An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level being adequate for reproduction with a certain reduced degree of fidelity. Successively higher hierarchial levels provide successively greater fidelity when reproduced. When the memory has been determined to have reached maximum capacity, recording continues by overwriting the highest hierarchical level of data currently stored in the memory with lower hierarchical levels of new data. A code is recorded in the memory, indicating the number of hierarchical levels recorded therein, for subsequent reproduction. The audio signal can furthermore be recorded in variable-length frames and reproduced at high speed by reading every N-th frame, N being a positive integer, or by reading only frames having at least a certain minimum length.

Methods of efficiently recording an audio signal in semiconductor memory

The authors focus on image data compression techniques for digital recording. Image coding for storage equipment covers a large variety of systems because the applications differ considerably in nature. Video coding systems suitable for digital TV and HDTV recording and digital electronic still picture storage are considered. In addition, attention is paid to picture coding for interactive systems, such as the compact-disc interactive system. The relation between the recording system boundary conditions and the applied coding techniques is outlined. The main emphasis is on picture coding techniques for digital consumer recording. >

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Data compression systems for home-use digital video recording

Due to the recent proliferation of digital broadcasting, several methods for broadcast streaming data, i.e., movies or music, using the division-based broadcasting scheme have been studied. In the division-based broadcasting scheme, by dividing the data into several segments and broadcasting them via multiple channels, the waiting time for clients to start playing the data is reduced. These methods usually calculate appropriate channel bandwidths and allocate them to each channel. However, in many cases, channel bandwidths are fixed for the restrictions of the broadcasting system. Therefore, it is difficult to allocate arbitrary bandwidths to each channel. In this paper, we propose a division-based broadcasting method considering channel bandwidths. Our proposed method divides the data into several segments based on the given channel bandwidths. By dividing the data so that clients can receive the next segment immediately before finishing playing each segment, the waiting time is reduced satisfying the condition that clients can play the data without any interruptions.

A Division-Based Broadcasting Method Considering Channel Bandwidths for NVoD Services

An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level sufficing for reproduction with a certain reduced degree of fidelity. Successfully higher hierarchical levels provide successively greater fidelity when reproduced. When the memory has been determined to have reached maximum capacity, recording continues by overwriting the highest hierarchical level of data currently stored in the memory with lower hierarchical levels of new data. A code is recorded in the memory, indicating the number of hierarchical levels recorded therein, for subsequent reproduction. The audio signal can furthermore be recorded in variable-length frames and reproduced at high speed by reading every N-th frame, N being a positive integer, or by reading only frames having at least a certain minimum length.

Methods of efficiently recording and reproducing an audio signal in a memory using hierarchical encoding

A dual image bus image reproduction apparatus is disclosed, which comprises an image memory capable of storing at least one frame of an image signal, a reproduction processor for performing reproduction processing of the input image signal and a controller for controlling the reproduction processor for a predetermined period of time beginning with the connection of the power source to allow a predetermined signal be provided from the reproduction processor.

Apparatus for still image reproduction which includes plural image busses

A system is described in which an uncompressed video signal is recorded on a disk and reproduced by a disk player that is connected to a high-definition television (HDTV) processor. Although primarily intended for still picture reproduction, this system can generate a display command that adds false moving-picture effects to the reproduced image. Each still-picture frame consists of 1280*1024 active pixels. This system records the luminance signal Y and two color difference signals CW and CN as component codes. The sampling frequency is 49.68 MHz for signal Y, and 24.84 MHz for the color difference signals. These signals are quantized by 8-bit linear conversion. The reproducing system has frame memory capacity equivalent to 2048*2048 pixels, 3.2 times the quantity of data per frame. Each frame memory stores data that continues over two frames and also provides vertical frame scrolls. Since video data can be transmitted in both horizontal and vertical scanning directions, the picture can be switched from one frame to another, making a vertical or a horizontal wipe. The remaining video area of the frame memory can store split-screen data. >

N. Takahashi

Papers

Digital still HDTV disc system