KR19980069397A - Multichannel Voice Multicasting Transmission Processing Unit - Google Patents

Abstract

The present invention enables the multi-channel audio to be transmitted or received in a multi-channel state from a television receiver side by transmitting a voice signal of a voice multi-broadcast according to a television broadcast in a multi-channel state of at least 5 channels. Provides a multicast transmission processing device.

Accordingly, the present invention provides a plurality of channel voice processing means (A1 to An) for receiving voice signals of the first to nth channels and performing voice processing with a limited frequency bandwidth, and the voice signals of the first to nth channels. A plurality of spreading code generating means (B1 to Bn) for generating differential first to nth spreading codes for channel discrimination respectively, and the audio signals of the first to nth channels and the plurality of spreading code generating means ( A plurality of signal multiplying means (C1 to Cn) and a plurality of signal multiplying means (C1 to Cn) that multiply and output the first to nth spreading codes generated from B1 to Bn). Signal synthesizing means 48 for synthesizing audio signals respectively, modulation signal generating means 50 for generating a modulated signal for moving the synthesized voice multicast signal to a frequency band suitable for transmission, and the signal synthesizing means ( 48) the voice multicast signal from And a modulated signal multiplying means 52 which multiplies the modulated signal from the modulated signal generating means 50 and outputs the multiplied signal.

Description

Multichannel Voice Multicasting Transmission Processing Unit

The present invention relates to a multi-channel voice multi-broadcast transmission processing apparatus, and more particularly, in a multi-channel voice multi-broadcast transmission system, a multi-channel voice channel for voice multi-broadcasting is used to transmit and receive multi-language reception and audio output. The present invention relates to a multi-channel voice multicast transmission processing apparatus for enabling multiplexing of voice signals.

In general, a plurality of television stations registered as a transmission company of television broadcasts can transmit a plurality of broadcast channels in the form of over-the-air waves. On the television receiver side, a predetermined channel is selected from among the plurality of broadcast channels for video / audio processing. In order to reproduce the broadcast signal through the video / audio, and to reproduce the output along with the television image through its own audio processing corresponding to the voice transmission method of the audio signal according to the television channel of the tuned channel.

On the other hand, the voice transmission method for the voice signal of the television broadcast is provided with a voice multiplex method, which is a stereo broadcast or bilingual language by simultaneously transmitting another voice signal superimposed on the voice carrier of the television broadcast. A method of adding a second voice carrier in addition to the existing voice carrier while multicasting a subcarrier modulated with a dual carrier system and a negative voice to a conventional voice carrier. In subcarrier system, it can be classified into two-carrier, AM-FM, analog-based by FM-FM and digital by DPSK.

In the multi-carrier method, the multi-carrier method is used in Korea, Germany, and China. In the Korean method, a second voice carrier is dropped by 14.25 fH (ie, fH is 15.7342 KHz) in addition to the existing voice carrier. The pilot signal is transmitted to generate a pilot signal for determining whether the voice signal is multiplied by the audio, and the subcarrier of 3.5 fH is generated as a 50% AM-modulated control signal. It is excellent in left / right separation in the state and excellent in crosstalk and S / N ratio in two languages.

In the voice multiplex method, the AM-FM method (i.e., Zenith method) is adopted in the Americas, such as the United States. In the stereo method, 2fH is a subcarrier and fH is a pilot signal. In Korean broadcasting, a second carrier (5fH) called SAP (Second Audio Program) is transmitted as a second sub-channel modulated by FM, and a noise attenuating circuit is employed to improve the S / N ratio for the second sub-channel. It is supposed to be.

FIG. 1 is a block diagram showing a conventional AM-FM voice multicast transmission processing apparatus. According to the figure, each R voice signal and L voice signal are applied / subtracted for stereo broadcasting. To the first matrix circuit 2, which generates the audio signal of the L + R channel and the audio signal of the LR channel, and the audio signal of the L + R channel from the first matrix circuit 2. Pre-emphasis 4 which emphasizes the high frequency to the high-frequency band, and compression of the signal together with noise attenuation processing according to the dbX noise attenuation standard for noise attenuation of the audio signal of the LR channel from the first matrix circuit 2 A low pass filtering of the L + R channel audio signal and the LR channel audio signal from the dbX encoder 6, the pre-emphasis 4 and the dbX encoder 6, respectively, to the frequency band of 12.5 KHz, respectively. 1 and 2 LPF (8, 10), the low A second matrix circuit 12 for receiving the L + R channel voice signal and the LR channel voice signal and performing matrix processing, respectively, and outputting the L1 and R1 channel voice signals, and the L1 and R1 channel signals. A stereo encoder that receives an audio signal and synthesizes it with a subcarrier signal of 2fH (where fH is a horizontal frequency signal of 15.734KHz) and encodes the L + R channel audio signal of the main channel and the LR channel audio signal of the first subchannel. (14), a subcarrier / pilot generation unit 16 for generating a pilot signal as a recognition signal representing a subcarrier signal and a broadcasting method through a voltage controlled oscillation operation and a PLL operation, and the stereo processed L + R channel; A first adder 18 which adds and outputs an audio signal of the LR channel with a pilot signal of fH, and a third LPF 20 which low-pass filters the added audio signal of the R and L channels into a frequency band of 58 kHz. SAP for National Broadcast (S ecox Audio Program) dbX encoder 22 which receives the signal as the audio signal of the second sub-channel and compresses the signal together with the noise attenuation process according to the standard specification of dbX noise attenuation for noise attenuation, and the encoded SAP signal. A fourth LPF 24 for low pass filtering to a frequency band of 10 KHz, an FM modulator 26 for FM modulating the low pass filtered SAP signal, and a BPF 28 for band pass filtering the FM modulated SAP signal. And a second adder 30 which adds and outputs the audio signal of the R1 / L1 channel through the third LPF 20 and the SAP signal as the subchannel from the BPF 28.

