"Eventide BD600 Digital Time"
When the radio program is broadcast on the radio, since some unexpected causes affect the quality of the broadcast, there will be some adverse effects to the radio station. For this life program, it is necessary to delay the time for taking measures, so the broadcast delay is an indispensable device when the radio broadcast program is. With the development of technology, the digitalization of radio radio equipment is constantly popular, and the functions of digital broadcast delay are also increasingly perfect. The digital delay is more superior in all aspects of function, control, sound quality, and security factor than the simulated delay. We have used Eventide's BD delay series such as BD942, BD500, and newly purchased BD600. BD600 delay is based on the BD500 delay, and the functional and user operations have great improvements, and live security and reliable coefficients have greatly improved, which greatly reduces the impact of string delay on program quality. . Especially after the BD500 digital delay is discontinued, the BD600 has jumped into a new favorite of the Eventide delay series. First, the working principle The signal flow of the BD600 digital delay is shown in Figure 1, where the DSP / Memory is the core portion of the determination of the delay delay. The basic working principle is that analog audio signal is converted into a digital signal by A / D, enters the DSP card, and passes in the memory in the order of advanced first. The microcontroller control portion of the motherboard is set, such as deletion, establishment delay, exit delay, short-time deletion, and establishment delay, exit delay, short-term deletion, delay, exit delay, short-time deletion, delay, delay, delay, processing, and processed digital signals directly by AES / EBU, Or after the D / A conversion is output. When the BD600 is delayed, the delay time is determined by the ratio of the delay buffer storage amount to the data extraction speed within the memory. When we actually operate, it is mainly to achieve the addressing of the extraction data and the speed change of the storage data is achieved through each function button. Delayed time = memory storage data amount / data extraction speed is due to the rapid increase in the CPU processing speed, thereby making the accurate and minimum delay of the BD600 delay can achieve 100 seconds. Second, the BD600 main feature BD600 is the maximum delay time of 80 seconds, twice the BD500. At the same time, the BD600 also adds a PANIC key, that is, the emergency button to achieve emergency function. When the PANIC key acts, all the storage amounts in the delay buffer will be cleared, and the sound files saved in a WAV format saved on the CF card (Compact Flash Card) will automatically play. The latency buffer will be delayed when the sound file is played. In addition, the micro-delay of the BD600 can establish a 10 second delay adjustment in an increment of more than 100 seconds, which is especially useful for the hard disk recorder to perform the effect of recording the program. We can control the BD600 delay by panel or controllable interfaces. Such as: Optional BD600 extension remote control. The main features of the BD600 are: ● Micro-fine delay mode, suitable for hard disk recorders ● Time-80 seconds of delay protection ● When delay reconstruction, press PANIC keys to play the CF card sound file playback ● 24 AES / EBU number Input and output, with four different optional word clock synchronization ● 24-bit analog XRL input and output ● User-defined DUMP length ● Snene keys can be instantly edited ● Remote connection, remote control ● RS-232 input and output ● Editable input and output ● Remote selection provides 16 two-stage optical isolation input, 16 open output three, BD600 basic functions Although the BD600 is powerful, it is fully utilized, but in the actual broadcast live broadcast In the application, the requirements for each live broadcast computer room requires the following functions: 1. REBUILD is established. At the beginning, there is no storage content in the delay buffer. The data is entered; the latency buffer storage amount gradually increases until the amount required for the set delay time (we set to 6 seconds) At this time, the delay is established. During the delay is established, the longer the time required, that is, the amount of increase in the amount of storage is gentle, the more it is not easy to cause changes in the output audio signal. If the amount of storage is suddenly increased to the required capacity, the marginal effect is too large, which will produce significant changes, resulting in an output audio signal to be perceived by the human being. The rebuild process of the BD600 delay is factory set to 120 seconds, and the user can customize the selection range of 1.0 seconds to 267 minutes, while the BD500 is selected for 40 seconds to 720 seconds. 2, delay is zero (Ramp to Zero). This function work is similar to the Rebuild function, but the reverse work process of Rebuild. The storage amount of the delay buffer gradually decreases until it is reduced to zero, the delay is in straight-through state, the entire process takes a few minutes; the impact on the output audio signal is not perceived, generally used to participate in live broadcast programs in the hotline Down. 3, waiting for the safety delay. This feature rapidly increases the delay correlation from 0 seconds to 4 seconds. At the beginning, the storage amount of the delay buffer is 0, the delay is in the bypass state, and the output audio is a straight-through audio signal. When the storage amount of the delay buffer reaches the storage amount of the delay 4 seconds, the output data extraction will replay the starting point of the memory, so that the 4 seconds that have been stored will replay it once, and the delay is also 4 Second, the DUMP indicator is lit, the BD600 remote output port RLA2 also begins with an output signal, and other related button functions can also be applied (such as Wait and Exit, Dump, Sneeze and other functions). For example, during the waiting process, the storage amount of the delay buffer continues to increase until the amount of storage required for the set delay is not required, and the time long selection range of the safety delay is 1.0 seconds ~ 10.0 seconds, the factory is set to 4.0 seconds. 4, waiting for the exit delay (Wait and Exit). This feature is to clear the delay buffer, so that the delay is 0 seconds. 5, sneeze function (Sneeze). This feature is to press and hold the Sneeze button when the host wants to sneezing or cough, and the resulting control command enables the extraction of the data within the delay buffer to decrease the delay storage, thereby reaching the output signal. Sneezing or coughing noise to ensure the quality of the program. When the Sneeze button is released, the amount of buffer storage is fixed at this time. Thereafter, the storage amount of the delay buffer gradually increases to the amount required to set the delay time. If the Sneeze button is still holding down, the delay storage will gradually decrease until the last is 0 seconds. The delay has no signal output. 