JP6494018B2 - Transmission apparatus and transmission system - Google Patents

Description

  The present invention relates to a transmission apparatus and a transmission system.

  Conventionally, a GPS clock is generated based on the GPS time received by a GPS receiver from a GPS satellite, and a unique word (UW) of a call signal received from a central base station is detected by a UW detection unit. The phase delay time until the GPS clock is generated is detected by the phase delay detector, and the read address on the DPRAM in the phase delay corrector corresponding to the phase delay time is changed by the delay address generator, thereby calling the call signal from the DPRAM. An invention of a peripheral base station in which the timing of reading out is adjusted so that the next GPS clock is generated and a synchronization method therefor is disclosed (for example, see Patent Document 1).

JP-A-8-307929

The above-described conventional technology is configured such that the central base station as a transmission unit and the peripheral base station as a reception unit are synchronized by receiving GPS signals from GPS satellites.
An object of the present invention is to obtain a synchronization signal of a transmission unit even in a reception unit by receiving a GPS signal from, for example, a GPS satellite as an auxiliary input signal in which only the transmission unit is asynchronous with the system.

  The transmission system of the present invention is a system in which a transmission unit and a reception unit transmit main data via a transmission line, and the transmission unit uses phase data generated from an auxiliary input signal that is asynchronous with the system as main data. The reception unit receives the signal transmitted from the transmission unit, and separates main data and phase data from the received signal.

  The transmission system of the present invention is a system in which a transmission unit and a reception unit transmit main data via a transmission line, and the transmission unit receives phase data generated from an auxiliary input signal that is asynchronous with the system. The main data is multiplexed and transmitted to the receiving unit, the receiving unit receives the signal transmitted from the transmitting unit, compares the phase data from the transmitting unit in the received signal with the phase data of the receiving unit, It is characterized in that a receiving side reproduction unit that performs control so that the compared difference becomes the same is mounted.

  The transmission system of the present invention is a wireless transmission system in which a transmission unit and a reception unit transmit audio data via radio, and the transmission unit generates a phase generated from an auxiliary input signal received from a GPS satellite by a GPS receiver. Data is inserted into audio data and transmitted to a receiving unit, and the receiving unit receives a signal transmitted from the transmitting unit, and separates audio data and phase data from the received signal.

  The transmission system of the present invention is the above-described wireless transmission system, wherein the phase data is a sample value sampled from the auxiliary input signal.

  Furthermore, the transmission device of the present invention is a transmission device that transmits audio data from a transmission unit via radio, and the transmission unit converts phase data generated from an auxiliary input signal received from a GPS satellite by a GPS receiver into audio data. It inserts in and transmits.

  According to the present invention, only the transmitting unit receives a GPS signal from, for example, a GPS satellite as an auxiliary input signal, so that the receiving unit can also obtain the synchronization signal of the transmitting unit.

It is a block diagram for demonstrating the radio | wireless transmission system which concerns on one Example of this invention. It is a figure for demonstrating digital audio | voice input data. It is a figure for demonstrating a timing extraction part. It is a timing chart for demonstrating operation | movement of a timing extraction part. It is a block diagram for demonstrating the GEN part which concerns on one Example of this invention. 4 is a timing chart for explaining an operation of a GEN unit according to an embodiment of the present invention. It is a block diagram for demonstrating the MUX part which concerns on one Example of this invention. It is a timing chart for demonstrating operation | movement of the MUX part which concerns on one Example of this invention. It is a block diagram for demonstrating the GEN part which concerns on other one Example of this invention. It is a timing chart for demonstrating operation | movement of the GEN part which concerns on another Example of this invention. It is a block diagram for demonstrating the GEN part which concerns on another one Example of this invention. It is a timing chart for demonstrating operation | movement of the GEN part which concerns on another one Example of this invention. It is a block diagram for demonstrating the REGEN part which concerns on one Example of this invention. 4 is a timing chart for explaining an operation of a REGEN unit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The embodiment of the present invention relates to an STL (Studio to Transmitter Link), and for example, transmits audio data as main data from a broadcasting station to a transmitting station via radio.
FIG. 1 is a block diagram for explaining a radio transmission system according to an embodiment of the present invention.
In FIG. 1, the wireless transmission system mainly includes an STL-T (Studio to Transmitter Link-Transmitter) 110 that is a transmitter and an STL-R (Studio to Transmitter Link-Receiver) 120 that is a receiver. Audio data is transmitted via

