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Stereo signal communication system and method
| Details |
Inventors: Eckstein, Eric A.; Haubrich, Charles H.;
Assignee: QEI Corporation (Williamstown, NJ)
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Free; Albert L.
A system which enables transmission of a standard composite stereo sound signal, made up of baseband, subcarrier band and pilot signals, from a first location to a second location while requiring only a relatively low bit rate for the transmission link. The standard composite stereo signal is synchronously sampled at a first location at rate F.sub.s twice the subcarrier frequency F.sub.c (four times the pilot frequency F.sub.p), and the sampled signal transmitted over the link along with appropriate synchronizing signals. At the second location, a signal processor separates the received signal into a first signal related to one stereo channel signal (e.g. R) and a second signal representative of the other stereo channel (e.g. L), determines the proper scale for the pilot signal, and regenerates the original standard composite stereo sound signal by combining the L-related and R-related signals with the pilot scale signals in appropriate proportions and with appropriate filtering. Bit interpolation techniques are preferably employed at the second station to facilitate the necessary filtering. |
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DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS Referring to the specific embodiment shown in the drawings, and without thereby in any way limiting the scope of the invention, FIG.
1 shows one known form of apparatus for transferring or translating a signal from a studio 10 to a remote FM transmitter 12.
One stereo signal (i.
e.
the Right channel signal designated R) is sent over a standard telephone line 16 to a composite stereo generator 18 at the FM transmitter; the other stereo signal (the Left signal, designated L) is separately transmitted over its own telephone line 20 to composite stereo generator 18.
The latter generator responds to the L and R signals to generate the standard composite stereo signal at the transmitter location, and to apply it to the transmitter.
As mentioned above, this has known drawbacks which make the system very undesirable in practice.
FIG.
2 shows, in accordance with the prior art, a similar studio 10 and remote FM transmitter 12, but in this case the composite stereo generator 18 is at the studio location, and the composite stereo signal is applied to a microwave transmitter 24 for space transmission to a microwave receiver 26 at the FM transmitter location, for detection and application to the latter transmitter.
This conventional system operates well, but requires the microwave transmitter and receiver, the two microwave antennae, and a clear line-of-sight between the antennas, as well as path availability.
FIG.
3 shows a general arrangement according to this invention.
The composite stereo generator 18 is at the studio location, and the composite stereo signal is transferred from studio 10 to remote FM transmitter 12 by way of a studio CAT-Link 26, a standard CSU unit 28, a T-1 telephone line 30, a standard CSU 32 and a transmitter CAT-Link 36.
The two CAT-Links contain apparatus in accordance with the invention as described below herein.
First there will be described one standard way in which the composite stereo signal is originally generated by generator 18 at the studio, as shown in FIG
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