JPH05323010A - Remote speech receiver - Google Patents

Abstract

PURPOSE:To receive speech which is transmitted from a remote part vividly at a local part near a speaker using a remote speech receiver. CONSTITUTION:The title item is provided with a level detection part 111 for receiving a national radio signal from a speaker's single frequency natural radio signal generator 101 by an antenna L106 or an antenna R107 and then measuring the distance to the speaker according to the intensity of the detected electrical signal, a distance difference detection part 110 for measuring the distance difference according to the arrival time difference between left and right natural radio signals, and a speaker position detection part 112 for determining the speaker's position according to the measured distance and the distance difference. Further. it is provided with an angle adjuster L104 for adjusting the direction of a directional microphone L102 and that of a directional microphone R103 according to the output of the speaker position detection part 112, variable delay machines L113 and R114 for outputting speech signal by correcting the arrival time difference between the left and right speech inputs near the speaker based on the time difference, and an in-phase speech extraction part 115 for taking out only the in-phase speech signal from the output audio signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice receiving device, and more particularly to a remote voice receiving device capable of locally and clearly receiving a voice near a speaker even if the speaker moves to a remote part.

[0002]

2. Description of the Related Art In recent years, two systems have been used as a receiver for receiving a remote voice. Hereinafter, two types of conventional remote voice receiving apparatuses will be described.

The first type of remote voice receiving apparatus is provided with a gain control function for increasing the gain in the case of a small voice as shown in FIG. 5, so that a speaker voice from a remote portion can be received. It is a method. In FIG. 5, 1 is a speaker, 2 is a sound source A, 3 is a sound source B, 4 is a sound source C, 5 is a sound source D, and sound sources A2, B2, C4 and D5 are sound sources other than the speaker 1. Reference numeral 6 is a microphone, 7 is a level detection unit that detects the level of voice input from the microphone 6 as an electric signal, 8 is a gain setting unit that sets a gain based on the output of the level detection unit 7, and 9 is a gain setting unit 8 The output of the microphone 6 is amplified by the variable amplifier whose gain changes according to the output of the received voice, and the received voice is output.

The operation of the first type remote voice receiving apparatus configured as described above will be described below.

When the microphone 6 is omnidirectional, the voice uttered by the speaker 1 is input to the microphone 6 together with the voice uttered by the sound source A2, the sound source B3, the sound source C4 and the sound source D5. In the case of directivity, the voice uttered by the speaker 1 is input to the microphone 6 together with the voices from the sound sources C4 and D5 before and after the speaker 1. The audio signal input to the microphone 6 is converted into an electric signal and output to the level detection unit 7 and the variable amplifier 8. The level of the input audio signal is measured by the level detecting section 7, and the output of the level detecting section 7 is input to the gain setting section 8. The gain setting unit 8 sets a small gain in the variable amplifier 9 when the output of the level detection unit 7 is large, and sets a large gain in the variable amplifier 9 when the output of the level detection unit 7 is small. As a result, speaker 1
Even if the position is at a remote part and the voice level is low, the received voice output level is kept constant.

A conventional remote voice receiving apparatus of the second method is shown in FIG. In the second type of receiver device shown in FIG. 6, the voice input portion of the receiver device is separated from the main body as a slave unit, and a voice signal of a speaker is transmitted from the slave unit to the main unit by being superimposed on a wireless carrier wave. Play the audio signal on the main unit.

In FIG. 6, 10 is a speaker, 11 is a microphone for converting the voice of the speaker into an electric signal, 12 is an amplifier for amplifying the voice signal converted into the electric signal, and 13 is a wireless carrier wave modulated with the voice signal. Modulation unit, 14 is a transmitting antenna of the slave unit, 15 is a receiving antenna of the main body, 16
Is a detector for extracting an audio signal from the modulated wireless carrier wave received by the antenna 15, 17 is an amplifier for amplifying the detected audio signal, and 18 is a slave unit.

The operation of the conventional remote voice receiving apparatus of the second system configured as described above will be described.

The speaker 14 carries a child device 18, the voice of the speaker is converted into an electric signal by the microphone 11, the voice signal converted into the electric signal is amplified by the amplifier 12, and the amplified voice signal. Is superimposed on the wireless carrier wave by the modulator 13 and transmitted from the antenna 14. The main body side receives the wireless carrier wave transmitted from the antenna 14, and the detection unit 1
At 6, an audio signal is extracted from the wireless carrier, and the audio signal is further amplified by the amplifier 17 and output as a reception voice output. According to the conventional remote voice receiving apparatus of the second method, even if the position of the speaker is remote, it is less affected by other sound sources, and remote voice receiving with clear voice is possible.

[0010]

However, in the remote voice receiving apparatus of the first system, the gain adjustment is simultaneously performed for the voices from other sound sources other than the voice of the speaker. Voices from other sound sources other than voices become noise and make the voices of the speaker difficult to hear.

