TH128107A - Equipment and methods for processing audio signals - Google Patents

Abstract

DC60 (09/05/56) Audio signal processing unit is provided. The unit incorporates a first configurable audio signal processor (110) to process the audio signal (s0) to conform to different configurations (conf) to obtain a processed audio signal (s1), where the unit is optimized so that different configurations (conf) affect different sampling rates (sr1) of the processed audio signal (s1). The unit also incorporates n analysis filter sets (120) with the first number (c1) of analysis filter set channels, one synthesis filter set (130) with the second number (c2) of synthesis filter set channels, a second audio processor (140) to be optimized to receive and process the audio signal (s2) with a predefined sampling rate (sr2), and a controller (150) to control the first number (c1) of analysis filter set channels or the second number (c2) of synthesis filter set channels. In accordance with the configuration (conf), the audio signal processing unit is provided. The unit includes a first audio signal processor capable of being configured (110) to process the audio signal (s0) in accordance with different configurations (conf) to obtain a processed audio signal (s1), which is optimized so that different configurations (conf) affect different sampling rates (sr) of the processed audio signal (s1). The unit also includes an analysis filter set (120) with the first (c1) number of analysis filter set channels, a synthesis filter set (130) with the second (c2) number of synthesis filter set channels, a second audio processor (140) which is optimized to process the audio signal (s2) with a predefined sampling rate (sr2), and a controller (150) to control the first (c1) number of analysis filter set channels or the second (c2) number of synthesis filter set channels in accordance with the configuration (conf).

Claims (13)

