JPH0273752A - Telephone system - Google Patents

Abstract

PURPOSE:To give a prescribed sound volume at all times to a receiver independently of the sound volume condition of The opposite party by converting a signal level of a voice signal based on the result of comparison with a voice signal received through the adjustment of a reference signal. CONSTITUTION:The operator listens to a sound from a speaker 117, operates a variable resistor R1 to adjust the sound volume. A voice level detection section 112 calculates an average level of an inputted voice signal and a comparator 114 compares the reference level set in advance with an average level of the inputted voice signal and informs the result to a control section 115 via an A/D converter. When a voice level from an external line 100 is lower than the reference level, the comparator 114 outputs a voltage higher than the reference voltage. Thus, the received sound volume outputted from a speaker 117 is kept constant by the sound volume preferred by the operator at all times independently of the condition of the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone device, and particularly to a telephone device having a volume adjustment function.

[Prior Art] An example of volume adjustment of a conventional telephone will be described below with reference to FIGS. 3 to 5.

FIG. 3 is a block configuration diagram when the audio signal on the extension line connecting the main device 101 and the telephone 107 is an analog signal.
The speech network 301 includes a speech network 301 having functions such as 2-wire and 4-wire conversion via a cable 00, an amplifier 110 for amplifying received sound, a resistor R302 for adjusting amplifier gain, and a speaker 117.

With the above configuration, the level of analog audio from the main device 101 can be adjusted by changing the value of the amplifier gain adjustment resistor R302. For example, a slide resistor is used as the amplifier gain adjusting resistor R302, and the volume is adjusted by operating the slide resistor.

Further, FIG. 4 shows a case where the extension telephone 107 is a digital telephone and the signal on the extension line is a digital signal. As shown in the figure, an extension line 106 includes a PCM codec 109 that performs digital/analog conversion of the audio signal via an extension interface 108 consisting of a digital signal transmission section, an amplifier 110 that amplifies the analog signal, and a resistor R302 for adjusting the amplifier gain. , a speaker 117, and a timing section 121 having functions such as clock extraction, and an amplifier adjustment resistor R as shown in FIG.
The volume was adjusted by adjusting 302.

Furthermore, FIG. 5 shows the case of a digital telephone, similar to the case shown in FIG. That is, a composite codec 500 including a PCM codec and an amplifier whose amplifier gain can be changed by a digital value, a speaker drive unit 501, a speaker 117, functions such as clock extraction are transmitted to the extension line 106 via an extension interface 108 consisting of a digital signal transmission unit. a timing section 121 having a volume adjustment resistor R
1 (118), dividing resistor R2 (119), resistor R1 (1
18) and an A/D section 116 that converts the partial pressure value of R2 (119) from analog to digital. The volume adjustment in the example shown in FIG. 5 is performed using a resistor R1 (118).
This is done by adjusting. For example, when the slide resistor that is resistor R1 (118) is operated, the A/D section 116
, R2 are digitized and the resulting values are output to the composite codec 500. Then, the composite codec 500 outputs the digital value to the speaker driving section 501 to adjust the volume.

[Problems to be Solved by the Invention] However, in the above conventional example, the receiving volume varies depending on the difference in the other party or the outside line conditions (for example, loss due to line length, or difference in whether the network is an analog network or an ISDN network). Therefore, in order to keep the listening volume constant, it is necessary to adjust the slide volume or the like each time to suit the listener's preference, which has the drawback of being extremely cumbersome to operate.

The telephone device of the present invention has been made to solve the above-mentioned problem, and after setting the reference audio level, it is possible to always provide a constant listening volume to the receiver regardless of the volume condition of the other party. purpose.