Further, in the conventional remote voice receiving apparatus of the second method, it is necessary to provide the slave unit with a wireless transmission means such as an amplifier and a modulator in addition to the microphone, and the slave unit has a large circuit scale. There is a problem that power consumption becomes large and it is inconvenient to carry and cannot be used for a long time.

The present invention is intended to solve the above problems, and it is possible to receive a voice of a remote speaker as a clear voice without mixing of voices from other sound sources, which is inconvenient to carry. It is an object of the present invention to provide a remote voice receiving device which can be used for a long time without use.

[0013]

In order to achieve the above object, a remote voice receiving apparatus of the present invention transmits a unique radio signal transmitted from a unique frequency unique radio signal generator carried by a speaker. From the time difference between the level detection unit that measures the distance to the speaker by the strength of the electric signal received by the radio signal receiving antenna on either the left or right side and the time at which the unique radio signal arrives at the left and right radio signal receiving antennas A speaker position detecting unit including a distance difference detecting unit that measures a distance difference, and a speaker position detecting unit that determines a speaker position based on the distance and the distance difference measured by the level detecting unit and the distance difference detecting unit. ,
A left and right angle adjuster that adjusts the directions of the left and right directional microphones by the speaker position detecting means, and a left and right variable delay device that corrects the arrival time difference between the left and right voice inputs near the speaker based on the distance difference. , And a voice extraction means including an in-phase voice extraction unit for extracting only the in-phase voice signal from the voice signals from the left and right variable delay units.

[0014]

According to the above configuration, the distance to the speaker is measured by the intensity of the electric signal received and detected by either the left or right radio signal receiving antenna, and the unique radio signal reaches the left and right radio signal receiving antennas. At the same time as detecting the distance difference with the speaker from the time difference of, the position of the speaker is detected at the same time, the left and right directional microphones are respectively directed to the speaker, and the arrival time difference of the voice input obtained from the left and right microphones is By correcting the distance difference between the left and right microphones and the speaker with a variable delay device, and extracting only the in-phase voice by the in-phase voice extraction unit, only the voice near the speaker can be received clearly and locally. It will be possible.

[0015]

1 is a block diagram showing the configuration of an embodiment of a remote voice receiving apparatus according to the present invention.

In FIG. 1, 101 is an inherent radio signal generator carried by a speaker, 102 is a directional microphone L (hereinafter, microphone is microphone, left is L), 103 is directional microphone R (hereinafter The right is represented by R), 104 is an angle adjuster L, 10 for adjusting the azimuth of the directional microphone L102.
5 is an angle adjuster L that adjusts the azimuth of the directional microphone R 103, 106 is an L-side antenna L that receives a unique radio signal, 107 is an R-side antenna R that receives a unique radio signal, and 108 is an antenna L 106. A detection unit L for detecting the received signal, 109 is a detection unit R for detecting the signal received by the antenna R107, and 110 is a distance difference for inputting the electric signal output by the detection unit L108 and the electric signal output by the detection unit R109. A detection unit, 111 is a level detection unit for inputting the electric signal output from the detection unit L108, and 112 is a signal for inputting the outputs of the distance difference detection unit 110 and the level detection unit 111 and outputting them to the angle adjuster L104 and the angle adjuster R105. A person position detector, 113 is a directional microphone L102, and a variable delay device L that inputs the output of the distance difference detection unit 110, 114 is a directional microphone R103. Variable delays receiving an output of the distance difference detecting unit 110 R, 115 are in phase sound extracting unit that outputs the received voice output by an output of the variable delay unit L113 and the variable delay unit R114.

The operation of the remote voice receiving apparatus of the present invention constructed as above will be described below.

The speaker carries the peculiar radio signal generator 101, and the peculiar radio signal generator 101 constantly transmits the peculiar radio signal. The unique radio signals transmitted by the unique radio signal generator 101 are the antenna L106 and the antenna R10.
7 are received by the detection unit L108 and the detection unit R, respectively.
The signal is detected by 109, and an electric signal of a single frequency is obtained. Two electric signals output from the detection unit L108 and the detection unit R109 are shown in FIG. 2 due to the difference between the distance between the unique radio signal generator 101 and the antenna L106 and the distance between the unique radio signal generator 101 and the antenna R107. Like 2
A delay time φ seconds occurs between two waveforms. When the wireless carrier speed is v (m / sec), the unique wireless signal generator 101
Between the antenna and the antenna L106 and the unique radio signal generator 10
The difference Δs in the distance between 1 and the antenna R107 is given by the following equation and calculated in the distance difference detection unit 110.

Δs = v · φ (m) (1) Further, the level detection unit 111 detects the electric field strength of the unique radio signal received by the antenna L106, and the unique signal carried by the speaker is received from the antenna L106. Wireless signal generator 1
The distance s (m) to 01 is calculated, and the position of the speaker is determined by the speaker position detection unit 112 from this s (m) and the above-mentioned Δs. That is, as shown in FIG. 3, assuming that the distance between the antenna L106 and the antenna R107 is p (m), the unique radio signal generator 10 is connected to the antenna R107.
Since the distance to 1 is s + Δs (m), the antenna L
Specific radio signal generator 101 and antenna R viewed from 106
The angle θ _R (rad) between 107 and the antenna R107
Unique radio signal generator 101 and antenna L106 seen from above
The angle θ _L (rad) that sandwiches is calculated by equations (2) and (3) according to the cosine theorem of trigonometric functions.

