US3896269A - Four channel stereophonic broadcasting system and receiving device - Google Patents

Four channel stereophonic broadcasting system and receiving device Download PDF

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Publication number
US3896269A
US3896269A US364476A US36447673A US3896269A US 3896269 A US3896269 A US 3896269A US 364476 A US364476 A US 364476A US 36447673 A US36447673 A US 36447673A US 3896269 A US3896269 A US 3896269A
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signals
channel
composite
sub
composite signal
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Mayumi Cho
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Pioneer Corp
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Pioneer Electronic Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems
    • H04H20/89—Stereophonic broadcast systems using three or more audio channels, e.g. triphonic or quadraphonic

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  • a four channel broadcasting system of the instant invention utilizes an FM broadcasting wave of the pilot tone system having a main channel domain containing a first composite signal, a first sub-channel domain containing a second composite signal, and a second sub-channel domain containing a third and fourth composite signals.
  • the first, second, third, and fourth composite signals take the form 2LF+2RF+LB+RB, LFRF+2- LB2RB,2LF-2LB,2RF-2RB, respectively.
  • a second embodiment is disclosed in which the first, second, third, and fourth composite signals take the form LF- +RFLB 135+RB +45,LFRF+LB 45+R- B 45,LF+RF+LB +45+R- B l35,LFRF+LB +l35+RB +135 respectively.
  • Various matrixing arrangements for formulating four discrete output signals LF,RF,LB,RB from the four composite signals are also disclosed.
  • This invention relates to PM stereophonic broadcasting and, more particularly, to a four-channel stereophonic broadcasting system utilizing an FM radio wave as a transmission medium and a receiver set adapted therefor.
  • various known four-channel stereophonic sound transmission systems generally are divided into two classes: one being called a discrete system in which four-route sound signals are independently recorded or broadcasted and regenerated, and the other being called a matrix system in which fourroute signals are combined by an encoder into two channel components and thereafter the two combined sound signals are regenerated by supplying them to a matrix device whereby reproduced sounds may have characters like those possessed when raw sounds were picked up to thereby provide for the effect that sounds are properly oriented and for the feeling of presence.
  • the discrete system four channel FM stereophonic broadcasting system that employs main channel, first sub-channel, and second sub-channel domains is currently experimentally in operation by one broadcasting station in the U.S.A. (called the Dorren system), and it appears certain that the above discrete system fourchannel stereophonic broadcasting will spread hereafter.
  • the matrix system of fourchannel stereophonic broadcasting now in practice, transmits four sound signals of the four-channel stereophonic information after they are encoded into the form of two composite signals by means of the main channel and first sub-channel domains.
  • radio receiver sets are currently manufactured and sold that include a decoder and four amplifiers to receive the matrix system four-channel stereophonic radio wave and regenerate the four-channel stereophonic sounds.
  • a novel four-channel stereophonic broadcasting method which utilizes an FM broadcasting wave of the pilot tone system that utilizes a main channel domain and a first sub-channel domain, as well known in the art.
  • the present stereophonic broadcasting method provides additionally a second sub-channel domain to permit transmission and regeneration of the matrix system four-channel stereophonic information as well as the discrete system four-channel stereophonic inform ation.
  • the main channel domain carries all signals of the four-channel stereophonic information.
  • the first sub-channel domain carries signal components from which two composite signals can be derived by combining the signal components with the signals included in the main channel domains.
  • the two composite signals may be produced by encoding the four signals of the matrix system four-channel stereophonic information.
  • the second sub-channel domain carries signal components from which the signals of the discrete system four-channel stereophonic information can be derived by combining the signal components with the signals of the main channel domain and the first sub-channel domain.
  • the present invention provides further a discrete system four-channel stereophonic receiver set and a discrete system fourchannel stereophonic adapter to be used in conjunction with a conventional stereophonic receiver of the matrix system four-channel type.
  • the instant receiver has variety in internal structure as will become clear as description proceeds.
  • FIGS. 1, 4, 7 and 10 are frequency spectrum diagrams of multiplex signals employable in the present invention.
  • FIGS. 2, 5, 8 and 11 are vector diagrams of signal components frequency-modulated in the domains of main channel, first sub-channel and second subchannel, corresponding to the frequency spectrum diagrams of FIGS. 1, 4, 7 and 10, respectively;
  • FIGS. 3, 6, 9 and 12 are explanatory schematic diagrams showing decoder matrix sections of receivers according to the present invention, corresponding to FIGS. 2, 5, 8 and 11, respectively.
  • FIG. 1 is a frequency spectrum diagram of a multiplex signal employable in the present invention.
  • a first signal MI is employed directly as a main channel component
  • a second signal S1 is converted to a carrier suppressed AM double-sideband signal with the center fre quency of 38 KHz and employed as a first sub-channel component
  • third and fourth signals S2 and S3 are converted through quadrature modulation to a carrier suppressed AM double-sideband signal with the center frequency of such as 76 KHz and employed as a second sub-channel component.
  • the three above channel components are together frequency modulated onto a carrier in the VHF band.
  • the I) KI-lz signal shown in the drawing is a so-called pilot carrier.
  • the signal group consisting of signals M1 and SI and the pilot carrier corresponds to the signal arrangement according to the so-called pilot tone system which provides the standard FM broadcasting radio wave now widely employed throughout the world.
  • FIG. 2 is a vector diagram of signal components Ml, S1, S2 and S3 shown in FIG. I. It will be understood that. if the composite signal shown in FIG. I is received and regenerated by a monaural receiver, only the signal M l is extracted and, because the signal MI includes all signal components which are to be oriented on leftfront (L right-front (R left-back (L and rightback (R sides, respectively, as appreciated from the vector diagram. music can be enjoyed by use of the monaural receiver without an artificial feeling. Further, in the case where the signal is received by a conventional FM stereo receiver, signals S4 and S5 can be derived from the signals M1 and S1 through a matrix device MTl including a phase inverter Pl of a receiver. as shown in FIG. 3. Because the signals S4 and S5 include chiefly signal components which are to be oriented on left and right sides, respectively, they can be employed directly as two-channel sound signals.