According to the AM-FM type voice multiple broadcast transmission processing apparatus composed of such components, when the R and L voice signals are output as voice signals of the L + R channel and the LR channel by the matrix processing of the first matrix circuit 2, the preamble is free. The L + R channel voice signal with high frequency emphasis through the emphasis 4 is low pass filtered to 12.5 KHz by the first LPF 8, and the LR with noise reduction and signal compression through the dbX encoder 6 is processed. The low-pass filtering of 12.5KHz is performed on the audio signal of the channel through the second LPF 10, and the audio signals of the L + R channel and the LR channel are converted into the L1 channel and the R1 channel by the matrix processing of the second matrix circuit 14. When generated as an audio signal, the stereo encoder 14 is combined with the subcarrier signal from the subcarrier / pilot generation unit 16 to correspond to the audio signal of the L + R channel corresponding to the main channel and the first subchannel. Stereo processing in the form of audio signal of LR channel On the other hand, the first adder is added with the pilot signal from 18 is lowpass filtered by a first 3LPF (20).

At this time, in the dbX encoder 22, the SAP signal of two languages corresponding to the audio signal of the subchannel is subjected to noise attenuation processing and signal compression according to the dbX noise attenuation standard. After the pass filtering is performed, it is finally added to the audio signal of the R1 / L1 channel through the second adder 30 through the FM modulation process by the FM modulator 26 and the band pass filtering operation through the BPF 28. do.

As shown in FIG. 2, the AM-FM voice multicast signal transmitted through the voice encoding process of the voice multicast is L + R of the main channel having a frequency of 50 to 15KHz in the frequency band of 0 to fH. A channel audio signal is carried, a pilot signal as a recognition signal of a broadcasting method having 5KHz at fH, and an LR channel audio signal as a first subchannel having 50-15KHz in the frequency band of fH-3fH. On the other hand, an SAP signal having 50 to 10 KHz as the 22nd sub-channel is loaded on 5fH.

However, in the current voice multiple broadcasting method including the AM-FM method, since two audio signals of three channels having one main channel and two sub-channels are carried on the frequency domain of 6fH, In the case of dual broadcasting, which aims to be a Korean language broadcaster, it provides not only limitations in terms of service of voice multicasting, but also provides a wide range of 6fH bandwidth. There is a drawback that the full utilization of the information is not achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to transmit a voice signal of a voice multi-broadcast according to a television broadcast in a multi-channel state of at least five channels. It is an object of the present invention to provide a multi-channel voice multi-broadcast transmission processing apparatus capable of multi-output.

In order to achieve the above object, according to the multi-channel voice multi-broadcast transmission processing apparatus according to the present invention, a plurality of channel voice processing means for receiving voice signals of the first to n-th channel respectively and performing voice processing with a limited frequency bandwidth And a plurality of spreading code generating means for generating differential first to nth spreading codes for channel discrimination for the voice signals of the voiced first to nth channels, respectively, and through the plurality of channel voice processing means. A plurality of signal multiplying means and a plurality of signal multiplying means for correspondingly multiplying and outputting the voice signals of the voiced first to nth channel and the first to nth spreading codes generated from the plurality of spreading code generating means; A signal synthesizing means for synthesizing the voice signals of the multiple channels multiplied through each other and moving the synthesized voice multicast signal through the signal synthesizing means to a frequency band suitable for transmission Multi-channel voice multi-broadcast transmission comprising modulation signal generating means for generating a modulated signal for raising and multiplying and outputting a multi-signal signal from said signal synthesizing means with a modulation signal from said modulation signal generating means. Provide a processing device.

