Boots – shoes – and leggings
Patent
1996-02-15
1998-07-21
Voeltz, Emanuel Todd
Boots, shoes, and leggings
348462, 348467, 370471, 370474, H04N 700
Patent
active
057842779
DESCRIPTION:
BRIEF SUMMARY
This invention is directed toward a method and apparatus for encoding audio data in a packet format according to a predetermined protocol.
BACKGROUND OF THE INVENTION
High Definition Television (HDTV) is generally used to describe systems which provide high definition video, stereo sound and auxiliary data within given constraints of bandwidth, compatibility, and cost. The primary concerns of HDTV are to digitize a high resolution signal, compress the digital signal to fit into a standard television channel, and then transmit this compressed digital signal over a 6 MHz channel within predetermined constraints. The high resolution signal is separated into its video, audio and data components. Each is compressed and encoded separately from the other components.
The compression and encoding of the audio digital signal in the present system will be described in terms of MPEG standards. MPEG is an international standard developed by the Moving Pictures Experts Group of the International Standards Organization for coded representation of moving pictures and associated audio stored on digital storage medium.
The audio processing function conditions a compressed audio signal for eventual transport terrestrially, through a satellite, or through other transmission media. The audio processing function accepts a serial stream of compressed audio frames from a frame encoder, such as a CCS-CDQ-2000 compressor available from CCS Audio Products. The frame encoder provides an audio MPEG signal at an output digital bit rate user selectable from 56 to 384 Kbps depending on the quality of the desired output. An audio processor converts the bit stream into a byte-wide digital signal and inserts appropriate header information to create MPEG packets and transport packets. The audio processor may include a clock and timing generator, frame synchronizer, MPEG packet encoder, transport processor, and output buffer. The present invention concerns an MPEG packet encoder which encodes a byte-wide digital signal supplied by a frame synchronizer into MPEG transport packets.
An MPEG packet encoder may include a multiplexer to concatenate header information with the digital audio data signal, circuitry to supply header information, and a sequence controller or state machine to control the input of the header information to the multiplexer.
SUMMARY OF THE INVENTION
A frame synchronizer supplies a frame aligned byte-wide data signal to a multiplexer through delay circuitry. The delay circuitry delays the data signal to allow a predetermined number, for example eight, of bytes of information to be inserted as a frame header. Portions of the header information may be calculated prior to an encoding session and stored in a storage medium. The frame synchronizer supplies a start-of-frame signal to a package sequence controller. In response to a start-of-frame signal, the package sequence controller generates control signals to control the insertion of header information from the storage medium into the data signal and to control the operation of the multiplexer. The package sequence controller includes a state machine that has each state predefined to directly control the multiplexer or other circuitry.
A particular embodiment of the invention includes a packet encoder having a state machine which provides an S-bit output signal defining a plurality of system states, various sources of header data and compressed audio data and a multiplexer.
N of the output bits of the state machine, (N<S), are coupled to directly control the multiplexer. Under this control, the multiplexer concatenates header and compressed audio data into packets according to a predetermined protocol. Respective states of the state machine are selected such that the N bits control the multiplexer without an intervening state decoder.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an embodiment of a realtime audio MPEG packet layer encoder embodying the present inventions.
FIG. 2 is a block diagram of an embodiment of an MPEG packet sequence control
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Cole Tony M.
Hayes James B.
Herrmann Eric P.
RCA Thomson Licensing Corporation
Todd Voeltz Emanuel
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