Time filter

Source Type

A method for conversion of a n-channel audio signal (L, R, Ls, Rs) into a two-channel audio signal (Ro, Lo), where n4 and integer, includes the step of generating either one of the two-channel audio signals, right (Ro) or left (Lo), by a combination of: a front (R, L) and rear (Rs, Ls) signal components of the n-channel audio signal of the same side (right or left), and a front (L, R) signal component of the n-channel audio signal of the other side (left or right), and a term dependent of n.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2013-03-05

A method for down-mixing of a m-channel audio signal (L, R, C, Ls, Rs, Rss, Lss) into a n-channel audio signal (Ro, Lo, Rso, Lso), where m is an integer for which holds m>n and n is an integer for which holds n2, including the step of generating one of the n-channel audio signals of one side (right or left) of a listener (Ro, Lo, Rso, Lso), by a combination of: a first term including a signal component (R, L, Rs, Ls) of the m-channel audio signal of the same side only, and a second term dependent of m, including one or more of further signal components of the m-channel audio signal (C, Ls, Rs, Rss, Lss) of the same side only, multiplied by at least one respective filtering function (H1, H2, H3, H4, H5, H6, H7, H8), said filtering function being dependent on: a frequency characteristic of the transmission path between the position of the loudspeaker of the respective signal component of the further m-channel audio signal, and a position of the right ear or left ear, respectively, of a listener in an m-channel reproduction situation, and a frequency characteristic of the transmission path between the position of a loudspeaker of the said one of the n-channel audio down-mixed signals, (Ro, Lo, Rso, Lso), and a position of the right ear or left ear, respectively, of a listener in an n-channel reproduction situation.


An arrangement (102, 100) for monitoring the operation of a transmitter antenna system (112). The transmitter antenna system is adapted for the emission of one or more information signals (M1.1, M2.1, M3.1, M4.1). The arrangement for monitoring is provided with a retrieval arrangement (102) for retrieving a first detection signal which is a measure for the reflection signal in the transmitter antenna system. According to the invention, the arrangement for monitoring is further provided with a detection arrangement (100) which is adapted to establish whether, in the frequency characteristic of the first detection signal, frequency components that are different from the one or more information signals (M1.1, M2.1, M3.1, M4.1) are present in the first detection signal and to generate a second detection signal if this is the case. This way, the occurrence of an arc in a transmitter antenna system can be reliably established.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2013-03-26

In order to realize a correction for changes in the reproduction loudness at low frequencies in a downmix-arrangement, a mixing arrangement is proposed for mixing at least two audio signals, which mixing arrangement is provided with a first unit (104) for deriving a first power signal, which is a measure for the power of the first audio signal, a second unit (105) for deriving a second power signal, which is a measure for the power of the second audio signal, a cross-correlation unit (103) for deriving a cross-correlation signal, which is a measure for a cross-correlation between the first and the second audio signal, a unit (106) for deriving multiplication parameters from the first and second power signals and the cross-correlation signal, and a multiplication and combination unit (107) for carrying out a signal processing on the first and second audio signals and combining them. The unit (106) for deriving the multiplication parameters is provided with a combination unit (110) for deriving a combination signal which is a measure for a combination of the first and second power signals and the cross-correlation signal, and is provided with a scaling unit (109) for scaling one of the signals in the unit for deriving the multiplication parameters with a scaling signal. The scaling signal (D[k]) has a frequency characteristic which is a substantially constant below a first frequency value (kL), is increasing between the first frequency value (kL) and a second higher frequency value (kU) and is again substantially constant above the second frequency value. The unit (106) for deriving the multiplication parameters is further adapted to derive a single multiplication parameter m[k]) from the combination signal, and the multiplications and combination unit (107) is adapted to carry out a signal processing on the first and second audio signals which is equivalent to multiplying the first and second audio signals with this single multiplication parameter, and combining the so multiplied first and second audio signals.


