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A digital radio transmission system for speakers capable of stereophonic audio signal
broadcasting with the quality of the digital compact disc type is provided. A compression means
(104) for a file representing a "compact disc" type acoustic digital signal, a means for converting
the compressed signal into a serial signal transmitted in packets to a quadrature modulation
circuit (101), and A transmitter (10) including means for sending the signal from the phase
modulation circuit to the indoor feed network, and connected to the indoor feed network to
transmit an acoustic digital signal from the signal sent from the quadrature demodulator (111)
Receiver (11) including means for extracting the information packet and converting it to a
parallel digital signal and sending it to the decompression circuit (115), and the decompressed
digital signal to the loudspeaker after appropriate amplification And means for converting to an
analog signal to supply. [Selected figure] Figure 1
Digital transmission system for speakers
The present invention relates to a digital wireless transmission system for speakers.
A wireless speaker system is known which converts an analog audio signal into a frequency
modulation signal and transmits the frequency modulation signal through an alternating current
supply line of an indoor network.
From the signal received by the indoor network, a frequency modulated signal is extracted and
reconverted to an acoustic signal.
Such techniques are specifically disclosed in US Pat. No. 4,829,570. The patent further discusses
the use of a compression device to enable compression of the analog signal sent from a compact
disk reader, but its dynamic range is wide enough to allow frequency modulation transmission.
Require a wide pass frequency band. Although such a wide pass frequency band and large
displacement cause many problems, this patent solves these problems by using a compression
circuit that reduces the overall dynamic range of the acoustic signal. There is. The first problem
already recognized in this document is that stereophonic systems operating with analog systems,
such as variable frequency oscillators, in particular with frequency modulation, are constrained.
When moving from the quality of a simple stereophonic sound to the quality of a "digital CD"
type stereophonic sound, the quality of the information to be transmitted is limited by the
frequency modulation by the passband.
Furthermore, although this type of system disclosed in U.S. Pat. No. 4,829,570 is acceptable for
personal purposes in the indoor network of private homes, it is difficult to install in buildings,
much less in commercial parks and commercial centers. It is even more difficult.
In fact, the music played on the supply network is picked up at the same moment by all the
speakers installed and connected to this network. Since this raises the issue of royalty payments,
it is desirable to have a device that can avoid public broadcasts.
Moreover, such devices must have a first carrier frequency for the first channel and a second
carrier frequency for the second channel in order to have two stereophonic channels. These
carrier frequencies have to be chosen according to very specific conditions, which likewise limits
the different possibilities of the passband.
U.S. Pat. No. 4,829,570
A first object of the present invention is to propose a digital radio transmission for stereophonic
audio signal broadcasting and / or remotely controllable loudspeakers with the quality of the
digital compact disc type.
The first object of the present invention is to compress a file representing a "compact disc" type
acoustic digital signal, to convert the compressed signal to a serial signal transmitted to a
plurality of packets to a quadrature modulation circuit, and to a quadrature modulation circuit. A
transmitter including means for sending a signal from the receiver to an indoor feed network,
and extracting an information packet that is connected to the indoor feed network and carries an
acoustic digital signal from the feed signal sent from the quadrature demodulator; A receiver
comprising means for converting it into parallel bit digital signals and sending them towards the
decompression circuit, and converting the decompressed digital signals into analog signals to be
supplied to the loudspeaker after appropriate amplification And a digital wireless transmission
system for speakers, including:
The second object is to enable transmission of a plurality of music signals to various speakers.
The purpose of this is that the parallel-to-serial conversion means includes means for inserting
the destination address in the signal packet converted to serial bits, and the receiving means is an
address unique to the receiving device to which the speaker is connected and within the
receiving packet. Is achieved by including means for comparing with the addresses described in.
According to another feature, the serial to parallel conversion device comprises means for
multiplexing a plurality of digital file frames representing different acoustic signals addressed to
different addresses.
Another object of the present invention is to propose a system that makes royalty royalty fraud
This third object is achieved by the transmitting circuit including an encryption circuit and the
connected receiving device including a decryption circuit using a secret key stored in the
memory of the parallel-to-serial conversion cancellation circuit. .
