JPH01252014A - System and circuit for emitting incoming tone - Google Patents

Abstract

PURPOSE:To cause an incoming tone to be larger than a surrounding noise in an external part, slightly executing ringing when the noise is small and to output the incoming tone without fail by causing the volume level of the incoming tone to be variable in proportion to the surrounding noise outside of a telephone device when an incoming signal arrives at the telephone device. CONSTITUTION:When there is incoming to a telephone line and a calling signal is sent, the signal is rectified by a diode bridge 3 and operating power is supplied to an incoming tone signal generating circuit 5 and a power source circuit 4. The incoming signal is outputted from this circuit 5 and the power, which is caused to be a constant voltage, is supplied from the circuit 4 to a noise level detecting circuit 2. Then, the control signal of a level, which corresponds to the surrounding noise level to be picked up by a microphone 1, is outputted by the operation of the circuit 2. The incoming signal to be outputted from the circuit 5 is level-adjusted by a volume switch 7, which is set in advance, and inputted to a gain variable amplifier 6. By a signal which is outputted from the circuit 2 and corresponds to the external noise, the gain of the amplifier 6 is controlled and the optimum incoming volume to correspond to the external noise is executed by an incoming volume device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ring tone emitting system and a ring tone emitting circuit for telephone devices such as telephones, relay boards of telephone exchanges, telephone faxes, and the like.

[Prior art]

Adjustment of the sound output level in the ring tone output circuit of a conventional telephone device was performed manually using a volume switch that could be switched to three levels, for example.

[Problem to be solved by the invention]

According to the conventional ringtone level adjustment method using the volume switch described above, if the volume switch is used to reduce the sound output level and the surroundings are noisy, the ringtone will not be heard, and if the volume switch is set to high If the surroundings are quiet, the ringtone will be jarring. Furthermore, in order to prevent them, I had to manually operate the volume switch every time.

The present invention aims to solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention controls the volume of the ringtone of a telephone device depending on the level of ambient noise. The ring tone signal transmission circuit includes a microphone that picks up ambient noise outside the telephone device, a noise level detection circuit that outputs a control signal corresponding to the level of the ambient noise picked up by the microphone, and the arrival of a ringing signal to the telephone line. A power supply circuit for supplying operating power to the noise level detection circuit, and a variable gain amplifier for amplifying the ring tone signal whose gain is controlled by a control signal from the noise level detection circuit are provided.

[Function] When a call is received on the telephone line, the telephone device emits a ring tone at a level controlled by the level of ambient noise.

〔Example〕

The drawing is a block diagram of an embodiment in which the present invention is implemented in a telephone set, and only shows the ring tone emitting circuit portion of the telephone set.

As shown in the drawings, the ring tone emitting circuit according to the embodiment of the present invention includes a microphone 1 for picking up ambient noise outside the telephone, and a noise level detection circuit for detecting the level of the ambient noise picked up by the microphone 1. 2, a diode bridge 3 that rectifies a calling signal (16Hz or 20Hz alternating current signal) that arrives on the telephone line, and a power supply circuit 4 that supplies operating power to the noise level detection circuit 2 when the calling signal arrives on the telephone line. The gain is controlled by a control signal outputted by a ringing tone signal generation circuit 5 which generates a ringing tone signal upon arrival of a ringing signal to the telephone line, and the noise level detection circuit 2,
A gain control type amplifier 6 that amplifies the ring tone signal from the ring tone signal generation circuit 5 using the controlled gain, and a volume switch 7 that manually adjusts the level of the ring tone signal to the amplifier 6. , and a ring tone emitter 8 that emits a ring tone based on the output signal of the amplifier 7.

Microphone 1 has wide directivity (or omnidirectional if possible) to pick up external noise around the phone over a wide range.
are required. Furthermore, if the telephone has a so-called hands-free function, a microphone provided for that function can be used. That is, since there is no talking state when a call is received, the microphone for hands-free calling may be configured to be switched and connected to the ring tone signal sending circuit side.

The noise level detection circuit 2 is composed of, for example, a preamplifier and a filter connected in series, and the noise picked up by the microphone 1 is amplified by the preamplifier and then passed through the filter to generate a control signal in the form of a DC signal with a level proportional to the noise level. Output.