A commentator or simultaneous translator system is provided with an audio mixing console, a command intercom and an operating unit. The operating unit is provided with a circuitry. The operating unit is implemented in such a way that a simplified operation of the commentator or simultaneous translator system is provided.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2014-03-05

A transmission arrangement includes a main transmitter (100) for transmitting a first broadcast transmission signal in a reception area (104), and a receiver apparatus (106) adapted to receive the first broadcast transmission signal (102) and to transmit a second broadcast transmission signal (110) in response to the reception of the first broadcast transmission signal. The first broadcast transmission signal (102) includes subsequent first information packets (IP_(MT)1, IP_(MT)2, IP_(MT)3, . . . ) with subsequent first information packets (IP_(MT)i) having at least two subsequent information blocks (IB_(MT)i.1, IB_(MT)i.2) having substantially the same information. The second broadcast transmission signal includes subsequent second information packets (IP_(RS)1, IP_(RS)2, IP_(RS)3, . . . ) with subsequent second information packets (IP_(RS)i) having at least one information block (IB_(RS)i). The second information packets (IP_(RS)i) of the second broadcast transmission signal (110) are of substantially the same length in time as the first information packets (IP_(MT)i) of the first broadcast transmission signal and the information blocks (IB_(RS)i) of the second information packets are of substantially the same length in time as the information blocks (IB_(MT )i,j) of the first information packets. The receiver apparatus (106) is further adapted to transmit the second broadcast transmission signal such in time, that the formation blocks (IB_(MT)i.2,IB_(MT )i+1.2, . . . ) in the first information packets in the first broadcast transmission signal are correlated in time with the at least first information blocks (IB_(RS )i,IB_(RS )i+1, . . . ) in the second information packets in the second broadcast transmission signal. This results in an increase of the reception area of the main transmitter by the reception area of the receiver apparatus.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2014-11-27

FDM based broadcast transmitter arrangement for transmitting a digital audio/video information signal, wherein an encoded version of the digital audio/video information signal is encapsulated in a network layer encapsulation step in accordance with DAB, DVB-T or DVB-T2 to obtain a network layer information signal. The network layer information signal is then converted in a Data Link Layer conversion step to obtain a Data Link Layer information signal, which is subjected in a Physical Layer conversion step to obtain a broadcast information transmission signal.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2013-06-18

A sub-band splitter unit for splitting a broadband input signal (G1), e.g., an audio signal, in K narrowband sub-band signals (L1, . . . , Lk, . . . . , LK), wherein K is an integer larger than 1, which sub-band splitter unit (100) is provided with an input terminal (100) for receiving the broadband input signal and K1 sub-band filter circuits (SBF1, . . . , SBFk, . . . , SBFK1), each of the sub-band filter circuits (SBFk) is provided with an input (103.k) and a first (104.k) and a second output (105.k), a first filter arrangement (LPFk) coupled between the input (103.k) and the first output (104.k), a second filter arrangement (HPFk) coupled between the input (103.k) and the second output (105.k), and the sub-band splitter unit is provided with K output terminals (102.1, . . . , 102.k, . . . , 102.K) for supplying the K sub-band signals. The first output (104.k) of a k-th sub-band filter circuit (SBFk) is coupled to an input (103.k+1) of the (k+1)-th sub-band filter circuit. The input (103.1) of the first sub-band filter circuit (SBF1) is coupled to the input (101) of the sub-band splitter unit. The second output (105.k) of a k-th sub-band filter circuit is coupled to the k-th output (102.k) of the sub-band splitter unit.


Patent
Institute FUR RUNDFUNKTECHNIK GMBH | Date: 2013-06-18

A dynamic range compressor of the subband type for carrying out a dynamic compression on a broadband input signal includes a subband splitting device (102) for splitting the broadband input signal into K narrowband subband signals (SSB1, . . . SSBk, . . . , SSBK), where K is an integer larger than 1. An amplifier unit (104) is provided for amplifying each of the K subband signals by a respective amplification factor (A1, . . . AK) to obtain K amplified subband signals. Further, a subband combining device (105) is provided for combining the K amplified subband signals to obtain a broadband output signal, which is a dynamically compressed version of the broadband input signal. An envelope detecting device (107) is provided for generating, for each of the K subbands, a respective one of K envelope signals. An amplifier control device (110) is provided for generating, in dependence of the K envelope signals, K amplifier control signals, each of the K amplifier control signals being representative of one of the K amplification factors. The amplifier control device (110) is adapted to generate an amplification control signal in dependence of more than one of the K envelope signals.


An information-signal (e.g., video-stream of certain quality) (SB1.1, SB1.2, SB1.3, . . . ) is split into two or more (Multicast-) sub-data-streams and transmitted via different channels (CH1,CH2). Thereby, on switching over of two information-signals, seamlessly switch over to another information-signal (e.g., from SD to HD quality) is enabled (in particular at the GOP-boundary in case of video).

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