JPH07226701A - Remote mixing device - Google Patents

Abstract

PURPOSE:To attain mixing signals of lots of sound resources located remotely to each other by multiplexing sound signals, an audio level control signal and an amplifier drive power supply voltage on a signal balanced transmission line. CONSTITUTION:Serial control data (sound level control information) 3S are given to a multiplexer/demultiplexer section 4, from which the resulting data are sent to a balanced cable 5. A multiplexer/demultiplexer section 6 of a controlled side extracts the data 3S and gives the data to a serial/parallel converter 7, which converts the data 3S into digital data for each channel and a D/A converter 8 converts the digital data into an analog voltage. Then the analog voltage is given to a mixer VCA 9 to control sound level. Finally the VCA 9 controls the sound volume of each microphone MIC and extracts a mixing sound signal 9S. The signal 9S is sent to the balanced cable 5 via the multiplexer/demultiplexer section 6, and the signal 9S is demultiplexer by the multiplexer/demultiplexer section 4 to provide an output of the signal 9S. Thus, a sound level is managed by the cable 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention operates a remote fader or the like placed on the control side to remotely control a mixing amplifier or the like placed on the controlled side, and at the same time, if necessary, to the controlled side. The present invention relates to a remote mixing device that simultaneously supplies power to the device.

[0002]

2. Description of the Related Art Conventionally, in this type of remote mixing apparatus, a voice signal and a voice level control are performed in order to connect a control side on which a remote fader is placed and a controlled side on which a microphone and a mixing amplifier are placed. It was necessary to lay separate transmission lines for supplying signals and power respectively.

[0003]

However, when mixing resources (microphones) located away from the control side, the number of cables corresponding to the resources must be drawn into the mixing room of the relay vehicle or the like. It was complicated.

Also, in the remote mixing device itself, in addition to the signal lines for the audio signal and the audio level control signal, a total of three cables are required for power supply.

Therefore, the first object of the present invention is, in view of the conventional mixing technique requiring a large amount of laying cables,
An object of the present invention is to provide a remote mixing device capable of controlling the audio level with two parallel cables.

A second object of the present invention is to provide a remote mixing device capable of supplying power together with transmission / reception of audio level control information and audio signal through a single balanced cable. It is in.

[0007]

In order to achieve such an object, the present invention is a remote mixing apparatus for controlling audio signals obtained from a plurality of microphones via a single balanced transmission line. A plurality of channels of audio level control information designated by the side are converted into serial digital data, and the data are sent to the two lines of the balanced transmission line in phase with the first coupling means and the balanced transmission line. Second combining means for extracting the audio level control information from the signal received on the controlled side, and an audio signal mixed based on the audio level control information extracted by the second combining means. From the first transformer which inputs and sends out in opposite phase on the two lines of the balanced transmission line, and the signal received on the control side via the balanced transmission line,
A second transformer for canceling the signal component of the voice level control information to extract the voice signal, and transmitting and receiving the voice level control information and the voice signal via a single balanced transmission line Is.

[0008]

According to the above configuration of the present invention, when the mixing amplifier in a remote place is remotely controlled, the audio signal, the audio level control signal and the power source voltage for driving the amplifier are multiplexed on a single balanced transmission line. , It becomes possible to mix a large number of voice resources at remote locations via a single balanced cable.

[0009]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 is a block diagram showing a remote mixing apparatus according to an embodiment of the present invention.

In FIG. 1, the control side and the controlled side are connected via a balanced transmission line 5. Here, on the control side, the remote fader 1, the A / D converter 2, the parallel / serial converter 3, and the multiplexer / demultiplexer 4 (the control data 3S are multiplexed on the balanced transmission path to separate the audio signal 9S). Is included. The balanced transmission line 5 is composed of one balanced cable (shielded two-wire cable). On the controlled side, the multiplexer / demultiplexer 6 (multiplexes the mixed audio signal 9S on the balanced transmission line to separate the control data 3S), the serial / parallel converter 7, the D / A converter 8, and the VCA of the mixer.
(Voltage control amplifier) 9, a plurality of microphones MIC are included.

The above-mentioned transmission line (one balanced cable) 5
And the demultiplexing / demultiplexing units 4 and 6 connected to both ends thereof, as shown in FIG.
Buffer amplifier AMP and transformer with intermediate tap 6
0, a buffer amplifier AMP ′, and a waveform shaping section 62.

First, the overall operation of this embodiment will be described with reference to FIG.

On the control side, first, a DC voltage (audio level control information) corresponding to the position of the remote fader 1 of each channel is obtained and sent to the A / D converter 2. A /
The D converter 2 converts the analog voltage of each channel into digital data.

Digital data of each channel obtained from the A / D converter 2 is input to the parallel / serial converter 3 and converted into serial control data (voice level control information) 3S. Next, the serial control data (voice level control information) 3S thus obtained is sent to the balanced transmission line (cable) 5 via the multiplexing / demultiplexing unit 4.

On the controlled side, the serial control data 3S is extracted via the multiplexer / demultiplexer 6, input to the serial / parallel converter 7 in the next stage, and converted into digital data for each channel. , This digital data is D /
The A converter 8 converts the analog voltage. Then, the audio level is controlled by the analog voltage with respect to the VCA 9 of the mixer.

Finally, the volume of each microphone MIC is controlled by the VCA 9 and the mixed voice signal 9S is taken out.

The mixing voice signal 9S thus obtained is sent to the balanced transmission line (cable) 5 via the multiplexer / demultiplexer 6. Then, the multiplexing / demultiplexing unit 4 on the control side
Thus, the audio signal 9S is separated and output.