According to another feature, the information of the digital signal comprises a first part
constituting the protocol information, a second part constituting the address of the recipient, and
one digital signal or a plurality of multiplexed digital signals. Parallel-to-serial conversion is
performed according to one protocol including a third part that configures a signal and a fourth
part that configures protocol termination information.
According to still other features, the protocol includes a fifth portion that configures control
information of the speaker.
According to another feature, the protocol comprises a sixth part which constitutes at least one
cryptographic key.
According to yet another feature, the system includes means for placing control commands in the
serial signal transmitted on a packet-by-packet basis that allow individual adjustment of each
According to still another feature, the system comprises means for converting an analog signal to
a digital signal, disposed before the means for compressing the file representing the acoustic
signal, if the acoustic signal to be transmitted is of analog type.
Other features and advantages of the present invention will become more apparent as the
following description is read in conjunction with the accompanying drawings.
FIG. 1 is a schematic view of an electronic circuit embodying the present invention.
FIG. 1 is a schematic view of a “jukebox” type audiovisual device using the system of the
present invention.
The invention will now be described with reference to FIG. 1 in which two leads (13) of an indoor
electrical energy supply network, such as a building or place for accepting public or corporate
bodies, for example bars, department stores, stadiums etc., are shown.
Connected to this feed network is a transmitter (10) comprising a primary coil of a first
transformer (108).
The first transformer (108) sends a power signal to the power supply circuit (100) by the second
coil via the diode rectification circuit, and the power supply circuit (100) transmits from the
rectified sector of the AC signal Extract voltage signals necessary to supply power to various
circuits of the device.
In parallel thereto, a second transformer (109) is connected to the primary coil of this first
transformer (108).
A signal is supplied from the quadrature modulation circuit (101) to the secondary coil of the
second transformer (109) via the transistor.
The quadrature modulation circuit (101) is supplied with a voltage by the power supply circuit
(100), and data packets (P1, P2) representing digital information parallel / serial converted from
the microcontroller (102) according to a protocol (P) described later. Receive the flow of).
This protocol (P) comprises a first part (IP) that constitutes the protocol information, a second
part (AD) that constitutes the address of one recipient or each of a plurality of recipients, and the
control of the loudspeaker A third part (IC) constituting information, a fourth part (CE) each
constituting one or more encryption keys for one address, and each signal associated with one of
the addresses of the recipient And a fifth portion (SNA) that constitutes an acoustic digital signal
or a multiplexed acoustic signal, and a sixth portion (IFP) that constitutes protocol termination
The signal is quadrature modulated by a quadrature modulation circuit (101) with a carrier that
is between 200 and 300 kHz and is superimposed on the AC signal sector via a transformer
The acoustic digital signal sent from the acoustic source occupies, after compression, a digital
transmission of 128 kilobits per second and is processed by the microcontroller (102) and sent
as a continuous packet according to the above mentioned protocol (EP).
The program of the microcontroller (102) can be configured to perform multiplexing of multiple
sound sources.
Each program has a unique address and a unique decryption key, so it is possible to send jazz
music songs to the second speaker at the same moment, for example, while sending classical
music songs to the first speaker.
In this case, the transmitting device (10) sends one or more frames to the user identified by the
card or case (11) connected to the speaker.
The transmitting device (10) and the one or more receiving devices (11) are connected to one
another only via conductive lines or an indoor feed network.
Furthermore, when the operation program of the microcontroller (102) receives, for example, the
command transmitted by the remote control case (12) transmitting the radio wave signal to the
pickup (1020), the command generated by the case (12) is contained in the packet. Can be
configured to configure the control information of the speaker.
These control information allow individual adjustment of each speaker by adjusting the right side
channel, left side channel, bass, treble, volume and the like.
If you want to protect the audio information transmitted on the indoor network so that people
who can not collect copyright fees can not listen to the same song while enabling the collection
of copyright royalty, encryption circuit (103 ) And place it between the compression circuit (104)
and the microcontroller (102).
If the music signal source is not of the "digital" type, an AD converter (106) is added to the device
which receives the output signal of the analog amplifier (107) at the input.
An analog amplifier (107) receives an analog sound signal.
The receiver (11) comprises a first transformer (118) as described above.