The STL-T 110 includes a timing extraction unit 111, an audio ENC (Encoder) unit 112, a GEN (Generator) unit 113, a MUX (Multiplex) unit 114, a MOD (Modulator) unit 115, and a timing CNT-T (Controller-Transmitter) unit 116. It consists of
The STL-R 120 includes a DEMOD (Demodulator) unit 121, a timing extraction unit 122, a DEMUX (Demultiplex) unit 123, an audio DEC (Decoder) unit 124, a REGEN (Regenerator) unit 125, and a timing CNT-R (Controller-Receiver) unit 126. It consists of

In STL-T110, the timing extraction unit 111 extracts the input CK from the input digital audio input data, and outputs the extracted input CK to the timing CNT-T unit 116.
The timing CNT-T unit 116 generates t1, t2, t3, and t4 from the input CK input to IN.

The audio ENC unit 112 compresses the input digital audio input data using, for example, an MP3 (MPEG-1 Audio Layer-3) file or a subband ADPCM (Adaptive differential Pulse code modulation) format using t1. Data Dt (for example, 384 kbps) is output to the MUX unit 114.
As the auxiliary input, a signal transmitted from a GPS (Global Positioning System) satellite (not shown) is received by a GPS receiver (not shown), and a signal generated by the GPS receiver from the received signal is 1 pps (1 Hz). .
The GEN unit 113 converts the input auxiliary input signal into a sawtooth wave, and outputs the sample value sub (for example, 20 kbps) taken from the sawtooth wave at t2 to the MUX unit 114.

The MUX unit 114 takes in the audio compression data Dt (for example, 384 kbps) at t3, inserts a sample value sub (for example, 20 kbps) into the acquired audio compression data Dt, and generates data Dm (for example, 404 kbps). The generated data Dm is output to the MOD unit 115.
The MOD unit 115 adds an error correction code and a demodulation header to the data Dm, modulates at t4, and transmits the radio wave 130 from an antenna not shown. Here, a case where radio waves are transmitted from an antenna has been described, but a wired or other transmission path may also be used. The modulation method is, for example, 64QAM (64 Quadrature Amplitude Modulation).

The STL-R 120 receives the radio wave 130 from an antenna (not shown) and inputs the received signal to the DEMOD unit 121. Although the case where radio waves are received from an antenna is described here, a wired transmission line or the like may be used.
The DEMOD unit 121 extracts a clock signal from the transmitted signal by the timing extraction unit 122, demodulates the signal transmitted by the extracted clock signal to data Dmr, and outputs the demodulated data Dmr to the DEMUX unit 123 .

Further, the timing extraction unit 122 outputs the extracted clock signal to the timing CNT-R unit 126.
When the clock signal output from the timing extraction unit 122 is input to IN, the timing CNT-R unit 126 generates r1, r2, and r3 from the input clock signal.

The DEMUX unit 123 separates the input data Dmr into data Dt (audio data) and a sample value subr by r1, outputs the data Dt to the audio DEC unit 124, and outputs the sample subr to the REGEN (Regenerator) unit 125. .
The audio DEC unit 124 decompresses the audio compression data Dt input using r2, returns it to digital audio data, and outputs it as digital audio output data.
The REGEN unit 125 outputs an auxiliary output signal that is phase data from the sample value subr output from the DEMUX unit 123.

  With the configuration of FIG. 1, the wireless transmission system inserts phase data generated from 1 pps of the GPS reception signal, which is an auxiliary (input) signal, into the audio data compressed by the STL-T unit 110 which is a transmission unit. By separating the data transmitted to a certain STL-R unit 120 and received by the STL-R unit 120 into audio data and phase data, demodulating the audio data, and returning the phase data to 1 pps of the auxiliary (output) signal, The STL-R unit 120 which is a receiving unit can obtain phase data at the time of transmission of audio data and output it to a subsequent device.

Next, digital audio input data will be described with reference to FIG.
FIG. 2 is a diagram for explaining digital audio input data.
In FIG. 2, the digital audio input data is audio data of the digital audio interface standard AES / EBU (Audio Engineering Society / European Broadcasting Union), for example. The digital audio input data is, for example, digital continuous data with additional information for serial transmission and is net 1.536Mz.
The digital audio input data is compressed by the audio ENC unit 112 into audio compression data Dt.

