Biphase Connections

Biphase is a control signal typically generated by a film projector and is traditionally used to interlock the operation of the film with sprocketed magnetic tape machines. The Biphase Operations Board (BOB) on the back panel of the MMR has four biphase input connections and one biphase output connection for synchronizing the operation of the MMR-8 to film transports. Use Setup Menu 100, Sync Group, to select which of the four Biphase inputs (Sync Groups) will control the system. The biphase connections use

6-pin modular RJ-12 connectors (like those used on commercial phone systems) and twisted multi-pair cabling (Category 5 Ethernet). Up to 100 feet of cable can be typically run from a biphase device to the MMR-8 or vice versa. The pinout diagram for these connectors is given in Appendix D: Cable Information.

Unlike time code, Biphase gives only speed and direction and does not contain an absolute address. To set the MMR to lock to biphase, or to be a biphase master device, use Setup Menu

000, Control Mode. The various biphase parameters such as frame rate, pulse rate, acceleration, etc. are set in the 300 series Setup Menus. Not intended for public telecommunication network connection.

Digital Audio Sample Reference Connections

In combination with a frame reference for video and film, there may also be a sample reference for the audio. The sample reference can be taken from one of the digital inputs, the frame reference, the Word Clock input (if there is an active signal on that input), or the system’s internal clock source. These connections are described here in more detail.

Word Clock

Word Clock is a digital reference signal used by many digital editors and digital tape machines. This permits two digital audio devices to synchronize their sample clocks to facilitate digital audio transfers between machines, and to insure that they are running at precisely the same sample frequency. The signal is transmitted on an unbalanced coaxial cable that terminates into a BNC connector at the MMR-8 end. The MMR-8 has both a digital WORD CLOCK IN and a digital WORD CLOCK OUT connection using BNC connectors.

When an external tape machine is to control the sample rate of the MMR-8, connect the Word Clock output from that machine to the WORD CLOCK IN on the MMR-8. When the MMR-8 is to control the sample rate of an external machine connect the WORD CLOCK OUT from the MMR-8 to the Word Clock In on the controlled machine. The maximum practical cable distance is up to 100 feet. Use setup menu 002 to select the sample reference for the MMR-8 system. Normally this is a 48 kHz TTL- compatible (5 volt) signal.

AES/EBU Sample Rate

When using AES digital audio input, the audio sample reference for the MMR-8 can be taken from one of the four AES digital inputs. Use setup menu 002 to select the sample reference for the MMR-8 system. Setup Menu 600 selects which AES/EBU digital input pair will be used for the reference signal (input 1+2, 3+4, 5+6, or 7+8).

24

Tascam MMR-8 User’s Guide • Chapter 2 • Installation

MMR-8

Page 29 Page 31
Page 30
Image 30
Tascam MMR-8 owner manual Digital Audio Sample Reference Connections, Biphase Connections, Word Clock, AES/EBU Sample Rate
Page 29 Page 31

MMR-8 specifications

The Tascam MMP-16 and MMR-8 are two innovative products designed to meet the specialized needs of audio professionals, offering advanced features and capabilities suitable for various recording and playback applications.

The Tascam MMP-16 is a versatile audio router and mixer that excels in different environments, from live sound to studio recording. One of its primary features is the 16-channel configuration, allowing for significant flexibility in signal routing. The MMP-16 supports multiple audio formats, including analog signals, making it adaptable to a wide range of setups. It boasts high-quality AD/DA conversion, delivering excellent audio fidelity and low latency performance.

Additionally, the MMP-16 is equipped with comprehensive digital processing capabilities, including EQ and dynamics processing on each channel. This makes it ideal for both mixing live performances and preparing recordings for post-production. The unit's user-friendly interface includes an intuitive display and physical controls that streamline operation, making it easy for both novice and experienced engineers to navigate.

On the other hand, the Tascam MMR-8 is a robust multi-track digital audio recorder that offers exceptional reliability for professionals who require high-quality audio capture. This 8-channel recorder shines in its ability to handle various digital audio formats, ensuring compatibility with different workflows. One standout feature of the MMR-8 is its solid-state recording technology, which enhances durability and reduces the risk of data loss, a crucial aspect in high-stakes recording environments.

The MMR-8 also provides comprehensive onboard monitoring options, allowing users to assess audio quality in real time. Its extensive connectivity options include digital and analog inputs and outputs, facilitating seamless integration with other studio equipment and live sound systems. The data management capabilities of the MMR-8 make it easy to organize and retrieve recordings, while its compact design ensures portability without compromising on performance.

Both the MMP-16 and MMR-8 showcase Tascam's commitment to innovation and quality in the audio industry. Their advanced features, coupled with solid build quality and ease of use, make them essential tools for audio professionals seeking reliable solutions for their recording and mixing needs. Whether utilized separately or in conjunction, these devices amplify creativity and enhance the overall audio production experience.
Top Page Image Contents