The power supply circuit 4 converts the power obtained by rectifying the calling signal using the diode bridge 3 into a constant voltage, and supplies the noise level detection circuit 2 with operating power. Furthermore, if the telephone has its own local power supply, such as a so-called multi-function telephone, a switch circuit that is turned on by the output signal of the diode bridge 3 supplies operating power from the local power supply to the noise level detection circuit 2. In this case, the local power supply and switch circuit correspond to the power supply circuit 4. Furthermore, in a telephone device having a local power source, operating power may be constantly supplied to the noise level detection circuit 2 from the local power source regardless of the ringing signal.

The ringing tone signal generating circuit 5 is operated by the power generated from the ringing signal by the diode bridge 3, and oscillates and outputs a ringing tone signal. When the telephone line is a central office line, the ringing signal is sent in a manner that continues for 1 second every 2 seconds, so the ringing tone generation circuit 5 also outputs the ringing tone signal in synchronization with the cycle of the ringing signal. .

The amplifier 6 includes, for example, an electronic volume and a power amplifier, and is of a variable gain type so that the electronic volume is controlled by a control signal output from the noise level detection circuit 2.

The volume switch 7 adjusts the volume of sound emitted from the ring tone emitter 8 by connecting and disconnecting connections between a plurality of resistors using a manual switch.In this embodiment, the volume adjusted by the volume switch 7 is further controlled by ambient noise. Further, the volume switch 7 is not necessarily necessary in view of the gist of the present invention.

The ring tone emitter 8 is usually constituted by a speaker.

Next, the operation will be explained.

When a call arrives on the telephone line and a ringing signal is sent,
This ringing signal is rectified by the diode bridge 3, and operating power is supplied to the ringing tone signal generation circuit 5 and the power supply circuit 4. As a result, the ringtone signal generation circuit 5 is activated and a ringtone signal is output from the ringtone signal generation circuit 5, and the power supply circuit 4 converts the operating power into a constant voltage and supplies it to the noise level detection circuit 2. As a result, the noise level detection circuit 2 is activated, and a control signal having a level corresponding to the ambient noise level picked up by the microphone 1 is outputted from the noise level detection circuit 2.

The ringing tone signal outputted from the ringing tone signal generating circuit 5 is level-adjusted by a volume switch 7 which is manually set in advance, and then input to the amplifier 6. At this time, the gain of the amplifier 6 is controlled by the control signal from the noise level detection circuit 2 so that it becomes high when the noise level picked up by the microphone 1 is large, and becomes low when the noise level picked up by the microphone 1 is small.

Therefore, the ringtone signal input to the amplifier 6 is
The signal is amplified with the gain at that time and output from the amplifier 6. As a result, the ringtone emitter 8 emits a ringtone at a volume corresponding to the loudness of the surrounding noise.

In the above operation, the ringing tone signal generation circuit 5 takes a period of time from when a ringing signal arrives on the telephone line until the gain of the amplifier 6 is controlled by the control signal from the noise level detection circuit 2.
If the rise time of This can be achieved by, for example, inserting a time constant circuit made of a resistor and a capacitor between the dionide bridge 3 and the ring tone generation circuit 5.

Although the embodiment described above is an example in which the present invention is implemented in a telephone, the present invention can be implemented in any telephone device as long as it is necessary to audibly display an incoming call from a telephone line. it is obvious.

〔Effect of the invention〕

As is clear from the above description, the present invention is designed to vary the sound emission level of a ring tone in proportion to the ambient noise outside the telephone device when an incoming signal arrives at the telephone device. According to , when receiving a call, even if the outside of the phone is noisy, the ringtone will be louder, and if it is quiet, the ringtone will be louder, so you may miss the ringtone when the surroundings are noisy, or if the surroundings are quiet. Problems such as ringtones becoming harsh are eliminated, and the present invention has extremely great practical value.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the invention.

Claims (1)

[Claims] 1. A ring tone emitting method that detects ambient noise and controls the volume of the ring tone based on the detected level. 2. A microphone that picks up ambient noise, a noise level detection circuit that outputs a control signal corresponding to the ambient noise level picked up by this microphone, and supplying operating power to the noise level detection circuit when a calling signal arrives on the telephone line. a variable gain amplifier whose gain is controlled by a control signal from a power supply circuit, a ringtone signal generation circuit, and the noise level detection circuit, and which amplifies the ringtone signal from the ringtone signal generation circuit by the gain; A ring tone emitting circuit consisting of a ring tone emitter that sounds in response to the output signal of this amplifier.