Next, the timing extraction unit 111 will be described with reference to FIGS.
FIG. 3 is a diagram for explaining the timing extraction unit.
FIG. 4 is a timing chart for explaining the operation of the timing extraction unit.
3 and 4, the timing extraction unit 111 extracts the input CK from the input digital audio input data.
The timing extraction unit 111 can reproduce 1.536 MHz by inputting digital audio input data (AES / EBU) using, for example, AK5385B manufactured by Asahi Kasei Co., Ltd., and outputs 1.536 MHz as an input CK.

Next, the GEN unit 113 will be described with reference to FIGS.
FIG. 5 is a block diagram for explaining a GEN unit according to an embodiment of the present invention.
In FIG. 5, the GEN unit 113 includes a PLL (Phase Locked Loop) unit 501, a VCO (Voltage Controlled Oscillator) unit 502, a counter unit 503, an EQ (Equalizer) detection unit 504, and an FF (Flip-Flop) unit 505. ing.
The GEN unit 113 outputs the sample value sub by inputting the auxiliary input signal and the sample pulse t2.

FIG. 6 is a timing chart for explaining the operation of the GEN unit according to the embodiment of the present invention.
In FIG. 6, the GEN unit 113 inputs the auxiliary input signal (1 pps) to the A input of the PLL unit 501, and the counter unit 503 starts counting from the rising edge of the auxiliary input signal (1 pps). The analog notation of Out (output) of the counter unit 503 is a sawtooth wave.
The auxiliary input signal (1 pps) and the output (output) of the counter unit 503 are synchronized in the PLL unit 501.
The FF unit 505 samples Out (output) of the counter unit 503 with the sample pulse t2 (takes a count value) to obtain a sample value sub. The sample value sub is, for example, value = 2, 10, 18, 5, 13, 21, 8,.
The PLL unit 501 compares the pulse phases of the A input and the B input. If the A input is earlier than the B input, the frequency of the out of the VCO unit 502 is increased. If the A input and the B input are the same (same phase), If the A input is slower than the B input, the out frequency of the VCO unit 502 is lowered.
When the counter unit 503 reaches a predetermined value, the EQ detection unit 504 outputs Out and resets the value of the counter unit 503 to 0.

Next, the MUX unit 114 will be described with reference to FIGS.
FIG. 7 is a block diagram for explaining a MUX unit according to an embodiment of the present invention.
FIG. 8 is a timing chart for explaining the operation of the MUX unit according to an embodiment of the present invention.
In FIG. 7, the MUX unit 114 includes a FIFO (First In First Out) unit 701 and a SELECTER unit 702.
7 and 8, the FIFO unit 701 inputs audio compression data Dt to IN and inputs t3 to RE, and outputs the audio compression data Dt from Out to the SELECTTER unit 702 in synchronization with t3.

The SELECTTER unit 702 inputs the signal Out of the FIFO unit 701 to In-A, and inputs the sub sample value to In-B, whereby the data Dm in which the sample value sub is inserted into the audio compression data Dt in a time division manner. Is generated.
Data Dm includes data string n, sample value sub = 2, data string n + 1, sample value sub = 10, data string n + 2, sample value sub = 18, data string n + 3, sample value sub = 5, data string n + 4, sample value. sub = 13, data string n + 5, sample value sub = 21,...

Next, the REGEN unit 125 will be described with reference to FIGS.
FIG. 13 is a block diagram for explaining a REGEN unit according to an embodiment of the present invention.
In FIG. 13, the REGEN unit 125 includes a PLL unit 1301, a VCO unit 1302, a counter unit 1303, an FF unit 1304, and an EQ detection unit 1305.
The REGEN unit 125 inputs the sample value subr to A of the PLL unit 1301 and inputs the sample pulse r3 to the Set of the FF unit 1304, thereby outputting an auxiliary output of 1 pps (1 Hz) from the Out of the EQ detection unit 1305. Note that the phase data of the signal transmitted from the transmission unit and the phase data of the reception unit are compared, and the PLL unit 1301, the VCO unit 1302, etc., which are the main entities that perform control so that the compared difference is the same, are received on the reception side. This is called a playback unit.

