Multi-channel PCM music broadcasting system
First Claim
1. A music broadcasting system comprising:
- a transmitter including,(a) a plurality of time division multiplex (TDM) units, each unit accommodating music source channels and multiplexing signals from the music source channels in TDM channels to produce a TDM signal; and
(b) a frequency division multiplex (FDM) unit for multiplexing the TDM signals from said plurality of TDM units in assigned frequency bands to produce a FDM signal for transmission,wherein the TDM signal in each frequency band includes music data for music source channels accommodated by the TDM unit corresponding to the same frequency band and header data for music source channels accommodated by all the TDM units in the transmitter, and the header data includes operation mode information representative of association of the music source channel with the frequency band for every music source channel;
a receiver including,(a) means for receiving the transmitted FDM signal for the selected frequency band;
(b) means for reproducing the TDM signal in the selected frequency band;
(c) means for detecting the header data in the selectively received TDM signal; and
(d) control means responsive to the designation of the music source channel by an operator for identifying the frequency band associated with the designated music source by referring to the detected header data and controlling said receiving means to receive the transmitted FDM signal for the identified frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
In multi-channel PCM music broadcasting system, a plurality of blocks are time division multiplexed, each block having at least one music channel for a PCM formatted music signal and having an independent operation mode information. The time division multiplexed signal modulates a carrier, and a plurality of time division multiplexed signals each having a frequency shift from the carrier are frequency division multiplexed for transmission. The operation mode information for the plurality of blocks is collectively inserted in a time division multiplexed frame, an operation mode information for the plurality of time division multiplexed signals each having a frequency shift is exchanged among a plurality of time division multiplexing units, and both the operation mode informations are commonly inserted in the time division multiplexed frame for transmission. Upon designation of a music channel at a receiver side, both the operation mode informations are referred to to select a particular frequency and block including the designated music channel.
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Citations
6 Claims
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1. A music broadcasting system comprising:
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a transmitter including, (a) a plurality of time division multiplex (TDM) units, each unit accommodating music source channels and multiplexing signals from the music source channels in TDM channels to produce a TDM signal; and (b) a frequency division multiplex (FDM) unit for multiplexing the TDM signals from said plurality of TDM units in assigned frequency bands to produce a FDM signal for transmission, wherein the TDM signal in each frequency band includes music data for music source channels accommodated by the TDM unit corresponding to the same frequency band and header data for music source channels accommodated by all the TDM units in the transmitter, and the header data includes operation mode information representative of association of the music source channel with the frequency band for every music source channel; a receiver including, (a) means for receiving the transmitted FDM signal for the selected frequency band; (b) means for reproducing the TDM signal in the selected frequency band; (c) means for detecting the header data in the selectively received TDM signal; and (d) control means responsive to the designation of the music source channel by an operator for identifying the frequency band associated with the designated music source by referring to the detected header data and controlling said receiving means to receive the transmitted FDM signal for the identified frequency band. - View Dependent Claims (2, 3, 4)
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5. A transmitter comprising:
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a plurality of time division multiplex (TDM) units, each unit accommodating music source channels and multiplexing signals from the music source channels in TDM channels to produce a TDM signal which includes music data and header data representative of TDM multiplexing format a bus connected to said plurality of TDM units for exchanging the header data among said plurality of TDM units so that the header data of the TDM signal for each TDM unit includes the TDM multiplexing formats of all said plurality of TDM units; and a frequency division multiplex (FDM) unit for multiplexing the TDM signals from said plurality of TDM units in assigned frequency bands to produce a FDM signal for transmission. - View Dependent Claims (6)
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Specification