Next, referring to FIG. 2, regarding the multiplexing / demultiplexing processing of the serial control data 3S and the audio signal 9S,
This will be specifically described.

First, in order to send the serial control data 3S from the control side, the serial control data 3S is superimposed on the two lines 5A and 5B included in the balanced transmission line 5 in phase. Actually, the in-phase data signal is directly supplied onto the lines 5A and 5B via the buffer amplifier AMP and the balance resistors R1 and R2. That is, the serial data is transmitted to the two lines of the balanced transmission line 5 without passing through the transformer 40 on the control side.

On the other hand, the mixed audio signal 9 from the controlled side.
In order to send S, the line 5A of the balanced transmission line 5 is passed through the transformer 60 having a grounding intermediate tap in the primary winding,
The audio signal 9S is supplied to 5B. Therefore, the transformer 6
The audio signals generated on the lines 5A and 5B connected to the secondary winding side of 0 have an opposite phase relationship to each other.

The transformer 40 provided on the control side has a grounding intermediate tap like the transformer 50 provided on the controlled side (however, a coil with an intermediate tap is secondarily wound). Since it is used as a line), the audio signal transmitted on the lines 5A and 5B in the opposite phase is reproduced as the original audio signal 9S. But,
Since the serial control data 3S superimposed on the lines 5A and 5B are in phase, the in-phase component removing action of the transformer 40 does not affect the secondary side output.

Next, paying attention to the lines 5A and 5B on the controlled side, since the audio signals 9S are in opposite phase to each other, they are canceled at the input end of the buffer amplifier AMP 'to become a zero input, and serial. Only the control data 3S is applied. The output of the buffer amplifier AMP 'is pulse shaped by the waveform shaping section 62, and the serial control data 3S sent from the control side is reproduced.

The digital parallel data obtained from the fader of each channel is converted into serial data, and after the data header (FFH), No. No. 1 fader value (00H to FEH). Fader value of 2, N
o. No. 3 fader value. And the fader value of 4 are sequentially transmitted on the transmission path.

On the receiving side, the data header (FF
H) is detected, the data of each subsequent fader is
/ A converter 8 converts the voltage into VCA of each channel
Add to.

As described above, the VCA controls the audio level according to the information of the remote fader.

FIG. 3 shows another embodiment of the present invention.
In the illustrated embodiment, a DC power source is directly connected to the line 5A of the balanced transmission line 5 in order to supply power to the controlled side. With respect to the serial control data 3S and the mixing audio signal 9S, a DC voltage is cut by inserting a capacitor C at the entrance and exit of the control side and the controlled side so as not to affect the transmission signal.

The two embodiments described above provide the particular advantages listed below.

1) Since only one microphone cable is required for the control line and the main line, the cable setting work is reduced.

2) The number of control devices and controlled devices can be one-to-many instead of one-to-one, so that the scale can be easily expanded.

3) Since the data transmission is serial, by increasing the transmission speed or suppressing the fader disassembly ability,
The control channels can be increased to a considerable number.

4) Not only remote control of the fader but also equalization and gain adjustment of the head amplifier can be developed into a more full-scale device.

5) The level can be easily balanced because the main mixer can collectively manage even when no one is on the go.

[0034]

As described above, according to the present invention, 1
Since the same mixing control as in the past can be performed simply by pulling a cable, the cable laying work can be greatly reduced. In addition, the audio levels of resources in a wide range can be centrally managed at one place.

That is, according to the present invention, conventionally, in relaying, it has been necessary to pull in as many cables as resources (microphones) into a mixing room (relay vehicle or the like).

In order to remotely control the mixing amplifier, three lines, an audio signal line, a control line, and a power line were required.

The conventional inconveniences can be solved at once.

Further, according to the present invention, since the voice signal and the control signal can be bidirectionally transmitted in the baseband without performing the modulation / demodulation, not only a simple circuit configuration can be realized. It is possible to prevent deterioration of the audio signal due to modulation / demodulation.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram detailing a main part of FIG.

FIG. 3 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Remote Fader 2 A / D Converter 3 Parallel / Serial Converter 4 Multiplexing / Demultiplexing Section 5 Transmission Line (Cable) 6 Multiplexing / Demultiplexing Section 7 Serial / Parallel Converter 8 D / A Converter 9 VCA (Mixer)

Claims (3)

[Claims] 1. A remote mixing device for mixing and controlling audio signals obtained from a plurality of microphones via a single balanced transmission line, wherein audio level control information of a plurality of channels designated by a control side is serially digitalized. A first coupling means for converting the data into data and transmitting the data in-phase on two lines of the balanced transmission line; and a voice level from a signal received on the controlled side via the balanced transmission line. A second coupling means for extracting control information, and a voice signal mixed on the basis of the voice level control information extracted by the second coupling means are input and sent out in opposite phase on two lines of the balanced transmission path. The first transformer and the signal received on the control side via the balanced transmission line cancel the signal component of the voice level control information to extract the voice signal. And a second transformer, remote mixing device, characterized in that for exchanging the audio level control information and the audio signal through a single balanced transmission path. 2. The remote mixing device according to claim 1, wherein a shielded two-wire cable is used as the balanced transmission line. 3. The apparatus according to claim 1, further comprising a DC element capacitor for supplying power from the control side to the controlled side via one line of the balanced transmission line, the voice level control information and the A remote mixing device characterized in that power is supplied through a single balanced transmission line in addition to transmission and reception of audio signals.