FIG. 14 is a timing chart for explaining the operation of the REGEN unit according to the embodiment of the present invention.
In FIG. 13, the REGEN unit 125 inputs the sample value subr to A of the PLL unit 1301, and inputs the r3 sample pulse to Set of the FF unit 1304, whereby the counter output (Out) of the counter unit 1303 shown in FIG. A sawtooth wave is output from the analog notation, and the EQ detection unit 1305 detects the rising portion (match) of the sawtooth wave, and outputs an auxiliary output of 1 pps (1 Hz).
The PLL unit 1301 compares the value of the multi-valued bit of the input A with the value of the multi-valued bit of the input B. If input A> input B, the PLL unit 1301 changes Out so that the frequency of the VCO unit 1302 is increased. = In the case of input B, Out is maintained so that there is no frequency change of the VCO unit 1302, and in the case of input A <input B, Out is changed so that the frequency of the VCO unit 1302 becomes low.
In transmission, errors may occur very rarely.
Therefore, the PLL unit 1301 may be provided with a function of temporarily stopping the change of the Out value when there is an input that causes a significant difference between the input A and the input B than the previous difference.
The VCO unit 1302 outputs about 10 MHz Out, and the EQ detection unit 1305 outputs Out when the value 10M-1 (9, 999, 999) is input.
Note that α of the sample value subr is the difference between the counter unit 1303 that performs the count-up operation according to the count-up speed of the counter unit 503 in the GEN unit 113 of the STL-T110 and the VCO unit 1302 of the REGEN unit 125 of the STL-R120. It is the notation which showed.

(GEN unit 113b of another embodiment)
Next, a GEN unit 113b which is another embodiment will be described with reference to FIGS.
Note that the GEN unit 113b can be used instead of the GEN unit 113 in FIG.
FIG. 9 is a block diagram for explaining a GEN unit according to another embodiment of the present invention.
In FIG. 9, the GEN unit 113b includes a counter unit 901 and an FF unit 902.
The auxiliary input signal 1 (1 pps) and the auxiliary input signal 2 (10 MHz) are received by a GPS receiver (not shown) transmitted from a GPS satellite (not shown) and generated by the GPS receiver from the received signal. Signal.
The GEN unit 113b inputs the auxiliary input signal 2 (10 MHz) to the CK of the counter unit 901, and inputs the auxiliary input signal 1 (1 pps) to the Reset of the counter unit 901, whereby the sample value sub is output from the Out of the FF unit 902. Is output.

FIG. 10 is a timing chart for explaining the operation of the GEN unit according to another embodiment of the present invention.
In FIG. 10, the GEN unit 113b inputs the auxiliary input signal 1 (1 pps) to Reset of the counter unit 901, and inputs the auxiliary input signal 2 (10 MHz) to CK of the counter unit 901, so that the counter unit 901 counts. To start. The count output which is Out (output) of the counter unit 901 is a sawtooth wave (analog notation).
The auxiliary input signal (1 pps) and the out (output) of the counter unit 901 are synchronized by resetting at the rising edge of the auxiliary input signal (1 pps).
The FF unit 902 samples the Out (output) of the counter unit 901 with the sample pulse t2 (takes the count value), and obtains the sample value sub. The sample value sub is, for example, value = 2, 10, 18, 5, 13, 21, 8,.

(GEN part 113c of still another embodiment)
Next, a GEN unit 113c according to another embodiment will be described with reference to FIGS.
Note that the GEN unit 113c can be used instead of the GEN unit 113 in FIG.
FIG. 11 is a block diagram for explaining a GEN unit according to another embodiment of the present invention.
In FIG. 11, the GEN unit 113 c includes a counter unit 1101, an FF unit 1102, and a value conversion unit 1103.
The auxiliary input signal 1 (1 pps) and the MOD clock are signals generated by a GPS receiver that receives a signal transmitted from a GPS satellite (not shown) by a GPS receiver (not shown).

FIG. 12 is a timing chart for explaining the operation of the GEN unit according to another embodiment of the present invention.
In FIG. 12, the GEN unit 113c inputs an auxiliary input signal (1pps) to Reset of the counter unit 1101, and inputs it to CK of the MOD clock counter unit 1101, whereby the counter unit 1101 starts counting. The count output which is Out (output) of the counter unit 1101 is a sawtooth wave (analog notation).
The auxiliary input signal (1 pps) and the out (output) of the counter unit 1101 are synchronized by resetting at the rising edge of the auxiliary input signal 1 (1 pps).

