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Digital signal routing circuit

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Digital signal routing circuit


An integrated circuit for digital signal routing. Signal routing is achieved by means of a multiply-accumulate block, which takes data from one or more data source and, after any required scaling, generates output data for a data destination. The multiply-accumulate block operates on a time division multiplexed basis, so that multiple signal paths can be processed within one period of the sample clock. Each signal path has a respective sample clock rate, and paths with different sample clock rates can be routed through the multiply-accumulate block on a time division multiplexed basis independently of each other. Thus, speech signals at 8 kHz or 16 kHz can be processed concurrently with audio data at 44 kHz or 48 kHz.

Inventors: Graeme Gordon Mackay, Jonathan Timothy Wigner, Gordon Richard McLeod
USPTO Applicaton #: #20120300960 - Class: 381119 (USPTO) - 11/29/12 - Class 381 
Electrical Audio Signal Processing Systems And Devices > With Mixer

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The Patent Description & Claims data below is from USPTO Patent Application 20120300960, Digital signal routing circuit.

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This application claims the benefit of U.S. Provisional Application No. 61/491,041, filed May 27, 2011, the entire disclosure of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a signal routing circuit, and in particular to a signal routing circuit that can be used as a digital audio hub, for interconnecting various signal sources and signal destinations in consumer devices, of which smartphones are just one example.

2. Description of the Related Art

It is known to provide an integrated circuit that acts as an “audio hub”, which is able to receive a number of signals from analog and digital sources, converting the analog signals to digital signals and then combining or processing the signals in the digital domain, in order to generate output signals. If required, the output signals can be converted by the audio hub into analog signals, in order to be applied to analog transducers such as headphones or speakers. Such a digital audio hub device can be incorporated into a consumer device, such as a smartphone or the like, allowing the received signals to be processed in predetermined ways.

It is desirable to allow the customer of the “audio hub” integrated circuit to use it to interconnect a number of different signal processing components within a consumer device in a flexible manner, without being restricted to specific external devices or to specific processing paths.

The invention is defined by the claims appended hereto.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention, and to show how it may be out into effect, reference will now be made, by way of example, to the accompanying drawings, in which:—

FIG. 1 shows a mobile telephone and various peripheral devices;

FIG. 2a shows components of the audio processing circuitry in the mobile telephone of FIG. 1;

FIG. 2b shows components of the audio processing circuitry in an alternative mobile telephone;

FIG. 3 is a first more detailed block diagram, showing the form of the audio hub routing circuitry in the audio processing circuitry of FIG. 2a or 2b;

FIG. 4 is a still more detailed block diagram, showing the form of the pre-conditioning circuitry in the routing circuitry of FIG. 3;

FIG. 5 is a further still more detailed block diagram, showing the form of the switching circuitry in the routing circuitry of FIG. 3;

FIG. 6 is a further still more detailed block diagram, showing an alternative form of the switching circuitry in the routing circuitry of FIG. 3;

FIG. 7 is a further still more detailed block diagram, showing the form of the down-sampling circuitry in the routing circuitry of FIG. 3;

FIG. 8 is a further still more detailed block diagram, showing the form of the up-sampling circuitry in the routing circuitry of FIG. 3;

FIG. 9 is a further still more detailed block diagram, showing the form of the post-conditioning circuitry in the routing circuitry of FIG. 3;

FIG. 10 is a further still more detailed block diagram, showing the form of the digital mixing core in the routing circuitry of FIG. 3;

FIG. 11 shows in more detail a part of a functional block in the digital mixing core of FIG. 10;

FIG. 12 shows in more detail a part of another functional block in the digital mixing core of FIG. 10;



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Industry Class:
Electrical audio signal processing systems and devices
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stats Patent Info
Application #
US 20120300960 A1
Publish Date
11/29/2012
Document #
13481403
File Date
05/25/2012
USPTO Class
381119
Other USPTO Classes
International Class
04B1/00
Drawings
62



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