The first transformer (118) supplies a power supply circuit (110) for generating power supply
signals necessary for the operation of various circuits of the receiver (11) using a rectifier circuit.
The second transformer (119) connected to the primary coil of the first transformer uses the
decoupling capacitance to feed the quadrature demodulator (111), which in turn is the protocol
signal And a protocol packet as a serial output to the microcontroller (112), the microcontroller
(112) converts these serial signals into parallel signals for the decryption circuit (113), the
output of the decryption circuit (113) Are connected to the decompression circuit (114). The
output of the decompression circuit (114) is connected to the DA converter circuit (115), and the
output of the DA converter circuit is connected to the speaker (HP). The decompression circuit
(114) uses an "MPEG" 3 type algorithm, and the encryption circuit (103) and the decryption
circuit (113) use an "MMPP" (MultiMedia Protection Protocol) type algorithm.
The memory of the microcontroller (112) of the case (11) stores the identification address,
thereby comparing the address received in the packet with the identification address, and
whether the acoustic digital information is addressed to the speaker or the other speaker It can
identify the address. Similarly, the microcontroller's memory stores decryption keys at
initialization or manufacturing. The storage of the decryption key on initialization can be
implemented by the fourth zone of the protocol.
The AD conversion circuit (CAN / CNA), compression circuit, encryption circuit, and amplification
circuit of the transmission device (10) may be, for example, a digital signal processor
commercialized by Motorola, Inc. under product number 563XX, commonly called "D.S. (Digital
Signal Processor).
Similarly, the decryption circuit, the decompression circuit, and the DA conversion circuit of the
receiving apparatus (11) are digital signal processors commercialized by Motorola, Inc. under the
product number 563XX, commonly called "DSP" (Digital Signal Processor). Can be composed of
By using such a device, it is possible to install various speakers in various places while supplying
the same phase signal of the network to which the transmission device (10) is connected to the
This transmission device (10) is connected on the one hand to an acoustic signal source.
This acoustic signal source is, for example, the digital output of a compact disc reader, or a
jukebox hard disk as described in FIG. 2, corresponding to the PCT application FR-A 9501333
(publication number WO 96/12596) Digital output. The transmission device (10) is, on the other
hand, connected to the conductors of the power supply network of the building or site. The
jukebox in FIG. 2 is composed of a microprocessor (CPU) (1) which is a system compatible with a
high-performance PC. In the present embodiment, the "Intel 80486 DX / 2" type system is used.
This system has the following memory means and features. Compatibility with VESA local bus
Cache memory of processor: 245 kbytes High-performance serial port and parallel port SVGA
type graphical adapter microprocessor SCSI / 2 type bus controller Self refresh static RAM
In the present invention, all other CPUs with equal or higher performance can be used.
The CPU controls and manages the sound control circuit (5), the remote communication control
circuit (4), the input control circuit (3), the large capacity storage control circuit (2), and the
control circuit (6) of the display means.
A video monitor (62) mainly comprising display means has a non-interlaced 14-pos (35 × 56
cm) flat screen of high resolution and low radiation, and SVGA standard. It is this monitor that is
used for image playback of graphics or video clips (for example, a cover of a song selection
Mass storage means (21) using high speed and high capacity "SCSI" type hard disks are
connected to storage means already present in the microprocessor unit. This storage means
stores digitized and compressed audio-audio visual information.
A high speed communication modem adapter (41) with a data transfer rate of 28, 8 kbps is
incorporated to allow connection with an audiovisual information supply network controlled by a
central server.
In order to reproduce the selected audio information, the system comprises a speaker (54)
receiving an amplifier-tuner signal (53) connected to a "music synthesizer" type electronic circuit
This electronic circuit (5) is configured to support a large number of input sources, and for
example, Creative Labs Inc.'s "" which added two memory buffers (56, 57) for the purpose
described later. The sound blaster card "SBP 32 AWE type", such as a multimedia acoustic
adapter microprocessor, provides an output with "CD (compact disc)" type quality.
Similarly, the control circuit of the display means comprises two buffer memories (66, 67) for the
purpose to be described later.
The power supply to the system is adjusted to 240 watts by cooling.
Such a supply is protected against over current and over amplitude.