The FF section 1102 samples the Out (output) of the counter section 1101 with the sample pulse t2 (takes the count value) to obtain the sample value sub0. The sample value sub0 is, for example, value = 4, 20, 36, 10, 26, 42, 16,.
The value conversion unit 1103 receives the output (output) of the FF unit 1102 to obtain a sample value sub. The sample value sub is, for example, value = 2, 10, 18, 5, 13, 21, 8,.

  In the transmission apparatus and the transmission system according to the embodiment of the present invention, only the transmission unit receives a GPS signal from, for example, a GPS satellite as an auxiliary input signal, so that the reception unit can also obtain the synchronization signal of the transmission unit.

Although the present invention has been described in detail above, it is needless to say that the present invention is not limited to the transmission system described herein, and can be widely applied to transmission systems other than those described above.
For example, instead of the radio wave 130, it may be converted into an optical signal and output to a fiber.
Further, in this example, the configuration is shown in which two pieces of information of the voice data Dt corresponding to the main line and the auxiliary input Sub are transmitted, but the present invention is also applicable to the case of transmitting three or more information including data such as contact voice. Is possible.
A signal of 10 MHz or 1 pps is generally a signal output from a GPS controlled rubidium oscillator, but may be a rubidium oscillator without GPS control or a crystal oscillator.
Further, even at a specific frequency, it can be applied to a combination of 74.25 MHz and 60 Hz used for a video signal or the like by setting the value of the EQ detection unit to another value.

  110: STL-T, 111: Timing extraction unit, 112: Audio ENC unit, 113: GEN unit, 114: MUX unit, 115: MOD unit, 116: Timing CNT-T unit, 120: STL-R, 121: DEMOD 122: Timing extraction unit 123: DEMUX unit 124: Audio DEC unit 125: REGEN unit 126: Timing CNT-R unit 130: Radio wave 501: PLL unit 502: VCO unit 503: Counter unit 504: EQ detector, 505: FF, 701: FIFO, 702: SELECTTER, 901: counter, 902: FF, 1101: counter, 1102: FF, 1103: value converter, 1301: PLL unit, 1302: VCO unit, 1303: counter unit, 1304: FF unit, 1305: EQ detection Part.

Claims (5)

A system in which a transmission unit and a reception unit transmit main data via a transmission path,
The transmitter receives digital audio input data as the main data and an auxiliary input signal that is asynchronous with the system, generates a sample pulse from an input clock of the digital audio input data, and rises the auxiliary input signal Is generated as a starting point, the sample value of the sawtooth wave is generated for each sample pulse, the sample value is multiplexed with the main data and transmitted to the receiving unit,
The receiving unit receives a signal transmitted from the transmitting unit, generates a sample pulse from a clock signal extracted from the received signal, separates the main data and the sample value from the received signal, A transmission system characterized in that a sawtooth wave is generated from a sample pulse and the sample value, and a signal starting from the rising edge of the generated sawtooth wave is output as an auxiliary output signal.   2. The transmission system according to claim 1, further comprising a GPS receiver for receiving a signal transmitted from a GPS satellite, wherein the auxiliary input signal is a 1 pps auxiliary input signal generated from the received signal. And transmission system. A transmission device of a system for transmitting main data via a transmission line,
The digital audio input data that is the main data and an auxiliary input signal that is asynchronous with the system are input, a sample pulse is generated from the input clock of the digital audio input data, and a saw that starts from the rise of the auxiliary input signal A transmitting apparatus, comprising: generating a wave, generating a sample value of the sawtooth wave for each sample pulse, and multiplexing the sample value with the main data. 4. The transmission apparatus according to claim 3, further comprising a GPS receiver for receiving a signal transmitted from a GPS satellite, wherein the auxiliary input signal is a 1 pps auxiliary input signal generated from the received signal. A transmitting device . A receiving device that receives a signal transmitted from the transmitting device according to claim 3 or 4,
A sample pulse is generated from a clock signal extracted from the received signal, the main data and the sample value are separated from the received signal, a sawtooth wave is generated from the sample pulse and the sample value, and the generated saw is generated. A receiver that outputs a signal starting from the rising of a wave as an auxiliary output signal.

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