  • the matrices operate in an apparent manner in view of the drawings. Matrix MTI will be explained in detail. The other matrices operate in the same manner.
  • MTl has two inputs and two outputs. The first and second inputs receive the M1 and SI signals, respectively. The first output is the vector sum of M1 and S1. As shown at S4, the vector sum results in cancellation of R and reinforcement of L The second output is the vector sum of M1 and SI inverted. As shown at SS, the vector sum results in cancellation of L,- and reinforcement of R
  • the two above signal components (S4 and S5) correspond to composite signals produced by encoding four signals into two, and this feature of signal encoding process is called a CBS or SO system developed by Columbia Broadcasting System Incorp.. U.S.A.
  • the matrix system four-channel stereophonic sound field can be produced.
  • Signals S2 and S3 shown in vector representation in FIG. 2 are obtained by demodulating the second subchannel signal component as broadcasted.
  • signals S8 and S9 are obtained by applying the signal M] of the main channel and one signal S2 included in the second sub-channel to a matrix device MT3 including a phase inverter Pl.
  • Signals S10 and 811 are obtained through matrix operation by applying the signal S1 of the first sub-channel and the other signal S3 included in the second sub-channel to a matrix device MT4 including a phase inverter PI.
  • the signals S8 and S10 are processed by a matrix device MTS including a phase inverter PI to obtain signals S12 and S13
  • the signals S9 and 811 are processed by a matrix device MT6 including 45 and +45 phase shifters and a phase inverter PI to obtain signals S14 and S15.
  • the signals S12 through S15 have no crosstalk therebetween but the same phase relationship, so that by applying these signals to corresponding loudspeakers positioned on left-front, right-front, left-back and right-back sides around a hearer, the discrete system four-channel stereophonic sound field can be pro prised.
  • pre-consideration is given in designing the decoder so that the structures of matrix devices MT5 and MT6 correspond to those of matrix devices MTI and MT2, respectively, which serve to generate the signals S4 through S7 of the matrix system four-channel stereophonic information. Therefore, in case a user possesses a decoder or receiver of the matrix system type, it is possible to regenerate the discrete system four-channel stereophonic sound output by attaching a circuit device capable of processing the second sub-channel component to obtain the signals S8 through S1 1, as an adapter to the conventional receiver, while operating simultaneously the matrix devices MT] and MT2 originally included in the receiver, this being one of the advantages of the present invention.
  • FIGS. 4 through 6 show a second embodiment of the present invention wherein, while the same modulated signal as that of the first embodiment is employed, the combination of matrix devices to form the decoder differs from the arrangement of matrix devices of the first embodiment. That is, the signals M1 and S1 shown in FIG. 5 are applied to the matrix device MTI including the phase inverter Pl to obtain the signals S4 and S5 which can be directly employed as the two channel stereophonic sound signals, as described in connection with the first embodiment.
  • the signals S4 and S5 of the second embodiment are applied to a matrix device MT7 including phase shifters to obtain signals S7 and S6. and the latter signal S6 is then applied to a phase inverter PI to obtain the signal S6.
  • the right hand half of the circuit shown in FIG. 6 is for obtaining the discrete system four-channel stereophonic sounds by use of the second sub-channel signal component. That is, signals S16 and S17 are obtained by applying the signals S2 and S3 to a matrix device MTS for matrix processing.
  • a carrier signal to be added in demodulating the second sub-channel component is phase shifted a 45, the signals S16 and S17 can be obtained directly as demodulation signals, thus, the above provision obviates the use of the matrix device MTS.
  • the signals S4 and S16 are applied to a matrix device MT9 including a phase inverter F1 for matrixing to produce signals S18 and S19 and, then, the signals S5 and S17 are applied to a matrix device MT including a phase inverter Pl for matrixing to produce signals S20 and S21. Thereafter, the signals S19 and S21 are applied to a matrix device MTll including a 90 phase shifters for matrixing to produce signals S22 and S23, and the latter S23 is processed by a phase inverter Pl to produce a signal S23.
  • the discrete system four-channel stereophonic sounds can be regenerated and heard.
  • FIGS. 7 through 9 show a third embodiment of the present invention utilizing the same frequency spectrum feature as that employed in the foregoing embodiments.
  • a signal M2 is a composite monaural signal including four signals with a weight put upon front signal components, thus, by regenerating this composite signal, a natural monaural sound can be heard.
  • This main signal M2 and a signal S24 in the first sub-channel are processed by the matrix device MT] included in the conventional receiver to produce signals S27 and S28.
  • the obtained signals S27 and S28 have signal components whose majority portions are to be oriented on left and right sides, respectively, thus, by use of these two signals without modification the two-channel stereophonic sounds can be heard.
  • the two above signal components correspond to two composite signals produced by encoding four channel signals; this latter feature was proposed by Peter Scheiber, U.S.A., and is called the Scheiber system. Accordingly, by use of a matrix device MT12, including attenuators each with the attenuation coefficient of0.4l4 and phase inverters Pl, four signals 829 through S32 can be derived from the signals S27 and S28.
  • the four signals S29 through S32 permit hearing of substantially properly oriented four-channel stereophonic sounds as they are applied to loudspeakers, while a little crosstalk effect will remain in the view point of the matrix system four-channel stereophonic information.
  • Signals S and S26 included in the second subchannel in an FM mode are, after demodulation, applied to a matrix device MT13, including phase inverters Pl, through respective attenuators each with the attentuation coefficient of 0.828, shown in rectangular block X828?
  • the matrix device MTl3 receiving also the signals S29 through S32 generates signals S33 through $36.
  • the resulting signals S33 through S36 are in turn processed by a matrix device MTl4 including X.414 attenuators and phase inverters P1 to obtain four independent sound signals S37 through S40.
  • FIGSv 10 through 12 show a fourth embodiment of the present invention which is designed so that the discrete system four-channel stereophonic signals are directly obtained, contrary to the above third embodiment where the matrix system four-channel signals are additionally produced.
  • the main channel signal M2 and the first sub-channel signal S24 are matrixprocessed by the matrix device MTl to obtain the signals S27 and S28 as is the case of the third embodiment; however, in this fourth embodiment, the signals S25 and S26 obtained from the second sub-channel are combined at a matrix device MT15 together with the signals S27 and S28 to generate signals S41 through S44. Because these signals S41 through S44 include a little crosstalk component each, the signals S25 and S26 after being phase inverted are added at a next matrix device MT16 in order to cancel the crosstalk components.
