JP2006352639A - Voice signal acquisition apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record voices with high quality without affecting a speech and to record voices even using a telephone set body and a handset of different microphone polarities. <P>SOLUTION: The present invention relates to a voice signal acquisition apparatus to be used for branching a signal from a signal line connecting a telephone set body 11 and a handset (or headset) 12 and for recording a speech using a recorder 22, and the voice signal acquisition apparatus includes a polarity switcher 33 capable of inverting a polarity of a microphone of the handset 12 with respect to a transmission signal line 17 and a high-impedance pickup circuit 32 with an amplifier for extracting signals on reception/transmission signal lines 16, 17. An acquired signal can be prevented from being deteriorated by impedance mismatch between the pickup circuit and the amplifier, differently from a conventional apparatus employing an external amplifier. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an audio signal acquisition apparatus used for recording a call with a recorder by branching a signal from a signal line connecting a telephone body and a handset or a headset.

  FIG. 4 shows an example of the functional configuration of a conventional apparatus for recording a telephone call on a telephone. An audio signal acquisition apparatus 13 is connected between the telephone main body 11 and the handset 12. The received signal passes from the telephone main body 11 through the connector 14 to the connector 15 through the inside of the audio signal acquisition device 13 and then flows to the handset 12 through the connector 15. The transmission signal flows in the reverse direction from the handset 12 to the telephone body 11 through the connector 15, the inside of the audio signal acquisition device 13, and the connector 14. In FIG. 4, 16 indicates a reception signal line, and 17 indicates a transmission signal line.

The audio signal acquisition device 13 branches the signal from the reception signal line 16 and the transmission signal line 17 through the pickup circuit 18, and the branched signal passes through the connector 19 and passes through an external amplifier 21 to be recorded. Thus, the call can be recorded by the recorder 22 (see, for example, Patent Document 1).
JP 60-223370 A

  As described above, since the conventional audio signal acquisition device 13 uses the external amplifier 21, the impedance including the pickup circuit 18 and the amplifier 21 is unknown, and depending on the impedance of the amplifier 21, the audio signal acquisition device. 13 may affect the signal on the signal line between the telephone body 11 and the handset 12, such as noise and power level fluctuations, and may interfere with the call, thereby recording voice with high quality. In other words, there is a problem that it is difficult to record high-quality audio without being affected by peripheral devices and without causing trouble in normal calls.

In addition, when the microphone of the handset 12 to be used and the polarity of the telephone body 11 are different, there is a problem that sound cannot be picked up by the microphone. In this case as well, the call is hindered.
In view of such problems, the object of the present invention is to make a telephone main body that is less susceptible to peripheral devices, can record voices with high quality without affecting the telephone call, and has different microphone polarities. And providing a voice signal acquisition device that can record voice even with a handset.

  According to the first aspect of the present invention, there is provided an audio signal acquisition device used for recording a call with a recorder by branching a signal from a signal line connecting a telephone body and a handset or a headset. Alternatively, a polarity switch capable of inverting the polarity of the microphone of the headset is provided, and a high impedance pickup circuit with an amplifier for taking out a signal on the signal line is provided.

  According to the second aspect of the present invention, there is provided an audio signal acquisition device used for recording a call with a recorder by branching a signal from a signal line connecting a telephone body and a handset or a headset. Or, it has a polarity switch that can reverse the polarity of the microphone of the headset, and has a high impedance pickup circuit with two amplifiers for separately taking out the transmission signal and the reception signal from the signal line. The

  According to the invention of claim 3, the voice signal used for recording the call with the recording device by branching the transmission signal and the reception signal from the transmission signal line and the reception signal line connecting the telephone body and the handset or the headset. The acquisition device has a polarity switch capable of inverting the polarity of the microphone of the handset or headset with respect to the transmission signal line, and extracts the transmission signal and the reception signal from the transmission signal line and the reception signal line, respectively. Having a high impedance pickup circuit with two amplifiers, having a transformer interposed in the reception signal line, and having a transformer switch interposed in the transmission signal line, the transformer switch taking out the transmission signal Detecting whether the high-impedance pickup circuit with amplifier is normal or not, and the transmission that was connected via the transformer when it was detected that it was not normal Line a is assumed to have a function of switching the binding by connection.

In the present invention, an amplifier with a known impedance is incorporated, and a high-impedance pickup circuit including the amplifier is configured to extract an audio signal. The quality is maintained and the listener can make the speaker unaware of the presence of the audio signal acquisition device and prevent deterioration of the acquired signal due to impedance mismatch between the conventional pickup circuit and the external amplifier. It is possible to record voice with high quality.
In addition, since a polarity switch that can reverse the polarity of the microphone is provided, the voice can be recorded even with the telephone body and the handset in which the polarity of the microphone is different.

Furthermore, by incorporating an amplifier, it is possible to adjust the gain, and it is possible to adjust according to the noise level of the recording device.
Since the voice signal acquisition device according to the present invention can record voice with high quality, when a voice recognition system, for example, is used instead of the recording device at the rear stage of the voice signal acquisition device, a desired one suitable for voice recognition is obtained. Since an audio signal with a high S / N can be obtained at the level of, the accuracy of speech recognition can be improved.
Since basic equipment is incorporated into one device, it is possible to reduce the space required to install the entire call recording system including the audio signal acquisition device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
In Embodiment 1 of the present invention, it is assumed that a signal is branched from a signal line between a telephone body and a handset through a high impedance circuit with an amplifier, and the branched signal is input to a recorder to perform recording. Furthermore, it is assumed that the polarity of the microphone of the handset can be reversed by the polarity switcher.
A functional configuration example of an embodiment of the invention according to claim 1 is shown in FIG. Note that portions corresponding to those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

In the present embodiment, the audio signal acquisition device 31 has a high impedance pickup circuit 32 with an amplifier, and branches the reception signal and transmission signal from the reception signal line 16 and the transmission signal line 17 through the high impedance pickup circuit 32 with amplifier. To be taken out. The received reception signal and transmission signal are input to the external recording device 22 via the connector 19, so that the recording can be recorded by the recording device 22.
The transmission signal line 17 is provided with a polarity switch 33. With respect to the transmission signal, the polarity of the microphone of the handset 12 can be reversed by the polarity switch 33.

  According to this embodiment, unlike the conventional case where an external amplifier is used, the impedance of the amplifier is known, that is, the impedance mismatch between the conventional pickup circuit and the external amplifier does not occur. The voice can be acquired with high quality without any influence. In addition, even if the polarity of the microphone is reversed, it is possible to cope with it, and it is possible to acquire sound regardless of the polarity of the microphone. Further, in the high impedance pickup circuit 32 with the amplifier, if a transformer is sandwiched between the connection from the audio signal acquisition device 31 to the recorder 22, noise superimposed via the telephone body 11 and the audio signal acquisition device 31. Can be suppressed. In FIG. 1, reference numeral 34 denotes a power supply device for supplying power to the high impedance pickup circuit 32 with an amplifier. The power supply device 34 is, for example, a battery or an AC adapter. Even when the power supply from the power supply 34 is turned off, the connection between the telephone body 11 and the handset 12 is maintained, so that the call is not hindered.

[Embodiment 2]
In Embodiment 2 of the present invention, the transmission signal and the reception signal are taken out by one high impedance pickup circuit with amplifier in Embodiment 1, whereas two high impedance pickup circuits with amplifier are provided, The received signal is branched and taken out through a separate high-impedance pickup circuit with an amplifier.

A functional configuration example of the embodiment of the invention according to claim 2 is shown in FIG.
In the present embodiment, the audio signal acquisition device 41 has two high impedance pickup circuits 42 and 43 with amplifiers, branches and takes out the reception signal from the reception signal line 16 through one high impedance pickup circuit 42 with amplifier, and the other. The transmission signal is branched and extracted from the transmission signal line 17 through the high impedance pickup circuit 43 with an amplifier. The received signal and the transmitted signal separately taken out by these two high impedance pickup circuits with amplifiers 42 and 43 are inputted to the external recorder 22 through the connector 19 and can be recorded by the recorder 22. .

  According to the present embodiment, since the received signal and the transmitted signal are obtained separately, for example, even when there is an audio signal only on the transmitting side, it is affected by the background noise on the receiving side, or When there is a voice signal only on the side, there is no influence of the background noise on the transmission side, so that noise is less mixed and higher quality voice can be recorded. In particular, when the speech signal acquisition apparatus 41 is used in a speech recognition system, signals for transmission and reception can be recognized, so that the signal on the transmission side can be recognized as a handset characteristic (for example, the frequency characteristic or frequency band of the handset, If the speaker is fixed, a speech model that matches the speaker characteristics and gender dependence) is used for recognition processing, or the signal on the receiver side is matched to the telephone line characteristics (for example, the frequency characteristics and frequency band of the telephone line). High recognition performance can be obtained by using a speech model for recognition processing.

[Embodiment 3]
In the third embodiment of the present invention, in addition to the second embodiment, a hum noise close to a direct current from a power source or the like is suppressed by passing a transformer (transformer) in a signal line between the telephone body and the handset. When a handset microphone that requires power supply is used, power is supplied to the microphone through a high impedance pickup circuit with an amplifier. Normally, recording is possible with a recorder through a high impedance pickup circuit with an amplifier. However, for example, when a high impedance pickup circuit with an amplifier is broken, power is not supplied to the microphone, which hinders a call. Therefore, in this embodiment, it is detected whether the high-impedance pickup circuit with an amplifier is operating normally, and control is performed to switch between sandwiching the transformer and returning to normal connection. Make calls possible even if the circuit breaks.

A functional configuration example of the embodiment of the invention according to claim 3 is shown in FIG.
In the present embodiment, the audio signal acquisition device 51 includes a transformer 52 and a transformer switch 53. The transformer 52 is interposed in the reception signal line 16, and the transformer switch 53 is interposed in the transmission signal line 17. The received signal flows from the telephone body 11 through the connector 14 to the handset 12 through the transformer 52 and the connector 15. The transmission signal flows from the handset 12 in the reverse direction through the connector 15 and the polarity switch 33 and from the transformer switch 53 through the connector 14 to the telephone body 11.

As in the second embodiment, the received signal and the transmitted signal are taken out through separate high impedance pickup circuits 42 and 43 with an amplifier, and can be recorded by the external recorder 22 through the connector 19.
The transformer switch 53 includes a transformer, and can switch the transmission signal line 17 through a transformer or by a connection such as a relay circuit without using a transformer. And a means for detecting whether or not the high impedance pickup circuit 43 with an amplifier for picking up the transmission signal is normal, and connecting the transmission signal line 17 connected through the transformer when it is detected that it is not normal Switch to join by.

  In the present embodiment, since the signal flowing from the telephone body 11 is terminated by the transformer 52 and the transformer switch 53 normally, the telephone body system and the voice signal acquisition device 51 can be separated, and the voice signal acquisition is performed. The high impedance pickup circuit 43 with a built-in amplifier directly feeds power to the microphone of the handset 12 and applies gain, so that high power level sound can be obtained, and there is little influence of background noise and high quality sound recording. Is possible.

  Even if the high-impedance pickup circuit 43 with an amplifier built in the audio signal acquisition device is broken or the power supply device 34 is broken, the high-impedance pickup circuit 43 with an amplifier does not operate normally. The transformer switch 53 detects the abnormality and returns the place where the transmission signal line 17 is connected with the transformer to the normal connection, so that power is supplied from the telephone body 11 to the microphone of the handset 12 as usual. As a result, there is no situation in which a telephone call (transmission) cannot be made, and a normal telephone call is not hindered.

  In each of the above embodiments, the audio signal acquisition device is connected between the telephone body and the handset. However, a headset may be used instead of the handset.

The block diagram which shows the function structural example of embodiment of the invention which concerns on Claim 1. FIG. The block diagram which shows the function structural example of embodiment of the invention which concerns on Claim 2. A block diagram showing an example of functional composition of an embodiment of an invention concerning Claim 3. The block diagram which shows the function structure of the conventional audio | voice signal acquisition apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Telephone main body 12 Handset 22 Recorder 31, 41, 51 Audio signal acquisition device 32, 42, 43 High impedance pickup circuit with amplifier 33 Polarity switch 53 Transformer switch

Claims (3)

An audio signal acquisition device used for recording a call with a recorder by branching a signal from a signal line connecting a telephone body and a handset or a headset,
A polarity switch capable of inverting the polarity of the microphone of the handset or headset with respect to the signal line;
An audio signal acquisition apparatus comprising a high impedance pickup circuit with an amplifier for taking out a signal on the signal line. An audio signal acquisition device used for recording a call with a recorder by branching a signal from a signal line connecting a telephone body and a handset or a headset,
A polarity switch capable of inverting the polarity of the microphone of the handset or headset with respect to the signal line;
An audio signal acquisition apparatus comprising: a high-impedance pickup circuit with two amplifiers for separately taking out a transmission signal and a reception signal from the signal line. A voice signal acquisition device used to record a call with a recorder by branching a transmission signal and a reception signal from a transmission signal line and a reception signal line connecting a telephone body and a handset or a headset,
A polarity switch capable of inverting the polarity of the microphone of the handset or headset with respect to the transmission signal line;
A high-impedance pickup circuit with two amplifiers for extracting a transmission signal and a reception signal from the transmission signal line and the reception signal line, respectively;
Having a transformer interposed in the reception signal line,
Having a transformer switch interposed in the transmission signal line,
The transformer switch detects whether the high-impedance pickup circuit with an amplifier that extracts the transmission signal is normal, and connects the transmission signal line connected through the transformer when it is not normal An audio signal acquisition apparatus having a function of switching to

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