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DESCRIPTION OF THE PREFERRED EMBODIMENTS Specification 1, Title of the Invention In a
loudspeaker having an anti-echo loudspeaker and an electro-acoustic transducer, a reference
signal having a fixed frequency set is constantly added to the electro-acoustic exchanger drive
side An acoustic coupling degree is detected by extracting a reference signal embedded in the
acoustoelectric transducer and comparing the extracted signal with the added reference signal,
and the reception signal of the electroacoustic transducer according to the acoustic coupling
degree An anti-echo loudspeaker system, configured to create a signal equivalent to a drop-in
signal, and to cancel the drop-in signal from the acoustoelectric converter side signal.
2, the scope of claims
8. Detailed Description of the Invention The present invention relates to a loudspeaker such as a
loudspeaker, and more specifically to deterioration of speech quality due to acoustic coupling of
loudspeaker and handset and incorporation of a protection circuit and anomalous excavation by
loop loop A loudspeaker that prevents the In conventional loudspeakers, the acoustic coupling of
loudspeakers and transmitters results in a -turn loop, and various voice switches are used to
prevent abnormal oscillation. In a device using this voice switch circuit, the transmit voice signal
and the receive voice signal are compared, and if the level on the transmitter side is high, the
receiver side is fixed; if the receiver side level is high, the transmitter side is fixed The loss of the
amount is pushed in to prevent howling. As a result, pulsation may occur at the level or the talker
or talker may be cut off if the device is a loudspeaker and both are talking. In this way, the device
using the voice switch has fine control in its character. It was stopped to prevent howling. An
object of the present invention is to provide a loudspeaker system capable of preventing the
above-mentioned deterioration of speech quality and preventing abnormal oscillation in a loop
loop. In order to achieve the above object, the anti-echo system according to the present
invention is a system having an acousto-electric converter and an electro-acoustic converter,
wherein the reference EndPage: 1 having a constant frequency offset on the electro-acoustic
exchanger drive side. A signal is constantly added to extract a reference signal embedded in the
acoustoelectric converter, and the degree of acoustic coupling is detected by comparing the
extracted signal with the added reference signal, and the degree of acoustic coupling is
determined according to the degree of acoustic coupling. A signal equivalent to the lead-in signal
is generated from the reception signal of the electroacoustic transducer, and the lead-in signal is
eliminated from the acoustoelectric transducer side signal. According to the spinning
arrangement, good calls can be made and the object of the present invention is completely
achieved. Hereinafter, the present invention will be described in more detail with reference to the
drawings. FIG. 1 is a circuit diagram showing an embodiment of a loudspeaker according to the
present invention. In the figure, the signal input from the receiving terminal 7 at A # 'i receiving
ring 1 is amplified by the amplifiers 8 and 9 and output from the speaker 2 which is an
electroacoustic transducer. B is a transmitting side, and voices and the like inputted from a
microphone which is an acoustoelectric converter are transmitted from a transmitting terminal
through amplifiers 4 and 5. The signal lO is a reference signal generator that generates a signal
(such as background music) having a fixed frequency. A detector 11 extracts a reference signal
contained in the transmission signal from the transmitter side. A comparator 12 compares the
amplitude and phase of the reference signal from the reference signal generator O with the
output of the detector 11.
A delay circuit 13 delays the signal extracted from the receiving side. Reference numeral 14
denotes a tap gain adjuster which adjusts the tap output signal at the output of the comparator
12. A signal from the reference signal generating circuit 10 is always added to the receiving side,
and is output from the speaker 2 as a sound wave. This sound passes into the microphone 1
through the air 3. The signal thus embedded is extracted by the detector 11, and the amplitude
and phase are compared in the comparator 12. The tap gain adjuster 14 is controlled based on
the comparison result, the tap output signal of the delay circuit 13 is adjusted, and the signal
corresponding to the drop-in characteristic is eliminated. Although the above example describes
the case of controlling the tap gain of the delay circuit, it can also be realized by a method of
using an adaptive filter and controlling characteristics instead. The present invention constantly
controls the characteristics of output and input coupling with high accuracy. For example, by
constantly sending a reference signal such as music that is generated as a sound and not
offensive at a much lower level than the audio signal, and extracting the reference signal
embedded in the input side from other signals. , With high accuracy detection of coupling
condition. In accordance with the detection result, for example, using a tap delay circuit
(transversal filter), a signal having output and input coupling characteristics is always generated
with high accuracy, and the insertion signal is eliminated. In the conventional example in which
the loudspeaker apparatus is used for the loudspeaker telephone, the voice switch is controlled
by the conventional voice detection method to prevent howling. However, according to the
present invention, since the degree of coupling from the loudspeaker to the transmitter is always
detected to control the incorporation from the signal, natural communication is possible,
degradation of speech quality due to incorporation and loop loop. Abnormal oscillation is
4. Brief Description of the Drawings FIG. 1 is a view showing an embodiment of the antipercentage preventing apparatus according to the present invention. 1 иии A / S converter
(microphone) 2 иии Electro-acoustic converter (speaker) 3 иии Acoustic transmission space 4.5, 8.9 иии
Amplifier 6 иии Transmission terminal 7 и и и Receiving terminal 0: Reference signal generator 11:
Detector 12: Comparator 13: Delay circuit 14: Tap gain controller Patent applicant Nippon
Electric Co., Ltd. Attorney attorney? EndPage: ?
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description, jps57162592
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