[Means for Solving the Problems] In order to achieve the above object, a telephone device of the present invention has the following configuration. That is, in a telephone device in which the main device accommodates at least one outside line and at least two or more extensions, and includes a dedicated telephone connectable to each of the extensions, output means outputs a reference signal to the main device or the dedicated telephone. a setting means for adjusting and setting a reference signal from the output means on the extension telephone; a comparison means for comparing the reference signal from the setting means with the received audio signal; and a comparison result from the comparison means. and converting means for converting the signal level of the audio signal based on.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[Description of Apparatus (Fig. 1)] Fig. 1 is a block diagram of the telephone apparatus in this embodiment. In the same figure, 100 is NTT's analog line.
This is an external line such as a CES line, PBX extension line, or ISDN line, and is an external line interface 102 in the main device 101.
be accommodated in. 105 is an extension interface accommodating an extension telephone 107; 103 is a reference sound source such as a single tone, a voice recorded by a person, or recorded music; 104 is an outside line ink face 102 or reference sound source 1;
106 is an extension line that connects the main device 101 and the extension telephone 107, and 10 is a control unit that controls each part of the main device.

In this embodiment, the extension telephone 107 connected to the main device 101 via the extension line 106 is a digital extension telephone, and the line uses a digital signal system. Other cases will be described later.

108, which shows the internal configuration of the telephone 107, is an extension interface for transmitting signals; 109 is a PCM codec that converts digitally encoded audio into analog audio signals; and 110 is a PCM codec that performs inverse conversion. The PCM codec 109 and amplifier 110 together constitute a composite codec 121.

111 is a switch that switches between the reference level detection section 113 and the voice level detection section 112 during a call; 113 is the main device 10;
A reference level detection section 112 has a function of inputting a reference sound from a reference sound source 103 in 1 through an amplifier 110 and outputting its average level as a reference value; An audio level detection unit 114 outputs a value indicating the level, and 114 is an output value from the reference level detection unit 113 and the audio level detection unit 112.
a comparator for comparing the output values from and outputting a comparison result; 12;
0 is a timing section 11 that generates and outputs a timing signal necessary for the PCM codec 109 etc. that performs clock extraction;
Reference numeral 6 denotes an analog/digital converter (A/D), which converts an analog value obtained by dividing the output of the comparator 114 and voltage +V by variable resistor R1 (118) and resistor R2 (119) into a digital value. A control section 115 inputs the digital signal from the A/D converter 116 and outputs an amplifier gain value corresponding to the digital signal to the amplifier 110 of the composite codec 121. 117 is a speaker that outputs the audio from the amplifier 110; 122 is a comparator 114 and a volume resistor 118;
, 119.

[Setting of reference level value] Next, the procedure for setting the reference level value of the listening volume in this embodiment will be described below.

First, when the operator switches the changeover switches 111 and 122 of the telephone 107 to the reference level setting side (the above-mentioned reference level detection 113 and volume resistance 118° and 119), this switching state is transferred to the main unit l via the extension line 106.
ot will be notified.

Then, in response to this notification, the control unit 10 in the main device 101 connects the reference sound source 103 and the extension interface 105 using the time division switch 104, so that the reference sound from the reference sound source 103 is transmitted to the extension line of the telephone 107 via the extension line 106. is sent to interface 108. In addition, composite codec 1
09, and is output as sound from the speaker 117 via the amplifier 110 whose amplifier gain value is initialized to "1" in advance. At the same time, the audio output from the amplifier 110 is input to the reference level detection section 113 via the changeover switch 111. At this time, the operator
Volume resistor R that listens to the sound from 17 and adjusts the volume.
Operate 1. With this operation, the volume resistance R1 (1
18) and the voltage divided by resistor R2 (119) changes, and the A/D converter 116 inputs this changed voltage value,
It is converted into a digital value and output to the control section 115.

Then, the control unit 115 outputs an amplifier gain value corresponding to the input digital value to the amplifier 110 to adjust the volume. For example, the control unit 115 is programmed to lower the amplifier gain when the partial pressure value becomes smaller due to volume operation, and to increase the amplifier gain when the partial pressure value becomes larger. When the adjustment to the optimum receiving volume is completed, the reference level detection unit 113 calculates the average level and outputs the reference value to the comparator 114. When the setting of the reference level value is completed by an operation of 0 or more, the switching is performed. Switches 111 and 122 are switched to the calling side (the above-mentioned audio level detection 112 and comparator 114) to cancel the reference level setting mode. On the other hand, the main device 101 disconnects the reference sound source 103.

