JPS6260343A - Telephone set - Google Patents

Abstract

PURPOSE:To change the level of a voice of an opposite party depending on the quantity of external noise before operation in advance by collecting the surrounding noise, storing its level in a memory and using a sound volume amplifier circuit whose amplification factor is changed depending on the value of the memory. CONSTITUTION:The external noise is collected by a sound collection microphone 1, amplified by an amplifier 2 and proper time integration is applied by an integration circuit 3. The result is converted into any binary level by a digitizing circuit 4 depending on the integration value and stored in a memory 5. An OR circuit 6 detects the state that either a bell 9 rings or a handset 10 hooks off, the operation of the circuit 4 is inhibited and the memory is not revised. Then the own large voice or the effect due to the bell tone is avoided. Further, the binary noise level is changed into an analog level and an amplifier control circuit 13 controlling the amplification factor of the amplifier circuit 12 is formed so as to change the amplification factor by an external volume 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone set, and more particularly to automatic control of the call volume of the telephone set.

[Conventional Technique 1FT] Conventionally, a volume-adjustable telephone device that adjusts the volume to a level that is easy to hear depending on the volume of the voice from the other party is well known.

[Problems to be Solved by the Invention] However, even with volume-adjustable telephones, the volume of the other party's voice is known only after hearing the first voice, and the volume is often adjusted in a hurry. Ambient noise is completely different during the day and at night, and the first voice may not be heard at all, or it may be so loud that it hurts the ears. The purpose is to control the initial volume.

[Means for Solving the Problem] Therefore, in the present invention, ambient noise is collected, its level is integrated at an appropriate period, and the integrated value is converted into several levels of digital levels, and then stored in a memory. memorize it,
By using a volume amplification circuit whose amplification degree can be changed according to the value in the memory, it is possible to change the volume of the other party's voice according to the level of external noise before use.

[Function] This ambient noise integration circuit detects the ambient noise level at an appropriate period, that is, at a period of about several seconds, divides it into 5 to 10 levels, converts it into a binary, and stores it. The memory is constantly rewritten in synchronization with the cycle of the integrating circuit. By changing the voice amplification degree from 5 to 10 levels according to this memory value, it is possible to initially set the other party's voice to a level that is just right for the surrounding noise. In particular, this type of initial control is effective for telephones that are not receiver-type telephones but use amplified telephone calls (hands-free telephone calls) because ambient noise directly enters the user's ears. In the present invention, changing the set value of the noise level is prohibited during this period so that the ringing of one's own telephone or one's own voice during a call does not affect the set level. Further, it is also possible to change the magnitude of the bell sound by changing the magnitude of the noise level setting value.

[Example] The present invention will be explained based on examples.

FIG. 1 is a block diagram of a control circuit for a telephone according to the present invention. External noise is collected by a sound collecting microphone 1, amplified by an amplifier 2, and then integrated by an integrating circuit 3 for an appropriate time. Depending on the integral value, the digitalization circuit 4 converts the signal into a binary level and stores it in the memory 5. Bell 9 detects the activation voltage from telephone line 8.
is sounded by the bell drive port 1f7. Reference numeral 10 denotes a hook detection circuit that detects a state in which the hook is up, and detects a state in which the telephone receiver is lifted up in order to make a call.

The OR circuit 6 detects whether the bell is ringing or the hook is up, and during that time, the digitizing circuit 4 is prohibited from operating and the memory is not changed.': , depending on your loud voice,
The influence of the ringing sound can be avoided, and during a call, the ambient noise level immediately before using the telephone is maintained. 1
Reference numeral 3 denotes an amplification control circuit that changes the binary noise level to an analog level and controls the amplification degree of the amplifier circuit 12, and is formed so that the amplification degree can also be changed by an external volume 15. Reference numeral 11 denotes a circuit that separates the other party's voice from the line, and usually includes a coil. 14 is
This is the speaker of the handset. In this example, the handset part and the line signal processing part, which are not directly related to the present invention, are omitted.

[Effects of the Invention] As described above, the telephone set of the present invention can initially control the volume of the other party's voice according to the ambient noise detected in advance, so it can be used for telephone calls in noisy places. Great effect.

[Brief explanation of the drawing]

FIG. 1 is a blower diagram of the control circuit of the telephone according to the present invention. 1... Noise collection microphone 3... Integral i-path 4... Digitization circuit 5... Memory 6... OR line 7... Bell drive circuit 10... Hook detection circuit 11...・Audio separation circuit 12...Amplification circuit 13...Amplification control circuit

Claims (1)

[Claims] 1) A circuit that measures ambient noise before using the phone, a memory that stores the noise level, and a voice amplification circuit that can change the amplification level so that the volume of the other party's voice can be varied according to the stored noise level. A telephone set comprising: