Chapter 5 MMR-8 System Applications

This chapter offers more detailed information for using the MMR-8 with film and video applications. Setup Menu parameter selections, technical background information, and block diagram connections are also covered.

Film Post Production

A standard method of synchronizing a film transport with external audio devices (like the MMR-8) is to use the pulse-interlock signal, or as it is more commonly known today--the biphase control signal, as a method of generating time code from the film’s movement to drive the various audio devices.

The biphase control signal consists of two 5 volt or 12-volt pulses (called phase A and phase B) that are generated from the sprocket drive motor on the film transport. The phase relationship between the two pulses indicates the transport direction (when phase A leads phase B by 90° the film is moving forward), while the pulse frequency indicates the relative film speed (the nominal pulse rate indicates play speed, with higher rates indicating wind speed and slower rates indicating crawl speed).

It is only through knowing exactly how many pulses are generated per frame, and then keeping track of the total number of pulses that have been received (while subtracting pulses for when the film is moving in reverse), that the MMR-8 can constantly translate the biphase signal into the correct feet & frames or SMPTE/EBU time code numbers for the film frames. Since there are several “standard” biphase pulse rates used by the various film transport manufacturers, there is no one nominal frequency of the biphase signal for normal film play speed (pulse frequencies of 48 Hz up to 2400 Hz are used per frame). For the MMR-8 to interpret and lock onto a biphase signal, and to generate the correct time code numbers, it must be given the correct Setup parameters for the type of transport that it is following (Setup Menu 301). Table 5.1 lists the biphase pulse rates the MMR-8 can lock to and some examples of the equipment for each rate.

Biphase

Biphase Play

Transport

Acceleration /

Notes

Pulse Rate

Frequency

Type

fast wind speed

 

2 ppf

48 Hz

DIN standard

32 / 15x

Also used by Westrex

4 ppf

96 Hz

Westrex

8 / 5x

Alternate DIN standard

10 ppf

240 Hz

MTE

8 / 5x

 

20 ppf

480 Hz

RCA

8 / 5x

 

25 ppf

600 Hz

RCA

8 / 5x

 

50 ppf

1200 Hz

RCA

8 / 5x

Biphase only

100 ppf

2400 Hz

MTM

8 / 5x

Biphase only

ppf = pulse per frame

Table 5.1 Biphase Pulse Rate Settings

MMR-8 Tascam MMR-8 Owner’s Manual • Chapter 5 • MMR-8 System Applications

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Tascam owner manual MMR-8 System Applications, Film Post Production

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.