  • the broadcasting method and receiver set of the present invention are not to be limited only to the specific features described hereinabove and illustrated in the drawings.
  • the set of various signal components that are to be frequency modulated through the main channel, first sub-channel and second sub-channel domains should not be limited to those sets which have the foregoing specific vector relationships.
  • the requirements which are to be satisfied in the pres ent invention are that: the main channel domain includes at least four signal components of the four channel routes; the first sub-channel domain includes signal components from which two composite signals that may be produced by encoding four signals of the matrix system four-channel stereophonic information can be derived through combining them with the signals included in the main channel domain; and the second sub-channel domain includes signal components from which the discrete system four-channel stereophonic 'sound signals can be derived through combining them with the signals included in the main channel and first sub-channel domains. Therefore, so far as the above requirements are fulfilled, various signal components in various relative
  • demodulating means were constructed by matrix circuits in the illustrated embodiments, they can also be realized by use of switching (time-dividing) means as is the case of the pilot tone system stereophonic receiver.
  • a discrete system four-channel stereophonic receiver adapted to receive a four-channel stereophonic frequency modulated wave of the following format:
  • a main channel domain having all four signals of fourchannel stereophonic information in said main channel domain, said four signals being designated as R Ly, R and L and comprising a first composite signal in said main channel domain such that the vector representations of said four signals of said first composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in two-dimensional space:
  • R Lp 0 R,, +45 L 35 a first sub-channel domain having all four signals of four-channel stereophonic information in said first sub-channel domain, said four signals comprising a second composite signal in said first sub-channel domain such that the vector representations of said four signals of said second composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in twodimensional space:
  • a second sub-channel domain having all four signals of four-channel stereophonic information in said second sub-channel domain, said four signals comprising third and fourth composite signals in said second sub-channel domain such that the vector representations composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in two-dimensional space:
  • said discrete system four-channel stereophonic receiver comprising:
  • a discrete system four-channel stereophonic receiver adapted to receive a four-channel stereophonic frequency modulated wave of the following format:
  • a main channel domain having all four signals offourchannel stereophonic information in said main channel domain, said four signals being designated as R,-, L,-, R and L and comprising a first com pos' ite signal in said main channel domain such that the vector representations of said four signals of said first composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in two-dimensional space:
  • a first sub-channel domain having all four signals of four-channel stereophonic information in said first sub-channel domain, said four signals comprising a second composite signal in said first sub-channel domain such that the vector representations of said four signals of said second composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in twodimensional space:
  • a second sub-channel domain having all four signals of four-channel stereophonic information in said second sub-channel domain, said four signals comprising third and fourth composite signals in said second sub-channel domain such that the vector representations of said four signals of said third composite signal are of equal magnitudes and have the following angular displacements from the positive x-axis in two-dimensional space:
  • said discrete system four-channel stereophonic receiver comprising:
  • a discrete system four-channel stereophonic receiver as recited in claim 3 wherein said combining means comprises:
  • a discrete system four-channel stereophonic receiver adapted to receive a four-channel stereophonic frequency modulated wave of the following format:
  • a main channel domain having all four signals of fourchannel stereophonic information in said main channel domain, said four signals being designated a R,-, L,-, R,, and L and comprising a first composite signal in said main channel domain such that the vector representations of said four signals of said first composite signal have the following relative magnitudes and angular displacements from the positive x-axis in two-dimensional space:
  • first sub-channel domain having all four signals of four-channel stereophonic information in said first sub-channel domain, said four signals comprising a second composite signal in said first sub-channel domain such that the vector representations of said four signals of said second composite signal have the following relative magnitudes and angular displacements from the positive x-axis in twodimensional space:
  • a second sub-channel domain having all four signals of four-channel stereophonic information in said second sub-channel domain, said four signals comprising third and fourth composite signals in said second sub-channel domain such that the vector representations of said signals comprising said third composite signal have the following relative magnitudes and angular displacements from the positive x-axis in two-dimensional space:
  • said discrete system four-channel stereophonic receiver comprising:
  • a discrete systen four-channel stereophonic receiver adapted to receive a four-channel stereophonic frequency modulated wave of the following format:
  • a main channel domain having all four signals of fourchannel stereophonic information in said main channel domain, said four signals being designated as R Ly, R and L and comprising a first composite signal in said main channel domain such that the vector representations of said four signals of said first composite signal have the following relative magnitudes and angular displacements from the positive x-axis in two-dimensional space:
  • first sub-channel domain having all four signals of four-channel stereophonic information in said first sub-channel domain, said four signals comprising a second composite signal in said first sub-channel domain such that the vector representations of said four signals of said second composite signal have the following relative magnitudes and angular displacements from the positive x-axis in twodimensional space:
  • a second sub-channel domain having all four signals of four-channel stereophonic information in said second sub-channel domain, said four signals comprising third and fourth composite signals in said second sub-channel domain such that the vector representations of said signals comprising said third composite signal have the following relative magnitudes and angular displacements from the positive x-axis in two-dimensional space:
  • said discrete system four-channel stereophonic receiver comprising:
  • fourth, fifth and sixth composite signals to generate seventh, eighth, ninth and tenth composite signals each consisting of a different combination of three of said four signals of four-channel stereophonic information