6, delete function (DUMP). This function is to delete an indecent statement after an indecent statement, thereby ensuring the quality of the program. After the DUMP function, the delay buffer extracts data addressing to the back 4 seconds (can be customized, factory set to 4 seconds), and cut off an indecent statement. The storage amount of the delay buffer will be automatically increased, and the amount required for the original set delay time is set. The time length deleted by the deletion function can be selected from 1.0 seconds to 10.0 seconds. Within the delay protection time, after the first DUMP, the indecent statement that will be continuously deleted. 7, emergency function (PANIC). The front panel of the BD600 is more than a PANIC key and a CF card slot than the BD500, and the emergency function is added. This function is to operate the PANIC function key, clear all the storage contents in the delay buffer, and the WAV audio file stored in the CF card will automatically output the WAV audio file in the CF card, and then reconstruct the storage amount of the delay buffer. After the reconstruction is completed, if the audio file on the CF card has not been broadcast, it will go until the end of the broadcast; or the PANIC contingency function is canceled by pressing the PANIC button again, it will return to the delay output of the delay. You can store up to 4 audio files in the CF card, and the file naming must be One.wav, Two.wav, Three.wav, and Four.wav. When actual application, you can only set one of the audio files. In addition, the PANIC key does not match the CF card, and the PANIC key can be set to the emergency silent function, and the mute selection range is 2.0 seconds to 8.0 seconds, and may not be set. At this time, the PANIC key is restored to the full functional parameters of the BD600 to the factory settings. The above seven functions are very simple. The host can choose the function required to achieve the functions required according to different situations of different types of programs. These functions provide a powerful technical guarantee for the security and quality broadcast of live programs. Four, the use of BD600 Before investing in use, we use the AM700 audio tester to detect various technical parameters indicators of the delay, including correcting, adjusting the input / output level of the BD600 delay, to ensure optimal Broadcast quality. At the same time, the BD600 provides the user password protection function to protect the settings of the delay not being changed freely. In practical applications, we also verify that the basic functions of the BD600 delay are normal by personally, which is generally set to the delay and password protection settings, and other technicians require the setting process and application. 1. Set the BD600 delay before use, we need to complete the settings according to actual needs. First, set a suitable delay, integrated the type of actual live broadcast program and the normal response speed of the operator, and the delay time length of the delay in the unit is set to 6 seconds. Once the power of the BD600 is opened, the default power-on state is live broadcast, and the user settings are entered through the CONFIG key, then use the wait for SAFE button, the wait and exit button, the REBUILD button, and the Ramp to zero key to specifically set the delay sampling frequency. , Input / output level, input audio type, bit rate when serial communication, and time length of each basic function key. The specific setting steps are as follows: ● First click the Bypass key, then click the config button to enter the setting status. ● Click two Config keys to enter the Time Parame-Ters menu settings ● Click Wait for Safe (left) / wait for exit (right) to select the classification settings under this menu. ● Click Wait for EXIT to enter the DLAY, select the appropriate time setting with Rebuild / Ramp to Zero (below). ● Click Right-click to enter the Dump Reb Safe Panc menu, select the appropriate time settings ● Click Config to enter the Audio Parameters menu. ● Click Right-click to enter the Select Enter menu Input Source Select analog or digital input ● Click Right click to enter the IN G, OUT G menu Select the right standard ... In addition, the Sneeze key can restore each setting item to the factory settings. Once the setting is complete, the user setting status is exited by the BYPASS key, and the direct state is entered. This ends the entire setting, each function can operate. 2. There are two types of input / output ports connected to the BD600. According to our current live computer room and the actual audio transmission method of the total control computer room, we use analog and digital input and analog output connections. We connect the simulation and digital output signals of the digital broadcast mixer to the analog and digital input ports of the BD600, and then transfer the BD600's simulation output to the total control machine room through the machine room, thus completing the live-tech computer room and total control computer room. Signal transmission (see Figure 2). 3. Operation of the operation of the BD600 delay is very simple, as long as the corresponding function keys can be operated according to the actual live broadcast program. In practical applications, the program is generally in the delay. When the emergency occurs, the host can guarantee the safety of the DUMP button in time, and the other function keys are only in the case of the program. use. 4. Maintenance When the week inspection and month check, the various functions of the delay will be inspected to ensure that the delay can be used normally. The front panel of the BD600 has a 4-character display than one character of BD500, and the display information is more eye-catching. When the delay is wrong, the display shows the error code, which is advantageous to maintain the device according to the error code. When maintenance is maintained, we pay attention to the cleaning of the delay and the ventilation, heat dissipation conditions of the equipment, and maintain a good environment for the normal operation of the equipment. 5. Conclusion BD600 is the most mainstreaming professional delay in the eventide delay in Eventide delay. We think that the machine has been easy to operate, which has brought great convenience for the host, and its more powerful emergency function provides a strong guarantee for radio security and quality broadcast. "
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