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There is provided a counter circuit operable in synchronism with a frame of a digital data signal of a digital audio system even if a frame synchronization signal is not detected. The counter circuit comprises a detection circuit for detecting the frame synchronization signal of the digital data sig

There is provided a counter circuit operable in synchronism with a frame of a digital data signal of a digital audio system even if a frame synchronization signal is not detected. The counter circuit comprises a detection circuit for detecting the frame synchronization signal of the digital data signal to produce a frame synchronization detection signal. A series of counters repeatedly count clock pulses reproduced from the digital data signal to produce a count signal when the count of the series of counters reaches a value corresponding to the number of channel bits includes in one (1) frame of the digital data signal. A reproduction frame sychronization signal is generated in response to the frame synchronization signal when the count of the series of counters is within a predetermined range, the reproduction frame synchronization signal resetting the counters. The reproduction frame synchronization signal is also generated in response to the count signal when the count of the series of counters is within the predetermined range and when the frame synchronization detection signal is not outputted from the frame synchronization signal detection circuit, the reproduction frame synchronization signal resetting the counters.

대표청구항 ▼

A counter circuit operable in synchronism with a frame of a digital data signal in a digital audio system, the frame being composed of a predetermined number of channel bits, said counter circuit comprising: (a) frame synchronization detecting means for detecting a frame synchronization signal conta

A counter circuit operable in synchronism with a frame of a digital data signal in a digital audio system, the frame being composed of a predetermined number of channel bits, said counter circuit comprising: (a) frame synchronization detecting means for detecting a frame synchronization signal contained in the digital data signal to produce a frame synchronization detection signal; (b) counter means for counting reproduction clock pulses reproduced from the digital data signal to produce a count signal when the count of said counter means reaches a value corresponding to the predetermined number of channel bits, wherein each reproduction clock pulse corresponds to a channel bit of the frame; and (c) signal feeding means for feeding a reproduction frame synchronization signal to said counter means for resetting the counter means, said signal feeding means being responsive to said frame synchronization detection signal to output said detection signal as said reproduction frame synchronization signal when the detection signal occurs within a predetermined range of the count of the counter means, and said signal feeding means being responsive to said count signal to output said count signal as said reproduction frame synchronization signal when said frame synchronization detection signal is not outputted from said frame synchronization signal detecting means within said predetermined range.