摘要:
The present invention provides an apparatus and a method that judge whether contents recording processing is in progress and make it possible to execute reproduction processing under accurate control. A recording control process for executing contents recording processing generates reproduction synchronization management information having a reproduction synchronization management information name, which is uniquely decided from a reproduction management information name of reproduction management information, and stores the reproduction synchronization management information in a directory that is automatically erased at the time of system startup or a volatile memory that is erased at the time of power off. A reproduction control process extracts reproduction synchronization management information on the basis of a reproduction management information name and judges whether contents to be reproduced are being recorded to execute control of a reproduction process. At the time of restart after power supply interruption, the reproduction synchronization management information is reset, and the reproduction control process is prevented from performing control misunderstanding that contents are being recorded simultaneously.
摘要:
A coefficient data transfer processing method for a digital signal processor which has a coefficient address pointer independent of a program counter, whereby a processing program and coefficient data are transferred and supplied from a microcomputer determination, whether an instruction is a read instruction of the coefficient data to execute a read cycle steal or with is made; a value of a program counter with is made; when it is the read instruction, new coefficient data is transferred from the microcomputer to a transfer buffer at an instruction read stage and instruction decode stage in a processing unit; and the coefficient data stored in the transfer buffer is written into a coefficient data memory by the read cycle steal at an execute stage in the same processing unit.
摘要:
This invention manages temporary storage of content data according to guidelines. According to this invention, when temporary storage of a recording transport stream TS3 which is allowed to be temporarily stored in a recording medium so as to be reproducible only within a temporary storage allowable time is managed, a reproducible start point indicating a start point from which the recording transport stream TS3 can be reproduced is associated with a first time stamp out of the time stamps of the GOPs of the recording transport stream TS3, and every time when a period from a time stamp associated with the reproducible start point to the current time reaches a temporary storage allowable time, the reproducible start point is re-associated to another time stamp following the time stamp, so that an overtime part of the recording transport stream TS3 can be removed from a reproducible range so as to easily and correctly disable its reproduction, thus being capable of easily and correctly managing the temporary storage of the recording transport stream TS3.
摘要:
A digital signal processor (DSP) comprises a condition flag register directly accessible by the control microcomputer. Referring to a condition flag of the condition flag register every sampling period of the DSP, the DSP can change the content of a process every sampling period in accordance with the set status of the condition flag. The DSP sets the condition flag in the condition flag register at the beginning of a sampling period of the DSP by a set instruction, and resets the condition flag at the end of a sampling period by a reset instruction. The DSP may be modified to automatically reset the condition flag at the end of the sampling period in which the condition flag has been set.
摘要:
An audio signal data processing system comprises input device for sequentially supplying an audio signal data, data memory control device for writing the audio signal data into a data memory and reading-out the data from the data memory, delay memory control device for sequentially reading-out the audio signal data from the data memory and storing the data into a location of a delay memory indicated by a writing address and for reading-out the audio signal data from a location of the delay memory indicated by a reading address and writing the data into the data memory, address designating devices for designating the writing and reading addresses, arithmetic device for multiplying a predetermined coefficient data to the audio signal data having been read-out by the delay memory control device and written into the data memory, and output device for providing the audio signal data in accordance with a result of operation by the arithmetic device. The data memory control device and the delay memory control device write and read the audio signal data into and from the data memory through data buses independent from each other.
摘要:
A digital signal processor (DSP) makes a conditional judgment based on a value held in a flag register in accordance with the result of an arithmetic operation, selectively outputs data representing either a predetermined value or "0" in accordance with the result of the decision, adds the value of the output data to a value held in a coefficient memory address register, and holds the resultant value in the address register. Accordingly, in executing pipeline processing, a read address of the coefficient data memory can be directly designated without altering the flow of a program, thus shortening the processing speed and facilitating the programming.
摘要:
An audio signal data processing system includes first and second processing devices for processing audio signal data, the first and second processing device having input and output ports of at least two channels, and a control device for controlling the operation of the first and second processing device. The input audio signal data is supplied to the input port of one channel of each of the first and second processing devices, and output data from the output port of said one channel of said first processing device is supplied to the input port of the other channel of the second processing device, and output audio signl data are obtained at each output port of both channels of the second processing device. With this arrangement, one of the cascade processing and the parallel processing can be selectively performed without using a change-over switch provided outside the system.
摘要:
An audio signal data processing system comprises an input device sequentially supplying incoming audio signal data, a data memory control device writing and reading-out the audio signal data into and from a data memory, a delay memory control device sequentially reading-out the audio signal data from the data memory and storing the data into a delay memory and sequentially reading-out the audio signal data from the delay memory and writing the data into the data memory, an arithmetic device multiplying predetermined coefficient data by the audio signal data having been read-out by the delay memory control device and written into the data memory and summing up results of the multiplication. The arithmetic device includes a plurality of multiplication and summing devices multiplying coefficient data by the audio signal data for each of data groups which are obtained by grouping a predetermined number of the audio signal data read-out by the reading device sequentially in the order of reading and subsequently summing up the multiplied values, and a filter device for executing a filter characteristic operation for calculated values respectively obtained by each of the multiplying and summing device, wherein a filter characteristic of the filtering device is made adjustable.
摘要:
A digital signal processor (DSP) computes logarithmic values for data values of the input signal by using an approximation formula expanded into power series. To reduce the number of computing steps, the processor includes a shift circuit for shifting an input data value into a predetermined range of numeric values, a high-order coefficient memory for storing coefficient values of high order coefficients other than a zero-order coefficient of the approximation formula for data values within the predetermined range of numeric values, a zero-order coefficient memory for storing a coefficient value of the zero-order coefficient shifted according to the number of digits shifted by the shift circuit, and an address specifying circuit for specifying a reading address of the zero-order memory corresponding to the number of digit shifted by the shifted circuit. Also, a DSP computes an inverse logarithmic value of a data value of the input signal by using an approximation formula expanded into power series. The processor includes a summing circuit for summing a specific value to an input data value so that a summed value falls within a predetermined range of numeric values, a coefficient memory for storing coefficient values of the approximation formula for data values within the predetermined range of numeric values, and a shift circuit for shifting a result of computation performed by using the approximation formula by a number of digits corresponding to the specific value summed by the summing circuit.
摘要:
A digital signal processing device for outputting a holding data in an output register from a DSP in synchronism with a second clock pulse having a frequency lower than that of a first clock pulse for conducting arithmetic processing in the DSP. Accordingly, data to be output from the DSP can be directly read by a microcomputer, and contents in a coefficient memory and a delay time memory, for example, can be updated in accordance with the read data. Further, the digital signal processing device can be applied to an audio apparatus such as a loudness controller and a spectrum indicating apparatus.