JPH06181490A - Telephone exchange - Google Patents

Abstract

PURPOSE:To obtain a doorphone chime and a calling tone of a trunk line incoming tone or the like in a tone volume in response to a surrounding tone volume level by detecting a tone volume level of a surrounding environment in a home use telephone exchange to which a doorphone and a telephone set are connected so as to vary the tone volume to a proper level. CONSTITUTION:When a trunk line incoming call comes from a telephone line 2, an incoming call detection circuit 5 detects it and an incoming call signal is inputted to a CPU 6. On the other hand, a sound pressures sensor 10 senses a sound pressure level of surrounding environment and outputs it to the CPU 6 as a digital signal. The CPU 6 uses an amplification factor variable circuit 8 to amplify a call tone from a call tone generating circuit 13 to a proper level in response to the sound pressure level obtained by the sound pressure sensor 10 and the result is sounded out from a speaker 11 via a call tone transmission section 9. In this case of a doorphone 1, a visitor switches a line changeover section 4 to the position of the doorphone 1 and the basic operation similar to above is implemented and the tone volume of the doorphone chime is automatically varied with a proper level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone exchange, and more particularly to a home telephone exchange to which an intercom and a telephone are connected.

[0002]

2. Description of the Related Art In recent years, a home telephone exchange system in which an intercom and a telephone are connected to each other to make a call has become widespread and is conveniently used in ordinary homes. In a conventional telephone exchange of this type, ringing tones such as a telephone line tone of a telephone and door-to-door chime tones of a visitor are configured to be emitted at a constant volume.

However, since the surrounding acoustic environment in a normal home is generally different between daytime and nighttime, the volume of each ring is raised so that the ringing tones can be heard well even during the daytime when the ambient noise is relatively large. If set to, the volume would be too unsuitable for quiet nights, and conversely if the volume was set to a low level for nighttime, there was a fear of missed listening in the daytime.

In order to solve the above problems, these volume levels should be set high during the day and low during the night.
A telephone exchange system is equipped with a clock means for counting the time of day to determine whether it is daytime or nighttime, and automatically switches the ringing volume from the speaker of the telephone outlet according to this. The proposal is Japanese Patent Laid-Open No. 2-2322
No. 93 publication.

[0005]

However, the ambient acoustic environment in a general household is not so simple that it can be clearly divided into daytime and nighttime. For example, even in the daytime, the end sound of construction in the neighborhood is abnormally large. On the contrary, there are times when it is extremely quiet, and there are cases where you can enjoy TV and audio at a relatively high volume even at night. There was a fear that the ringing tone could not be heard when watching TV at night, etc.

The present invention has been made in view of the above conventional situation, and the ringing volume of these can be changed to an appropriate volume level according to the surrounding acoustic environment irrespective of the division of day and night. It is intended to be provided to the means.

[0007]

Therefore, according to the present invention, in a home telephone exchange to which an intercom and a telephone are connected, sound pressure sensor means for detecting the ambient environmental sound volume level, and this sensor output level. In response to the,
It is an object of the present invention to achieve the above-mentioned object by providing an automatic sound volume changing means for changing the volume of the doorphone chime sound and the local line incoming sound to an appropriate level.

[0008]

With the above-described structure of the present invention, a ringing tone such as a doorphone chime or a local line ringing tone having a volume corresponding to the ambient volume level at that time can always be obtained.

[0009]

EXAMPLES The present invention will be described below based on examples. FIG. 2 shows a schematic view of the telephone exchange, and FIG. 1 shows a block diagram of the configuration of an embodiment. (Structure) In FIG. 2, a PBX is a home telephone switchboard, and a sound pressure sensor 10 for detecting the volume level of the surrounding environment and a ring tone of a telephone line (station line) 2 or a chime produced by a visitor of a doorphone 1. A speaker 11 for transmitting sound is provided. The loudspeaker 11 automatically changes the volume of the ringing tone to an appropriate level according to the detection output level of the sound pressure sensor 10.

In FIG. 1, 1 is an intercom, 1a is an intercom line, 2 is a telephone line, 3 is a circuit for detecting the depression of the intercom 1, 4 is an intercom circuit / telephone line 1a / 2.
Switching unit, 5 is an incoming call detection circuit for the telephone line 2, and 6 is a CP
U and 7 are A / D converters for the output signal of the sound pressure sensor 10, 11
Is a speaker, 12 is a single telephone, 13 is a ringing tone forming circuit, 8 is its output volume amplification variable circuit, and 8 is a ringing tone sending section.

(Operation) In the configuration shown in FIG. 1, when there is an incoming call from the telephone line 2 through the telephone line 2, the incoming call detection circuit 5 detects it and inputs the incoming call signal to the CPU 6. On the other hand, the sound pressure sensor 10 detects the sound pressure level of the surrounding environment at this time, converts the analog signal into a digital signal by the A / D converter 7 and inputs the digital signal to the CPU 6, and the ringing tone forming circuit 13 , The ringing sound output from the speaker 11 is formed, and at this time, the CPU 6 automatically variably changes the amplification variable circuit 8 to an appropriate volume level in accordance with the magnitude of the sound pressure level obtained by the sound pressure sensor 10. The amplified ringing tone S _H or S _L (FIG. 2) having an appropriate volume level is output from the speaker 11 via the ringing tone sending unit 9.

[0012] Further, a visitor switches to the intercom 1 side, and the same basic operation as described above is performed to achieve the above object.

[0013]

As described above, according to the present invention, the volume of the ringing tone of the telephone or the intercom chime is automatically changed to an appropriate level according to the surrounding acoustic environment. The speaker output volume can be always maintained at an appropriate level.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an embodiment.

[Fig. 2] Schematic view of the telephone exchange

[Explanation of symbols]

 PBX Home telephone exchange 1 Doorphone 2 Telephone line 6 CPU 8 Volume amplification variable circuit 10 Sound pressure sensor 11 Speaker 12 Telephone

Claims (1)

[Claims] 1. A home telephone switchboard to which an intercom and a telephone are connected, a sound pressure sensor means for detecting the ambient environmental sound volume level, and a doorphone chime sound and a local line ringing sound according to the sensor output level. A telephone exchange equipped with an automatic volume changing means for changing the volume of the volume of the telephone to an appropriate level.