The audiovisual reproduction system manages Elo Touch Systems Inc's 14-pos (35 × 56 cm)
touch screen “Intelli-Touch” (33) through the input monitoring circuit (3). The touch screen
includes a glass coated panel utilizing "advanced surface wave technology" and an "AT" type bus
controller. This touch screen can display various selection information used by the user as well as
control information and management monitoring information used by the system administrator
or owner on the screen of the video monitor (62) or the television (61). . The screen is also used
to maintain the connection with the external keyboard (34) connectable to the system, and
therefore has a keyboard connector managed by the key lock (32) via the interface circuit (3).
The input interface circuit (3) is a transmitter with, for example, 15 control keys for the
microprocessor system and 8 keys for the projection device, infrared remote control from Mind
Path Technologies Inc. It is also connected to a remote control system (31), which consists of the
device and an infrared receiver with serial adapter from Mind Path Technologies Inc.
In addition, the royalty payment device (35) of National Rejector Inc. is also connected to the
input interface circuit (3).
In addition, coins, bills, coins, magnetic cards, IC cards or any other device which enables the
reception of any payment scheme by combination of various payment means can be used.
In order to accommodate the system, it is provided with a steel plate frame or chassis which
allows external devices to be personalized.
In addition to these elements, a wireless microphone (55) is connected to the sound control
circuit (5), which can be converted into a high power public information guidance system or
possibly a karaoke machine.
This system is also available with a wireless speaker system.
The remote control device (31) enables, for example, the administrator who is behind the counter
to access and monitor various commands as follows. Microphone activation-stop command
Command to reduce the speaker sound Volume control command A command to cancel the song
selection while listening.
The two buffers (56, 57) are connected to the sound control circuit (5), and can alternately store
information corresponding to a quarter second sound. Similarly, two buffers (66, 67) are
connected to the video control circuit (6), and can alternately store 1/10 second images.
Furthermore, each buffer (46, 36, 26) is connected to each of the communication control circuit,
the input interface circuit (3), and the storage circuit (2).
The digitized and compressed audiovisual data are stored in the storage means (21).
These pieces of information are transmitted via the CPU (1) to the card (105) to which the
element corresponding to the transmitting device (10) is added.
The encryption circuit (103) avoids the encryption circuit (103) to prevent the first connector
(1021) when the information is already compressed, or when the information is already
encrypted or does not need to be encrypted. And, when the information needs to be encrypted, it
is directly connected to the buffer circuit (56, 57) by a second connector (1031) using an
encryption circuit (103). If the information is not compressed, the buffer (56, 57) is connected to
the third connector (1041) to use the compression circuit.
In this way, by connecting the output of the transformer (108) to the sectors, by connecting the
receiver circuits (11) at various locations to the sectors, the speakers usually provided in the
jukebox system (54) In addition, the signal can be supplied to various long distance speakers.
This allows the administrator to adjust the volume according to the installation place or the
configuration of the speaker, and at the same time, enables sound broadcasting of appropriate
quality in various places.
If the invention is used in other devices such as a compact disc reader, a radio to receive a special
channel, it can be equipped with a payment device using any of the payment means for
jukeboxes described above. Such payment devices, like those for jukeboxes, enable the device to
operate for the duration specified for the fee only if the fee is paid. This duration is determined
by the clock connected to the receiver.
Other modifications obvious to one skilled in the art are likewise part of the invention.
DESCRIPTION OF SYMBOLS 1 CPU 2 Large capacity storage control circuit 3 Input control
circuit 4 Remote communication control circuit 5 Sound control circuit 6 Display control circuit
10 Transmitter 11 Receiver 12 Remote control case 21 Storage 26, 36, 46, 56, 57 66, 67 buffer
33 touch screen 34 external keyboard 35 charge payment device 41 communication modem
adapter 54 speaker or juke box 55 microphone 62 video monitor 100 power supply circuit 101
quadrature modulation circuit 102, 112 microcontroller 103 encryption circuit 104 compression
circuit 107 Analog amplifier 108, 118 First transformer 109, 119 Second transformer 111
Demodulation circuit 113 Decryption circuit 114 Decompression circuit 115 DA conversion
circuit 116 Amplifier 119 Quadrature phase demodulation circuit 1020 pick up
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