Multi-channel PCM music broadcasting system

• US 4,922,483 A
• Filed: 09/29/1988
• Issued: 05/01/1990
• Est. Priority Date: 10/02/1987
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Kenwood (JVC Kenwood Corporation)
• Original Assignee: Kabushiki Kaisha Kenwood (JVC Kenwood Corporation)
• Inventors: Kobayashi, Hirokazu
• Primary Examiner(s): Olms, Douglas W.
• Application Number:
  US07/250,721
• Time in Patent Office: 579 Days
• Field of Search: 370/50, 370/73, 370/124, 370/69.1, 370/76, 370/110.1, 370/53, 381/77, 381/80, 381/81
• US Class Current: 370/307
• CPC Class Codes: H04J 4/00 Combined time-division and frequency-division multiplex systems H04J13/00 takes precedence ; data transmission H04L5/26; telemetry G08C15/00

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.

Claims

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.

2. A music broadcasting system according to claim 1, wherein said header data further includes operation mode information representative of multiplexing format for each TDM unit and said control means in response to the multiplexing format in the detected header data controls said reproducing means to reproduce the signal of the designated music source channel.

3. A music broadcasting system according to claim 2, wherein said transmitter includes a bus linked to all the TDM units of mutually providing the header data among the TDM units.

4. A music broadcasting system according to claim 2, wherein the TDM unit in said transmitter includes an encoder for PCM-encoding the signal from the music source channel and said header data further includes operation information representative of PCM-encoding format for the same music source channel.

5. A transmitter comprising:

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.

6. A transmitter according to claim 5, each TDM unit includes an encoder for PCM-coding the signal from music source channels accommodated by the same TDM unit and the header data further representing the PCM coding formats for respective music source channels.