Θ _L = COS ⁻¹ {[s ² + p ² − (s + Δs) ² ] / 2sp} (2) θ _R = COS ⁻¹ {[p ² + (s + Δs) ² −s ² ] / [2p (s + Δs)]} (3) In this way, the value of θ _L calculated by the speaker position detection unit 112 is output to the angle adjuster L104, and the value of θ _R is the angle adjuster. It is output to R105. Angle adjuster L104
Sets the azimuth of the directional microphone L102 installed at the same position as the antenna L104 to the angle θ _L , and the angle adjuster R1
Reference numeral 05 sets the azimuth of the directional microphone R103 installed at the same position as the antenna R105 to the angle θ _R. As a result, the directional microphone L102 and the directional microphone R103
FIG. 4 shows a range in which the voice can be received. As shown in FIG. 4, according to the directional microphone L102, A, C
Voices in the range represented by B and C are received, and voices in the range represented by B, C, and D are received by the directional microphone R103. The distance difference Δ shown in FIG. 3 between the audio signals in the vicinity of the range C that is received by both the directional microphone L102 and the directional microphone R103.
Since there is a time difference of φ _V (seconds) corresponding to the time to advance through s, it is necessary to perform delay correction. If φ _V is a positive value, the variable delay unit L113
_V (second) delay, and if φ _V is negative, variable delay device R
The right voice signal is delayed by φ _V (second) by 114. The outputs from the variable delay device L113 and the variable delay device R114 are input to the in-phase voice extraction unit 115. The in-phase voice extraction unit 115 extracts the in-phase voice signals, which are the left and right voice signals emitted in the vicinity of the range C, from the left and right voice signals and outputs them as the reception voice signals.

As described above, according to the remote voice receiving apparatus of the present invention, the voice of the remote part is not disturbed by the voice from the other sound source, and becomes the clear voice only in the local part near the speaker. It is possible to receive a call.

Since the unique radio signal generator 101 used in the present invention is a transmitter modulated at a single frequency and has a simple structure and can be made compact, a unique radio signal generator carried by a speaker is provided. Is small and lightweight, consumes less power,
It is convenient to carry and can be used for a long time.

[0023]

As is apparent from the above embodiments, according to the remote voice receiving apparatus of the present invention, the speaker carries the unique radio signal generator of a single frequency and transmits from the unique radio signal generator. By recognizing the position of the speaker by receiving the radio signal to be transmitted by the two antennas and pointing the two directional microphones in the direction of the speaker, even when the speaker is in a remote part, It is possible to receive clear voice only in the local area near the speaker. Further, the unique radio signal generator is small and lightweight, consumes less power, is convenient to carry, and can be used for a long time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a remote voice receiving apparatus of the present invention.

FIG. 2 is a waveform diagram of unique radio signals output from the left and right detection units.

FIG. 3 is a schematic diagram showing a positional relationship between a unique radio signal generator and left and right antennas.

FIG. 4 is a schematic diagram showing a listening range of left and right directional microphones.

FIG. 5 is a block diagram showing an example of a conventional remote voice receiving device.

FIG. 6 is a block diagram showing another example of a conventional remote voice receiving apparatus.

[Explanation of symbols]

 101 peculiar radio signal generator 102 directional microphone L (directional microphone) 103 directional microphone R (directional microphone) 104 angle adjuster L (angle adjuster) 105 angle adjuster R (angle adjuster) 106 antenna L ( Radio signal receiving antenna) 107 Antenna R (radio signal receiving antenna) 110 Distance difference detection unit 111 Level detection unit 112 Speaker position detection unit 113 Variable delay device L (variable delay device) 114 Variable delay device R (variable delay device) 115 In-phase voice extractor

Claims (1)

[Claims] 1. The strength of an electric signal obtained by detecting a radio signal by receiving a proper radio signal transmitted from a single-frequency proper radio signal generator carried by a speaker by one of the left and right radio signal receiving antennas. A level detector that measures the distance to the speaker by the distance detector, a distance difference detector that measures the distance difference from the time difference between the arrival of the unique radio signals at the left and right radio signal receiving antennas, the level detector and the distance difference detector. The speaker position detecting means comprising a speaker position detecting part for determining the speaker position based on the distance and the distance difference measured by and the speaker position detecting means for adjusting the directions of the left and right directional microphones. Left and right angle adjusters, left and right variable delay devices that correct the arrival time difference between the left and right voice inputs near the speaker based on the distance difference, and the in-phase voice signal from the voice signals from the left and right variable delay devices A remote voice receiving device configured by a voice extracting means including a common-mode voice extracting unit for extracting only the voice.