------11/06/2561------(OCR) Page 1 of 4 pages. Claims. 1. Audio signal processing unit, which includes a first configurable audio signal processor (110) to process the input audio signal (S0) according to different configurations (conf) to produce a processed audio signal (S1), which is optimized so that different configurations (conf) affect different sampling rates (sr1) of the processed audio signal (S1); an analysis filter set (120) optimized to receive the processed audio signal as the analysis filter input, in which the analysis filter set consists of one analysis filter set channel; a synthesis filter set (130) optimized to receive the output signal from the analysis filter set, in which the synthesis filter set consists of two synthesis filter set channels to produce the resulting audio signal; and a second audio processor (140) optimized to receive and process the resulting audio signal, which consists of predefined sampling rates to produce the signal. The resulting digital output and controller (150) control the first number (C1) of the analysis filter set channel in accordance with the configuration (conf) provided to the first configurable audio signal processor (110), so that the resulting audio output signal (S2) of the synthesis filter set (130) is composed of either a preset sampling rate (sr2) or a sampling rate (sr2') different from the preset sampling rate (sr2) and closer to the preset sampling rate (sr2) than the sampling rate (sr1) of the analysis filter set input signal (S1) to which the unit is optimized to accept such configuration at runtime. 2. An instrument under claim 1 in which the analysis filter set (120) is optimized to convert the analysis filter set input signal (S1) represented in the time domain into an audio signal in the first time-frequency domain (conf) consisting of a number of first sub-band signals, in which the number of first sub-band signals is equal to the first number (c1) of the analysis filter set channels, in which the instrument is further incorporated with a modulator (125) optimized to produce an audio signal in the second time-frequency domain consisting of a number of second sub-band signals from the first time-frequency domain audio signal based on the configuration (conf) such that the number of second sub-band signals of the second time-frequency domain audio signal is equal to the first number (C2) of the synthesis filter set channels, and in which the number of second sub-band signals of the second time-frequency domain audio signal differs from The number of signals in the subband of the time-frequency first domain audio signal and where the synthesizing filter set (130) is optimized to convert the time-frequency second domain audio signal into a time-domain audio signal as the audio signal output (S2) of the synthesizing filter set (130). 3. An instrument under claim 2 in which the modulator (125) is optimized for producing a second time-frequency domain audio signal by producing at least one additional subband signal. 4. An instrument under claim 3 in which the modulator (125) is optimized to produce at least one additional sub-band signal by performing a spectral repeat operation to produce at least one additional sub-band signal. 5. An instrument under claim 3 or 4 in which the modulator (125) is optimized to produce a zero signal which is an additional subband signal. 6. An instrument pursuant to claim 1 or 2 where the analytical filter set is the QMF analytical filter set and where the synthesis filter set is the QMF synthesis filter set. 7. An instrument pursuant to claim 1 or 2 where the analytical filter set is the MDCT analytical filter set and where the synthesis filter set is the MDCT synthesis filter set. 8. An instrument under one of the preceding claims in which the instrument is incorporated with an additional re-sampling (170) optimized to receive a synthesized filter set output signal (S2) incorporated with the first synthesized sampling rate, and in which the additional re-sampling re-sampling of the synthesized filter set output signal to produce a re-sampled output signal incorporated with the second synthesized sampling rate. Page 3 of 4 pages. 9. An instrument pursuant to any of the claims 1 through 7, which is optimized to feed a synthesized filter set output signal incorporating the first synthesized sampling rate into the analysis filter set as the analysis filter set input signal. 10. An instrument pursuant to one of the preceding claims in which the controller is optimized to determine the first (c1) number of analysis filter channels or the second (c2) number of synthesis filter channels based on the acceptable error (e). 11. An instrument under claim 10 in which the controller includes an error comparator (1050) for comparing the true error (e’) with the acceptable error (e). 12. A surround sound mixer incorporating a set of analysis filters (910) to convert the down-mixed time-domain signal (s1) into a time-frequency domain to produce a number of down-mixed sub-band signals (s11, s12, s13); at least two up-mixing units (921, 922, 923) to mix the sub-band audio signal to produce a number of surround sound sub-band signals; at least two modulator units (931, 932, 933, 934, 935) to adjust the number of surround sound sub-band signals, where at least two modulator units (931, 932, 933, 934, 935) are optimized to receive a number one input surround sound sub-band signal, where at least two modulator units are optimized to output a number two output surround sound sub-band signal, and where the number of sub-band signals The number of input surround sound subbands in the first number and the number of output surround sound subband signals in the second number are different. A number of synthesizing filter units (941, 942, 943, 944, 945) convert the output surround sound subband signals from the time-frequency domain to the time domain to obtain the time-domain surround sound output signals (s21, s22, s23, s24, s25), and page 4 of 4 pages, the controller (950) is optimized for accepting the configuration (conf) and is optimized for controlling the number of channels of the analysis filter unit (910) and for controlling the number of input surround sound subband signals in the first number of the modulator units (931, 932, 933, 934, 935) based on the configuration. A configuration (conf) is formed where at least one set of analysis filters, at least two mixing units, at least two modulation units, a number of synthesis filters, and a controller are incorporated with a hardware implementation where the instrument is optimized to accept such configuration at runtime. 13. A method for processing audio signals that includes processing the input audio signal conforming to different configurations, which are received at runtime, to obtain a first-processed audio signal so that the different configurations affect the different sampling rates of the first-processed audio signal; feeding the first-processed audio signal into an analysis filter set; receiving the output from the analysis filter set into a synthesis filter set to obtain the resulting audio signal; controlling the first number of analysis filter channel of the analysis filter set conforming to a configuration so that the audio signal output by the synthesis filter set incorporates either a sampling rate different from the preset sampling rate and closer to the preset sampling rate than the sampling rate of the first-processed input audio signal; and processing the resulting audio output signal incorporated with a preset sampling rate to produce the resulting digital output signal. ------------ 1. An audio signal processor that includes a configurable first-processor(110) to process audio signals(s) conforming to different configurations(conf) to obtain a first-processed audio signal. The processed audio signal (s1) is optimized so that different configurations (conf) will affect different sampling rates (Sr1) of the processed audio signal (S1). The analysis filter set (120) has the first number (c1) of the analysis filter set channels. The synthesis filter set (130) has the second number (c2) of the synthesis filter set channels. A second audio processor (140) is optimized to process the audio signal (s2) with a predefined sampling rate (sr2), and a controller (150) controls the first number (c1) of the analysis filter set channels and the second number (c2) of the synthesis filter set channels, in accordance with the configurations (conf) provided on the first configurable signal processor (110) so that the audio signal output (s2) of the synthesis filter set (140) will have a predefined sampling rate (sr2) or a different sampling rate (sr2). The preset sampling rate (sr) will be closer to the predetermined sampling rate (sr2) than the sampling rate (sr1) of the analysis filter input signal (s1).