ABOUT DV77

The digital video camera converts incoming audio and video signals into digital form for recording.

A video signal is composed of a luminance signal (Y) and color signals (R-Y and B-Y). These signals are identified and recorded digitally (Digital Component Recording). The A/D (Analog to Digital) converter samples the Y signal at 13.5 MHz, and R-Y and B-Y at 3.375 MHz, and changes them to an 8-bit quantum signal.

Sound sampled at 48 kHz is changed to a 16-bit quantum signal, and sound sampled at 32 kHz is converted to a 12-bit signal.

NOTE:

The data recorded on a tape is digital, but the output of the GR-DVM1 is analog.

VIDEO

Lens

 

Luminance Signal (Y)

 

 

 

Color Difference

 

 

 

 

 

 

 

 

 

 

 

 

Signal (R-Y)

 

 

 

 

 

Chrominance (C)

 

 

Chromatic

 

 

 

 

 

 

 

 

Analysis

 

 

 

 

 

 

 

 

 

 

 

 

 

AUDIO

 

 

Color Difference

 

 

Signal (B-Y)

 

 

 

 

 

 

Mic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A/D

conversion

A/D

conversion

A/D

conversion

A/D

conversion

Recording by rotating head helical scan

Signal

compression

The GR-DVM1 separates the data into blocks, writing one block of each data type on each track of the tape.

Tape direction

Sub-Code Area

Video Area

Audio Area

ITI Area

Head tracking direction

10 tracks/frame

5.24 mm / 1/5"

6.35 mm / 1/4"

1Sub-Code Area

The Time Code and Date/Time data are written here, separate from the video data. This enables you to display the date and time during playback, even if they weren’t displayed while recording.

2Video Area

3Audio Area

The digital audio signal is recorded here.

4ITI (Insert and Tracking

Information) Area

Insert editing and post-recording editing tracking signals are recorded here.

The digital video signal is recorded here.

Page 77
Image 77
JVC GR-DVM1 manual Sub-Code Area, Video Area Audio Area, ITI Insert and Tracking Information Area

GR-DVM1 specifications

The JVC GR-DVM1 is a remarkable piece of technology that represents a significant leap in the world of digital camcorders. Released in the early 2000s, this compact device quickly gained recognition for its innovative features and user-friendly design, catering to both amateur videographers and seasoned professionals.

One of the standout features of the GR-DVM1 is its ability to capture stunning video quality thanks to its advanced Progressive Scan technology. This allows for the recording of smoother video footage, perfect for dynamic scenes. The camcorder utilizes a 1/4-inch CCD sensor, delivering a resolution of up to 680,000 pixels, which translates to sharp, vibrant images that reflect true-to-life colors.

The camcorder's 10x optical zoom lens offers exceptional versatility for capturing distant subjects without sacrificing clarity. Coupled with a digital zoom capability, the GR-DVM1 allows users to get closer to their subjects, whether filming a scenic landscape or a candid moment at a family gathering. The lens is designed to minimize distortion, providing both wide-angle and telephoto capabilities.

Flexibility in shooting styles is further enhanced by the camcorder’s built-in digital effects, which include various transitions and filters that make it easy to add a professional touch to home videos. The ease of use is evident in its intuitive controls, enabling users to navigate settings effortlessly. An LCD screen provides a clear view while composing shots, and it's adjustable for optimum viewing angles.

Another notable characteristic of the JVC GR-DVM1 is its compatibility with various recording media. It supports MiniDV tapes, which were popular at the time for their reliability and quality. This format also makes it possible to obtain recordings that can be transferred to a computer for editing or archiving.

In terms of connectivity, the GR-DVM1 is equipped with FireWire (IEEE 1394) ports, enabling straightforward digital transfers to compatible devices. This allows for seamless integration into a digital editing workflow, where hours of recorded footage can be quickly imported for post-production.

The JVC GR-DVM1 not only excels in video capabilities but also includes a built-in microphone and the option for external mic support, ensuring high-quality audio to complement the impressive visuals. With its combination of advanced technology, user-friendly features, and portability, the JVC GR-DVM1 remains a noteworthy camcorder that played a vital role in the transition to digital video recording. Its legacy continues to influence camcorder design and functionality in subsequent generations.