According to the present invention configured as described above, in the voice multicast transmission processing apparatus for transmitting a voice signal of the voice multiplex method of television broadcasting, at least 5 channels of voice signals are generated to provide a spreading code having differential data contents for each channel. As the data is synthesized with the bit data and transmitted, the spreading code corresponding to the spreading code for each channel synthesized with the sound multicasting signal received from the television receiver is decoded to generate at least 5 channels of the sound multicasting signal. To enable a wide range of playback output.

1 is a block diagram showing a conventional AM-FM voice multicast transmission processing apparatus;

FIG. 2 is a diagram showing a frequency spectrum of an AM-FM type voice multiple signal transmitted by being processed by the voice multiple broadcast transmission processing apparatus of FIG. 1;

3 is a block diagram showing a multi-channel voice multi-broadcast transmission processing apparatus according to the present invention;

4 is a view showing a detailed configuration of the diffusion code generation unit shown in Figure 3 according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

40: LPF, 42: signal source,

44: sampling unit, 46: signal compression unit,

48: signal synthesizing unit, 50: modulated signal generating unit,

52: multiplier, A1 to An: first to nth channel audio processing unit,

B1 to Bn: first to nth diffusion code generation sections, C1 to Cn: first to nth multiplication sections,

D1 to Dn: first to nth shift registers, E1 to En: first to nth amplifiers,

F1-Fn: 1st-nth adder.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing a multi-channel voice multi-broadcast transmission processing apparatus according to the present invention. In the apparatus of the present invention, reference numerals A1 to An denote audio signals of the first to n-th channels having at least 5 channels. The first to n-th channel audio processing unit for receiving quantization through sampling and signal compression by limiting the frequency to 15 kHz to satisfy the input signal protocol according to the FCC's 50 to 15 kHz, respectively.

Here, the first to n-th channel audio processing units A1 to An include an LPF 40 for low-pass filtering the input first to n-th voice signals into a frequency band of 15 KHz, and the low pass filtering. A sampling section 44 for sampling the first to n-th channel audio signals with a 15 kHz frequency signal generated from the signal source 42, and a noise attenuation processing and signal compression so as to be compatible with the dbX noise reduction standard. And a signal compression section 46 for quantizing the sampled first through n-th channel audio signals.

In addition, reference numerals B1 to Bn are discriminated so as to be able to distinguish voice channels, respectively, when decoding the voice signals of the first to nth channels that are voice processed by the first to nth channel voice processing units A1 to An. The first to nth spreading code generators for generating the first to nth spreading codes having binary bit data having data contents are shown.

As shown in FIG. 4, the first to nth spreading code generators B1 to Bn respectively receive binary bit data and perform first shift processing on the first to nth shift registers. The binary bit data shifted from the first to nth shift registers D1 to Dn through D1 to Dn and the first to nth amplifiers E1 to En, respectively, is converted into another output data through a shift operation. Each of the first to nth adders F1 to Fn to add and output to the nth shift register Dn, wherein G (X) = g _m X ^m + g _m-1 X ^M-1 + g ^{_{m-2 X m-2 +}} ··· + g ₀ using the gX + formula (X ⁶⁴ + 1) of the can be provided a spreading code based on user data of an individual user.

Further, the first to nth spreading code generators B1 to Bn each use a spreading code for data having binary bit data having values of 0 and 1 mapped to +1 and -1, respectively. In case of using K-stage shift register, if there is 2 ^K-1 channel chip, and 5 or 6 channel voice signal is needed, K = 3 is required. When the first to n-th audio signals of the signal each have a bandwidth of 5 fH, a total of five bits are generated per sample of the audio signal.

Further, reference numerals C1 to Cn denote first to nth diffusion code generators B1 for the audio signals of the first to nth channels that have been voice processed through the first to nth channel audio processing units A1 to An, respectively. The first to nth multipliers respectively multiplied by the first to nth diffusion codes generated from -Bn) are output.

Reference numeral 48 denotes a signal synthesizing unit for synthesizing and outputting the audio signals of the first to nth channels from the first to nth multiplication units C1 to Cn as audio multiple broadcast signals.

Further, reference numeral 50 denotes a modulated signal for generating an AM or QPSK modulated signal to move the voice multicast signal having the synthesized first to nth channels to a band of 4.5 MHz corresponding to a voice signal band. The generator 52 denotes a multiplier for multiplying the audio multi-broadcast signal from the signal synthesizer 48 with the modulated signal generated from the modulated signal generator 50 to synthesize the video signal of the television broadcast. .

Next, the operation of the present invention made as described above will be described in detail with reference to the drawings.

