How to set up a studio camera

Tiger combines radio and television monitors to form a small studio (50 square meters studio) model

The main components of a system

1. Video system

(1) Studio cameras

The studio uses 2 sets of Hitachi 2800 cameras and 1 set of Panasonic AW-E600E Convertible cameras. Among them, Panasonic AW-E600E is used as a panoramic camera for studio hosts and guests.

(2) Video switcher

The video switcher uses Sony DVS-7150 digital switcher. Since the program department often uses video connections during live broadcasts, digital stunts are required. Implement two active video windows. In addition, title pictures are needed for Spanish news, so we use Sony DME-7000 stunt machine in conjunction with Sony DVS-7150 switcher to realize some special functions.

(3) Hard disk video recorder

Considering that there are usually three external signals during large-scale live broadcasts, and to ensure the stability and safety of the signals, we chose a Sony MAV-555A hard disk Video recorder, 1 LEITCH 445 and 1 LEITCH 440 hard disk video recorder.

Sony MAV-555A hard disk video recorder uses multi-channel hard disk recording and playback. It has high security for data storage and is especially suitable for long-term continuous operation. This device can choose from three recording qualities: 30Mbps, 40Mbps, and 50Mbps; it comes standard with an 18G hard drive and can record 5.6 hours of 50Mbps programs; it can be configured as 1 in 1 place, 2 in 2 out, 3 in 1 out, or 1 in 3 out and many other forms. In addition, the machine also has other practical functions such as fast editing, non-linear editing, fast uploading and downloading of material SDTI, super slow motion, and support for Gigabit Ethernet.

In the live news studio, the hard disk video recorder is mainly used for the delay of large-scale live broadcasts. We use the Sony MAV-555A hard disk video recorder as the delay of the main external signal signal, and at the same time, the remaining 1 Input and output are used as 1-channel PGM recording and 1-channel pad broadcast signal for loop playback in case of emergency broadcast. LEITCH's two hard disk video recorders are used as delay servers for the backup signal and the third signal.

(4) Video recorder

The studio uses 2 Sony DVW-500P as recorders and 3 DVCPRO AJ-D965 as players. Two recorders, one master and one backup, are used to produce broadcast tapes, and three playback machines are used to play news editing tapes during live broadcasts.

2. Audio system

Since the studio broadcasts live news programs in two different languages, Spanish and French, the audio system is particularly important here, and the design is somewhat complicated.

(1) Main mixer

The main mixer uses an EELA-340 analog mixer. Since it is a live broadcast and needs to meet the production needs of multi-lingual news programs, we require Sound console: It has main and backup power supplies to meet long-term 24-hour non-stop operation; analog balanced line input ≥ 28 channels and analog balanced line input ≤ 36 channels, MIC input ≥ 4 channels, AUX ≥ 3 channels, of which 3 channels should have N-1 function (for telephone coupler, announcer monitoring); the main program output is an analog balanced line output; the left channel output is normal program broadcast, and the right channel output can be selected as an input source different from the left channel ; Can be connected to the existing call system DRAKE EASI-1300. The monitoring signal entering the announcer's headset can be selected as PGM signal (broadcast channel) or other non-broadcast signal (channel); comes with matching accessories cough box.

Since the Western French Channel will use multiple channels of external signals (on the premise of providing the selection of external signals in multiple languages) for simultaneous interpreters or guests during live broadcasts, it is specially equipped with The two 121 matrices of the EELA-340 analog mixer facilitate the selection of different channels of external signals to meet the needs of live broadcast programs. This satisfies the situation where one of the simultaneous interpreters is a Chinese employee and the other is a foreign employee, and the Chinese employees need to monitor Chinese. Foreign employees need to monitor situations in English or other languages. The specific usage is introduced in the following examples.

(2) Preparation mixer

The preparation mixer uses YAMAHA-MV800, which connects the external signals (over-delay) of the three channels DEL1, DEL2 and DEL3. Channels 1 and 2 and the backup microphone are connected to the backup mixer. The logic diagram is shown in Figure 1 of the emergency system.

The entire main audio channel to the output of the mixer is an analog signal. Before the signal is sent to the audio distributor for broadcast, it is first sent to the audio embedded card. The digital video signal with embedded audio is sent to the optical transceiver ( VPG ENCODER), avoiding the attenuation and delay of audio signals.

3. Synchronization system

For live broadcast, the synchronization system plays a decisive role.

The synchronization system of Studio 16 consists of main and backup synchronizers (SPG-422) and automatic synchronization converter (ECO-170). It uses equipment from Tektronix, which can provide multiple phase planes for the system equipment. B.B signal and common test signals. The B.B synchronization signal of the master control is sent to the SPG-422 synchronous machine in the studio through a cable, and the synchronizer is externally phase-locked to synchronize the studio system with the entire Taiwan master control system.

4. Peripheral supporting equipment

The system is equipped with Hizor radio and television monitor HM-4220 and Hizor dual monitor HM-9020B for monitoring digital signals and analog signals.

The system uses LEITCH's 6800 series multi-function chassis and peripheral special processing cards. The signal processing cards of the main and backup channels are distributed in different chassis as much as possible, which reduces the system failure caused by a single device failure. Risks for normal operation to ensure safe broadcast.

5. Emergency system

When it comes to safe broadcasting, we have to mention the emergency system. The working principle of safe broadcasting is: prevention inspection first, technical support in place, and emergency operation effective .

Term definition:

* Normal PGM output: normal program output determined in the live broadcast technical plan;

* Emergency backup signal: determined in the emergency plan Backup signal used. In this system, the P2 signal VDR1 of delayer Sony MAV-555A, camera CAM 1/2, etc. are generally used as regular emergency backup signals. For important live programs, the editing and broadcasting department should prepare emergency backup tapes that meet technical standards in advance;

* Abnormal sound signal: Silent or poor-quality sound signal. When there is no quality difference between the main and backup channels, it needs to be determined by the on-site tuner to determine whether it is a poor-quality sound signal;

* Main route: The route from the normal PGM output to the normal broadcast channel via the master control;

* Backup route: The route from the emergency backup system output to the emergency broadcast channel via the master control.