Pattern detection circuitry
First Claim
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1. A pattern detection circuit, comprising:
- circuitry for detecting a silence pattern in a received bit stream, wherein the circuitry for detecting a silence pattern comprises circuitry for distinguishing between a plurality of predetermined silence patterns; and
circuitry for generating a control signal in response to detection of a silence pattern, wherein the circuitry for generating a control signal comprises circuitry for generating a control signal corresponding to the detected silence pattern from the plurality of predetermined silence patterns.
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Abstract
A pattern detection circuit detects a pattern in a received bit stream, for example a repetitive 8-bit silence pattern in a stream of digital audio data. Summing circuitry forms during first alternate time periods a sum of a first sequence comprising a predetermined number of alternate bits in the bit stream; and forms during second alternate time periods an inverse of a sum of a second sequence comprising the predetermined number of alternate bits in the bit stream. It is then determined whether successive sums formed by the summing circuitry are equal.
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Citations
27 Claims
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1. A pattern detection circuit, comprising:
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circuitry for detecting a silence pattern in a received bit stream, wherein the circuitry for detecting a silence pattern comprises circuitry for distinguishing between a plurality of predetermined silence patterns; and circuitry for generating a control signal in response to detection of a silence pattern, wherein the circuitry for generating a control signal comprises circuitry for generating a control signal corresponding to the detected silence pattern from the plurality of predetermined silence patterns. - View Dependent Claims (2, 3, 4, 5, 6, 8, 14, 15, 16, 17, 18, 26)
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7. An audio reproduction system, comprising:
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a pattern detection circuit, comprising; circuitry for detecting a silence pattern in a received bit stream, wherein the circuitry for detecting a silence pattern comprises circuitry for distinguishing between a plurality of predetermined silence patterns; and circuitry for generating a control signal in response to detection of a silence pattern, wherein the circuitry for generating a control signal comprises circuitry for generating a control signal corresponding to the detected silence pattern from the plurality of predetermined silence patterns, wherein the audio reproduction system is controlled by said control signal, wherein a control signal generated in response to detection of one silence pattern from the plurality of predetermined silence patterns is adapted to cause the audio reproduction system to power down, and wherein first and second control signals generated in response to detection of respective first and second silence patterns from the plurality of predetermined silence patterns are adapted to cause the audio reproduction system to enter respective different standby modes.
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9. An audio reproduction system, comprising:
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a pattern detection circuit, comprising; circuitry for detecting a silence pattern in a received bit stream, wherein the circuitry for detecting a silence pattern comprises circuitry for distinguishing between a plurality of predetermined silence patterns; and circuitry for generating a control signal in response to detection of a silence pattern, wherein the circuitry for generating a control signal comprises circuitry for generating a control signal corresponding to the detected silence pattern from the plurality of predetermined silence patterns; and a playback device, wherein the audio reproduction system is controlled by said control signal, and wherein the playback device is adapted to alter a silence pattern present on a storage medium, in order to transmit signalling information. - View Dependent Claims (10, 11, 12, 13)
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19. A method of controlling an audio reproduction system, the method comprising:
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receiving a bit stream; detecting in the received bit stream a silence pattern from a plurality of predetermined silence patterns; and in response to detection of a silence pattern, generating a control signal that corresponds to the detected silence pattern. - View Dependent Claims (20, 21, 22, 23, 27)
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24. A signal reproduction circuit, comprising:
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an input for receiving an input signal representative of recorded sound, wherein a plurality of bit patterns in the input signal all represent silence in the recorded sound; and a pattern detector, for detecting said bit patterns that represent silence, and for distinguishing between said bit patterns that represent silence; wherein the signal reproduction circuit is controlled in response to a detected bit pattern from said bit patterns that represent silence.
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25. A method of controlling a signal reproduction circuit, the method comprising:
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transmitting signals to a control device, said signals representing recorded sound; including in the transmitted signals at least one signal selected from a plurality of signals that represent silence in the recorded sound; and encoding control information for the signal reproduction circuit in the choice of signal, selected from the plurality of signals that represent silence in the recorded sound, that is included in the transmitted signals.
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Specification