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  • Stereo-Broadcasting Methods (AREA)
US364476A 1972-06-06 1973-05-29 Four channel stereophonic broadcasting system and receiving device Expired - Lifetime US3896269A (en)

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JPS59155660U (ja) * 1983-03-31 1984-10-19 日本精機株式会社 帰零式積算計の帰零装置
JPS6410479U (US06312121-20011106-C00033.png) * 1987-07-10 1989-01-19

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708623A (en) * 1970-04-29 1973-01-02 Quadracast Syst Inc Compatible four channel fm system
US3745252A (en) * 1971-02-03 1973-07-10 Columbia Broadcasting Syst Inc Matrixes and decoders for quadruphonic records
US3761628A (en) * 1972-04-13 1973-09-25 Columbia Broadcasting Syst Inc Stereo-quadraphonic matrix system with matrix or discrete sound reproduction capability

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708623A (en) * 1970-04-29 1973-01-02 Quadracast Syst Inc Compatible four channel fm system
US3745252A (en) * 1971-02-03 1973-07-10 Columbia Broadcasting Syst Inc Matrixes and decoders for quadruphonic records
US3761628A (en) * 1972-04-13 1973-09-25 Columbia Broadcasting Syst Inc Stereo-quadraphonic matrix system with matrix or discrete sound reproduction capability

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JPS4917902A (US06312121-20011106-C00033.png) 1974-02-16

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