circuit in a digital telephone according to a third embodiment of the present invention.

This embodiment device includes a transmitter circuit 4 that converts voice into an electrical signal.
1, a receiver circuit 43 that converts the receiver signal from the line into an audio signal, and a control section 42 that controls the receiver volume level.

The internal configurations of the transmitting circuit 41 and the control section 42 are the same as those in the second embodiment.

The receiving circuit 43 includes a D/A converter 47 that converts a digital signal from the line into an analog signal, and a variable gain amplifier that changes the level of the converted analog signal in accordance with a control signal a'' from the control unit 42. 48, and a receiver 49 that outputs the amplified analog signal as audio.

Note that the control by the control unit 42 is the same as in the second embodiment.

[Effects of the Invention] According to the present invention, it is possible to automatically adjust the receiving volume based on the transmitting volume, and to conduct a telephone call at a receiving volume suitable for the situation.

Furthermore, if the user is allowed to freely select the amplification factor of the transmission volume, it is possible to accommodate various situations and individual differences in the hearing ability of each user.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an automatic listening volume adjustment circuit in a first embodiment of the present invention. FIG. 2 is a block diagram showing an automatic listening volume adjustment circuit according to a second embodiment of the present invention. FIG. 3 is a flowchart illustrating the operation of the control section according to the second embodiment. FIG. 4 is a block diagram showing a reception volume adjustment circuit according to a third embodiment of the present invention. 1.21.41...Talking circuit, l, 22.42...Control unit, 3.23.43...Talking circuit, 4.24.44...Talking device, 5.25.45 ...Variable gain amplifier, 6.32...
Variable resistor, 7... Rectifier circuit, 8... Voltage comparator, 9... Control voltage generation circuit, 11.28.49... Telephone receiver, 26.46... A/D converter, 47 ...D/A converter. Patent applicant Canon Co., Ltd. Agent Arata Yokubo

Claims (2)

[Claims] (1) A telephone set comprising: a detecting means for detecting a transmitting sound volume; and an adjusting means for adjusting a receiving sound volume according to an output value of the detecting means. (2) A first adjusting means for adjusting the transmitting sound volume according to the user; a detecting means for detecting the transmitting sound volume of the first adjusting means; and a second adjusting means for adjusting the receiving sound volume based on the output value of the detecting means. A telephone characterized in that it has: an adjustment means;