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Wireless music and data transceiver system
| Details |
Inventors: Knox, Gregory D.;
Assignee:
Primary Examiner: Kostak; Victor R.
Assistant Examiner:
Attorney, Agent or Firm: Blakely Sokoloff Taylor & Zafman LLP
A method and apparatus are provided for a first controlled device, such as a wireless local transmitter that accepts a plurality of digital audio signals and corresponding program information signals converted from a controlled source, such as the encoded digital data provided by a digital data signal source, typically a community antenna television (CATV) cable or direct broadcast satellite, then modulates said digital audio and corresponding program information signals on different carrier frequencies and transmits the modulated signals to a plurality of second controlled devices, such as remote digital receiver/tuners that demodulate said signals to output music in stereophonic sound and display the corresponding program information by means of an alphanumeric display. The first and second controlled devices contain microprocessor systems for communicating, controlling, storing, processing, and display of digital data within the operation of the respective system. A high speed, error free, digital signal protocol is utilized for transmitting digital audio and corresponding program information signals to and from the digital receiver/tuner. The digital data transmitter and digital receiver/tuners utilize the 44.1 kilohertz (kHz) Compact Disc (CD) clock signal embedded in digital audio signals provided by an established delivery system to derive clocking signals for reception and processing of digital audio signals and for implementing the display information communications protocol. |
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DETAILED DESCRIPTION OF THE INVENTION With reference first to FIG.
1, a system is illustrated therein for local wireless transmission and reception of digital audio and program information.
A delivery system 10, such as coaxial cable, satellite, the Internet, microwave, and etc.
, outputs a serial digital audio/program information stream 22 that contains digital audio, program information, and national subscriber information.
The transmitter 100, more fully described with respect of FIGS.
2-2a, receives the said serial digital data stream 22 and demultiplexes, decrypts, and decodes the digital audio and program information signal.
The digital audio signal and program information are converted to a digital RF carrier frequencies and broadcasted to a plurality of second devices, preferably at least one receiver/tuner unit 200, more fully described with respect of FIGS.
3-4, that outputs the selected audio electronically and displays the corresponding program information of the audio track currently listened to by the subscriber.
Digital Music Transmitter FIG.
2 is a block diagram of the preferred digital music transmitter (DMT) 100.
Referring to FIGS.
1-2, the serial digital data stream 22 is passed via an established system of digital data distribution 10, for example, multisystem operator's coaxial cable or direct broadcast satellite, and is received by the transmitter input terminal 105.
The transmitter input terminal 105 preferably includes phase-lock loop (PLL) circuitry.
The signal is amplified by an amplifier 110 and filtered by a SAW filter 115 before being demodulated by a demodulator 120.
The demodulator 120 converts the selected digital frequency to demodulation intermediate frequency (IF).
The output of the demodulator 120 is quadrature partial response (QpR) demodulated to produce a 5.
6 Mbps data stream containing 150 stereo pair of digital audio data to an applications specific integrated circuit (ASIC) 130.
The demodulator 120 provides data to a data clock recovery PLL 125.
The data clock recovery PLL 125 contains a 33
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Television 