In this embodiment, the reference sound source is configured within the main device 101, but a configuration in which each extension telephone 107 has one is also possible.

[Explanation of operation] Next, the operation during a normal outside line call will be explained.

A voice signal input from an outside line 100 is converted into PCM by an outside line interface 102, and sent to an extension telephone 107 from an extension interface 105 via a time division switch 104. The audio signal then passes through the extension interface 108 of the extension telephone 107 and the composite codec 121 (PCM codec 109 and amplifier 110) to the speaker 117.
At the same time, the audio signal is also input to the audio level detection section 112. Then, the audio level detection section 1
At step 12, the average level of the input audio signal is calculated and the value is output to the comparator 114. The comparator 114 compares the previously set reference level value with the average level value of the input audio signal, and sends the result to the control unit 115 via the A/D converter.
to notify.

For example, when the audio level from the outside line 100 is lower than the reference level, the comparator 114 outputs a voltage value higher than the reference voltage. The output voltage value is digitized by the A/D converter 116 and input to the control section 115, and the control section 115 outputs an amplifier gain value corresponding to the value to the amplifier 110. As a result of this output, more amplified audio is output from the speaker 117.

As described above, there is an advantage that the listening volume output from the speaker 117 can always be maintained at a constant volume set by the operator, regardless of the conditions of the other party.

According to this embodiment, by setting the reference audio level once, the volume desired by the setting operator is always provided at a constant level regardless of the other party's conditions, such as differences in the other party's speakers, line loss, etc. This has the effect of freeing you from the hassle of having to adjust the volume knob each time you make a call.

Further, in this embodiment, the amplifier gain value is determined via the control unit 115, but it is also possible that the A/D converter 116 directly supplies the appropriate amplifier gain value to the amplifier 110 as shown in FIG. It will be done.

Furthermore, if a one-chip microcomputer with a built-in A/D converter is used in the control section 115, a configuration without the A/D converter 116 can be considered. In this case, if the processing performed by the comparator 114 is processed by a one-chip microcomputer, the configuration shown in FIG. 6 is also possible.

Furthermore, the PCM codec 109, amplifier 110, level detection 112, reference level detection 113, comparator 114, and A/D converter 11 of the telephone 107 in this embodiment
6. The control unit 115 is connected to a plurality of or one DSP (
Digital Signal Processor)
Alternatively, it also includes configuration using a dedicated LSI.

[Effects of the Invention] As explained above, after setting the reference audio level, a call can be made at a constant listening volume regardless of the volume conditions of the other party.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the telephone device according to this embodiment, FIG. 2 is a block diagram explaining another embodiment, FIG. 3 is a block diagram explaining a conventional analog system example, FIGS. FIG. 5 is a block diagram illustrating an example of a conventional technique using a digital system, and FIG. 6 is a block diagram illustrating another embodiment. In the figure, 100...external line, 101...main device, 102
...External line interface, 103...Reference sound source, 1
04... Time division switch, 105... Extension interface, 106... Extension line, 107... Extension telephone, 108... Extension interface, 109... P
CM codec, 110... Amplifier, 111... Changeover switch, 112... Audio level detection, 113...
...Reference level detection, 114...Comparator, 115...
・Control unit, 116... A/D converter, 117... Speaker, 118... Variable resistor, 119... Resistor, 1
20...timing section 121...composite codec,
122... Selector switch, 300... Transformer,
301... Speech network, 302... Variable resistor.

Claims (1)

[Scope of Claims] A telephone device in which a main device accommodates at least one outside line and at least two or more extensions, and includes a dedicated telephone connectable to each of the extensions, wherein a reference signal is sent to the main device or the dedicated telephone. an output means for outputting, a setting means for adjusting and setting a reference signal from the output means to the extension telephone, a comparison means for comparing the reference signal from the setting means and the received audio signal, and the comparison means and converting means for converting the signal level of the audio signal based on the comparison result.