First, in the case of generating and transmitting a voice signal of five channels for a voice broadcasting service of five languages according to voice multiple broadcasting, the first to fifth channel voice signals are first to fifth channel voice processing units (A1). The LPF 40 of the first to fifth channel audio processing units A1 to A5 performs low pass filtering on the first to fifth channel audio signals in a frequency band of 15 KHz. In the sampling section 44, the low-pass filtered first through fifth channel audio signals are sampled by the 15 KHz frequency signal from the signal generator 42, while the signal compression section 46 The audio signals of the sampled first to fifth channels are subjected to the noise attenuation operation and the signal compression operation according to the dbX noise attenuation standard.

At this time, the first to third shift registers D1 to D3 of the first to fifth diffusion code generation units B1 to B5 corresponding to the first to fifth channel audio processing units A1 to A5 are input. Binary bit data is shifted sequentially, and the first and second adders F1 and F2 shift the first to third shift registers D1 to D3 through the first and second amplifiers E1 and E2. The shifted binary bit data are added to each other and applied to the third shift register D3, thereby generating a spreading code having a number of five bits for channel discrimination for the voice signals of the first to fifth channels. do.

On the other hand, the first to fifth multipliers C1 to C5 respectively spread the first to fifth channels of the first to fifth channel audio signals from the first to fifth channel voice processing units A1 to A5. The signal generator 48 multiplies the spreading codes from the code generators B1 to B5 and outputs the multiplied signals. It is output as a broadcast signal.

Next, the multiplier 52 receives an AM or QPSK modulated signal for shifting from the modulated signal generator 50 to the 4.5 MHz voice signal band and synthesized by the signal synthesizer 48. By multiplying the voice multicast signal, the voice multicast signal is shifted to a band of 4.5 MHz so that the voice multicast signal is superimposed with a video signal according to a later television broadcast to be transmitted in an airwave form.

Accordingly, the television receiver that receives and reproduces the television broadcast signal, when decoding the voice multiple broadcast signal, spreads corresponding to the spread codes generated from the first to fifth spreading code generators B1 to B5, respectively. As the code is generated to distinguish each voice channel, the five-channel audio signal having the five-language broadcasting can be widely reproduced and output.

According to the present invention made as described above, at the time of the transmission of the voice multi-broadcast signal according to the television broadcast, it is possible to generate a multi-channel voice signal of at least 5 channels and synthesized with the spreading code generated for each channel discrimination As a result, more than five channels of audio can be reproduced and outputted on the receiving side, and thus, the broadcasting function of the television broadcast can be improved and the viewing effect can be maximized.

Claims (5)

A plurality of channel voice processing means (A1 to An) for receiving voice signals of the first to nth channels, respectively, and performing voice processing with a limited frequency bandwidth; A plurality of spreading code generating means (B1 to Bn) for generating differential first to nth spreading codes for channel discrimination for the speech signals of the speech processed first to nth channels, respectively; The first to nth audio signals processed through the plurality of channel audio processing means (A1 to An) and the first to nth spreading codes generated from the plurality of spreading code generating means (B1 to Bn) are used. A plurality of signal multiplying means C1 to Cn to multiply and output correspondingly; Signal synthesizing means 48 for synthesizing the audio signals of the multiple channels multiplied by the plurality of signal multiplication means C1 to Cn, respectively, Modulation signal generating means (50) for generating a modulation signal for moving the synthesized voice multi-broadcast signal to a frequency band suitable for transmission through the signal synthesizing means (48); Multi-channel voice multi-broadcast transmission comprising a modulated signal multiplying means (52) which multiplies the voice multi-broadcast signal from the signal synthesizing means (48) with the modulated signal from the modulated signal generating means (50). Processing unit. 2. The apparatus of claim 1, wherein the plurality of channel voice processing means (A1 to An) are LPFs (40) for low pass filtering the voice signals of the first to nth channels in a frequency band of 15 kHz, respectively, and the low pass filtering. A sampling section 44 for sampling the first to n-th channel audio signals based on a frequency of 15 kHz from the signal source 42, and noise attenuation for the sampled first to n-th audio signals. And a signal compression unit (46) for performing quantization through operation and signal compression. 2. The apparatus according to claim 1, wherein the plurality of spreading code generating means (B1 to Bn) comprises first to nth shift registers (D1 to Dn) for shift processing binary bit data, and first to nth amplifiers (E1). And first to nth adders F1 to Fn respectively adding binary bit data through ˜En) to output data of binary bits according to the shift result and outputting the binary bit data to the nth shift register Dn. Multi-channel voice multicast transmission processing device, characterized in that. 3. The method according to claim 1 or 2, wherein the plurality of spreading code generating means (B1 to Bn) generate five bits when each channel voice signal of the voice multiple broadcast signal has a bandwidth of 5fH. Multi-channel voice multicast transmission processing device characterized in that. The multi-channel voice multi-broadcast transmission processing apparatus according to claim 1, wherein said modulation signal generating means (50) generates a modulated signal for moving said voice multi-broadcast signal to a voice signal band of 4.5 MHz.